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Add a bit of debug logging to backend_read_statsfile().

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This is in hopes of learning more about what causes "pgstat wait timeout"
warnings in the buildfarm.  This patch should probably be reverted once
we've learned what we can.  As coded, it will result in regression test
"failures" at half the delay that the existing code does, so I expect
to see a few more than before.
This commit is contained in:
Tom Lane 2011-08-10 16:45:43 -04:00
parent 4dab3d5ae1
commit 79b2ee20c8
1 changed files with 25 additions and 4 deletions
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29
src/backend/postmaster/pgstat.c
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@ -3754,8 +3754,10 @@ pgstat_read_statsfile_timestamp(bool permanent, TimestampTz *ts)
static void
backend_read_statsfile(void)
{
TimestampTz cur_ts;
TimestampTz min_ts;
int count;
int last_delay_errno = 0;
/* already read it? */
if (pgStatDBHash)
@ -3776,12 +3778,11 @@ backend_read_statsfile(void)
* PGSTAT_STAT_INTERVAL; and we don't want to lie to the collector about
* what our cutoff time really is.
*/
cur_ts = GetCurrentTimestamp();
if (IsAutoVacuumWorkerProcess())
min_ts = TimestampTzPlusMilliseconds(GetCurrentTimestamp(),
-PGSTAT_RETRY_DELAY);
min_ts = TimestampTzPlusMilliseconds(cur_ts, -PGSTAT_RETRY_DELAY);
else
min_ts = TimestampTzPlusMilliseconds(GetCurrentTimestamp(),
-PGSTAT_STAT_INTERVAL);
min_ts = TimestampTzPlusMilliseconds(cur_ts, -PGSTAT_STAT_INTERVAL);
/*
* Loop until fresh enough stats file is available or we ran out of time.
@ -3798,9 +3799,29 @@ backend_read_statsfile(void)
file_ts >= min_ts)
break;
/* Make debugging printouts once we've waited unreasonably long */
if (count >= PGSTAT_POLL_LOOP_COUNT/2)
{
TimestampTz now_ts = GetCurrentTimestamp();
#ifdef HAVE_INT64_TIMESTAMP
elog(WARNING, "pgstat waiting for " INT64_FORMAT " usec (%d loops), file timestamp " INT64_FORMAT " target timestamp " INT64_FORMAT " last errno %d",
now_ts - cur_ts, count,
file_ts, min_ts,
last_delay_errno);
#else
elog(WARNING, "pgstat waiting for %.6f sec (%d loops), file timestamp %.6f target timestamp %.6f last errno %d",
now_ts - cur_ts, count,
file_ts, min_ts,
last_delay_errno);
#endif
}
/* Not there or too old, so kick the collector and wait a bit */
errno = 0;
pgstat_send_inquiry(min_ts);
pg_usleep(PGSTAT_RETRY_DELAY * 1000L);
last_delay_errno = errno;
}
if (count >= PGSTAT_POLL_LOOP_COUNT)