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From "Julian Dunn" <Julian.D...@CBC.CA>
Subject [users@httpd] What should MaxClients be?
Date Mon, 08 Dec 2008 04:56:27 GMT
I am one of the server administrators of a busy news site and I've been trying to find a definitive
answer/guide for choosing MaxClients.

We run a farm of six Linux webservers each with 8GB of RAM and several distinct Apache instances
on every server. The main instance, which gets most of the traffic, has a MaxClients setting
of 768, and is using the worker MPM. Considering that

$ ps -fwwylC httpd.worker --sort:rss 

on each shows the average memory consumed by each process to be ~30MB, is our MaxClients setting
too low? Far too low? We do occasionally run into situations during peak times when MaxClients
is hit, but I'm reluctant to increase it for fear the webservers will start swapping.

- Julian

-- Julian C. Dunn, P.Eng. <>
-- Assistant Team Lead / Chef d'équipe adjoint
-- Media Production Support / Soutien à la production des médias
-- Canadian Broadcasting Corporation / Société Radio-Canada
-- Office/Bureau: 2C310-N  *  Tel.: (416) 205-3311 x6988 * DID: 1-151-6988 

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