From: Simon Riggs <simon@2ndquadrant.com>
To: Anjan Dave <adave@vantage.com>
Cc: Scott Marlowe <smarlowe@g2switchworks.com>
Cc: Tom Lane <tgl@sss.pgh.pa.us>
Cc: Vivek Khera <vivek@khera.org>
Cc: Postgresql Performance <pgsql-performance@postgresql.org>
Subject: Re: High context switches occurring
Date: Wed, 23 Nov 2005 18:13:58 +0000
Message-ID: <1132769638.4347.7.camel@localhost.localdomain> (raw)
In-Reply-To: <4BAFBB6B9CC46F41B2AD7D9F4BBAF785098E78@vt-pe2550-001.vantage.vantage.com>
References: <4BAFBB6B9CC46F41B2AD7D9F4BBAF785098E78@vt-pe2550-001.vantage.vantage.com>
On Tue, 2005-11-22 at 18:17 -0500, Anjan Dave wrote:
> It's mostly a 'read' application, I increased the vm.max-readahead to
> 2048 from the default 256, after which I've not seen the CS storm,
> though it could be incidental.
Can you verify this, please?
Turn it back down again, try the test, then reset and try the test.
If that is a repeatable way of recreating one manifestation of the
problem then we will be further ahead than we are now.
Thanks,
Best Regards, Simon Riggs
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To: pgsql-performance@postgresql.org
Cc: simon@2ndquadrant.com, adave@vantage.com, smarlowe@g2switchworks.com, tgl@sss.pgh.pa.us, vivek@khera.org
Subject: Re: High context switches occurring
In-Reply-To: <1132769638.4347.7.camel@localhost.localdomain>
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