Re: Wierd context-switching issue on Xeon

Dual Athlon

With one process running 30 cs/second
with two process running 15000 cs/second

Dave
On Tue, 2004-04-20 at 08:46, Jeff wrote:
> On Apr 19, 2004, at 8:01 PM, Tom Lane wrote:
> [test case]
>
> Quad P3-700Mhz, ServerWorks, pg 7.4.2 - 1 process: 10-30 cs / second
> 2 process: 100k cs / sec
> 3 process: 140k cs / sec
> 8 process: 115k cs / sec
>
> Dual P2-450Mhz, non-serverworks (piix) - 1 process 15-20 / sec
> 2 process 30k / sec
> 3 (up to 7) process: 15k /sec
>
> (Yes, I verified with more processes the cs's drop)
>
> And finally,
>
> 6 cpu sun e4500, solaris 2.6, pg 7.4.2: 1 - 10 processes: hovered
> between 2-3k cs/second (there was other stuff running on the machine as
> well)
>
>
> Verrry interesting.
> I've got a dual G4 at home, but for convenience Apple doesn't ship a
> vmstat that tells context switches
>
> --
> Jeff Trout <jeff(at)jefftrout(dot)com>
> http://www.jefftrout.com/
> http://www.stuarthamm.net/
>
>
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Dave Cramer
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