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Arrange to preallocate all required space for the buffer and FSM hash

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tables in shared memory.  This ensures that overflow of the lock table
creates no long-lasting problems.  Per discussion with Merlin Moncure.
This commit is contained in:
Tom Lane
2004-09-28 20:46:37 +00:00
parent d9b68c8061
commit 3a246cc285
6 changed files with 42 additions and 18 deletions
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13
src/backend/storage/ipc/shmem.c
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@@ -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 */