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From "Rose, John B" <>
Subject Re: [users@httpd] RE: Thread ratios
Date Fri, 18 Nov 2016 16:19:35 GMT
I think that is Apache 2.4.6

If using PHP-FPM I think you may need to coordinate some settings in PHP-FPM (pm.max_children,
etc.) with your config settings (MaxRequestWorkers, etc) in Apache.

If you do rewrites you may want to be aware of this …

From: Darryl Philip Baker <>
Reply-To: "" <>
Date: Friday, November 18, 2016 at 10:28 AM
To: "" <>
Subject: [users@httpd] RE: Thread ratios

I forgot to mention, just in case this has any effect on the numbers, the OS is RHEL7 using
the distributed version of Apache HTTPD.

Darryl Baker

From: Darryl Philip Baker
Sent: November 18, 2016 9:12 AM
Subject: [users@httpd] Thread ratios

I am converting an older system Apache 2.2 using mpm_prefork to Apache 2.4. I think we would
have better performance with mpm_worker or possibly  mpm_event. My problem is trying to figure
out what is the best ratio of threads per process, the correct way to set that value, and
the best value for the total number of threads which I think is set by MaxRequestWorkers.
I am tuning my cluster of systems for a sudden heavy load of page requests but not a lot of
CGI or other complex operations. These are dual processor VM systems. Any suggestions or pointers?

Darryl Baker
Sr. System Administrator
Distributed Application Platform Services
Project Management Office and Enabling Technologies
Northwestern | Information Technology
1800 Sherman Ave., Suite 600
Evanston, IL  60201-3715
(847) 467-6674<>

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