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Re: Sun Donated a Sun Fire T2000 to the PostgreSQL

From: Tatsuo Ishii <ishii(at)sraoss(dot)co(dot)jp>
To: tgl(at)sss(dot)pgh(dot)pa(dot)us
Cc: Robert(dot)Lor(at)Sun(dot)COM, pgsql-hackers(at)postgresql(dot)org,pgsql-performance(at)postgresql(dot)org
Subject: Re: Sun Donated a Sun Fire T2000 to the PostgreSQL
Date: 2006-07-13 09:02:34
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Lists: pgsql-hackerspgsql-performance
> > Tatsuo Ishii <ishii(at)sraoss(dot)co(dot)jp> writes:
> > > Interesting. We (some Japanese companies including SRA OSS,
> > > Inc. Japan) did some PG scalability testing using a Unisys's big 16
> > > (physical) CPU machine and found PG scales up to 8 CPUs. However
> > > beyond 8 CPU PG does not scale anymore. The result can be viewed at
> > > "OSS iPedia" web site ( Our conclusion was
> > > PG has a serious lock contention problem in the environment by
> > > analyzing the oprofile result.
> > 
> > 18% in s_lock is definitely bad :-(.  Were you able to determine which
> > LWLock(s) are accounting for the contention?
> Yes. We were interested in that too. Some people did addtional tests
> to determin that. I don't have the report handy now. I will report
> back next week.

Sorry for the delay. Finally I got the oprofile data. It's
huge(34MB). If you are interested, I can put somewhere. Please let me
Tatsuo Ishii
SRA OSS, Inc. Japan

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