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From Brian Pane <bp...@pacbell.net>
Subject Re: load spikes revisited
Date Fri, 18 Jan 2002 07:07:35 GMT
Aaron Bannert wrote:

>>So is the situation basically this:
>> * Single listener unserialized accept is enabled on daedalus,
>> * We thus have all the idle httpd procs doing a poll before the
>>   accept,
>> * And the spikes in load happen because of the thundering herd
>>   waking up from the poll when a connection arrives?
>>
>>If that's the root cause, then I guess 2.0.29 or later with, say,
>>pthread mutex accept serialization should be able to run without
>>load spikes on daedalus?
>>
>
>I agree, but I have the same reply as above. This may only hide the
>problem.
>

Right, it will only hide the problem.  The real point of trying
the accept mutex on daedalus is as a test case to prove or disprove
the idea that a thundering herd in poll is the problem.

--Brian



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