On Oct 22, 2007, at 7:31 PM, Joshua Slive wrote:
On 10/22/07, Eric Covener <covener@xxxxxxxxx> wrote:On 10/22/07, Jim Albert <jim@xxxxxxxxxxxxx> wrote:For the purposes of testing a heavy load situation, I'd like toconfigure one of my apache web servers to intentionally respond slow toa request.mod_ext_filter might help you simulate some of this by adding some silly perl/php/python as an output filter that stalls/burns cpu/etc.Or just "cat" combined with "sleep".
That would work for slow output, but not necessarily if you want to simulate high CPU load. Turns out the OS (at least Linux, haven't tried any others) is smart about sleep() and doesn't actually make it use CPU cycles. So sleep()ing a bunch of processes/threads will not get you a high CPU load.
To keep the CPUs busy you'd have to make it do something resource- intensive, like compute digits of Pi, or find partial hash collisions.
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