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Expose track_iotiming data via the statistics collector.

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Ants Aasma's original patch to add timing information for buffer I/O
requests exposed this data at the relation level, which was judged too
costly.  I've here exposed it at the database level instead.
This commit is contained in:
Robert Haas
2012-04-05 11:37:31 -04:00
parent 05dbd4a773
commit 644828908f
10 changed files with 99 additions and 9 deletions
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16
src/backend/postmaster/pgstat.c
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@@ -197,6 +197,8 @@ static PgStat_SubXactStatus *pgStatXactStack = NULL;
static int pgStatXactCommit = 0;
static int pgStatXactRollback = 0;
PgStat_Counter pgStatBlockTimeRead = 0;
PgStat_Counter pgStatBlockTimeWrite = 0;
/* Record that's written to 2PC state file when pgstat state is persisted */
typedef struct TwoPhasePgStatRecord
@@ -782,13 +784,15 @@ pgstat_send_tabstat(PgStat_MsgTabstat *tsmsg)
return;
/*
* Report accumulated xact commit/rollback whenever we send a normal
* tabstat message
* Report accumulated xact commit/rollback and I/O timings whenever we send
* a normal tabstat message
*/
if (OidIsValid(tsmsg->m_databaseid))
{
tsmsg->m_xact_commit = pgStatXactCommit;
tsmsg->m_xact_rollback = pgStatXactRollback;
tsmsg->m_block_time_read = pgStatBlockTimeRead;
tsmsg->m_block_time_write = pgStatBlockTimeWrite;
pgStatXactCommit = 0;
pgStatXactRollback = 0;
}
@@ -796,6 +800,8 @@ pgstat_send_tabstat(PgStat_MsgTabstat *tsmsg)
{
tsmsg->m_xact_commit = 0;
tsmsg->m_xact_rollback = 0;
tsmsg->m_block_time_read = 0;
tsmsg->m_block_time_write = 0;
}
n = tsmsg->m_nentries;
@@ -3352,6 +3358,8 @@ pgstat_get_db_entry(Oid databaseid, bool create)
result->n_temp_files = 0;
result->n_temp_bytes = 0;
result->n_deadlocks = 0;
result->n_block_time_read = 0;
result->n_block_time_write = 0;
result->stat_reset_timestamp = GetCurrentTimestamp();
@@ -4070,6 +4078,8 @@ pgstat_recv_tabstat(PgStat_MsgTabstat *msg, int len)
*/
dbentry->n_xact_commit += (PgStat_Counter) (msg->m_xact_commit);
dbentry->n_xact_rollback += (PgStat_Counter) (msg->m_xact_rollback);
dbentry->n_block_time_read += msg->m_block_time_read;
dbentry->n_block_time_write += msg->m_block_time_write;
/*
* Process all table entries in the message.
@@ -4266,6 +4276,8 @@ pgstat_recv_resetcounter(PgStat_MsgResetcounter *msg, int len)
dbentry->n_temp_bytes = 0;
dbentry->n_temp_files = 0;
dbentry->n_deadlocks = 0;
dbentry->n_block_time_read = 0;
dbentry->n_block_time_write = 0;
dbentry->stat_reset_timestamp = GetCurrentTimestamp();