Re: 9.3 regression with dbt2

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 &
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