| From: | Claudio Freire <klaussfreire(at)gmail(dot)com> |
|---|---|
| To: | Dong Ye <yed(at)vmware(dot)com> |
| Cc: | Ants Aasma <ants(at)cybertec(dot)at>, "pgsql-performance(at)postgresql(dot)org" <pgsql-performance(at)postgresql(dot)org> |
| Subject: | Re: dbt2 performance regresses from 9.1.6 to 9.2.1 |
| Date: | 2012-11-05 14:32:37 |
| Message-ID: | CAGTBQpYYuHN8hoxjsWdbaVEqLLz0ns9XSATd80v4u=6SxQ-tBA@mail.gmail.com |
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| Lists: | pgsql-performance |
On Sun, Nov 4, 2012 at 7:23 PM, Dong Ye <yed(at)vmware(dot)com> wrote:
>> You are using prepared statements, this makes me think that this
>> regression might be due to support for parameter specific plans for
>> prepared statements. [1] Can you run the test on both versions without
>> prepared statements and see if the regressions remains.
>
> Without prepare statement, we got 48837.33 avg notpm with 9.1.6 and 43264.54 avg notpm with 9.2.1.
> notps over time shows the slowdown of 9.2.1 is evident during the entire course of the run.
> Their profiles are posted on http://pgsql.privatepaste.com/b770f72967 (9.1.6) and http://pgsql.privatepaste.com/6fa8b7f174 (9.2.1).
You know... it does look as if 9.2.1 is generating a lot more pressure
into the memory allocator (AllocSetAlloc notably higher).
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