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Take the statistics collector out of the loop for monitoring backends'

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current commands; instead, store current-status information in shared
memory.  This substantially reduces the overhead of stats_command_string
and also ensures that pg_stat_activity is fully up to date at all times.
Per my recent proposal.
This commit is contained in:
Tom Lane
2006-06-19 01:51:22 +00:00
parent 6075feed40
commit b13c9686d0
11 changed files with 880 additions and 1198 deletions
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5
src/backend/storage/ipc/ipci.c
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@@ -8,7 +8,7 @@
*
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/storage/ipc/ipci.c,v 1.83 2006/05/08 00:00:10 tgl Exp $
* $PostgreSQL: pgsql/src/backend/storage/ipc/ipci.c,v 1.84 2006/06/19 01:51:21 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@@ -21,6 +21,7 @@
#include "access/twophase.h"
#include "access/xlog.h"
#include "miscadmin.h"
#include "pgstat.h"
#include "postmaster/bgwriter.h"
#include "postmaster/postmaster.h"
#include "storage/bufmgr.h"
@@ -86,6 +87,7 @@ CreateSharedMemoryAndSemaphores(bool makePrivate, int port)
size = add_size(size, MultiXactShmemSize());
size = add_size(size, LWLockShmemSize());
size = add_size(size, ProcArrayShmemSize());
size = add_size(size, BackendStatusShmemSize());
size = add_size(size, SInvalShmemSize());
size = add_size(size, FreeSpaceShmemSize());
size = add_size(size, BgWriterShmemSize());
@@ -167,6 +169,7 @@ CreateSharedMemoryAndSemaphores(bool makePrivate, int port)
if (!IsUnderPostmaster)
InitProcGlobal();
CreateSharedProcArray();
CreateSharedBackendStatus();
/*
* Set up shared-inval messaging