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From Dirk-Willem van Gulik <di...@webweaving.org>
Subject Re: strange usage pattern for child processes
Date Wed, 15 Oct 2008 18:44:52 GMT

On 15 Oct 2008, at 14:41, Ruediger Pluem wrote:
> On 10/15/2008 01:55 PM, Lars Eilebrecht wrote:
>>
>> I'm trying to debug a performance issue on an Apache infrastructure
>> using 2.2.9 as reverse proxies. The Apache servers don't do much
>> except for ProxyPass'ing data from others backend servers, and
>> caching the content using mod_mem_cache.
>
> Is it really a good idea to use mod_mem_cache? Keep in mind that
> mod_mem_cache uses local caches per process and cannot use sendfile
> to send cached data. It seems that mod_disk_cache with a cache root
> on a ram disk could be more efficient here.

They may have gotten driven into mod_mem_cache as it was (too) hard or  
would take to long to set up a ram disk with ease on that type of ops  
environment,. And if you assume that:

>> This is Apache with the worker mpm on Solaris. Currently each
>> box is configured with a ServerLimit of 3. The attached screenshot

ServerLimit goes up - you really want to go towards disk/sendfile().
>


Dw.

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