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Re: scalablility problem

From: Christopher Browne <cbbrowne(at)acm(dot)org>
To: pgsql-performance(at)postgresql(dot)org
Subject: Re: scalablility problem
Date: 2007-03-31 01:18:18
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Lists: pgsql-performance
Quoth dingxn(at)cse(dot)ohio-state(dot)edu (Xiaoning Ding):
> When I run multiple TPC-H queries (DBT3) on  postgresql, I found the system
> is not scalable.  My machine has 8GB memory, and 4 Xeon Dual Core processor
> ( 8 cores in total). OS kernel is linux 2.6.9. Postgresql is 7.3.18. I

> I think it might be caused by some contentions. But I do not know postgresql
> much. May anybody give me some clue to find the reasons?

Two primary issues:

1.  You're running a horrendously ancient version of PostgreSQL.  The
7.3 series is Really Old.  Newer versions have *enormous*
improvements that are likely to be *enormously* relevant.

Upgrade to 8.2.

2.  There are known issues with the combination of Xeon processors and
PAE memory addressing; that sort of hardware tends to be *way* less
speedy than the specs would suggest.

There have been "context switching" issues on this sort of hardware
that are enormously worsened if you're running on a version of
PostgreSQL that is 4 major releases out of date.
wm(X,Y):-write(X),write('@'),write(Y). wm('cbbrowne','').
I am not a number!
I am a free man!

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