When flushing, the metadata cache attempts to flush entries in increasing

address order.  To facilitate this, the metadata cache needs a list of
of dirty entries in increasing address order.  This is implemented via a
skip list of all dirty entries in the cache.

To date this skip list has been maintained at all times.

However, profiling indicates that we can avoid significant overhead by
constructing the skip list of dirty entries just before a flush, taking
it down afterwareds, and not maintaining it during normal operation.

This commit implements this optimization for both serial and parallel.

Tested serial and parallel, debug and production on charis and jelly.

1 files changed, 4 insertions, 1 deletions

diff --git a/src/H5Cprivate.h b/src/H5Cprivate.h
index 0ba0234..cdccb4f 100644
--- a/src/H5Cprivate.h
+++ b/src/H5Cprivate.h
@@ -2288,7 +2288,10 @@ H5_DLL herr_t H5C_resize_entry(void *thing, size_t new_size);
 H5_DLL herr_t H5C_set_cache_auto_resize_config(H5C_t *cache_ptr, H5C_auto_size_ctl_t *config_ptr);
 H5_DLL herr_t H5C_set_cache_image_config(const H5F_t *f, H5C_t *cache_ptr,
     H5C_cache_image_ctl_t *config_ptr);
-H5_DLL herr_t H5C_set_evictions_enabled(H5C_t *cache_ptr, hbool_t evictions_enabled);
+H5_DLL herr_t H5C_set_evictions_enabled(H5C_t *cache_ptr, 
+    hbool_t evictions_enabled);
+H5_DLL herr_t H5C_set_slist_enabled(H5C_t *cache_ptr, hbool_t slist_enabled,
+    hbool_t clear_slist);
 H5_DLL herr_t H5C_set_prefix(H5C_t *cache_ptr, char *prefix);
 H5_DLL herr_t H5C_stats(H5C_t *cache_ptr, const char *cache_name,
     hbool_t display_detailed_stats);