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Marginal hack to use a specialized hash function for dynahash hashtables

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whose keys are OIDs.  The only one that looks particularly performance
critical is the relcache hashtable, but as long as we've got the function
we may as well use it wherever it's applicable.
This commit is contained in:
Tom Lane
2005-04-14 20:32:43 +00:00
parent 162bd08b3f
commit 055467d504
6 changed files with 28 additions and 14 deletions
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6
src/backend/utils/cache/relcache.c vendored
View File

@@ -8,7 +8,7 @@
*
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/utils/cache/relcache.c,v 1.220 2005/04/14 20:03:26 tgl Exp $
* $PostgreSQL: pgsql/src/backend/utils/cache/relcache.c,v 1.221 2005/04/14 20:32:43 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@@ -1032,7 +1032,7 @@ LookupOpclassInfo(Oid operatorClassOid,
MemSet(&ctl, 0, sizeof(ctl));
ctl.keysize = sizeof(Oid);
ctl.entrysize = sizeof(OpClassCacheEnt);
ctl.hash = tag_hash;
ctl.hash = oid_hash;
OpClassCache = hash_create("Operator class cache", 64,
&ctl, HASH_ELEM | HASH_FUNCTION);
}
@@ -2151,7 +2151,7 @@ RelationCacheInitialize(void)
MemSet(&ctl, 0, sizeof(ctl));
ctl.keysize = sizeof(Oid);
ctl.entrysize = sizeof(RelIdCacheEnt);
ctl.hash = tag_hash;
ctl.hash = oid_hash;
RelationIdCache = hash_create("Relcache by OID", INITRELCACHESIZE,
&ctl, HASH_ELEM | HASH_FUNCTION);

4
src/backend/utils/cache/typcache.c vendored
View File

@@ -36,7 +36,7 @@
* Portions Copyright (c) 1994, Regents of the University of California
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/utils/cache/typcache.c,v 1.12 2005/04/14 20:03:26 tgl Exp $
* $PostgreSQL: pgsql/src/backend/utils/cache/typcache.c,v 1.13 2005/04/14 20:32:43 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@@ -123,7 +123,7 @@ lookup_type_cache(Oid type_id, int flags)
MemSet(&ctl, 0, sizeof(ctl));
ctl.keysize = sizeof(Oid);
ctl.entrysize = sizeof(TypeCacheEntry);
ctl.hash = tag_hash;
ctl.hash = oid_hash;
TypeCacheHash = hash_create("Type information cache", 64,
&ctl, HASH_ELEM | HASH_FUNCTION);
}

4
src/backend/utils/fmgr/fmgr.c
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@@ -8,7 +8,7 @@
*
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/utils/fmgr/fmgr.c,v 1.93 2005/03/31 22:46:16 tgl Exp $
* $PostgreSQL: pgsql/src/backend/utils/fmgr/fmgr.c,v 1.94 2005/04/14 20:32:43 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@@ -509,7 +509,7 @@ record_C_func(HeapTuple procedureTuple,
MemSet(&hash_ctl, 0, sizeof(hash_ctl));
hash_ctl.keysize = sizeof(Oid);
hash_ctl.entrysize = sizeof(CFuncHashTabEntry);
hash_ctl.hash = tag_hash;
hash_ctl.hash = oid_hash;
CFuncHash = hash_create("CFuncHash",
100,
&hash_ctl,

15
src/backend/utils/hash/hashfn.c
View File

@@ -9,7 +9,7 @@
*
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/utils/hash/hashfn.c,v 1.22 2004/12/31 22:01:37 pgsql Exp $
* $PostgreSQL: pgsql/src/backend/utils/hash/hashfn.c,v 1.23 2005/04/14 20:32:43 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@@ -40,3 +40,16 @@ tag_hash(const void *key, Size keysize)
return DatumGetUInt32(hash_any((const unsigned char *) key,
(int) keysize));
}
/*
* oid_hash: hash function for keys that are OIDs
*
* (tag_hash works for this case too, but is slower)
*/
uint32
oid_hash(const void *key, Size keysize)
{
Assert(keysize == sizeof(Oid));
/* We don't actually bother to do anything to the OID value ... */
return (uint32) *((const Oid *) key);
}