database/postgres
1
0
Fork 0
mirror of https://github.com/postgres/postgres.git synced 2025-06-30 21:42:05 +03:00
Code Activity

New GUC, track_iotiming, to track I/O timings.

Browse Source 
Currently, the only way to see the numbers this gathers is via
EXPLAIN (ANALYZE, BUFFERS), but the plan is to add visibility through
the stats collector and pg_stat_statements in subsequent patches.

Ants Aasma, reviewed by Greg Smith, with some further changes by me.
This commit is contained in:
Robert Haas
2012-03-27 14:52:37 -04:00
parent 98316e211b
commit 40b9b95769
8 changed files with 72 additions and 0 deletions
Download Patch File Download Diff File Expand all files Collapse all files

18
src/backend/commands/explain.c
View File

@ -1236,6 +1236,8 @@ ExplainNode(PlanState *planstate, List *ancestors,
usage->local_blks_written > 0);
bool has_temp = (usage->temp_blks_read > 0 ||
usage->temp_blks_written > 0);
bool has_timing = (!INSTR_TIME_IS_ZERO(usage->time_read) ||
!INSTR_TIME_IS_ZERO(usage->time_write));
/* Show only positive counter values. */
if (has_shared || has_local || has_temp)
@ -1291,6 +1293,20 @@ ExplainNode(PlanState *planstate, List *ancestors,
}
appendStringInfoChar(es->str, '\n');
}
/* As above, show only positive counter values. */
if (has_timing)
{
appendStringInfoSpaces(es->str, es->indent * 2);
appendStringInfoString(es->str, "I/O Timings:");
if (!INSTR_TIME_IS_ZERO(usage->time_read))
appendStringInfo(es->str, " read=%0.2f",
INSTR_TIME_GET_MILLISEC(usage->time_read));
if (!INSTR_TIME_IS_ZERO(usage->time_write))
appendStringInfo(es->str, " write=%0.2f",
INSTR_TIME_GET_MILLISEC(usage->time_write));
appendStringInfoChar(es->str, '\n');
}
}
else
{
@ -1304,6 +1320,8 @@ ExplainNode(PlanState *planstate, List *ancestors,
ExplainPropertyLong("Local Written Blocks", usage->local_blks_written, es);
ExplainPropertyLong("Temp Read Blocks", usage->temp_blks_read, es);
ExplainPropertyLong("Temp Written Blocks", usage->temp_blks_written, es);
ExplainPropertyFloat("I/O Read Time", INSTR_TIME_GET_MILLISEC(usage->time_read), 3, es);
ExplainPropertyFloat("I/O Write Time", INSTR_TIME_GET_MILLISEC(usage->time_write), 3, es);
}
}