Re: GiST index performance

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On Thu, Feb 25, 2010 at 6:42 PM, Bruce Momjian <bruce@xxxxxxxxxx> wrote:
> Was there every any conclusion on this issue?

I don't think so.

...Robert

> ---------------------------------------------------------------------------
>
> Matthew Wakeling wrote:
>>
>> Revisiting the thread a month back or so, I'm still investigating
>> performance problems with GiST indexes in Postgres.
>>
>> Looking at http://wiki.postgresql.org/wiki/PostgreSQL_8.4_Open_Items I'd
>> like to clarify the contrib/seg issue. Contrib/seg is vulnerable to
>> pathological behaviour which is fixed by my second patch, which can be
>> viewed as complete. Contrib/cube, being multi-dimensional, is not affected
>> to any significant degree, so should not need alteration.
>>
>> A second quite distinct issue is the general performance of GiST indexes
>> which is also mentioned in the old thread linked from Open Items. For
>> that, we have a test case at
>> http://archives.postgresql.org/pgsql-performance/2009-04/msg00276.php for
>> btree_gist indexes. I have a similar example with the bioseg GiST index. I
>> have completely reimplemented the same algorithms in Java for algorithm
>> investigation and instrumentation purposes, and it runs about a hundred
>> times faster than in Postgres. I think this is a problem, and I'm willing
>> to do some investigation to try and solve it.
>>
>> Do you have a recommendation for how to go about profiling Postgres, what
>> profiler to use, etc? I'm running on Debian Linux x86_64.
>>
>> Matthew
>>
>> --
>>  Jadzia: Don't forget the 34th rule of acquisition: Peace is good for business.
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>>  Jadzia: Oh yes, that's right. What's the 34th again?
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>>
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> --
>  Bruce Momjian  <bruce@xxxxxxxxxx>        http://momjian.us
>  EnterpriseDB                             http://enterprisedb.com
>  PG East:  http://www.enterprisedb.com/community/nav-pg-east-2010.do
>  + If your life is a hard drive, Christ can be your backup. +
>
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