From: Massimo Dal Zotto <dz@cs.unitn.it>
> sinval.patch > > fixes a problem in SI cache which causes table overflow if some > backend is idle for a long time while other backends keep adding > entries. > It uses the new signal handling implemented in tprintf.patch. > I have also increacasesed the max number of backends from 32 to 64 > and the table size from 1000 to 5000. > I don't know if anybody is working on SI, but until another > solution is found this patch fixes the problem. I have received > messages from other people reporting the same problem which I > fixed many months ago.
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3 changed files with 23 additions and 8 deletions
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@ -7,7 +7,7 @@
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*
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*
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* IDENTIFICATION
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* $Header: /cvsroot/pgsql/src/backend/storage/ipc/sinval.c,v 1.10 1998/06/15 19:29:15 momjian Exp $
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* $Header: /cvsroot/pgsql/src/backend/storage/ipc/sinval.c,v 1.11 1998/08/25 21:31:17 scrappy Exp $
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*
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*-------------------------------------------------------------------------
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*/
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@ -157,8 +157,7 @@ RegisterSharedInvalid(int cacheId, /* XXX */
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/* should be called by a backend */
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/****************************************************************************/
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void
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InvalidateSharedInvalid(void (*invalFunction) (),
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void (*resetFunction) ())
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InvalidateSharedInvalid(void (*invalFunction) (), void (*resetFunction) ())
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{
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SpinAcquire(SInvalLock);
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SIReadEntryData(shmInvalBuffer, MyBackendId,
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@ -7,11 +7,13 @@
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*
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*
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* IDENTIFICATION
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* $Header: /cvsroot/pgsql/src/backend/storage/ipc/sinvaladt.c,v 1.12 1998/07/13 16:34:49 momjian Exp $
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* $Header: /cvsroot/pgsql/src/backend/storage/ipc/sinvaladt.c,v 1.13 1998/08/25 21:31:18 scrappy Exp $
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*
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*-------------------------------------------------------------------------
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*/
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#include <stdio.h>
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#include <signal.h>
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#include <unistd.h>
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#include "postgres.h"
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@ -20,6 +22,7 @@
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#include "storage/sinvaladt.h"
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#include "storage/lmgr.h"
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#include "utils/palloc.h"
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#include "utils/trace.h"
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/* ----------------
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* global variable notes
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@ -357,6 +360,19 @@ SIGetProcStateLimit(SISeg *segP, int i)
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static bool
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SIIncNumEntries(SISeg *segP, int num)
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{
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/*
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* Try to prevent table overflow. When the table is 70% full send
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* a SIGUSR2 to the postmaster which will send it back to all the
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* backends. This will be handled by Async_NotifyHandler() with a
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* StartTransactionCommand() which will flush unread SI entries for
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* each backend. dz - 27 Jan 1998
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*/
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if (segP->numEntries == (MAXNUMMESSAGES * 70 / 100)) {
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TPRINTF(TRACE_VERBOSE,
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"SIIncNumEntries: table is 70%% full, signaling postmaster");
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kill(getppid(), SIGUSR2);
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}
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if ((segP->numEntries + num) <= MAXNUMMESSAGES)
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{
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segP->numEntries = segP->numEntries + num;
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@ -655,7 +671,7 @@ SIReadEntryData(SISeg *segP,
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else
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{
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/* backend must not read messages, its own state has to be reset */
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elog(NOTICE, "SIMarkEntryData: cache state reset");
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elog(NOTICE, "SIReadEntryData: cache state reset");
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resetFunction(); /* XXXX call it here, parameters? */
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/* new valid state--mark all messages "read" */
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@ -6,7 +6,7 @@
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*
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* Copyright (c) 1994, Regents of the University of California
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*
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* $Id: sinvaladt.h,v 1.8 1998/02/26 04:43:35 momjian Exp $
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* $Id: sinvaladt.h,v 1.9 1998/08/25 21:31:20 scrappy Exp $
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*
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*-------------------------------------------------------------------------
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*/
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@ -44,8 +44,8 @@ C----------------End shared segment -------
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*/
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/* Parameters (configurable) *******************************************/
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#define MaxBackendId 32 /* maximum number of backends */
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#define MAXNUMMESSAGES 1000 /* maximum number of messages in seg */
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#define MaxBackendId 64 /* maximum number of backends */
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#define MAXNUMMESSAGES 4000 /* maximum number of messages in seg */
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#define InvalidOffset 1000000000 /* a invalid offset (End of
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