Was there every any conclusion on this issue? --------------------------------------------------------------------------- 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. > Quark: That's the 35th. > Jadzia: Oh yes, that's right. What's the 34th again? > Quark: War is good for business. It's easy to get them mixed up. > > -- > Sent via pgsql-performance mailing list (pgsql-performance@xxxxxxxxxxxxxx) > To make changes to your subscription: > http://www.postgresql.org/mailpref/pgsql-performance -- 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. + -- Sent via pgsql-performance mailing list (pgsql-performance@xxxxxxxxxxxxxx) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-performance
