Re: GiST index performance

[Bruce Momjian <bruce(at)momjian(dot)us>]

Was there every any conclusion on this issue?

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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
> 
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  Bruce Momjian  <bruce(at)momjian(dot)us>        http://momjian.us
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