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From Eric Covener <cove...@gmail.com>
Subject Re: [users@httpd] Win32 Apache HTTP performance/reliability problem
Date Fri, 02 Jul 2010 00:40:50 GMT
> n Thu, Jul 1, 2010 at 7:35 PM, Joe Novak <jnovak@mainstreamdata.com> wrote:
> I set up a jmeter test to open a socket to Apache HTTP, request a very
> small file, and close the socket.  Jmeter is running on the same box as
> the Apache HTTP service.  At 2 sockets/second, there is a 3% error rate.
> At 5 sockets/second, the error rate increases to 8%.  Failures occur at
> regular intervals.  With 2 sockets/second failure is about every 20
> minutes.  With 5 sockets/second, failure is at 15 minute intervals.
>
> In a separate jmeter test, I set up 1300 concurrent requests with a
> delay between each run.  Failure occurred within just a few seconds.
> The symptoms were much worse with this test.  Symptoms were very much
> like a denial of service.  When I open a browser and manually download
> the small file, the browser spins and never returns with a response.
>
> I have tried tweaking the Windows registry and the httpd.conf file to
> improve performance, but nothing seems to help.  Relevant tweaks from
> httpd.conf are shown below.
>
> ThreadLimit          3600
> ThreadsPerChild      3200
>
> I also tried the following to improve reliability, but it made no
> difference.
>
> EnableMMAP off
> EnableSendfile off
> Win32DisableAcceptEx
>
> Has anyone else observed these problems?  Is there anything that can be
> done to improve reliability or performance?  Thanks.

what version of windows, and are you sure you didn't run out of usable
client ports?

-- 
Eric Covener
covener@gmail.com

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