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From Rajalakshmi Iyer <>
Subject Re: [users@httpd] Help needed with event MPM configuration
Date Tue, 04 Nov 2014 14:10:53 GMT
Thanks Eric.

We might be able to increase the number of threads available to handle new
connections, but it seems like existing threads are doing nothing (CPU
utilization is quite low). How can that be explained?


On Tue, Nov 4, 2014 at 2:05 PM, Eric Covener <> wrote:

> > Assuming the server is always under heavy load, the 240 worker threads
> are busy working on 240 requests from 240 established connections. As soon
> as they finish their work, they will be working on the subsequent requests
> on the same connection.
> >
> > There are 720 connections that have been accepted by the server, but
> only 240 of those have been worked upon. The remaining 480 will never get a
> chance, because there are subsequent requests on the same connection to be
> worked upon.
> >
> > As it stands today, the symptoms observed are --
> >
> > The server is not responding to new connections
> > The 8 core server machine shows that 80% of each of the 8 cores is idle,
> which means that the workers are not really doing much. Does that mean that
> each of the 240 threads when allocated a connection is waiting for requests
> on that connection and not picking up other connections that are newly
> established?
> If you have 720 units of parallel, non-idle work and you don't want
> queuing, you want MaxRequestWorkers >= 720.
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