From: Josh Berkus <josh@agliodbs.com>
To: pgsql-performance@postgresql.org
Cc: Tom Lane <tgl@sss.pgh.pa.us>
Cc: Alvaro Herrera <alvherre@commandprompt.com>
Subject: Re: User concurrency thresholding: where do I look?
Date: Thu, 19 Jul 2007 18:19:13 -0700
Message-ID: <200707191819.13899.josh@agliodbs.com> (raw)
In-Reply-To: <14009.1184867115@sss.pgh.pa.us>
References: <200707190828.59088.josh@agliodbs.com>
<20070719173704.GA12084@alvh.no-ip.org>
<14009.1184867115@sss.pgh.pa.us>
Tom, all:
> Also, have you tried watching vmstat or local equivalent to confirm that
> the machine's not starting to swap?
We're not swapping.
> Josh, what sort of workload is being tested here --- read-mostly,
> write-mostly, a mixture?
It's a TPCC-like workload, so heavy single-row updates, and the
updates/inserts are what's being measured. For that matter, when I've seen
this before it was with heavy-write workloads and we were measuring the
number of updates/inserts and not the number of reads.
--
Josh Berkus
PostgreSQL @ Sun
San Francisco
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To: pgsql-performance@postgresql.org
Cc: josh@agliodbs.com, tgl@sss.pgh.pa.us, alvherre@commandprompt.com
Subject: Re: User concurrency thresholding: where do I look?
In-Reply-To: <200707191819.13899.josh@agliodbs.com>
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