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Re: New to PostgreSQL, performance considerations

From: Matthew O'Connor <matthew(at)zeut(dot)net>
To: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
Cc: "Joshua D(dot) Drake" <jd(at)commandprompt(dot)com>, Josh Berkus <josh(at)agliodbs(dot)com>, pgsql-performance(at)postgresql(dot)org, Bruce Momjian <bruce(at)momjian(dot)us>, Alvaro Herrera <alvherre(at)commandprompt(dot)com>, Alexander Staubo <alex(at)purefiction(dot)net>, Michael Stone <mstone+postgres(at)mathom(dot)us>
Subject: Re: New to PostgreSQL, performance considerations
Date: 2006-12-14 16:16:14
Message-ID: 458178CE.7020003@zeut.net (view raw or flat)
Thread:
Lists: pgsql-performance
Tom Lane wrote:
> "Joshua D. Drake" <jd(at)commandprompt(dot)com> writes:
>> On Wed, 2006-12-13 at 18:36 -0800, Josh Berkus wrote:
>>> Mostly, though, pgbench just gives the I/O system a workout.  It's not a 
>>> really good general workload.
> 
>> It also will not utilize all cpus on a many cpu machine. We recently
>> found that the only way to *really* test with pgbench was to actually
>> run 4+ copies of pgbench at the same time.
> 
> The pgbench app itself becomes the bottleneck at high transaction
> rates.  Awhile back I rewrote it to improve its ability to issue
> commands concurrently, but then desisted from submitting the
> changes --- if we change the app like that, future numbers would
> be incomparable to past ones, which sort of defeats the purpose of a
> benchmark no?

What is to stop us from running the new pgbench against older versions 
of PGSQL?  Any stats taken from a run of pgbench a long time ago 
probably aren't relevant against a modern test anyway as the underlying 
hardware and OS are likely to have changed or been updated.



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