From: | Pete Forman <pete(dot)forman(at)westerngeco(dot)com> |
---|---|
To: | pgsql-hackers(at)postgresql(dot)org |
Subject: | Re: bad performance on irix |
Date: | 2002-03-25 15:04:04 |
Message-ID: | ofhc3d0b.fsf@westerngeco.com |
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Lists: | pgsql-hackers |
lamigo(at)atc(dot)unican(dot)es ("Luis Alberto Amigo Navarro") writes:
> we're running on sgi powerchallenge, 8 r10000 4-way smp, and we're
> getting bad performance from postgres, throughput increases from 1
> to 5 streams, but from 5 and above there is no further increase,
> performance analysis show high sleep waiting for resources
IIRC there is a bottleneck on calls to sleep() or similar on IRIX
SMP. All requests are dealt with on just one of the CPUs. I don't
recollect whether there is a way to work around that or whether
programs need to be rewritten.
--
Pete Forman -./\.- Disclaimer: This post is originated
WesternGeco -./\.- by myself and does not represent
pete(dot)forman(at)westerngeco(dot)com -./\.- opinion of Schlumberger, Baker
http://petef.port5.com (new) -./\.- Hughes or their divisions.
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