Re: Sun Donated a Sun Fire T2000 to the PostgreSQL - Mailing list pgsql-performance

Tatsuo Ishii <ishii@sraoss.co.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 (http://ossipedia.ipa.go.jp). 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?

The test case seems to be spending a remarkable amount of time in LIKE
comparisons, too.  That probably is not a representative condition.

            regards, tom lane