On 01/27/2014 07:09 AM, KONDO Mitsumasa wrote:
(2014/01/23 23:18), Andrew Dunstan wrote:
What is more, if the square root calculation is affecting your
benchmarks, I
suspect you are benchmarking the wrong thing.
I run another test that has two pgbench-clients in same time, one is
select-only-query and another is executing 'SELECT *
pg_stat_statement' query in every one second. I used v6 patch in this
test.
The issue of concern is not the performance of pg_stat_statements, AUIU.
The issue is whether this patch affects performance generally, i.e. is
there a significant cost in collecting these extra stats. To test this
you would compare two general pgbench runs, one with the patch applied
and one without. I personally don't give a tinker's cuss about whether
the patch slows down pg_stat_statements a bit.
cheers
andrew
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