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Date: Thu, 1 Jul 2010 20:40:50 -0400
Message-ID: <AANLkTikbTKkyeqZ90MP3KnN3GkuvQ6nIlkEpCkcE4uWA@mail.gmail.com>
From: Eric Covener <covener@gmail.com>
To: users@httpd.apache.org
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Subject: Re: [users@httpd] Win32 Apache HTTP performance/reliability problem

> n Thu, Jul 1, 2010 at 7:35 PM, Joe Novak <jnovak@mainstreamdata.com> wrot=
e:
> I set up a jmeter test to open a socket to Apache HTTP, request a very
> small file, and close the socket. =A0Jmeter is running on the same box as
> the Apache HTTP service. =A0At 2 sockets/second, there is a 3% error rate=
.
> At 5 sockets/second, the error rate increases to 8%. =A0Failures occur at
> regular intervals. =A0With 2 sockets/second failure is about every 20
> minutes. =A0With 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. =A0Failure occurred within just a few seconds.
> The symptoms were much worse with this test. =A0Symptoms were very much
> like a denial of service. =A0When 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. =A0Relevant tweaks from
> httpd.conf are shown below.
>
> ThreadLimit =A0 =A0 =A0 =A0 =A03600
> ThreadsPerChild =A0 =A0 =A03200
>
> I also tried the following to improve reliability, but it made no
> difference.
>
> EnableMMAP off
> EnableSendfile off
> Win32DisableAcceptEx
>
> Has anyone else observed these problems? =A0Is there anything that can be
> done to improve reliability or performance? =A0Thanks.

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

--=20
Eric Covener
covener@gmail.com

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