1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
|
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/xhtml;charset=UTF-8"/>
<meta http-equiv="X-UA-Compatible" content="IE=9"/>
<meta name="generator" content="Doxygen 1.9.1"/>
<meta name="viewport" content="width=device-width, initial-scale=1"/>
<title>HDF5: Metadata Cache</title>
<link href="tabs.css" rel="stylesheet" type="text/css"/>
<script type="text/javascript" src="jquery.js"></script>
<script type="text/javascript" src="dynsections.js"></script>
<link href="navtree.css" rel="stylesheet" type="text/css"/>
<script type="text/javascript" src="resize.js"></script>
<script type="text/javascript" src="navtreedata.js"></script>
<script type="text/javascript" src="navtree.js"></script>
<link href="search/search.css" rel="stylesheet" type="text/css"/>
<script type="text/javascript" src="search/searchdata.js"></script>
<script type="text/javascript" src="search/search.js"></script>
<script type="text/javascript">
/* @license magnet:?xt=urn:btih:cf05388f2679ee054f2beb29a391d25f4e673ac3&dn=gpl-2.0.txt GPL-v2 */
$(document).ready(function() { init_search(); });
/* @license-end */
</script>
<link href="doxygen.css" rel="stylesheet" type="text/css" />
<link href="hdf5doxy.css" rel="stylesheet" type="text/css">
<!-- <link href="hdf5doxy.css" rel="stylesheet" type="text/css"/>
-->
<script type="text/javascript" src="hdf5_navtree_hacks.js"></script>
</head>
<body>
<div style="background:#FFDDDD;font-size:120%;text-align:center;margin:0;padding:5px">Please, help us to better serve our user community by answering the following short survey: <a href="https://www.hdfgroup.org/website-survey/">https://www.hdfgroup.org/website-survey/</a></div>
<div id="top"><!-- do not remove this div, it is closed by doxygen! -->
<div id="titlearea">
<table cellspacing="0" cellpadding="0">
<tbody>
<tr style="height: 56px;">
<td id="projectlogo"><img alt="Logo" src="HDFG-logo.png"/></td>
<td id="projectalign" style="padding-left: 0.5em;">
<div id="projectname"><a href="https://www.hdfgroup.org">HDF5</a>
 <span id="projectnumber">1.15.0.f39b228</span>
</div>
<div id="projectbrief">API Reference</div>
</td>
<td> <div id="MSearchBox" class="MSearchBoxInactive">
<span class="left">
<img id="MSearchSelect" src="search/mag_sel.svg"
onmouseover="return searchBox.OnSearchSelectShow()"
onmouseout="return searchBox.OnSearchSelectHide()"
alt=""/>
<input type="text" id="MSearchField" value="Search" accesskey="S"
onfocus="searchBox.OnSearchFieldFocus(true)"
onblur="searchBox.OnSearchFieldFocus(false)"
onkeyup="searchBox.OnSearchFieldChange(event)"/>
</span><span class="right">
<a id="MSearchClose" href="javascript:searchBox.CloseResultsWindow()"><img id="MSearchCloseImg" border="0" src="search/close.svg" alt=""/></a>
</span>
</div>
</td>
</tr>
</tbody>
</table>
</div>
<!-- end header part -->
<!-- Generated by Doxygen 1.9.1 -->
<script type="text/javascript">
/* @license magnet:?xt=urn:btih:cf05388f2679ee054f2beb29a391d25f4e673ac3&dn=gpl-2.0.txt GPL-v2 */
var searchBox = new SearchBox("searchBox", "search",false,'Search','.html');
/* @license-end */
</script>
</div><!-- top -->
<div id="side-nav" class="ui-resizable side-nav-resizable">
<div id="nav-tree">
<div id="nav-tree-contents">
<div id="nav-sync" class="sync"></div>
</div>
</div>
<div id="splitbar" style="-moz-user-select:none;"
class="ui-resizable-handle">
</div>
</div>
<script type="text/javascript">
/* @license magnet:?xt=urn:btih:cf05388f2679ee054f2beb29a391d25f4e673ac3&dn=gpl-2.0.txt GPL-v2 */
$(document).ready(function(){initNavTree('group___m_d_c.html',''); initResizable(); });
/* @license-end */
</script>
<div id="doc-content">
<!-- window showing the filter options -->
<div id="MSearchSelectWindow"
onmouseover="return searchBox.OnSearchSelectShow()"
onmouseout="return searchBox.OnSearchSelectHide()"
onkeydown="return searchBox.OnSearchSelectKey(event)">
</div>
<!-- iframe showing the search results (closed by default) -->
<div id="MSearchResultsWindow">
<iframe src="javascript:void(0)" frameborder="0"
name="MSearchResults" id="MSearchResults">
</iframe>
</div>
<div class="header">
<div class="summary">
<a href="#func-members">Functions</a> </div>
<div class="headertitle">
<div class="title">Metadata Cache<div class="ingroups"><a class="el" href="group___h5_f.html">Files (H5F)</a></div></div> </div>
</div><!--header-->
<div class="contents">
<a name="details" id="details"></a><h2 class="groupheader">Detailed Description</h2>
<div id="dynsection-0" onclick="return toggleVisibility(this)" class="dynheader closed" style="cursor:pointer;">
<img id="dynsection-0-trigger" src="closed.png" alt="+"/> Collaboration diagram for Metadata Cache:</div>
<div id="dynsection-0-summary" class="dynsummary" style="display:block;">
</div>
<div id="dynsection-0-content" class="dyncontent" style="display:none;">
<div class="center"><img src="group___m_d_c.png" border="0" usemap="#agroup______m__d__c" alt=""/></div>
<map name="agroup______m__d__c" id="agroup______m__d__c">
<area shape="rect" href="group___h5_f.html" title=" " alt="" coords="5,5,97,31"/>
<area shape="rect" title=" " alt="" coords="145,5,273,31"/>
</map>
</div>
<table class="memberdecls">
<tr class="heading"><td colspan="2"><h2 class="groupheader"><a name="func-members"></a>
Functions</h2></td></tr>
<tr class="memitem:gaa67f127242d4aaf244ae8ac4a1fe6a59"><td class="memItemLeft" align="right" valign="top"><a class="el" href="_h5public_8h.html#a3b079ecf932a5c599499cf7e298af160">herr_t</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="group___m_d_c.html#gaa67f127242d4aaf244ae8ac4a1fe6a59">H5Fget_mdc_config</a> (<a class="el" href="_h5_ipublic_8h.html#a0045db7ff9c22ad35db6ae91662e1943">hid_t</a> file_id, <a class="el" href="struct_h5_a_c__cache__config__t.html">H5AC_cache_config_t</a> *config_ptr)</td></tr>
<tr class="memdesc:gaa67f127242d4aaf244ae8ac4a1fe6a59"><td class="mdescLeft"> </td><td class="mdescRight">Obtains current metadata cache configuration for target file. <a href="group___m_d_c.html#gaa67f127242d4aaf244ae8ac4a1fe6a59">More...</a><br /></td></tr>
<tr class="separator:gaa67f127242d4aaf244ae8ac4a1fe6a59"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:ga81bc06be69131484eb04d01511b9c8f8"><td class="memItemLeft" align="right" valign="top"><a class="el" href="_h5public_8h.html#a3b079ecf932a5c599499cf7e298af160">herr_t</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="group___m_d_c.html#ga81bc06be69131484eb04d01511b9c8f8">H5Fset_mdc_config</a> (<a class="el" href="_h5_ipublic_8h.html#a0045db7ff9c22ad35db6ae91662e1943">hid_t</a> file_id, const <a class="el" href="struct_h5_a_c__cache__config__t.html">H5AC_cache_config_t</a> *config_ptr)</td></tr>
<tr class="memdesc:ga81bc06be69131484eb04d01511b9c8f8"><td class="mdescLeft"> </td><td class="mdescRight">Attempts to configure metadata cache of target file. <a href="group___m_d_c.html#ga81bc06be69131484eb04d01511b9c8f8">More...</a><br /></td></tr>
<tr class="separator:ga81bc06be69131484eb04d01511b9c8f8"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:gabea066c3fd924d2cf868ecee66a7c41f"><td class="memItemLeft" align="right" valign="top"><a class="el" href="_h5public_8h.html#a3b079ecf932a5c599499cf7e298af160">herr_t</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="group___m_d_c.html#gabea066c3fd924d2cf868ecee66a7c41f">H5Fget_mdc_hit_rate</a> (<a class="el" href="_h5_ipublic_8h.html#a0045db7ff9c22ad35db6ae91662e1943">hid_t</a> file_id, double *hit_rate_ptr)</td></tr>
<tr class="memdesc:gabea066c3fd924d2cf868ecee66a7c41f"><td class="mdescLeft"> </td><td class="mdescRight">Obtains target file's metadata cache hit rate. <a href="group___m_d_c.html#gabea066c3fd924d2cf868ecee66a7c41f">More...</a><br /></td></tr>
<tr class="separator:gabea066c3fd924d2cf868ecee66a7c41f"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:gacda6cbd60d3c50b59f801eba4e5a335f"><td class="memItemLeft" align="right" valign="top"><a class="el" href="_h5public_8h.html#a3b079ecf932a5c599499cf7e298af160">herr_t</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="group___m_d_c.html#gacda6cbd60d3c50b59f801eba4e5a335f">H5Fget_mdc_size</a> (<a class="el" href="_h5_ipublic_8h.html#a0045db7ff9c22ad35db6ae91662e1943">hid_t</a> file_id, size_t *max_size_ptr, size_t *min_clean_size_ptr, size_t *cur_size_ptr, int *cur_num_entries_ptr)</td></tr>
<tr class="memdesc:gacda6cbd60d3c50b59f801eba4e5a335f"><td class="mdescLeft"> </td><td class="mdescRight">Obtains current metadata cache size data for specified file. <a href="group___m_d_c.html#gacda6cbd60d3c50b59f801eba4e5a335f">More...</a><br /></td></tr>
<tr class="separator:gacda6cbd60d3c50b59f801eba4e5a335f"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:ga6708886c2bb8740327d9078d7840197f"><td class="memItemLeft" align="right" valign="top"><a class="el" href="_h5public_8h.html#a3b079ecf932a5c599499cf7e298af160">herr_t</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="group___m_d_c.html#ga6708886c2bb8740327d9078d7840197f">H5Freset_mdc_hit_rate_stats</a> (<a class="el" href="_h5_ipublic_8h.html#a0045db7ff9c22ad35db6ae91662e1943">hid_t</a> file_id)</td></tr>
<tr class="memdesc:ga6708886c2bb8740327d9078d7840197f"><td class="mdescLeft"> </td><td class="mdescRight">Resets hit rate statistics counters for the target file. <a href="group___m_d_c.html#ga6708886c2bb8740327d9078d7840197f">More...</a><br /></td></tr>
<tr class="separator:ga6708886c2bb8740327d9078d7840197f"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:ga378fb5863071278b47070cf205f53e67"><td class="memItemLeft" align="right" valign="top"><a class="el" href="_h5public_8h.html#a3b079ecf932a5c599499cf7e298af160">herr_t</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="group___m_d_c.html#ga378fb5863071278b47070cf205f53e67">H5Fstart_mdc_logging</a> (<a class="el" href="_h5_ipublic_8h.html#a0045db7ff9c22ad35db6ae91662e1943">hid_t</a> file_id)</td></tr>
<tr class="memdesc:ga378fb5863071278b47070cf205f53e67"><td class="mdescLeft"> </td><td class="mdescRight">Starts logging metadata cache events if logging was previously enabled. <a href="group___m_d_c.html#ga378fb5863071278b47070cf205f53e67">More...</a><br /></td></tr>
<tr class="separator:ga378fb5863071278b47070cf205f53e67"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:ga78627b23010f82002b837f4d312bf234"><td class="memItemLeft" align="right" valign="top"><a class="el" href="_h5public_8h.html#a3b079ecf932a5c599499cf7e298af160">herr_t</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="group___m_d_c.html#ga78627b23010f82002b837f4d312bf234">H5Fstop_mdc_logging</a> (<a class="el" href="_h5_ipublic_8h.html#a0045db7ff9c22ad35db6ae91662e1943">hid_t</a> file_id)</td></tr>
<tr class="memdesc:ga78627b23010f82002b837f4d312bf234"><td class="mdescLeft"> </td><td class="mdescRight">Stops logging metadata cache events if logging was previously enabled and is currently ongoing. <a href="group___m_d_c.html#ga78627b23010f82002b837f4d312bf234">More...</a><br /></td></tr>
<tr class="separator:ga78627b23010f82002b837f4d312bf234"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:ga998ebdc7b5190cf3d0fdf2fbe71e9780"><td class="memItemLeft" align="right" valign="top"><a class="el" href="_h5public_8h.html#a3b079ecf932a5c599499cf7e298af160">herr_t</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="group___m_d_c.html#ga998ebdc7b5190cf3d0fdf2fbe71e9780">H5Fget_mdc_logging_status</a> (<a class="el" href="_h5_ipublic_8h.html#a0045db7ff9c22ad35db6ae91662e1943">hid_t</a> file_id, <a class="el" href="_h5public_8h.html#ad470b00eccd2115c707c02de5fa1120d">hbool_t</a> *is_enabled, <a class="el" href="_h5public_8h.html#ad470b00eccd2115c707c02de5fa1120d">hbool_t</a> *is_currently_logging)</td></tr>
<tr class="memdesc:ga998ebdc7b5190cf3d0fdf2fbe71e9780"><td class="mdescLeft"> </td><td class="mdescRight">Gets the current metadata cache logging status. <a href="group___m_d_c.html#ga998ebdc7b5190cf3d0fdf2fbe71e9780">More...</a><br /></td></tr>
<tr class="separator:ga998ebdc7b5190cf3d0fdf2fbe71e9780"><td class="memSeparator" colspan="2"> </td></tr>
<tr class="memitem:ga7b37da15ff80c4aa5c275649f1f45b0a"><td class="memItemLeft" align="right" valign="top"><a class="el" href="_h5public_8h.html#a3b079ecf932a5c599499cf7e298af160">herr_t</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="group___m_d_c.html#ga7b37da15ff80c4aa5c275649f1f45b0a">H5Fget_mdc_image_info</a> (<a class="el" href="_h5_ipublic_8h.html#a0045db7ff9c22ad35db6ae91662e1943">hid_t</a> file_id, <a class="el" href="_h5public_8h.html#a8c86e866f40d7167cf9a1934c72b856f">haddr_t</a> *image_addr, <a class="el" href="_h5public_8h.html#a7f81cce70fb546af88da24d9285d3c1c">hsize_t</a> *image_size)</td></tr>
<tr class="memdesc:ga7b37da15ff80c4aa5c275649f1f45b0a"><td class="mdescLeft"> </td><td class="mdescRight">Obtains information about a cache image if it exists. <a href="group___m_d_c.html#ga7b37da15ff80c4aa5c275649f1f45b0a">More...</a><br /></td></tr>
<tr class="separator:ga7b37da15ff80c4aa5c275649f1f45b0a"><td class="memSeparator" colspan="2"> </td></tr>
</table>
<h2 class="groupheader">Function Documentation</h2>
<a id="gaa67f127242d4aaf244ae8ac4a1fe6a59"></a>
<h2 class="memtitle"><span class="permalink"><a href="#gaa67f127242d4aaf244ae8ac4a1fe6a59">◆ </a></span>H5Fget_mdc_config()</h2>
<div class="memitem">
<div class="memproto">
<table class="memname">
<tr>
<td class="memname"><a class="el" href="_h5public_8h.html#a3b079ecf932a5c599499cf7e298af160">herr_t</a> H5Fget_mdc_config </td>
<td>(</td>
<td class="paramtype"><a class="el" href="_h5_ipublic_8h.html#a0045db7ff9c22ad35db6ae91662e1943">hid_t</a> </td>
<td class="paramname"><em>file_id</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype"><a class="el" href="struct_h5_a_c__cache__config__t.html">H5AC_cache_config_t</a> * </td>
<td class="paramname"><em>config_ptr</em> </td>
</tr>
<tr>
<td></td>
<td>)</td>
<td></td><td></td>
</tr>
</table>
</div><div class="memdoc">
<p>Obtains current metadata cache configuration for target file. </p>
<dl class="params"><dt>Parameters</dt><dd>
<table class="params">
<tr><td class="paramdir">[in]</td><td class="paramname">file_id</td><td>File identifier </td></tr>
<tr><td class="paramdir">[in,out]</td><td class="paramname">config_ptr</td><td>Pointer to the <a class="el" href="struct_h5_a_c__cache__config__t.html">H5AC_cache_config_t</a> instance in which the current metadata cache configuration is to be reported. The fields of this structure are discussed <a class="el" href="_h5_a_c-cache-config-t.html">here</a>. </td></tr>
</table>
</dd>
</dl>
<dl class="section return"><dt>Returns</dt><dd>Returns a non-negative value if successful; otherwise, returns a negative value.</dd></dl>
<dl class="section note"><dt>Note</dt><dd>The <code>in</code> direction applies only to the <a class="el" href="struct_h5_a_c__cache__config__t.html#aad880fc4455c253781e8968f2239d56f">H5AC_cache_config_t::version</a> field. All other fields are out parameters.</dd></dl>
<p><a class="el" href="group___m_d_c.html#gaa67f127242d4aaf244ae8ac4a1fe6a59" title="Obtains current metadata cache configuration for target file.">H5Fget_mdc_config()</a> loads the current metadata cache configuration into the instance of <a class="el" href="struct_h5_a_c__cache__config__t.html">H5AC_cache_config_t</a> pointed to by the <code>config_ptr</code> parameter.<br />
The fields of the <a class="el" href="struct_h5_a_c__cache__config__t.html">H5AC_cache_config_t</a> structure are shown below: </p><div class="fragment"><div class="line"><span class="keyword">typedef</span> <span class="keyword">struct </span><a class="code" href="struct_h5_a_c__cache__config__t.html">H5AC_cache_config_t</a> {</div>
<div class="line"> <span class="comment">/* general configuration fields: */</span></div>
<div class="line"> <span class="keywordtype">int</span> <a class="code" href="struct_h5_a_c__cache__config__t.html#aad880fc4455c253781e8968f2239d56f">version</a>;</div>
<div class="line"> <a class="code" href="_h5public_8h.html#ad470b00eccd2115c707c02de5fa1120d">hbool_t</a> <a class="code" href="struct_h5_a_c__cache__config__t.html#aab04b3e770d1c2decc03f6fd94b64b17">rpt_fcn_enabled</a>;</div>
<div class="line"> <a class="code" href="_h5public_8h.html#ad470b00eccd2115c707c02de5fa1120d">hbool_t</a> <a class="code" href="struct_h5_a_c__cache__config__t.html#a6c03d051d5efb0e64bdca5d0b354a8b1">open_trace_file</a>;</div>
<div class="line"> <a class="code" href="_h5public_8h.html#ad470b00eccd2115c707c02de5fa1120d">hbool_t</a> <a class="code" href="struct_h5_a_c__cache__config__t.html#aced3486ae892a53209b7aae069a34be9">close_trace_file</a>;</div>
<div class="line"> <span class="keywordtype">char</span> <a class="code" href="struct_h5_a_c__cache__config__t.html#a92e7d20eb2b7b353961c64558ddac080">trace_file_name</a>[<a class="code" href="_h5_a_cpublic_8h.html#a717f1f3545cfc3d1b2208c96cc0c3bd3">H5AC__MAX_TRACE_FILE_NAME_LEN</a> + 1];</div>
<div class="line"> <a class="code" href="_h5public_8h.html#ad470b00eccd2115c707c02de5fa1120d">hbool_t</a> <a class="code" href="struct_h5_a_c__cache__config__t.html#a3d6e32c7a9bf8f65848c6840e1de8c6e">evictions_enabled</a>;</div>
<div class="line"> <a class="code" href="_h5public_8h.html#ad470b00eccd2115c707c02de5fa1120d">hbool_t</a> <a class="code" href="struct_h5_a_c__cache__config__t.html#a707198a337ece01a37dfec6e01275d82">set_initial_size</a>;</div>
<div class="line"> <span class="keywordtype">size_t</span> <a class="code" href="struct_h5_a_c__cache__config__t.html#a649236e7dd714855a50f122aa5caca9f">initial_size</a>;</div>
<div class="line"> <span class="keywordtype">double</span> <a class="code" href="struct_h5_a_c__cache__config__t.html#abd805b98f873c1720f34a0ce937838fd">min_clean_fraction</a>;</div>
<div class="line"> <span class="keywordtype">size_t</span> <a class="code" href="struct_h5_a_c__cache__config__t.html#af4728438dee601cb2554d9bf18d78a43">max_size</a>;</div>
<div class="line"> <span class="keywordtype">size_t</span> <a class="code" href="struct_h5_a_c__cache__config__t.html#af99ca22b80e05fd5b3603806348ab647">min_size</a>;</div>
<div class="line"> <span class="keywordtype">long</span> <span class="keywordtype">int</span> <a class="code" href="struct_h5_a_c__cache__config__t.html#ac998e51b01e0eef09d9a29c43f97e4bf">epoch_length</a>;</div>
<div class="line"> </div>
<div class="line"> <span class="comment">/* size increase control fields: */</span></div>
<div class="line"> <span class="keyword">enum</span> <a class="code" href="_h5_cpublic_8h.html#a040d488146ff1ca0a82209e9af3918fa">H5C_cache_incr_mode</a> <a class="code" href="struct_h5_a_c__cache__config__t.html#ae825aaf759060239e92170d20eb97d26">incr_mode</a>;</div>
<div class="line"> <span class="keywordtype">double</span> <a class="code" href="struct_h5_a_c__cache__config__t.html#a20f323fcb4747fc7228d2d74bb965586">lower_hr_threshold</a>;</div>
<div class="line"> <span class="keywordtype">double</span> <a class="code" href="struct_h5_a_c__cache__config__t.html#ac504dff76b24ab9f15536c51aec9fbbb">increment</a>;</div>
<div class="line"> <a class="code" href="_h5public_8h.html#ad470b00eccd2115c707c02de5fa1120d">hbool_t</a> <a class="code" href="struct_h5_a_c__cache__config__t.html#a322f2a955e71ab7ede483e991e76f806">apply_max_increment</a>;</div>
<div class="line"> <span class="keywordtype">size_t</span> <a class="code" href="struct_h5_a_c__cache__config__t.html#ad5a729f1d611f2780679a35b3524052c">max_increment</a>;</div>
<div class="line"> <span class="keyword">enum</span> <a class="code" href="_h5_cpublic_8h.html#aaaa13ca7756d135b7df6d5a6779ee908">H5C_cache_flash_incr_mode</a> <a class="code" href="struct_h5_a_c__cache__config__t.html#a0e25a1dc2c695bea335df0e23ed6363c">flash_incr_mode</a>;</div>
<div class="line"> <span class="keywordtype">double</span> <a class="code" href="struct_h5_a_c__cache__config__t.html#a77b1812e0407c9122db524462a5c9633">flash_multiple</a>;</div>
<div class="line"> <span class="keywordtype">double</span> <a class="code" href="struct_h5_a_c__cache__config__t.html#a95fb1e03a77ef5c109d0c851416ced55">flash_threshold</a>;</div>
<div class="line"> </div>
<div class="line"> <span class="comment">/* size decrease control fields: */</span></div>
<div class="line"> <span class="keyword">enum</span> <a class="code" href="_h5_cpublic_8h.html#a4f8534794ad9a977185a5d608c0af04f">H5C_cache_decr_mode</a> <a class="code" href="struct_h5_a_c__cache__config__t.html#a5df68196b281c19d8ab7da0788566aec">decr_mode</a>;</div>
<div class="line"> <span class="keywordtype">double</span> <a class="code" href="struct_h5_a_c__cache__config__t.html#a84a5ff4ac69196aa27c14f6f796db596">upper_hr_threshold</a>;</div>
<div class="line"> <span class="keywordtype">double</span> <a class="code" href="struct_h5_a_c__cache__config__t.html#a54007d3f2afb718b437f499a5c8b46d9">decrement</a>;</div>
<div class="line"> <a class="code" href="_h5public_8h.html#ad470b00eccd2115c707c02de5fa1120d">hbool_t</a> <a class="code" href="struct_h5_a_c__cache__config__t.html#ac2c89a735413e4c36d6f463c4890ab42">apply_max_decrement</a>;</div>
<div class="line"> <span class="keywordtype">size_t</span> <a class="code" href="struct_h5_a_c__cache__config__t.html#a75e875a61c9da7f82482d0f6fe6e7152">max_decrement</a>;</div>
<div class="line"> <span class="keywordtype">int</span> <a class="code" href="struct_h5_a_c__cache__config__t.html#a7ac41e345300bdecd9943e855d55b71b">epochs_before_eviction</a>;</div>
<div class="line"> <a class="code" href="_h5public_8h.html#ad470b00eccd2115c707c02de5fa1120d">hbool_t</a> <a class="code" href="struct_h5_a_c__cache__config__t.html#a6c5cff8e8a21230cc7f21859d8d6bd22">apply_empty_reserve</a>;</div>
<div class="line"> <span class="keywordtype">double</span> <a class="code" href="struct_h5_a_c__cache__config__t.html#a9c1ae995513b55737aad09e11beff733">empty_reserve</a>;</div>
<div class="line"> </div>
<div class="line"> <span class="comment">/* parallel configuration fields: */</span></div>
<div class="line"> <span class="keywordtype">size_t</span> <a class="code" href="struct_h5_a_c__cache__config__t.html#a8e3c2a2d300b7a8f8d3705fc5e59a3c1">dirty_bytes_threshold</a>;</div>
<div class="line"> <span class="keywordtype">int</span> <a class="code" href="struct_h5_a_c__cache__config__t.html#a83a536128dbb7785b2553c294f33d1fe">metadata_write_strategy</a>;</div>
<div class="line">} <a class="code" href="struct_h5_a_c__cache__config__t.html">H5AC_cache_config_t</a>;</div>
<div class="ttc" id="a_h5_a_cpublic_8h_html_a717f1f3545cfc3d1b2208c96cc0c3bd3"><div class="ttname"><a href="_h5_a_cpublic_8h.html#a717f1f3545cfc3d1b2208c96cc0c3bd3">H5AC__MAX_TRACE_FILE_NAME_LEN</a></div><div class="ttdeci">#define H5AC__MAX_TRACE_FILE_NAME_LEN</div><div class="ttdef"><b>Definition:</b> H5ACpublic.h:432</div></div>
<div class="ttc" id="a_h5_cpublic_8h_html_a040d488146ff1ca0a82209e9af3918fa"><div class="ttname"><a href="_h5_cpublic_8h.html#a040d488146ff1ca0a82209e9af3918fa">H5C_cache_incr_mode</a></div><div class="ttdeci">H5C_cache_incr_mode</div><div class="ttdef"><b>Definition:</b> H5Cpublic.h:26</div></div>
<div class="ttc" id="a_h5_cpublic_8h_html_a4f8534794ad9a977185a5d608c0af04f"><div class="ttname"><a href="_h5_cpublic_8h.html#a4f8534794ad9a977185a5d608c0af04f">H5C_cache_decr_mode</a></div><div class="ttdeci">H5C_cache_decr_mode</div><div class="ttdef"><b>Definition:</b> H5Cpublic.h:42</div></div>
<div class="ttc" id="a_h5_cpublic_8h_html_aaaa13ca7756d135b7df6d5a6779ee908"><div class="ttname"><a href="_h5_cpublic_8h.html#aaaa13ca7756d135b7df6d5a6779ee908">H5C_cache_flash_incr_mode</a></div><div class="ttdeci">H5C_cache_flash_incr_mode</div><div class="ttdef"><b>Definition:</b> H5Cpublic.h:34</div></div>
<div class="ttc" id="a_h5public_8h_html_ad470b00eccd2115c707c02de5fa1120d"><div class="ttname"><a href="_h5public_8h.html#ad470b00eccd2115c707c02de5fa1120d">hbool_t</a></div><div class="ttdeci">bool hbool_t</div><div class="ttdef"><b>Definition:</b> H5public.h:249</div></div>
<div class="ttc" id="astruct_h5_a_c__cache__config__t_html"><div class="ttname"><a href="struct_h5_a_c__cache__config__t.html">H5AC_cache_config_t</a></div><div class="ttdef"><b>Definition:</b> H5ACpublic.h:462</div></div>
<div class="ttc" id="astruct_h5_a_c__cache__config__t_html_a0e25a1dc2c695bea335df0e23ed6363c"><div class="ttname"><a href="struct_h5_a_c__cache__config__t.html#a0e25a1dc2c695bea335df0e23ed6363c">H5AC_cache_config_t::flash_incr_mode</a></div><div class="ttdeci">enum H5C_cache_flash_incr_mode flash_incr_mode</div><div class="ttdef"><b>Definition:</b> H5ACpublic.h:615</div></div>
<div class="ttc" id="astruct_h5_a_c__cache__config__t_html_a20f323fcb4747fc7228d2d74bb965586"><div class="ttname"><a href="struct_h5_a_c__cache__config__t.html#a20f323fcb4747fc7228d2d74bb965586">H5AC_cache_config_t::lower_hr_threshold</a></div><div class="ttdeci">double lower_hr_threshold</div><div class="ttdef"><b>Definition:</b> H5ACpublic.h:585</div></div>
<div class="ttc" id="astruct_h5_a_c__cache__config__t_html_a322f2a955e71ab7ede483e991e76f806"><div class="ttname"><a href="struct_h5_a_c__cache__config__t.html#a322f2a955e71ab7ede483e991e76f806">H5AC_cache_config_t::apply_max_increment</a></div><div class="ttdeci">hbool_t apply_max_increment</div><div class="ttdef"><b>Definition:</b> H5ACpublic.h:607</div></div>
<div class="ttc" id="astruct_h5_a_c__cache__config__t_html_a3d6e32c7a9bf8f65848c6840e1de8c6e"><div class="ttname"><a href="struct_h5_a_c__cache__config__t.html#a3d6e32c7a9bf8f65848c6840e1de8c6e">H5AC_cache_config_t::evictions_enabled</a></div><div class="ttdeci">hbool_t evictions_enabled</div><div class="ttdef"><b>Definition:</b> H5ACpublic.h:526</div></div>
<div class="ttc" id="astruct_h5_a_c__cache__config__t_html_a54007d3f2afb718b437f499a5c8b46d9"><div class="ttname"><a href="struct_h5_a_c__cache__config__t.html#a54007d3f2afb718b437f499a5c8b46d9">H5AC_cache_config_t::decrement</a></div><div class="ttdeci">double decrement</div><div class="ttdef"><b>Definition:</b> H5ACpublic.h:657</div></div>
<div class="ttc" id="astruct_h5_a_c__cache__config__t_html_a5df68196b281c19d8ab7da0788566aec"><div class="ttname"><a href="struct_h5_a_c__cache__config__t.html#a5df68196b281c19d8ab7da0788566aec">H5AC_cache_config_t::decr_mode</a></div><div class="ttdeci">enum H5C_cache_decr_mode decr_mode</div><div class="ttdef"><b>Definition:</b> H5ACpublic.h:638</div></div>
<div class="ttc" id="astruct_h5_a_c__cache__config__t_html_a649236e7dd714855a50f122aa5caca9f"><div class="ttname"><a href="struct_h5_a_c__cache__config__t.html#a649236e7dd714855a50f122aa5caca9f">H5AC_cache_config_t::initial_size</a></div><div class="ttdeci">size_t initial_size</div><div class="ttdef"><b>Definition:</b> H5ACpublic.h:550</div></div>
<div class="ttc" id="astruct_h5_a_c__cache__config__t_html_a6c03d051d5efb0e64bdca5d0b354a8b1"><div class="ttname"><a href="struct_h5_a_c__cache__config__t.html#a6c03d051d5efb0e64bdca5d0b354a8b1">H5AC_cache_config_t::open_trace_file</a></div><div class="ttdeci">hbool_t open_trace_file</div><div class="ttdef"><b>Definition:</b> H5ACpublic.h:478</div></div>
<div class="ttc" id="astruct_h5_a_c__cache__config__t_html_a6c5cff8e8a21230cc7f21859d8d6bd22"><div class="ttname"><a href="struct_h5_a_c__cache__config__t.html#a6c5cff8e8a21230cc7f21859d8d6bd22">H5AC_cache_config_t::apply_empty_reserve</a></div><div class="ttdeci">hbool_t apply_empty_reserve</div><div class="ttdef"><b>Definition:</b> H5ACpublic.h:683</div></div>
<div class="ttc" id="astruct_h5_a_c__cache__config__t_html_a707198a337ece01a37dfec6e01275d82"><div class="ttname"><a href="struct_h5_a_c__cache__config__t.html#a707198a337ece01a37dfec6e01275d82">H5AC_cache_config_t::set_initial_size</a></div><div class="ttdeci">hbool_t set_initial_size</div><div class="ttdef"><b>Definition:</b> H5ACpublic.h:546</div></div>
<div class="ttc" id="astruct_h5_a_c__cache__config__t_html_a75e875a61c9da7f82482d0f6fe6e7152"><div class="ttname"><a href="struct_h5_a_c__cache__config__t.html#a75e875a61c9da7f82482d0f6fe6e7152">H5AC_cache_config_t::max_decrement</a></div><div class="ttdeci">size_t max_decrement</div><div class="ttdef"><b>Definition:</b> H5ACpublic.h:673</div></div>
<div class="ttc" id="astruct_h5_a_c__cache__config__t_html_a77b1812e0407c9122db524462a5c9633"><div class="ttname"><a href="struct_h5_a_c__cache__config__t.html#a77b1812e0407c9122db524462a5c9633">H5AC_cache_config_t::flash_multiple</a></div><div class="ttdeci">double flash_multiple</div><div class="ttdef"><b>Definition:</b> H5ACpublic.h:620</div></div>
<div class="ttc" id="astruct_h5_a_c__cache__config__t_html_a7ac41e345300bdecd9943e855d55b71b"><div class="ttname"><a href="struct_h5_a_c__cache__config__t.html#a7ac41e345300bdecd9943e855d55b71b">H5AC_cache_config_t::epochs_before_eviction</a></div><div class="ttdeci">int epochs_before_eviction</div><div class="ttdef"><b>Definition:</b> H5ACpublic.h:677</div></div>
<div class="ttc" id="astruct_h5_a_c__cache__config__t_html_a83a536128dbb7785b2553c294f33d1fe"><div class="ttname"><a href="struct_h5_a_c__cache__config__t.html#a83a536128dbb7785b2553c294f33d1fe">H5AC_cache_config_t::metadata_write_strategy</a></div><div class="ttdeci">int metadata_write_strategy</div><div class="ttdef"><b>Definition:</b> H5ACpublic.h:707</div></div>
<div class="ttc" id="astruct_h5_a_c__cache__config__t_html_a84a5ff4ac69196aa27c14f6f796db596"><div class="ttname"><a href="struct_h5_a_c__cache__config__t.html#a84a5ff4ac69196aa27c14f6f796db596">H5AC_cache_config_t::upper_hr_threshold</a></div><div class="ttdeci">double upper_hr_threshold</div><div class="ttdef"><b>Definition:</b> H5ACpublic.h:643</div></div>
<div class="ttc" id="astruct_h5_a_c__cache__config__t_html_a8e3c2a2d300b7a8f8d3705fc5e59a3c1"><div class="ttname"><a href="struct_h5_a_c__cache__config__t.html#a8e3c2a2d300b7a8f8d3705fc5e59a3c1">H5AC_cache_config_t::dirty_bytes_threshold</a></div><div class="ttdeci">size_t dirty_bytes_threshold</div><div class="ttdef"><b>Definition:</b> H5ACpublic.h:696</div></div>
<div class="ttc" id="astruct_h5_a_c__cache__config__t_html_a92e7d20eb2b7b353961c64558ddac080"><div class="ttname"><a href="struct_h5_a_c__cache__config__t.html#a92e7d20eb2b7b353961c64558ddac080">H5AC_cache_config_t::trace_file_name</a></div><div class="ttdeci">char trace_file_name[1024+1]</div><div class="ttdef"><b>Definition:</b> H5ACpublic.h:511</div></div>
<div class="ttc" id="astruct_h5_a_c__cache__config__t_html_a95fb1e03a77ef5c109d0c851416ced55"><div class="ttname"><a href="struct_h5_a_c__cache__config__t.html#a95fb1e03a77ef5c109d0c851416ced55">H5AC_cache_config_t::flash_threshold</a></div><div class="ttdeci">double flash_threshold</div><div class="ttdef"><b>Definition:</b> H5ACpublic.h:629</div></div>
<div class="ttc" id="astruct_h5_a_c__cache__config__t_html_a9c1ae995513b55737aad09e11beff733"><div class="ttname"><a href="struct_h5_a_c__cache__config__t.html#a9c1ae995513b55737aad09e11beff733">H5AC_cache_config_t::empty_reserve</a></div><div class="ttdeci">double empty_reserve</div><div class="ttdef"><b>Definition:</b> H5ACpublic.h:687</div></div>
<div class="ttc" id="astruct_h5_a_c__cache__config__t_html_aab04b3e770d1c2decc03f6fd94b64b17"><div class="ttname"><a href="struct_h5_a_c__cache__config__t.html#aab04b3e770d1c2decc03f6fd94b64b17">H5AC_cache_config_t::rpt_fcn_enabled</a></div><div class="ttdeci">hbool_t rpt_fcn_enabled</div><div class="ttdef"><b>Definition:</b> H5ACpublic.h:470</div></div>
<div class="ttc" id="astruct_h5_a_c__cache__config__t_html_aad880fc4455c253781e8968f2239d56f"><div class="ttname"><a href="struct_h5_a_c__cache__config__t.html#aad880fc4455c253781e8968f2239d56f">H5AC_cache_config_t::version</a></div><div class="ttdeci">int version</div><div class="ttdef"><b>Definition:</b> H5ACpublic.h:465</div></div>
<div class="ttc" id="astruct_h5_a_c__cache__config__t_html_abd805b98f873c1720f34a0ce937838fd"><div class="ttname"><a href="struct_h5_a_c__cache__config__t.html#abd805b98f873c1720f34a0ce937838fd">H5AC_cache_config_t::min_clean_fraction</a></div><div class="ttdeci">double min_clean_fraction</div><div class="ttdef"><b>Definition:</b> H5ACpublic.h:556</div></div>
<div class="ttc" id="astruct_h5_a_c__cache__config__t_html_ac2c89a735413e4c36d6f463c4890ab42"><div class="ttname"><a href="struct_h5_a_c__cache__config__t.html#ac2c89a735413e4c36d6f463c4890ab42">H5AC_cache_config_t::apply_max_decrement</a></div><div class="ttdeci">hbool_t apply_max_decrement</div><div class="ttdef"><b>Definition:</b> H5ACpublic.h:669</div></div>
<div class="ttc" id="astruct_h5_a_c__cache__config__t_html_ac504dff76b24ab9f15536c51aec9fbbb"><div class="ttname"><a href="struct_h5_a_c__cache__config__t.html#ac504dff76b24ab9f15536c51aec9fbbb">H5AC_cache_config_t::increment</a></div><div class="ttdeci">double increment</div><div class="ttdef"><b>Definition:</b> H5ACpublic.h:595</div></div>
<div class="ttc" id="astruct_h5_a_c__cache__config__t_html_ac998e51b01e0eef09d9a29c43f97e4bf"><div class="ttname"><a href="struct_h5_a_c__cache__config__t.html#ac998e51b01e0eef09d9a29c43f97e4bf">H5AC_cache_config_t::epoch_length</a></div><div class="ttdeci">long int epoch_length</div><div class="ttdef"><b>Definition:</b> H5ACpublic.h:573</div></div>
<div class="ttc" id="astruct_h5_a_c__cache__config__t_html_aced3486ae892a53209b7aae069a34be9"><div class="ttname"><a href="struct_h5_a_c__cache__config__t.html#aced3486ae892a53209b7aae069a34be9">H5AC_cache_config_t::close_trace_file</a></div><div class="ttdeci">hbool_t close_trace_file</div><div class="ttdef"><b>Definition:</b> H5ACpublic.h:499</div></div>
<div class="ttc" id="astruct_h5_a_c__cache__config__t_html_ad5a729f1d611f2780679a35b3524052c"><div class="ttname"><a href="struct_h5_a_c__cache__config__t.html#ad5a729f1d611f2780679a35b3524052c">H5AC_cache_config_t::max_increment</a></div><div class="ttdeci">size_t max_increment</div><div class="ttdef"><b>Definition:</b> H5ACpublic.h:611</div></div>
<div class="ttc" id="astruct_h5_a_c__cache__config__t_html_ae825aaf759060239e92170d20eb97d26"><div class="ttname"><a href="struct_h5_a_c__cache__config__t.html#ae825aaf759060239e92170d20eb97d26">H5AC_cache_config_t::incr_mode</a></div><div class="ttdeci">enum H5C_cache_incr_mode incr_mode</div><div class="ttdef"><b>Definition:</b> H5ACpublic.h:580</div></div>
<div class="ttc" id="astruct_h5_a_c__cache__config__t_html_af4728438dee601cb2554d9bf18d78a43"><div class="ttname"><a href="struct_h5_a_c__cache__config__t.html#af4728438dee601cb2554d9bf18d78a43">H5AC_cache_config_t::max_size</a></div><div class="ttdeci">size_t max_size</div><div class="ttdef"><b>Definition:</b> H5ACpublic.h:565</div></div>
<div class="ttc" id="astruct_h5_a_c__cache__config__t_html_af99ca22b80e05fd5b3603806348ab647"><div class="ttname"><a href="struct_h5_a_c__cache__config__t.html#af99ca22b80e05fd5b3603806348ab647">H5AC_cache_config_t::min_size</a></div><div class="ttdeci">size_t min_size</div><div class="ttdef"><b>Definition:</b> H5ACpublic.h:569</div></div>
</div><!-- fragment --><p> (Click on a enumerator, field, or type for more information.)</p>
<dl class="section since"><dt>Since</dt><dd>1.8.0 </dd></dl>
</div>
</div>
<a id="gabea066c3fd924d2cf868ecee66a7c41f"></a>
<h2 class="memtitle"><span class="permalink"><a href="#gabea066c3fd924d2cf868ecee66a7c41f">◆ </a></span>H5Fget_mdc_hit_rate()</h2>
<div class="memitem">
<div class="memproto">
<table class="memname">
<tr>
<td class="memname"><a class="el" href="_h5public_8h.html#a3b079ecf932a5c599499cf7e298af160">herr_t</a> H5Fget_mdc_hit_rate </td>
<td>(</td>
<td class="paramtype"><a class="el" href="_h5_ipublic_8h.html#a0045db7ff9c22ad35db6ae91662e1943">hid_t</a> </td>
<td class="paramname"><em>file_id</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">double * </td>
<td class="paramname"><em>hit_rate_ptr</em> </td>
</tr>
<tr>
<td></td>
<td>)</td>
<td></td><td></td>
</tr>
</table>
</div><div class="memdoc">
<p>Obtains target file's metadata cache hit rate. </p>
<dl class="params"><dt>Parameters</dt><dd>
<table class="params">
<tr><td class="paramdir">[in]</td><td class="paramname">file_id</td><td>File identifier </td></tr>
<tr><td class="paramdir">[out]</td><td class="paramname">hit_rate_ptr</td><td>Pointer to the double in which the hit rate is returned. Note that <code>hit_rate_ptr</code> is undefined if the API call fails </td></tr>
</table>
</dd>
</dl>
<dl class="section return"><dt>Returns</dt><dd>Returns a non-negative value if successful; otherwise, returns a negative value.</dd></dl>
<p><a class="el" href="group___m_d_c.html#gabea066c3fd924d2cf868ecee66a7c41f" title="Obtains target file's metadata cache hit rate.">H5Fget_mdc_hit_rate()</a> queries the metadata cache of the target file to obtain its hit rate <code>(cache hits / (cache hits + cache misses))</code> since the last time hit rate statistics were reset. If the cache has not been accessed since the last time the hit rate stats were reset, the hit rate is defined to be 0.0.</p>
<p>The hit rate stats can be reset either manually (via <a class="el" href="group___m_d_c.html#ga6708886c2bb8740327d9078d7840197f" title="Resets hit rate statistics counters for the target file.">H5Freset_mdc_hit_rate_stats()</a>), or automatically. If the cache's adaptive resize code is enabled, the hit rate stats will be reset once per epoch. If they are reset manually as well, the cache may behave oddly.</p>
<p>See the overview of the metadata cache in the special topics section of the user manual for details on the metadata cache and its adaptive resize algorithms. </p>
</div>
</div>
<a id="ga7b37da15ff80c4aa5c275649f1f45b0a"></a>
<h2 class="memtitle"><span class="permalink"><a href="#ga7b37da15ff80c4aa5c275649f1f45b0a">◆ </a></span>H5Fget_mdc_image_info()</h2>
<div class="memitem">
<div class="memproto">
<table class="memname">
<tr>
<td class="memname"><a class="el" href="_h5public_8h.html#a3b079ecf932a5c599499cf7e298af160">herr_t</a> H5Fget_mdc_image_info </td>
<td>(</td>
<td class="paramtype"><a class="el" href="_h5_ipublic_8h.html#a0045db7ff9c22ad35db6ae91662e1943">hid_t</a> </td>
<td class="paramname"><em>file_id</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype"><a class="el" href="_h5public_8h.html#a8c86e866f40d7167cf9a1934c72b856f">haddr_t</a> * </td>
<td class="paramname"><em>image_addr</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype"><a class="el" href="_h5public_8h.html#a7f81cce70fb546af88da24d9285d3c1c">hsize_t</a> * </td>
<td class="paramname"><em>image_size</em> </td>
</tr>
<tr>
<td></td>
<td>)</td>
<td></td><td></td>
</tr>
</table>
</div><div class="memdoc">
<p>Obtains information about a cache image if it exists. </p>
<dl class="params"><dt>Parameters</dt><dd>
<table class="params">
<tr><td class="paramdir">[in]</td><td class="paramname">file_id</td><td>File identifier </td></tr>
<tr><td class="paramdir">[out]</td><td class="paramname">image_addr</td><td>Offset of the cache image if it exists, or <a class="el" href="_h5public_8h.html#a676244a60b85ee8bbd111afd4a8fce3c">HADDR_UNDEF</a> if it does not </td></tr>
<tr><td class="paramdir">[out]</td><td class="paramname">image_size</td><td>Length of the cache image if it exists, or 0 if it does not </td></tr>
</table>
</dd>
</dl>
<dl class="section return"><dt>Returns</dt><dd>Returns a non-negative value if successful; otherwise, returns a negative value.</dd></dl>
<p><a class="el" href="group___m_d_c.html#ga7b37da15ff80c4aa5c275649f1f45b0a" title="Obtains information about a cache image if it exists.">H5Fget_mdc_image_info()</a> returns information about a cache image if it exists.</p>
<p>When an HDF5 file is opened in Read/Write mode, any metadata cache image will be read and deleted from the file on the first metadata cache access (or, if persistent free space managers are enabled, on the first file space allocation / deallocation, or read of free space manager status, whichever comes first).</p>
<p>Thus, if the file is opened Read/Write, <a class="el" href="group___m_d_c.html#ga7b37da15ff80c4aa5c275649f1f45b0a" title="Obtains information about a cache image if it exists.">H5Fget_mdc_image_info()</a> should be called immediately after file open and before any other operation. If <a class="el" href="group___m_d_c.html#ga7b37da15ff80c4aa5c275649f1f45b0a" title="Obtains information about a cache image if it exists.">H5Fget_mdc_image_info()</a> is called after the cache image is loaded, it will correctly report that no cache image exists, as the image will have already been read and deleted from the file. In the Read Only case, the function may be called at any time, as any cache image will not be deleted from the file. </p>
<dl class="section since"><dt>Since</dt><dd>1.10.1 </dd></dl>
</div>
</div>
<a id="ga998ebdc7b5190cf3d0fdf2fbe71e9780"></a>
<h2 class="memtitle"><span class="permalink"><a href="#ga998ebdc7b5190cf3d0fdf2fbe71e9780">◆ </a></span>H5Fget_mdc_logging_status()</h2>
<div class="memitem">
<div class="memproto">
<table class="memname">
<tr>
<td class="memname"><a class="el" href="_h5public_8h.html#a3b079ecf932a5c599499cf7e298af160">herr_t</a> H5Fget_mdc_logging_status </td>
<td>(</td>
<td class="paramtype"><a class="el" href="_h5_ipublic_8h.html#a0045db7ff9c22ad35db6ae91662e1943">hid_t</a> </td>
<td class="paramname"><em>file_id</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype"><a class="el" href="_h5public_8h.html#ad470b00eccd2115c707c02de5fa1120d">hbool_t</a> * </td>
<td class="paramname"><em>is_enabled</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype"><a class="el" href="_h5public_8h.html#ad470b00eccd2115c707c02de5fa1120d">hbool_t</a> * </td>
<td class="paramname"><em>is_currently_logging</em> </td>
</tr>
<tr>
<td></td>
<td>)</td>
<td></td><td></td>
</tr>
</table>
</div><div class="memdoc">
<p>Gets the current metadata cache logging status. </p>
<dl class="params"><dt>Parameters</dt><dd>
<table class="params">
<tr><td class="paramdir">[in]</td><td class="paramname">file_id</td><td>File identifier </td></tr>
<tr><td class="paramdir">[out]</td><td class="paramname">is_enabled</td><td>Whether logging is enabled </td></tr>
<tr><td class="paramdir">[out]</td><td class="paramname">is_currently_logging</td><td>Whether events are currently being logged </td></tr>
</table>
</dd>
</dl>
<dl class="section return"><dt>Returns</dt><dd>Returns a non-negative value if successful; otherwise, returns a negative value.</dd></dl>
<p>The metadata cache is a central part of the HDF5 library through which all <em>file metadata</em> reads and writes take place. File metadata is normally invisible to the user and is used by the library for purposes such as locating and indexing data. File metadata should not be confused with user metadata, which consists of attributes created by users and attached to HDF5 objects such as datasets via H5A API calls.</p>
<p>Due to the complexity of the cache, a trace/logging feature has been created that can be used by HDF5 developers for debugging and performance analysis. The functions that control this functionality will normally be of use to a very limited number of developers outside of The HDF Group. The functions have been documented to help users create logs that can be sent with bug reports.</p>
<p>Control of the log functionality is straightforward. Logging is enabled via the <a class="el" href="group___f_a_p_l.html#ga4d7206c5679d7243410058eceae59b2c" title="Sets metadata cache logging options.">H5Pset_mdc_log_options()</a> function, which will modify the file access property list used to open or create a file. This function has a flag that determines whether logging begins at file open or starts in a paused state. Log messages can then be controlled via the <a class="el" href="group___m_d_c.html#ga378fb5863071278b47070cf205f53e67" title="Starts logging metadata cache events if logging was previously enabled.">H5Fstart_mdc_logging()</a> and <a class="el" href="group___m_d_c.html#ga78627b23010f82002b837f4d312bf234" title="Stops logging metadata cache events if logging was previously enabled and is currently ongoing.">H5Fstop_mdc_logging()</a> functions. <a class="el" href="group___f_a_p_l.html#gaa3a1ca6e294cc5074933239cc3d0e4a3" title="Gets metadata cache logging options.">H5Pget_mdc_log_options()</a> can be used to examine a file access property list, and <a class="el" href="group___m_d_c.html#ga998ebdc7b5190cf3d0fdf2fbe71e9780" title="Gets the current metadata cache logging status.">H5Fget_mdc_logging_status()</a> will return the current state of the logging flags.</p>
<p>The log format is described in the <a href="https://portal.hdfgroup.org/display/HDF5/H5F_START_MDC_LOGGING">Metadata Cache Logging</a> document.</p>
<dl class="section note"><dt>Note</dt><dd>Unlike <a class="el" href="group___m_d_c.html#ga378fb5863071278b47070cf205f53e67" title="Starts logging metadata cache events if logging was previously enabled.">H5Fstart_mdc_logging()</a> and <a class="el" href="group___m_d_c.html#ga78627b23010f82002b837f4d312bf234" title="Stops logging metadata cache events if logging was previously enabled and is currently ongoing.">H5Fstop_mdc_logging()</a>, this function can be called on any open file identifier.</dd></dl>
<dl class="section since"><dt>Since</dt><dd>1.10.0 </dd></dl>
</div>
</div>
<a id="gacda6cbd60d3c50b59f801eba4e5a335f"></a>
<h2 class="memtitle"><span class="permalink"><a href="#gacda6cbd60d3c50b59f801eba4e5a335f">◆ </a></span>H5Fget_mdc_size()</h2>
<div class="memitem">
<div class="memproto">
<table class="memname">
<tr>
<td class="memname"><a class="el" href="_h5public_8h.html#a3b079ecf932a5c599499cf7e298af160">herr_t</a> H5Fget_mdc_size </td>
<td>(</td>
<td class="paramtype"><a class="el" href="_h5_ipublic_8h.html#a0045db7ff9c22ad35db6ae91662e1943">hid_t</a> </td>
<td class="paramname"><em>file_id</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">size_t * </td>
<td class="paramname"><em>max_size_ptr</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">size_t * </td>
<td class="paramname"><em>min_clean_size_ptr</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">size_t * </td>
<td class="paramname"><em>cur_size_ptr</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">int * </td>
<td class="paramname"><em>cur_num_entries_ptr</em> </td>
</tr>
<tr>
<td></td>
<td>)</td>
<td></td><td></td>
</tr>
</table>
</div><div class="memdoc">
<p>Obtains current metadata cache size data for specified file. </p>
<dl class="params"><dt>Parameters</dt><dd>
<table class="params">
<tr><td class="paramdir">[in]</td><td class="paramname">file_id</td><td>File identifier </td></tr>
<tr><td class="paramdir">[out]</td><td class="paramname">max_size_ptr</td><td>Pointer to the location in which the current cache maximum size is to be returned, or NULL if this datum is not desired </td></tr>
<tr><td class="paramdir">[out]</td><td class="paramname">min_clean_size_ptr</td><td>Pointer to the location in which the current cache minimum clean size is to be returned, or NULL if that datum is not desired </td></tr>
<tr><td class="paramdir">[out]</td><td class="paramname">cur_size_ptr</td><td>Pointer to the location in which the current cache size is to be returned, or NULL if that datum is not desired </td></tr>
<tr><td class="paramdir">[out]</td><td class="paramname">cur_num_entries_ptr</td><td>Pointer to the location in which the current number of entries in the cache is to be returned, or NULL if that datum is not desired </td></tr>
</table>
</dd>
</dl>
<dl class="section return"><dt>Returns</dt><dd>Returns a non-negative value if successful; otherwise, returns a negative value.</dd></dl>
<p><a class="el" href="group___m_d_c.html#gacda6cbd60d3c50b59f801eba4e5a335f" title="Obtains current metadata cache size data for specified file.">H5Fget_mdc_size()</a> queries the metadata cache of the target file for the desired size information, and returns this information in the locations indicated by the pointer parameters. If any pointer parameter is NULL, the associated data is not returned.</p>
<p>If the API call fails, the values returned via the pointer parameters are undefined.</p>
<p>If adaptive cache resizing is enabled, the cache maximum size and minimum clean size may change at the end of each epoch. Current size and current number of entries can change on each cache access.</p>
<p>Current size can exceed maximum size under certain conditions. See the overview of the metadata cache in the special topics section of the user manual for a discussion of this. </p>
</div>
</div>
<a id="ga6708886c2bb8740327d9078d7840197f"></a>
<h2 class="memtitle"><span class="permalink"><a href="#ga6708886c2bb8740327d9078d7840197f">◆ </a></span>H5Freset_mdc_hit_rate_stats()</h2>
<div class="memitem">
<div class="memproto">
<table class="memname">
<tr>
<td class="memname"><a class="el" href="_h5public_8h.html#a3b079ecf932a5c599499cf7e298af160">herr_t</a> H5Freset_mdc_hit_rate_stats </td>
<td>(</td>
<td class="paramtype"><a class="el" href="_h5_ipublic_8h.html#a0045db7ff9c22ad35db6ae91662e1943">hid_t</a> </td>
<td class="paramname"><em>file_id</em></td><td>)</td>
<td></td>
</tr>
</table>
</div><div class="memdoc">
<p>Resets hit rate statistics counters for the target file. </p>
<dl class="params"><dt>Parameters</dt><dd>
<table class="params">
<tr><td class="paramdir">[in]</td><td class="paramname">file_id</td><td>File identifier </td></tr>
</table>
</dd>
</dl>
<dl class="section return"><dt>Returns</dt><dd>Returns a non-negative value if successful; otherwise, returns a negative value.</dd></dl>
<p><a class="el" href="group___m_d_c.html#ga6708886c2bb8740327d9078d7840197f" title="Resets hit rate statistics counters for the target file.">H5Freset_mdc_hit_rate_stats()</a> resets the hit rate statistics counters in the metadata cache associated with the specified file.</p>
<p>If the adaptive cache resizing code is enabled, the hit rate statistics are reset at the beginning of each epoch. This API call allows you to do the same thing from your program.</p>
<p>The adaptive cache resizing code may behave oddly if you use this call when adaptive cache resizing is enabled. However, the call should be useful if you choose to control metadata cache size from your program.</p>
<p>See <a href="https://portal.hdfgroup.org/display/HDF5/Metadata+Caching+in+HDF5">Metadata Caching in HDF5</a> for details about the metadata cache and the adaptive cache resizing algorithms. If you have not read, understood, and thought about the material covered in that documentation, you should not be using this API call. </p>
</div>
</div>
<a id="ga81bc06be69131484eb04d01511b9c8f8"></a>
<h2 class="memtitle"><span class="permalink"><a href="#ga81bc06be69131484eb04d01511b9c8f8">◆ </a></span>H5Fset_mdc_config()</h2>
<div class="memitem">
<div class="memproto">
<table class="memname">
<tr>
<td class="memname"><a class="el" href="_h5public_8h.html#a3b079ecf932a5c599499cf7e298af160">herr_t</a> H5Fset_mdc_config </td>
<td>(</td>
<td class="paramtype"><a class="el" href="_h5_ipublic_8h.html#a0045db7ff9c22ad35db6ae91662e1943">hid_t</a> </td>
<td class="paramname"><em>file_id</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">const <a class="el" href="struct_h5_a_c__cache__config__t.html">H5AC_cache_config_t</a> * </td>
<td class="paramname"><em>config_ptr</em> </td>
</tr>
<tr>
<td></td>
<td>)</td>
<td></td><td></td>
</tr>
</table>
</div><div class="memdoc">
<p>Attempts to configure metadata cache of target file. </p>
<dl class="params"><dt>Parameters</dt><dd>
<table class="params">
<tr><td class="paramdir">[in]</td><td class="paramname">file_id</td><td>File identifier </td></tr>
<tr><td class="paramdir">[in,out]</td><td class="paramname">config_ptr</td><td>Pointer to the <a class="el" href="struct_h5_a_c__cache__config__t.html">H5AC_cache_config_t</a> instance containing the desired configuration. The fields of this structure are discussed <a class="el" href="_h5_a_c-cache-config-t.html">here</a>. </td></tr>
</table>
</dd>
</dl>
<dl class="section return"><dt>Returns</dt><dd>Returns a non-negative value if successful; otherwise, returns a negative value.</dd></dl>
<p><a class="el" href="group___m_d_c.html#ga81bc06be69131484eb04d01511b9c8f8" title="Attempts to configure metadata cache of target file.">H5Fset_mdc_config()</a> attempts to configure the file's metadata cache according configuration supplied in <code>config_ptr</code>. </p><div class="fragment"><div class="line"><span class="keyword">typedef</span> <span class="keyword">struct </span><a class="code" href="struct_h5_a_c__cache__config__t.html">H5AC_cache_config_t</a> {</div>
<div class="line"> <span class="comment">/* general configuration fields: */</span></div>
<div class="line"> <span class="keywordtype">int</span> <a class="code" href="struct_h5_a_c__cache__config__t.html#aad880fc4455c253781e8968f2239d56f">version</a>;</div>
<div class="line"> <a class="code" href="_h5public_8h.html#ad470b00eccd2115c707c02de5fa1120d">hbool_t</a> <a class="code" href="struct_h5_a_c__cache__config__t.html#aab04b3e770d1c2decc03f6fd94b64b17">rpt_fcn_enabled</a>;</div>
<div class="line"> <a class="code" href="_h5public_8h.html#ad470b00eccd2115c707c02de5fa1120d">hbool_t</a> <a class="code" href="struct_h5_a_c__cache__config__t.html#a6c03d051d5efb0e64bdca5d0b354a8b1">open_trace_file</a>;</div>
<div class="line"> <a class="code" href="_h5public_8h.html#ad470b00eccd2115c707c02de5fa1120d">hbool_t</a> <a class="code" href="struct_h5_a_c__cache__config__t.html#aced3486ae892a53209b7aae069a34be9">close_trace_file</a>;</div>
<div class="line"> <span class="keywordtype">char</span> <a class="code" href="struct_h5_a_c__cache__config__t.html#a92e7d20eb2b7b353961c64558ddac080">trace_file_name</a>[<a class="code" href="_h5_a_cpublic_8h.html#a717f1f3545cfc3d1b2208c96cc0c3bd3">H5AC__MAX_TRACE_FILE_NAME_LEN</a> + 1];</div>
<div class="line"> <a class="code" href="_h5public_8h.html#ad470b00eccd2115c707c02de5fa1120d">hbool_t</a> <a class="code" href="struct_h5_a_c__cache__config__t.html#a3d6e32c7a9bf8f65848c6840e1de8c6e">evictions_enabled</a>;</div>
<div class="line"> <a class="code" href="_h5public_8h.html#ad470b00eccd2115c707c02de5fa1120d">hbool_t</a> <a class="code" href="struct_h5_a_c__cache__config__t.html#a707198a337ece01a37dfec6e01275d82">set_initial_size</a>;</div>
<div class="line"> <span class="keywordtype">size_t</span> <a class="code" href="struct_h5_a_c__cache__config__t.html#a649236e7dd714855a50f122aa5caca9f">initial_size</a>;</div>
<div class="line"> <span class="keywordtype">double</span> <a class="code" href="struct_h5_a_c__cache__config__t.html#abd805b98f873c1720f34a0ce937838fd">min_clean_fraction</a>;</div>
<div class="line"> <span class="keywordtype">size_t</span> <a class="code" href="struct_h5_a_c__cache__config__t.html#af4728438dee601cb2554d9bf18d78a43">max_size</a>;</div>
<div class="line"> <span class="keywordtype">size_t</span> <a class="code" href="struct_h5_a_c__cache__config__t.html#af99ca22b80e05fd5b3603806348ab647">min_size</a>;</div>
<div class="line"> <span class="keywordtype">long</span> <span class="keywordtype">int</span> <a class="code" href="struct_h5_a_c__cache__config__t.html#ac998e51b01e0eef09d9a29c43f97e4bf">epoch_length</a>;</div>
<div class="line"> </div>
<div class="line"> <span class="comment">/* size increase control fields: */</span></div>
<div class="line"> <span class="keyword">enum</span> <a class="code" href="_h5_cpublic_8h.html#a040d488146ff1ca0a82209e9af3918fa">H5C_cache_incr_mode</a> <a class="code" href="struct_h5_a_c__cache__config__t.html#ae825aaf759060239e92170d20eb97d26">incr_mode</a>;</div>
<div class="line"> <span class="keywordtype">double</span> <a class="code" href="struct_h5_a_c__cache__config__t.html#a20f323fcb4747fc7228d2d74bb965586">lower_hr_threshold</a>;</div>
<div class="line"> <span class="keywordtype">double</span> <a class="code" href="struct_h5_a_c__cache__config__t.html#ac504dff76b24ab9f15536c51aec9fbbb">increment</a>;</div>
<div class="line"> <a class="code" href="_h5public_8h.html#ad470b00eccd2115c707c02de5fa1120d">hbool_t</a> <a class="code" href="struct_h5_a_c__cache__config__t.html#a322f2a955e71ab7ede483e991e76f806">apply_max_increment</a>;</div>
<div class="line"> <span class="keywordtype">size_t</span> <a class="code" href="struct_h5_a_c__cache__config__t.html#ad5a729f1d611f2780679a35b3524052c">max_increment</a>;</div>
<div class="line"> <span class="keyword">enum</span> <a class="code" href="_h5_cpublic_8h.html#aaaa13ca7756d135b7df6d5a6779ee908">H5C_cache_flash_incr_mode</a> <a class="code" href="struct_h5_a_c__cache__config__t.html#a0e25a1dc2c695bea335df0e23ed6363c">flash_incr_mode</a>;</div>
<div class="line"> <span class="keywordtype">double</span> <a class="code" href="struct_h5_a_c__cache__config__t.html#a77b1812e0407c9122db524462a5c9633">flash_multiple</a>;</div>
<div class="line"> <span class="keywordtype">double</span> <a class="code" href="struct_h5_a_c__cache__config__t.html#a95fb1e03a77ef5c109d0c851416ced55">flash_threshold</a>;</div>
<div class="line"> </div>
<div class="line"> <span class="comment">/* size decrease control fields: */</span></div>
<div class="line"> <span class="keyword">enum</span> <a class="code" href="_h5_cpublic_8h.html#a4f8534794ad9a977185a5d608c0af04f">H5C_cache_decr_mode</a> <a class="code" href="struct_h5_a_c__cache__config__t.html#a5df68196b281c19d8ab7da0788566aec">decr_mode</a>;</div>
<div class="line"> <span class="keywordtype">double</span> <a class="code" href="struct_h5_a_c__cache__config__t.html#a84a5ff4ac69196aa27c14f6f796db596">upper_hr_threshold</a>;</div>
<div class="line"> <span class="keywordtype">double</span> <a class="code" href="struct_h5_a_c__cache__config__t.html#a54007d3f2afb718b437f499a5c8b46d9">decrement</a>;</div>
<div class="line"> <a class="code" href="_h5public_8h.html#ad470b00eccd2115c707c02de5fa1120d">hbool_t</a> <a class="code" href="struct_h5_a_c__cache__config__t.html#ac2c89a735413e4c36d6f463c4890ab42">apply_max_decrement</a>;</div>
<div class="line"> <span class="keywordtype">size_t</span> <a class="code" href="struct_h5_a_c__cache__config__t.html#a75e875a61c9da7f82482d0f6fe6e7152">max_decrement</a>;</div>
<div class="line"> <span class="keywordtype">int</span> <a class="code" href="struct_h5_a_c__cache__config__t.html#a7ac41e345300bdecd9943e855d55b71b">epochs_before_eviction</a>;</div>
<div class="line"> <a class="code" href="_h5public_8h.html#ad470b00eccd2115c707c02de5fa1120d">hbool_t</a> <a class="code" href="struct_h5_a_c__cache__config__t.html#a6c5cff8e8a21230cc7f21859d8d6bd22">apply_empty_reserve</a>;</div>
<div class="line"> <span class="keywordtype">double</span> <a class="code" href="struct_h5_a_c__cache__config__t.html#a9c1ae995513b55737aad09e11beff733">empty_reserve</a>;</div>
<div class="line"> </div>
<div class="line"> <span class="comment">/* parallel configuration fields: */</span></div>
<div class="line"> <span class="keywordtype">size_t</span> <a class="code" href="struct_h5_a_c__cache__config__t.html#a8e3c2a2d300b7a8f8d3705fc5e59a3c1">dirty_bytes_threshold</a>;</div>
<div class="line"> <span class="keywordtype">int</span> <a class="code" href="struct_h5_a_c__cache__config__t.html#a83a536128dbb7785b2553c294f33d1fe">metadata_write_strategy</a>;</div>
<div class="line">} <a class="code" href="struct_h5_a_c__cache__config__t.html">H5AC_cache_config_t</a>;</div>
</div><!-- fragment --><p> (Click on a enumerator, field, or type for more information.)</p>
<dl class="section since"><dt>Since</dt><dd>1.8.0 </dd></dl>
</div>
</div>
<a id="ga378fb5863071278b47070cf205f53e67"></a>
<h2 class="memtitle"><span class="permalink"><a href="#ga378fb5863071278b47070cf205f53e67">◆ </a></span>H5Fstart_mdc_logging()</h2>
<div class="memitem">
<div class="memproto">
<table class="memname">
<tr>
<td class="memname"><a class="el" href="_h5public_8h.html#a3b079ecf932a5c599499cf7e298af160">herr_t</a> H5Fstart_mdc_logging </td>
<td>(</td>
<td class="paramtype"><a class="el" href="_h5_ipublic_8h.html#a0045db7ff9c22ad35db6ae91662e1943">hid_t</a> </td>
<td class="paramname"><em>file_id</em></td><td>)</td>
<td></td>
</tr>
</table>
</div><div class="memdoc">
<p>Starts logging metadata cache events if logging was previously enabled. </p>
<dl class="params"><dt>Parameters</dt><dd>
<table class="params">
<tr><td class="paramdir">[in]</td><td class="paramname">file_id</td><td>File identifier</td></tr>
</table>
</dd>
</dl>
<dl class="section return"><dt>Returns</dt><dd>Returns a non-negative value if successful; otherwise, returns a negative value.</dd></dl>
<p>The metadata cache is a central part of the HDF5 library through which all <em>file metadata</em> reads and writes take place. File metadata is normally invisible to the user and is used by the library for purposes such as locating and indexing data. File metadata should not be confused with user metadata, which consists of attributes created by users and attached to HDF5 objects such as datasets via H5A API calls.</p>
<p>Due to the complexity of the cache, a trace/logging feature has been created that can be used by HDF5 developers for debugging and performance analysis. The functions that control this functionality will normally be of use to a very limited number of developers outside of The HDF Group. The functions have been documented to help users create logs that can be sent with bug reports.</p>
<p>Control of the log functionality is straightforward. Logging is enabled via the <a class="el" href="group___f_a_p_l.html#ga4d7206c5679d7243410058eceae59b2c" title="Sets metadata cache logging options.">H5Pset_mdc_log_options()</a> function, which will modify the file access property list used to open or create a file. This function has a flag that determines whether logging begins at file open or starts in a paused state. Log messages can then be controlled via the <a class="el" href="group___m_d_c.html#ga378fb5863071278b47070cf205f53e67" title="Starts logging metadata cache events if logging was previously enabled.">H5Fstart_mdc_logging()</a> and <a class="el" href="group___m_d_c.html#ga78627b23010f82002b837f4d312bf234" title="Stops logging metadata cache events if logging was previously enabled and is currently ongoing.">H5Fstop_mdc_logging()</a> functions. <a class="el" href="group___f_a_p_l.html#gaa3a1ca6e294cc5074933239cc3d0e4a3" title="Gets metadata cache logging options.">H5Pget_mdc_log_options()</a> can be used to examine a file access property list, and <a class="el" href="group___m_d_c.html#ga998ebdc7b5190cf3d0fdf2fbe71e9780" title="Gets the current metadata cache logging status.">H5Fget_mdc_logging_status()</a> will return the current state of the logging flags.</p>
<p>The log format is described in the <a href="https://portal.hdfgroup.org/display/HDF5/H5F_START_MDC_LOGGING">Metadata Cache Logging</a> document.</p>
<dl class="section note"><dt>Note</dt><dd>Logging can only be started or stopped if metadata cache logging was enabled via <a class="el" href="group___f_a_p_l.html#ga4d7206c5679d7243410058eceae59b2c" title="Sets metadata cache logging options.">H5Pset_mdc_log_options()</a>.<br />
When enabled and currently logging, the overhead of the logging feature will almost certainly be significant.<br />
The log file is opened when the HDF5 file is opened or created and not when this function is called for the first time.<br />
This function opens the log file and starts logging metadata cache operations for a particular file. Calling this function when logging has already been enabled will be considered an error.</dd></dl>
<dl class="section since"><dt>Since</dt><dd>1.10.0 </dd></dl>
</div>
</div>
<a id="ga78627b23010f82002b837f4d312bf234"></a>
<h2 class="memtitle"><span class="permalink"><a href="#ga78627b23010f82002b837f4d312bf234">◆ </a></span>H5Fstop_mdc_logging()</h2>
<div class="memitem">
<div class="memproto">
<table class="memname">
<tr>
<td class="memname"><a class="el" href="_h5public_8h.html#a3b079ecf932a5c599499cf7e298af160">herr_t</a> H5Fstop_mdc_logging </td>
<td>(</td>
<td class="paramtype"><a class="el" href="_h5_ipublic_8h.html#a0045db7ff9c22ad35db6ae91662e1943">hid_t</a> </td>
<td class="paramname"><em>file_id</em></td><td>)</td>
<td></td>
</tr>
</table>
</div><div class="memdoc">
<p>Stops logging metadata cache events if logging was previously enabled and is currently ongoing. </p>
<dl class="params"><dt>Parameters</dt><dd>
<table class="params">
<tr><td class="paramdir">[in]</td><td class="paramname">file_id</td><td>File identifier</td></tr>
</table>
</dd>
</dl>
<dl class="section return"><dt>Returns</dt><dd>Returns a non-negative value if successful; otherwise, returns a negative value.</dd></dl>
<p>The metadata cache is a central part of the HDF5 library through which all <em>file metadata</em> reads and writes take place. File metadata is normally invisible to the user and is used by the library for purposes such as locating and indexing data. File metadata should not be confused with user metadata, which consists of attributes created by users and attached to HDF5 objects such as datasets via H5A API calls.</p>
<p>Due to the complexity of the cache, a trace/logging feature has been created that can be used by HDF5 developers for debugging and performance analysis. The functions that control this functionality will normally be of use to a very limited number of developers outside of The HDF Group. The functions have been documented to help users create logs that can be sent with bug reports.</p>
<p>Control of the log functionality is straightforward. Logging is enabled via the <a class="el" href="group___f_a_p_l.html#ga4d7206c5679d7243410058eceae59b2c" title="Sets metadata cache logging options.">H5Pset_mdc_log_options()</a> function, which will modify the file access property list used to open or create a file. This function has a flag that determines whether logging begins at file open or starts in a paused state. Log messages can then be controlled via the <a class="el" href="group___m_d_c.html#ga378fb5863071278b47070cf205f53e67" title="Starts logging metadata cache events if logging was previously enabled.">H5Fstart_mdc_logging()</a> and <a class="el" href="group___m_d_c.html#ga78627b23010f82002b837f4d312bf234" title="Stops logging metadata cache events if logging was previously enabled and is currently ongoing.">H5Fstop_mdc_logging()</a> functions. <a class="el" href="group___f_a_p_l.html#gaa3a1ca6e294cc5074933239cc3d0e4a3" title="Gets metadata cache logging options.">H5Pget_mdc_log_options()</a> can be used to examine a file access property list, and <a class="el" href="group___m_d_c.html#ga998ebdc7b5190cf3d0fdf2fbe71e9780" title="Gets the current metadata cache logging status.">H5Fget_mdc_logging_status()</a> will return the current state of the logging flags.</p>
<p>The log format is described in the <a href="https://portal.hdfgroup.org/display/HDF5/H5F_START_MDC_LOGGING">Metadata Cache Logging</a> document.</p>
<dl class="section note"><dt>Note</dt><dd>Logging can only be started or stopped if metadata cache logging was enabled via <a class="el" href="group___f_a_p_l.html#ga4d7206c5679d7243410058eceae59b2c" title="Sets metadata cache logging options.">H5Pset_mdc_log_options()</a>.<br />
This function only suspends the logging operations. The log file will remain open and will not be closed until the HDF5 file is closed.</dd></dl>
<dl class="section since"><dt>Since</dt><dd>1.10.0 </dd></dl>
</div>
</div>
</div><!-- contents -->
</div><!-- doc-content -->
<!-- start footer part -->
<div id="nav-path" class="navpath"><!-- id is needed for treeview function! -->
<ul>
<li class="footer">Generated by
<a href="http://www.doxygen.org/index.html">
<img class="footer" src="doxygen.png" alt="doxygen"/></a> 1.9.1 </li>
</ul>
</div>
</body>
</html>
|
