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Instrument checkpoint sync calls.

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Greg Smith, reviewed by Jeff Janes
This commit is contained in:
Robert Haas
2010-12-14 09:25:25 -05:00
parent 9878e295dc
commit 34c70c7ac4
3 changed files with 79 additions and 6 deletions
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41
src/backend/access/transam/xlog.c
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@ -6953,10 +6953,15 @@ LogCheckpointEnd(bool restartpoint)
{
long write_secs,
sync_secs,
total_secs;
total_secs,
longest_secs,
average_secs;
int write_usecs,
sync_usecs,
total_usecs;
total_usecs,
longest_usecs,
average_usecs;
uint64 average_sync_time;
CheckpointStats.ckpt_end_t = GetCurrentTimestamp();
@ -6972,18 +6977,39 @@ LogCheckpointEnd(bool restartpoint)
CheckpointStats.ckpt_sync_end_t,
&sync_secs, &sync_usecs);
/*
* Timing values returned from CheckpointStats are in microseconds.
* Convert to the second plus microsecond form that TimestampDifference
* returns for homogeneous printing.
*/
longest_secs = (long) (CheckpointStats.ckpt_longest_sync / 1000000);
longest_usecs = CheckpointStats.ckpt_longest_sync -
(uint64) longest_secs * 1000000;
average_sync_time = 0;
if (CheckpointStats.ckpt_sync_rels > 0)
average_sync_time = CheckpointStats.ckpt_agg_sync_time /
CheckpointStats.ckpt_sync_rels;
average_secs = (long) (average_sync_time / 1000000);
average_usecs = average_sync_time - (uint64) average_secs * 1000000;
if (restartpoint)
elog(LOG, "restartpoint complete: wrote %d buffers (%.1f%%); "
"write=%ld.%03d s, sync=%ld.%03d s, total=%ld.%03d s",
"write=%ld.%03d s, sync=%ld.%03d s, total=%ld.%03d s; "
"sync files=%d, longest=%ld.%03d s, average=%ld.%03d s",
CheckpointStats.ckpt_bufs_written,
(double) CheckpointStats.ckpt_bufs_written * 100 / NBuffers,
write_secs, write_usecs / 1000,
sync_secs, sync_usecs / 1000,
total_secs, total_usecs / 1000);
total_secs, total_usecs / 1000,
CheckpointStats.ckpt_sync_rels,
longest_secs, longest_usecs / 1000,
average_secs, average_usecs / 1000);
else
elog(LOG, "checkpoint complete: wrote %d buffers (%.1f%%); "
"%d transaction log file(s) added, %d removed, %d recycled; "
"write=%ld.%03d s, sync=%ld.%03d s, total=%ld.%03d s",
"write=%ld.%03d s, sync=%ld.%03d s, total=%ld.%03d s; "
"sync files=%d, longest=%ld.%03d s, average=%ld.%03d s",
CheckpointStats.ckpt_bufs_written,
(double) CheckpointStats.ckpt_bufs_written * 100 / NBuffers,
CheckpointStats.ckpt_segs_added,
@ -6991,7 +7017,10 @@ LogCheckpointEnd(bool restartpoint)
CheckpointStats.ckpt_segs_recycled,
write_secs, write_usecs / 1000,
sync_secs, sync_usecs / 1000,
total_secs, total_usecs / 1000);
total_secs, total_usecs / 1000,
CheckpointStats.ckpt_sync_rels,
longest_secs, longest_usecs / 1000,
average_secs, average_usecs / 1000);
}
/*