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Increase size of shared memory for pg_commit_ts

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Like 5364b357fb did for pg_commit, change the formula used to
determine number of pg_commit_ts buffers, which helps performance with
larger servers.

Discussion: https://postgr.es/m/20210115220744.GA24457@alvherre.pgsql
Reviewed-by: Noah Misch <noah@leadboat.com>
Reviewed-by: Tomas Vondra <tomas.vondra@enterprisedb.com>
This commit is contained in:
Alvaro Herrera
2021-11-30 14:29:31 -03:00
parent e7122548a3
commit 4c83e59e01
1 changed files with 4 additions and 3 deletions
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7
src/backend/access/transam/commit_ts.c
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@ -508,13 +508,14 @@ pg_xact_commit_timestamp_origin(PG_FUNCTION_ARGS)
/*
* Number of shared CommitTS buffers.
*
* We use a very similar logic as for the number of CLOG buffers; see comments
* in CLOGShmemBuffers.
* We use a very similar logic as for the number of CLOG buffers (except we
* scale up twice as fast with shared buffers, and the maximum is twice as
* high); see comments in CLOGShmemBuffers.
*/
Size
CommitTsShmemBuffers(void)
{
return Min(16, Max(4, NBuffers / 1024));
return Min(256, Max(4, NBuffers / 256));
}
/*