[svn-r8791] Purpose: Rewrote metadata cache (H5AC.c, etc.) to improve performance.

Description:

Replaced the old metadata cache with a cache with a modified LRU
replacement policy.  This should improve the hit rate.

Solution:

Since we want to flush cache entries in increasing address order, I
used the threaded binary B-tree code to store the cache entries.
There is a fair bit of overhead here, so we may want to consider
other options.

While the code is designed to allow the support of other replacement
algorithms, at present, only a modified version of LRU is supported.

The modified LRU algorithm requires that a user selectable portion
of the cache entries be clean.  The clean entries are evicted first
when writes are not permitted.  If the pool of clean entries is used
up, the cache grows beyond its user specified maximum size.  The
cache can also exceed its maximum size if the combined size of the
protected (or locked) entries exceeds the maximum size of the cache.


Platforms tested:

eirene (serial, parallel, fp), h5committested


Misc. update:

1 files changed, 29 insertions, 0 deletions

diff --git a/src/H5E.c b/src/H5E.c
index 5128aa8..8ac0a86 100644
--- a/src/H5E.c
+++ b/src/H5E.c
@@ -120,6 +120,35 @@ static herr_t  H5E_walk_cb(unsigned n, const H5E_error_t *err_desc, void *client
 static herr_t  H5E_get_auto(const H5E_t *estack, H5E_auto_t *func, void **client_data);
 static herr_t  H5E_set_auto(H5E_t *estack, H5E_auto_t func, void *client_data);
 
+
+/*-------------------------------------------------------------------------
+ * Function:	H5E_init
+ *
+ * Purpose:	Initialize the interface from some other layer.
+ *
+ * Return:	Success:	non-negative
+ *
+ *		Failure:	negative
+ *
+ * Programmer:	Quincey Koziol
+ *              Tuesday, June 29, 2004
+ *
+ * Modifications:
+ *
+ *-------------------------------------------------------------------------
+ */
+herr_t
+H5E_init(void)
+{
+    herr_t ret_value=SUCCEED;   /* Return value */
+
+    FUNC_ENTER_NOAPI(H5E_init, FAIL)
+    /* FUNC_ENTER() does all the work */
+
+done:
+    FUNC_LEAVE_NOAPI(ret_value)
+}
+
 /*--------------------------------------------------------------------------
  * Function:    H5E_init_interface
  *