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| author | lrknox <lrknox@users.noreply.github.com> | 2023-08-25 00:47:17 (GMT) |
|---|---|---|
| committer | lrknox <lrknox@users.noreply.github.com> | 2023-08-25 00:47:17 (GMT) |
| commit | 4d4e861b81f2c52c6e36c364c3a33abdb4be988c (patch) | |
| tree | 52dab02190cb018f6387c431b8e5d80dbee31a35 /_intro_par_chunk.html | |
| parent | 05c14f02e9d455692b23d9eee9b403e117239190 (diff) | |
| download | hdf5-4d4e861b81f2c52c6e36c364c3a33abdb4be988c.zip hdf5-4d4e861b81f2c52c6e36c364c3a33abdb4be988c.tar.gz hdf5-4d4e861b81f2c52c6e36c364c3a33abdb4be988c.tar.bz2 | |
deploy: 1d79445a1d85a11a35accb1ac6c7fd15c7fb0816
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diff --git a/_intro_par_chunk.html b/_intro_par_chunk.html new file mode 100644 index 0000000..7c09f40 --- /dev/null +++ b/_intro_par_chunk.html @@ -0,0 +1,191 @@ +<!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: Writing by Chunk</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">1.15.0.1d79445</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('_intro_par_chunk.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="PageDoc"><div class="header"> + <div class="headertitle"> +<div class="title">Writing by Chunk </div> </div> +</div><!--header--> +<div class="contents"> +<div class="textblock"><p>Navigate back: <a class="el" href="index.html">Main</a> / <a class="el" href="_getting_started.html">Getting Started with HDF5</a> / <a class="el" href="_intro_par_h_d_f5.html">A Brief Introduction to Parallel HDF5</a> </p><hr /> +<p>In this example each process writes a "chunk" of data to a dataset. The C and Fortran 90 examples result in the same data layout in the file.</p> +<table class="doxtable"> +<tr> +<th><b>Figure a</b> C Example </th><th><b>Figure b</b> Fortran Example </th></tr> +<tr> +<td><div class="image"> +<img src="pchunk_figa.gif" alt=""/> +</div> + </td><td><div class="image"> +<img src="pchunk_figb.gif" alt=""/> +</div> + </td></tr> +</table> +<p>For this example, four processes are used, and a 4 x 2 chunk is written to the dataset by each process.</p> +<p>To do this, you would: </p><ul> +<li>Use the block parameter to specify a chunk of size 4 x 2 (or 2 x 4 for Fortran). </li> +<li>Use a different offset (start) for each process, based on the chunk size: <table class="doxtable"> +<tr> +<th rowspan="3"><b>C</b></th><th>Process 0</th><th>Process 1</th><th>Process 2</th><th>Process 3 </th></tr> +<tr> +<td>offset[0] = 0</td><td>offset[0] = 0</td><td>offset[0] = 4</td><td>offset[0] = 4 </td></tr> +<tr> +<td>offset[1] = 0</td><td>offset[1] = 2</td><td>offset[1] = 0</td><td>offset[1] = 2 </td></tr> +<tr> +<th rowspan="3"><b>Fortran</b></th><th>Process 0</th><th>Process 1</th><th>Process 2</th><th>Process 3 </th></tr> +<tr> +<td>offset(1) = 0</td><td>offset(1) = 2</td><td>offset(1) = 0</td><td>offset(1) = 2 </td></tr> +<tr> +<td>offset(2) = 0</td><td>offset(2) = 0</td><td>offset(2) = 4</td><td>offset(2) = 4 </td></tr> +</table> +</li> +</ul> +<p>For example, the offset and block parameters for Process 2 would look like: </p><table class="doxtable"> +<tr> +<th><b>Figure a</b> C Example </th><th><b>Figure b</b> Fortran Example </th></tr> +<tr> +<td><div class="image"> +<img src="pchunk_figc.gif" alt=""/> +</div> + </td><td><div class="image"> +<img src="pchunk_figd.gif" alt=""/> +</div> + </td></tr> +</table> +<p>Below are example programs for writing hyperslabs by pattern in Parallel HDF5: </p><table class="doxtable"> +<tr> +<td><a href="https://github.com/HDFGroup/hdf5-examples/blob/master/C/H5Parallel/ph5_hyperslab_by_chunk.c">hyperslab_by_chunk.c</a> </td></tr> +<tr> +<td><a href="https://github.com/HDFGroup/hdf5-examples/blob/master/Fortran/H5Parallel/ph5_f90_hyperslab_by_chunk.f90">hyperslab_by_chunk.f90</a> </td></tr> +</table> +<p>The following is the output from h5dump for the HDF5 file created in this example: </p><div class="fragment"><div class="line">HDF5 <span class="stringliteral">"SDS_chnk.h5"</span> {</div> +<div class="line">GROUP <span class="stringliteral">"/"</span> {</div> +<div class="line"> DATASET <span class="stringliteral">"IntArray"</span> {</div> +<div class="line"> DATATYPE <a class="code" href="group___p_d_t_s_t_d.html#ga37e8a6be7ee64587c2a282b965019bb8">H5T_STD_I32BE</a> </div> +<div class="line"> DATASPACE SIMPLE { ( 8, 4 ) / ( 8, 4 ) } </div> +<div class="line"> DATA {</div> +<div class="line"> 1, 1, 2, 2,</div> +<div class="line"> 1, 1, 2, 2,</div> +<div class="line"> 1, 1, 2, 2,</div> +<div class="line"> 1, 1, 2, 2,</div> +<div class="line"> 3, 3, 4, 4,</div> +<div class="line"> 3, 3, 4, 4,</div> +<div class="line"> 3, 3, 4, 4,</div> +<div class="line"> 3, 3, 4, 4</div> +<div class="line"> } </div> +<div class="line"> } </div> +<div class="line">} </div> +<div class="line">} </div> +<div class="ttc" id="agroup___p_d_t_s_t_d_html_ga37e8a6be7ee64587c2a282b965019bb8"><div class="ttname"><a href="group___p_d_t_s_t_d.html#ga37e8a6be7ee64587c2a282b965019bb8">H5T_STD_I32BE</a></div><div class="ttdeci">#define H5T_STD_I32BE</div><div class="ttdef"><b>Definition:</b> H5Tpublic.h:305</div></div> +</div><!-- fragment --><p> The h5dump utility is written in C so the output is in C order.</p> +<hr /> +<p> Navigate back: <a class="el" href="index.html">Main</a> / <a class="el" href="_getting_started.html">Getting Started with HDF5</a> / <a class="el" href="_intro_par_h_d_f5.html">A Brief Introduction to Parallel HDF5</a> </p> +</div></div><!-- contents --> +</div><!-- PageDoc --> +</div><!-- doc-content --> +<!-- start footer part --> +<div id="nav-path" class="navpath"><!-- id is needed for treeview function! --> + <ul> + <li class="footer">Generated on Fri Aug 25 2023 00:29:55 for HDF5 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> |