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From "pradeep kumar" <pradeep.sm...@gmail.com>
Subject Re: High CPU utilization on using Apache as a reverse proxy
Date Mon, 14 Aug 2006 15:06:52 GMT
More info..

The problem is seen with 2.0.55. It wasn't seen with 2.0.53. Haven't tried
2.0.58 or 2.0.59 yet. The change log for 2.0.58 doesn't seem to indicate any
fix for this problem.


On 8/14/06, pradeep kumar <pradeep.smani@gmail.com> wrote:
>
>  Hi,
>
> I notice there is a 100% CPU utilization which spikes for sometime and
> then goes back to normalcy when Apache is used a reverse proxy. I noticed a
> mail thread which seems to be a similar problem
> http://mail-archives.apache.org/mod_mbox/httpd-dev/200510.mbox/%3C200510252354.30673.jsnow27@gatesec.net%3E.
>
>
> One thread of one of the child processes hangs, calling poll()
> and writev() system calls so frequently that it causes 100% CPU util. The
> thread is trying to writev() to a socked which is in CLOSE_WAIT The child
> process ends after time defined by ndd parameter tcp_keepalive_interval and
> the same service time can be seen in access_log. The problem disappears
> then.
>
> Regards,
>
> Pradeep
>

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