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Publish checkpoint timing information to pg_stat_bgwriter.

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Greg Smith, Peter Geoghegan, and Robert Haas
This commit is contained in:
Robert Haas
2012-04-05 14:03:21 -04:00
parent a75b08066a
commit b736aef2ec
10 changed files with 81 additions and 26 deletions
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30
src/backend/access/transam/xlog.c
View File

@@ -7511,9 +7511,6 @@ LogCheckpointEnd(bool restartpoint)
CheckpointStats.ckpt_end_t = GetCurrentTimestamp();
TimestampDifference(CheckpointStats.ckpt_start_t,
CheckpointStats.ckpt_end_t,
&total_secs, &total_usecs);
TimestampDifference(CheckpointStats.ckpt_write_t,
CheckpointStats.ckpt_sync_t,
@@ -7523,6 +7520,23 @@ LogCheckpointEnd(bool restartpoint)
CheckpointStats.ckpt_sync_end_t,
&sync_secs, &sync_usecs);
/* Record checkpoint timing summary data. */
BgWriterStats.m_checkpoint_write_time +=
write_secs * 1000 + write_usecs / 1000;
BgWriterStats.m_checkpoint_sync_time +=
sync_secs * 1000 + sync_usecs / 1000;
/*
* All of the published timing statistics are accounted for. Only
* continue if a log message is to be written.
*/
if (!log_checkpoints)
return;
TimestampDifference(CheckpointStats.ckpt_start_t,
CheckpointStats.ckpt_end_t,
&total_secs, &total_usecs);
/*
* Timing values returned from CheckpointStats are in microseconds.
* Convert to the second plus microsecond form that TimestampDifference
@@ -7971,9 +7985,8 @@ CreateCheckPoint(int flags)
if (!RecoveryInProgress())
TruncateSUBTRANS(GetOldestXmin(true, false));
/* All real work is done, but log before releasing lock. */
if (log_checkpoints)
LogCheckpointEnd(false);
/* Real work is done, but log and update stats before releasing lock. */
LogCheckpointEnd(false);
TRACE_POSTGRESQL_CHECKPOINT_DONE(CheckpointStats.ckpt_bufs_written,
NBuffers,
@@ -8237,9 +8250,8 @@ CreateRestartPoint(int flags)
if (EnableHotStandby)
TruncateSUBTRANS(GetOldestXmin(true, false));
/* All real work is done, but log before releasing lock. */
if (log_checkpoints)
LogCheckpointEnd(true);
/* Real work is done, but log and update before releasing lock. */
LogCheckpointEnd(true);
xtime = GetLatestXTime();
ereport((log_checkpoints ? LOG : DEBUG2),

2
src/backend/catalog/system_views.sql
View File

@@ -648,6 +648,8 @@ CREATE VIEW pg_stat_bgwriter AS
SELECT
pg_stat_get_bgwriter_timed_checkpoints() AS checkpoints_timed,
pg_stat_get_bgwriter_requested_checkpoints() AS checkpoints_req,
pg_stat_get_checkpoint_write_time() AS checkpoint_write_time,
pg_stat_get_checkpoint_sync_time() AS checkopint_sync_time,
pg_stat_get_bgwriter_buf_written_checkpoints() AS buffers_checkpoint,
pg_stat_get_bgwriter_buf_written_clean() AS buffers_clean,
pg_stat_get_bgwriter_maxwritten_clean() AS maxwritten_clean,

2
src/backend/postmaster/pgstat.c
View File

@@ -4455,6 +4455,8 @@ pgstat_recv_bgwriter(PgStat_MsgBgWriter *msg, int len)
{
globalStats.timed_checkpoints += msg->m_timed_checkpoints;
globalStats.requested_checkpoints += msg->m_requested_checkpoints;
globalStats.checkpoint_write_time += msg->m_checkpoint_write_time;
globalStats.checkpoint_sync_time += msg->m_checkpoint_sync_time;
globalStats.buf_written_checkpoints += msg->m_buf_written_checkpoints;
globalStats.buf_written_clean += msg->m_buf_written_clean;
globalStats.maxwritten_clean += msg->m_maxwritten_clean;

25
src/backend/storage/smgr/md.c
View File

@@ -1094,27 +1094,22 @@ mdsync(void)
entry->tag.segno * ((BlockNumber) RELSEG_SIZE),
false, EXTENSION_RETURN_NULL);
if (log_checkpoints)
INSTR_TIME_SET_CURRENT(sync_start);
else
INSTR_TIME_SET_ZERO(sync_start);
INSTR_TIME_SET_CURRENT(sync_start);
if (seg != NULL &&
FileSync(seg->mdfd_vfd) >= 0)
{
if (log_checkpoints && (!INSTR_TIME_IS_ZERO(sync_start)))
{
INSTR_TIME_SET_CURRENT(sync_end);
sync_diff = sync_end;
INSTR_TIME_SUBTRACT(sync_diff, sync_start);
elapsed = INSTR_TIME_GET_MICROSEC(sync_diff);
if (elapsed > longest)
longest = elapsed;
total_elapsed += elapsed;
processed++;
INSTR_TIME_SET_CURRENT(sync_end);
sync_diff = sync_end;
INSTR_TIME_SUBTRACT(sync_diff, sync_start);
elapsed = INSTR_TIME_GET_MICROSEC(sync_diff);
if (elapsed > longest)
longest = elapsed;
total_elapsed += elapsed;
processed++;
if (log_checkpoints)
elog(DEBUG1, "checkpoint sync: number=%d file=%s time=%.3f msec",
processed, FilePathName(seg->mdfd_vfd), (double) elapsed / 1000);
}
break; /* success; break out of retry loop */
}

14
src/backend/utils/adt/pgstatfuncs.c
View File

@@ -87,6 +87,8 @@ extern Datum pg_stat_get_db_block_time_write(PG_FUNCTION_ARGS);
extern Datum pg_stat_get_bgwriter_timed_checkpoints(PG_FUNCTION_ARGS);
extern Datum pg_stat_get_bgwriter_requested_checkpoints(PG_FUNCTION_ARGS);
extern Datum pg_stat_get_checkpoint_write_time(PG_FUNCTION_ARGS);
extern Datum pg_stat_get_checkpoint_sync_time(PG_FUNCTION_ARGS);
extern Datum pg_stat_get_bgwriter_buf_written_checkpoints(PG_FUNCTION_ARGS);
extern Datum pg_stat_get_bgwriter_buf_written_clean(PG_FUNCTION_ARGS);
extern Datum pg_stat_get_bgwriter_maxwritten_clean(PG_FUNCTION_ARGS);
@@ -1419,6 +1421,18 @@ pg_stat_get_bgwriter_maxwritten_clean(PG_FUNCTION_ARGS)
PG_RETURN_INT64(pgstat_fetch_global()->maxwritten_clean);
}
Datum
pg_stat_get_checkpoint_write_time(PG_FUNCTION_ARGS)
{
PG_RETURN_INT64(pgstat_fetch_global()->checkpoint_write_time);
}
Datum
pg_stat_get_checkpoint_sync_time(PG_FUNCTION_ARGS)
{
PG_RETURN_INT64(pgstat_fetch_global()->checkpoint_sync_time);
}
Datum
pg_stat_get_bgwriter_stat_reset_time(PG_FUNCTION_ARGS)
{