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Reimplement free-space-map management as per recent discussions.

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Adjustable threshold is gone in favor of keeping track of total requested
page storage and doling out proportional fractions to each relation
(with a minimum amount per relation, and some quantization of the results
to avoid thrashing with small changes in page counts).  Provide special-
case code for indexes so as not to waste space storing useless page
free space counts.  Restructure internal data storage to be a flat array
instead of list-of-chunks; this may cost a little more work in data
copying when reorganizing, but allows binary search to be used during
lookup_fsm_page_entry().
This commit is contained in:
Tom Lane
2003-03-04 21:51:22 +00:00
parent a455c94257
commit 391eb5e5b6
10 changed files with 1165 additions and 741 deletions
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6
src/backend/utils/misc/guc.c
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@@ -5,7 +5,7 @@
* command, configuration file, and command line options.
* See src/backend/utils/misc/README for more information.
*
* $Header: /cvsroot/pgsql/src/backend/utils/misc/guc.c,v 1.115 2003/02/23 23:27:21 tgl Exp $
* $Header: /cvsroot/pgsql/src/backend/utils/misc/guc.c,v 1.116 2003/03/04 21:51:21 tgl Exp $
*
* Copyright 2000 by PostgreSQL Global Development Group
* Written by Peter Eisentraut <peter_e@gmx.net>.
@@ -644,11 +644,11 @@ static struct config_int
{
{"max_fsm_relations", PGC_POSTMASTER}, &MaxFSMRelations,
1000, 10, INT_MAX, NULL, NULL
1000, 100, INT_MAX, NULL, NULL
},
{
{"max_fsm_pages", PGC_POSTMASTER}, &MaxFSMPages,
10000, 1000, INT_MAX, NULL, NULL
20000, 1000, INT_MAX, NULL, NULL
},
{

5
src/backend/utils/misc/postgresql.conf.sample
View File

@@ -48,10 +48,11 @@
# Shared Memory Size
#
#shared_buffers = 64 # min max_connections*2 or 16, 8KB each
#max_fsm_relations = 1000 # min 10, fsm is free space map, ~40 bytes
#max_fsm_pages = 10000 # min 1000, fsm is free space map, ~6 bytes
#max_locks_per_transaction = 64 # min 10
#wal_buffers = 8 # min 4, typically 8KB each
# fsm = free space map
#max_fsm_relations = 1000 # min 100, ~50 bytes each
#max_fsm_pages = 20000 # min max_fsm_relations*16, 6 bytes each
#
# Non-shared Memory Sizes