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Wierd context-switching issue on Xeon

From: Josh Berkus <josh(at)agliodbs(dot)com>
To: pgsql-performance(at)postgresql(dot)org
Subject: Wierd context-switching issue on Xeon
Date: 2003-11-25 22:19:36
Message-ID: (view raw, whole thread or download thread mbox)
Lists: pgsql-performance

We're seeing some odd issues with hyperthreading-capable Xeons, whether or not 
hyperthreading is enabled.   Basically, when a small number of really-heavy 
duty queries hit the system and push all of the CPUs to more than 70% used 
(about 1/2 user & 1/2 kernel), the system goes to 100,000+ context switcthes 
per second and performance degrades.  

I know that there's other Xeon users on this list ... has anyone else seen 
anything like that?   The machines are Dells running Red Hat 7.3.

-Josh Berkus
 Aglio Database Solutions
 San Francisco


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