Craig,
could you prepare excerption from your db (if possible), so I could
play myself ?
Oleg
On Mon, 17 Oct 2005, Craig A. James wrote:
Oleg wrote:
Did you consider *decreasing* SIGLENINT ? Size of index will diminish
and performance could be increased. I use in current project SIGLENINT=15
The default value for SIGLENINT actually didn't work at all. It was only by
increasing it that I got any performance at all. An examination of the GIST
indexes showed that most of the first level and many of the second level
bitmaps were saturated.
tsearch2's index is a lossy index, read
http://www.sai.msu.su/~megera/oddmuse/index.cgi/Tsearch_V2_internals
so search results should be rechecked !
Yes, thanks. We do indeed recheck the actual results. The tests I'm running
are just on the raw index performance - how long does it take to "select ...
where dockeys @@ to_tsquery(...)".
We have our TODO http://www.sai.msu.su/~megera/oddmuse/index.cgi/todo
and hope to find sponsorhips for fts project for 8.2 release.
Unfortunately, I didn't find spare time to package tsearchd for you,
it should certainly help you.
At this point we may not have time to try tsearchd, and unfortunately we're
not in a position to sponsor anything yet.
My original question is still bothering me. Is it normal for a keyword that
occurs in more than about 2% of the documents to cause such inconsistent
performance? Is there any single thing I might look at that would help
improve performance (like, do I need more memory? More shared memory?
Different config parameters?)
Thanks,
Craig
Regards,
Oleg
_____________________________________________________________
Oleg Bartunov, sci.researcher, hostmaster of AstroNet,
Sternberg Astronomical Institute, Moscow University (Russia)
Internet: oleg@sai.msu.su, http://www.sai.msu.su/~megera/
phone: +007(095)939-16-83, +007(095)939-23-83
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