What's the cost of using hundreds of threads?
Nick Coghlan
ncoghlan at iinet.net.au
Wed Mar 2 06:59:17 EST 2005
Steve Holden wrote:
> Apache, for example, can easily spawn more threads under Windows, and
> I've written code that uses 200 threads with excellent performance.
> Things seem to slow down around the 2,000 mark for some reason I'm not
> familiar with.
As far as I know, the default Windows thread stack size is 2 MB. Do the math :)
On NT4, beyond a couple of hundred threads a *heck* of a lot of time ends up
being spent in the kernel doing context switches (and you can kiss even vaguely
deterministic response times good-bye).
Using a more recent version of Windows improves matters significantly.
Cheers,
Nick.
--
Nick Coghlan | ncoghlan at email.com | Brisbane, Australia
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