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Rearrange backend startup sequence so that ShmemIndexLock can become

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an LWLock instead of a spinlock.  This hardly matters on Unix machines
but should improve startup performance on Windows (or any port using
EXEC_BACKEND).  Per previous discussion.
This commit is contained in:
Tom Lane
2006-01-04 21:06:32 +00:00
parent e0078ea22d
commit 349f40b2c2
15 changed files with 414 additions and 259 deletions
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45
src/backend/postmaster/pgstat.c
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@@ -13,7 +13,7 @@
*
* Copyright (c) 2001-2005, PostgreSQL Global Development Group
*
* $PostgreSQL: pgsql/src/backend/postmaster/pgstat.c,v 1.118 2006/01/03 19:54:08 momjian Exp $
* $PostgreSQL: pgsql/src/backend/postmaster/pgstat.c,v 1.119 2006/01/04 21:06:31 tgl Exp $
* ----------
*/
#include "postgres.h"
@@ -147,6 +147,7 @@ static int pgStatNumBackends = 0;
static volatile bool need_statwrite;
/* ----------
* Local function forward declarations
* ----------
@@ -608,6 +609,9 @@ pgstat_start(void)
/* Close the postmaster's sockets */
ClosePostmasterPorts(false);
/* Lose the postmaster's on-exit routines */
on_exit_reset();
/* Drop our connection to postmaster's shared memory, as well */
PGSharedMemoryDetach();
@@ -1465,9 +1469,6 @@ PgstatBufferMain(int argc, char *argv[])
MyProcPid = getpid(); /* reset MyProcPid */
/* Lose the postmaster's on-exit routines */
on_exit_reset();
/*
* Ignore all signals usually bound to some action in the postmaster,
* except for SIGCHLD and SIGQUIT --- see pgstat_recvbuffer.
@@ -1551,10 +1552,10 @@ PgstatCollectorMain(int argc, char *argv[])
fd_set rfds;
int readPipe;
int len = 0;
struct itimerval timeval;
struct itimerval timeout;
HASHCTL hash_ctl;
bool need_timer = false;
MyProcPid = getpid(); /* reset MyProcPid */
/*
@@ -1597,11 +1598,15 @@ PgstatCollectorMain(int argc, char *argv[])
init_ps_display("stats collector process", "", "");
set_ps_display("");
/*
* Arrange to write the initial status file right away
*/
need_statwrite = true;
MemSet(&timeval, 0, sizeof(struct itimerval));
timeval.it_value.tv_sec = PGSTAT_STAT_INTERVAL / 1000;
timeval.it_value.tv_usec = PGSTAT_STAT_INTERVAL % 1000;
/* Preset the delay between status file writes */
MemSet(&timeout, 0, sizeof(struct itimerval));
timeout.it_value.tv_sec = PGSTAT_STAT_INTERVAL / 1000;
timeout.it_value.tv_usec = PGSTAT_STAT_INTERVAL % 1000;
/*
* Read in an existing statistics stats file or initialize the stats to
@@ -1634,6 +1639,12 @@ PgstatCollectorMain(int argc, char *argv[])
*/
for (;;)
{
/*
* If time to write the stats file, do so. Note that the alarm
* interrupt isn't re-enabled immediately, but only after we next
* receive a stats message; so no cycles are wasted when there is
* nothing going on.
*/
if (need_statwrite)
{
pgstat_write_statsfile();
@@ -1776,11 +1787,16 @@ PgstatCollectorMain(int argc, char *argv[])
*/
pgStatNumMessages++;
/*
* If this is the first message after we wrote the stats file the
* last time, enable the alarm interrupt to make it be written
* again later.
*/
if (need_timer)
{
if (setitimer(ITIMER_REAL, &timeval, NULL))
if (setitimer(ITIMER_REAL, &timeout, NULL))
ereport(ERROR,
(errmsg("unable to set statistics collector timer: %m")));
(errmsg("could not set statistics collector timer: %m")));
need_timer = false;
}
}
@@ -1806,6 +1822,7 @@ PgstatCollectorMain(int argc, char *argv[])
}
/* SIGALRM signal handler for collector process */
static void
force_statwrite(SIGNAL_ARGS)
{
@@ -1913,8 +1930,10 @@ pgstat_recvbuffer(void)
/*
* Wait for some work to do; but not for more than 10 seconds. (This
* determines how quickly we will shut down after an ungraceful
* postmaster termination; so it needn't be very fast.) struct timeout
* is modified by some operating systems.
* postmaster termination; so it needn't be very fast.)
*
* struct timeout is modified by select() on some operating systems,
* so re-fill it each time.
*/
timeout.tv_sec = 10;
timeout.tv_usec = 0;