[svn-r14357] Description:

	Add a hack to the local heap code to resize the metadata cache when
the heap block will be too large for the cache.  This should be removed when
the metadata cache handles "too large" object insertions (or resizes) correctly.

Tested on:
        FreeBSD/32 6.2 (duty) in debug mode
        FreeBSD/64 6.2 (liberty) w/C++ & FORTRAN, in debug mode
        Linux/32 2.6 (kagiso) w/PGI compilers, w/C++ & FORTRAN, w/threadsafe,
                                in debug mode
        Linux/64-amd64 2.6 (smirom) w/default API=1.6.x, w/C++ & FORTRAN,
                                in production mode
        Linux/64-ia64 2.6 (cobalt) w/Intel compilers, w/C++ & FORTRAN,
                                in production mode
        Solaris/32 2.10 (linew) w/deprecated symbols disabled, w/C++ & FORTRAN,
                                w/szip filter, in production mode
        Mac OS X/32 10.4.10 (amazon) in debug mode
        Linux/64-ia64 2.4 (tg-login3) w/parallel, w/FORTRAN, in production mode

1 files changed, 35 insertions, 0 deletions

diff --git a/src/H5HL.c b/src/H5HL.c
index c861978..5d7b6f8 100644
--- a/src/H5HL.c
+++ b/src/H5HL.c
@@ -963,6 +963,41 @@ H5HL_insert(H5F_t *f, hid_t dxpl_id, H5HL_t *heap, size_t buf_size, const void *
             need_more = need_size;
 
 	new_heap_alloc = heap->heap_alloc + need_more;
+/*
+ * XXX: This is a _total_ hack, a real kludge. :-/  The metadata cache currently
+ *      responds very poorly when an object is inserted into the cache (or
+ *      resized) that is larger than the current cache size.  It waits through
+ *      an entire 'epoch' of cache operations to resize the cache larger (getting
+ *      _very_ poor performance), instead of immediately accommodating the large
+ *      object by increasing the cache size.
+ *
+ *      So, what we are doing here is to look at the current cache size, check
+ *      if the new local heap will overwhelm the cache and, if so, resize the
+ *      cache to be large enough to hold the new local heap block along with
+ *      leaving room for other objects in the cache.
+ *
+ *      John will be working on a fix inside the cache itself, so this special
+ *      case code here can be removed when he's finished.  - QAK, 2007/12/21
+ */
+{
+	H5AC_cache_config_t mdc_config;
+
+        /* Retrieve the current cache information */
+	mdc_config.version = H5AC__CURR_CACHE_CONFIG_VERSION;
+	if(H5AC_get_cache_auto_resize_config(f->shared->cache, &mdc_config) < 0)
+	    HGOTO_ERROR(H5E_CACHE, H5E_SYSTEM, (size_t)-1, "H5AC_get_cache_auto_resize_config() failed.")
+
+        /* Check if the current cache will get blown out by adding this heap
+         * block and resize it if so.
+         */
+	if((2 * new_heap_alloc) >= mdc_config.initial_size) {
+	    mdc_config.set_initial_size = TRUE;
+	    mdc_config.initial_size = 2 * new_heap_alloc;
+
+	    if(H5AC_set_cache_auto_resize_config(f->shared->cache, &mdc_config) < 0)
+	        HGOTO_ERROR(H5E_CACHE, H5E_SYSTEM, (size_t)-1, "H5AC_set_cache_auto_resize_config() failed.")
+        } /* end if */
+}
 	HDassert(heap->heap_alloc < new_heap_alloc);
 	H5_CHECK_OVERFLOW(heap->heap_alloc, size_t, hsize_t);
 	H5_CHECK_OVERFLOW(new_heap_alloc, size_t, hsize_t);