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

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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
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src/backend/executor/instrument.c
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@ -145,4 +145,6 @@ BufferUsageAccumDiff(BufferUsage *dst,
dst->local_blks_written += add->local_blks_written - sub->local_blks_written;
dst->temp_blks_read += add->temp_blks_read - sub->temp_blks_read;
dst->temp_blks_written += add->temp_blks_written - sub->temp_blks_written;
INSTR_TIME_ACCUM_DIFF(dst->time_read, add->time_read, sub->time_read);
INSTR_TIME_ACCUM_DIFF(dst->time_write, add->time_write, sub->time_write);
}