Allocate HEAP blocks in smaller blocks to get better memory utilization and more speed when used with safemalloc.

Don't initalize memory areas when run with --skip-safemalloc.


Docs/manual.texi:
  ChangeLog
heap/heapdef.h:
  Allocate HEAP blocks in smaller blocks to get better memory utilization and more speed when used with safemalloc.
heap/hp_open.c:
  Allocate HEAP blocks in smaller blocks to get better memory utilization and more speed when used with safemalloc.
mysys/safemalloc.c:
  Don't initalize memory areas when run with --skip-safemalloc.
  This can in some cases increase speed with 20 times when debugging

1 files changed, 11 insertions, 0 deletions

diff --git a/heap/heapdef.h b/heap/heapdef.h
index 938cb55c0eb..6b85e234c5e 100644
--- a/heap/heapdef.h
+++ b/heap/heapdef.h
@@ -22,6 +22,17 @@
 #endif
 #include "heap.h"			/* Structs & some defines */
 
+/*
+  When allocating keys /rows in the internal block structure, do it
+  within the following boundaries.
+
+  The challenge is to find the balance between allocate as few blocks
+  as possible and keep memory consumption down.
+*/
+
+#define HP_MIN_RECORDS_IN_BLOCK 16
+#define HP_MAX_RECORDS_IN_BLOCK 8192
+
 	/* Some extern variables */
 
 extern LIST *heap_open_list,*heap_share_list;