diff options
Diffstat (limited to 'src/backend/storage')
| -rw-r--r-- | src/backend/storage/freespace/freespace.c | 6 | ||||
| -rw-r--r-- | src/backend/storage/ipc/shmem.c | 13 | ||||
| -rw-r--r-- | src/backend/storage/lmgr/lock.c | 4 |
3 files changed, 16 insertions, 7 deletions
diff --git a/src/backend/storage/freespace/freespace.c b/src/backend/storage/freespace/freespace.c index 9def3df7483..7a7d204bf5f 100644 --- a/src/backend/storage/freespace/freespace.c +++ b/src/backend/storage/freespace/freespace.c @@ -8,7 +8,7 @@ * Portions Copyright (c) 1994, Regents of the University of California * * IDENTIFICATION - * $PostgreSQL: pgsql/src/backend/storage/freespace/freespace.c,v 1.34 2004/08/29 05:06:47 momjian Exp $ + * $PostgreSQL: pgsql/src/backend/storage/freespace/freespace.c,v 1.35 2004/09/28 20:46:27 tgl Exp $ * * * NOTES: @@ -283,8 +283,8 @@ InitFreeSpaceMap(void) info.hash = tag_hash; FreeSpaceMapRelHash = ShmemInitHash("Free Space Map Hash", - MaxFSMRelations / 10, - MaxFSMRelations, + MaxFSMRelations + 1, + MaxFSMRelations + 1, &info, (HASH_ELEM | HASH_FUNCTION)); diff --git a/src/backend/storage/ipc/shmem.c b/src/backend/storage/ipc/shmem.c index d9cd8850395..29ef5413c89 100644 --- a/src/backend/storage/ipc/shmem.c +++ b/src/backend/storage/ipc/shmem.c @@ -8,7 +8,7 @@ * * * IDENTIFICATION - * $PostgreSQL: pgsql/src/backend/storage/ipc/shmem.c,v 1.80 2004/08/29 05:06:48 momjian Exp $ + * $PostgreSQL: pgsql/src/backend/storage/ipc/shmem.c,v 1.81 2004/09/28 20:46:29 tgl Exp $ * *------------------------------------------------------------------------- */ @@ -262,8 +262,17 @@ InitShmemIndex(void) * shared memory hash table. * * We assume caller is doing some kind of synchronization - * so that two people dont try to create/initialize the + * so that two people don't try to create/initialize the * table at once. + * + * max_size is the estimated maximum number of hashtable entries. This is + * not a hard limit, but the access efficiency will degrade if it is + * exceeded substantially (since it's used to compute directory size and + * the hash table buckets will get overfull). + * + * init_size is the number of hashtable entries to preallocate. For a table + * whose maximum size is certain, this should be equal to max_size; that + * ensures that no run-time out-of-shared-memory failures can occur. */ HTAB * ShmemInitHash(const char *name, /* table string name for shmem index */ diff --git a/src/backend/storage/lmgr/lock.c b/src/backend/storage/lmgr/lock.c index f90a3fd0e84..9699469e6d3 100644 --- a/src/backend/storage/lmgr/lock.c +++ b/src/backend/storage/lmgr/lock.c @@ -8,7 +8,7 @@ * * * IDENTIFICATION - * $PostgreSQL: pgsql/src/backend/storage/lmgr/lock.c,v 1.140 2004/09/12 18:30:50 tgl Exp $ + * $PostgreSQL: pgsql/src/backend/storage/lmgr/lock.c,v 1.141 2004/09/28 20:46:32 tgl Exp $ * * NOTES * Outside modules can create a lock table and acquire/release @@ -241,7 +241,7 @@ LockMethodTableInit(const char *tabName, /* Compute init/max size to request for lock hashtables */ max_table_size = NLOCKENTS(maxBackends); - init_table_size = max_table_size / 10; + init_table_size = max_table_size / 2; /* Allocate a string for the shmem index table lookups. */ /* This is just temp space in this routine, so palloc is OK. */ |