Messages in this thread | | | Subject | Re: linux scheduler limitations? | Date | Mon, 2 Apr 2001 23:58:45 +0100 (BST) | From | Alan Cox <> |
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> I've found a (to me) unexplicable system behaviour when the number of > Apache forked instances goes somewhere beyond 1050, the machine > suddently slows down almost top a halt and becomes totally unresponsive, > until I stop the test (SpecWeb).
Im suprised it gets that far
> Moreover the max number of processes is not even constant. If I increase > the server load gradually then I manage to have 1500 processes running > with no problem, but if the transition is sharp (the SpecWeb case) than > I end-up having a lock up.
With that many servers and a sudden load you are probably causing a lot of paging. What kernel version. And while this isnt a solution to kernel issues take a look at thttpd instead (www.acme.com). If you have 1500 8K stacks thrashing in your cache you are not going to have good performance.
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