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Improve logging of autovacuum I/O activity

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This adds some I/O stats to the logging of autovacuum (when the
operation takes long enough that log_autovacuum_min_duration causes it
to be logged), so that it is easier to tune.  Notably, it adds buffer
I/O counts (hits, misses, dirtied) and read and write rate.

Authors: Greg Smith and Noah Misch
This commit is contained in:
Alvaro Herrera
2011-11-25 12:10:46 -03:00
parent 877b67c38b
commit 9d3b502443
5 changed files with 54 additions and 9 deletions
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32
src/backend/commands/vacuumlazy.c
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@ -155,6 +155,10 @@ lazy_vacuum_rel(Relation onerel, VacuumStmt *vacstmt,
BlockNumber possibly_freeable;
PGRUsage ru0;
TimestampTz starttime = 0;
long secs;
int usecs;
double read_rate,
write_rate;
bool scan_all;
TransactionId freezeTableLimit;
BlockNumber new_rel_pages;
@ -166,8 +170,7 @@ lazy_vacuum_rel(Relation onerel, VacuumStmt *vacstmt,
if (IsAutoVacuumWorkerProcess() && Log_autovacuum_min_duration >= 0)
{
pg_rusage_init(&ru0);
if (Log_autovacuum_min_duration > 0)
starttime = GetCurrentTimestamp();
starttime = GetCurrentTimestamp();
}
if (vacstmt->options & VACOPT_VERBOSE)
@ -262,13 +265,29 @@ lazy_vacuum_rel(Relation onerel, VacuumStmt *vacstmt,
/* and log the action if appropriate */
if (IsAutoVacuumWorkerProcess() && Log_autovacuum_min_duration >= 0)
{
TimestampTz endtime = GetCurrentTimestamp();
if (Log_autovacuum_min_duration == 0 ||
TimestampDifferenceExceeds(starttime, GetCurrentTimestamp(),
TimestampDifferenceExceeds(starttime, endtime,
Log_autovacuum_min_duration))
{
TimestampDifference(starttime, endtime, &secs, &usecs);
read_rate = 0;
write_rate = 0;
if ((secs > 0) || (usecs > 0))
{
read_rate = (double) BLCKSZ * VacuumPageMiss / (1024 * 1024) /
(secs + usecs / 1000000.0);
write_rate = (double) BLCKSZ * VacuumPageDirty / (1024 * 1024) /
(secs + usecs / 1000000.0);
}
ereport(LOG,
(errmsg("automatic vacuum of table \"%s.%s.%s\": index scans: %d\n"
"pages: %d removed, %d remain\n"
"tuples: %.0f removed, %.0f remain\n"
"buffer usage: %d hits, %d misses, %d dirtied\n"
"avg read rate: %.3f MiB/s, avg write rate: %.3f MiB/s\n"
"system usage: %s",
get_database_name(MyDatabaseId),
get_namespace_name(RelationGetNamespace(onerel)),
@ -277,8 +296,13 @@ lazy_vacuum_rel(Relation onerel, VacuumStmt *vacstmt,
vacrelstats->pages_removed,
vacrelstats->rel_pages,
vacrelstats->tuples_deleted,
new_rel_tuples,
vacrelstats->new_rel_tuples,
VacuumPageHit,
VacuumPageMiss,
VacuumPageDirty,
read_rate,write_rate,
pg_rusage_show(&ru0))));
}
}
}