Re: [PERFORM] Hash Anti Join performance degradation

2011/6/1 Robert Haas <robertmhaas(at)gmail(dot)com>:
> On Tue, May 31, 2011 at 8:43 PM, Cédric Villemain
> <cedric(dot)villemain(dot)debian(at)gmail(dot)com> wrote:
>> Yes, while here I noticed that the query was long to be killed.
>> I added a CHECK_FOR_INTERRUPT() in the for(;;) loop in nodeHashjoin.c.
>> It fixes the delay when trying to kill but I don't know about
>> performance impact this can have in this place of the code.
>
> Well, seems easy enough to find out: just test the query with and
> without your patch (and without casserts).  If there's no measurable
> difference on this query, there probably won't be one anywhere

Oh damned, I am currently with an eeepc, I'll need 2 days to bench that :-D
I'll see tomorow.
.
>
> --
> Robert Haas
> EnterpriseDB: http://www.enterprisedb.com
> The Enterprise PostgreSQL Company
>

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Cédric Villemain               2ndQuadrant
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