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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
View File

@ -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

38
src/backend/storage/ipc/procarray.c
View File

@ -23,7 +23,7 @@
*
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/storage/ipc/procarray.c,v 1.11 2006/03/05 15:58:37 momjian Exp $
* $PostgreSQL: pgsql/src/backend/storage/ipc/procarray.c,v 1.12 2006/06/19 01:51:21 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -732,42 +732,6 @@ IsBackendPid(int pid)
return (BackendPidGetProc(pid) != NULL);
}
/*
* GetAllBackendPids -- get an array of all current backends' PIDs
*
* The result is a palloc'd array with the number of active backends in
* entry [0], their PIDs in entries [1] .. [n]. The caller must bear in
* mind that the result may already be obsolete when returned.
*/
int *
GetAllBackendPids(void)
{
int *result;
int npids;
ProcArrayStruct *arrayP = procArray;
int index;
result = (int *) palloc((MaxBackends + 1) * sizeof(int));
npids = 0;
LWLockAcquire(ProcArrayLock, LW_SHARED);
for (index = 0; index < arrayP->numProcs; index++)
{
PGPROC *proc = arrayP->procs[index];
if (proc->pid != 0) /* ignore dummy procs */
result[++npids] = proc->pid;
}
LWLockRelease(ProcArrayLock);
Assert(npids <= MaxBackends);
result[0] = npids;
return result;
}
/*
* CountActiveBackends --- count backends (other than myself) that are in
* active transactions. This is used as a heuristic to decide if