Yes, it's turned on, unfortunately it got overlooked during the setup, and until now...! 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. Thanks, Anjan -----Original Message----- From: Scott Marlowe [mailto:smarlowe@xxxxxxxxxxxxxxxxx] Sent: Tuesday, November 22, 2005 3:38 PM To: Anjan Dave Cc: Tom Lane; Vivek Khera; Postgresql Performance Subject: Re: [PERFORM] High context switches occurring On Tue, 2005-11-22 at 14:33, Anjan Dave wrote: > Is there any way to get a temporary relief from this Context Switching > storm? Does restarting postmaster help? > > It seems that I can recreate the heavy CS with just one SELECT > statement...and then when multiple such SELECT queries are coming in, > things just get hosed up until we cancel a bunch of queries... Is your machine a hyperthreaded one? Some folks have found that turning off hyper threading helps. I knew it made my servers better behaved in the past.
