| From: | Andres Freund <andres(at)2ndquadrant(dot)com> |
|---|---|
| To: | Dong Ye <yed(at)vmware(dot)com> |
| Cc: | pgsql-hackers(at)postgresql(dot)org |
| Subject: | Re: 9.3 regression with dbt2 |
| Date: | 2013-12-18 19:17:44 |
| Message-ID: | 20131218191744.GB26481@alap2.anarazel.de |
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| Lists: | pgsql-hackers |
Hello,
On 2013-12-18 10:24:56 -0800, Dong Ye wrote:
> It seems that 0ac5ad5134f2769ccbaefec73844f8504c4d6182 is the culprit
> commit.
How long does a run take to verify the problem? Could you retry with the
patch attached to
http://www.postgresql.org/message-id/20131201114514.GG18793@alap2.anarazel.de
? Based on the theory that it creates many superflous multixacts.
> Flat perf profiles of two such runs look like:
Those aren't really flat profiles tho ;)
> 0ac:
>
> Samples: 706K of event 'cycles', Event count (approx.): 6690377376522
>
>
> + 3.82% postgres postgres [.]
> GetMultiXactIdMembers
Could you expland that one some levels, so we see the callers?
Greetings,
Andres Freund
--
Andres Freund http://www.2ndQuadrant.com/
PostgreSQL Development, 24x7 Support, Training & Services
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