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[svn-r2157] Changed hashing scheme slightly to better spread out the hash values returned.

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This commit is contained in:
Quincey Koziol 2000-04-19 17:19:08 -05:00
parent 395326672c
commit 5999195011
2 changed files with 7 additions and 3 deletions
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3
src/H5AC.c
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@ -494,6 +494,7 @@ H5AC_set(H5F_t *f, const H5AC_class_t *type, haddr_t addr, void *thing)
}
#endif
if (slot->type) {
flush = slot->type->flush;
status = (flush)(f, TRUE, slot->addr, slot->thing);
@ -666,7 +667,7 @@ H5AC_protect(H5F_t *f, const H5AC_class_t *type, haddr_t addr,
cache->diagnostics[slot->type->id].nhits++;
thing = slot->thing;
slot->type = NULL;
slot->addr = HADDR_UNDEF;
slot->addr = HADDR_UNDEF;
slot->thing = NULL;
} else if (slot->type && H5F_addr_eq(slot->addr, addr)) {

7
src/H5ACprivate.h
View File

@ -71,8 +71,11 @@ typedef struct H5AC_class_t {
* cache entry by hashing the object's file address. Each file has its
* own cache, an array of slots.
*/
#define H5AC_NSLOTS 10330 /*prime number tend to work best */
#define H5AC_HASH(F,ADDR) H5F_addr_hash(ADDR,(F)->shared->cache->nslots)
#define H5AC_NSLOTS 10330 /* The library "likes" this number... */
#define H5AC_HASH_DIVISOR 8 /* Attempt to spread out the hashing */
/* This should be the same size as the alignment of */
/* of the smallest file format object written to the file. */
#define H5AC_HASH(F,ADDR) H5F_addr_hash((ADDR/H5AC_HASH_DIVISOR),(F)->shared->cache->nslots)
typedef struct H5AC_prot_t {
const H5AC_class_t *type; /*type of protected thing */