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From "PAILLART Frederic" <>
Subject [users@httpd] RE : [users@httpd] mod_mem_cache caches incomplete content
Date Sat, 19 Apr 2008 20:54:40 GMT
Hi Joshua,

Thanks a lot for your answer.
I was not aware that the disk cache is more performant than mem cache.

I'm using worker MPM and I've configured my apache server as follow :
ServerLimit           4
ThreadLimit         502
StartServers          1
MaxClients         2008
MinSpareThreads      25
MaxSpareThreads    1024 
ThreadsPerChild     502
ThreadStackSize  100000

My idea was to maximize the number of threads sharing the same heap to take all benefits of
the memory cache module.
In my context, I have only few objects, but big ones (iso files).
It's why my feeling was to use this memory module and such configuration.

Do you think really that is a bad idea ??

I'm preparing a patch to correct the mem module bug, and writing a new cache module based
on shared memory.
Do you think that such new module will be useful for the community ?



On Thu, Apr 17, 2008 at 6:41 AM, Frederic Paillart
<> wrote:
> Hi all,
>  I'm using mod_mem_cache to cache iso files provided by tomcat backend
>  server (using mod_http_proxy).
>  During the first client download, the iso file is stored into this cache.
>  If this client stops prematurely the download, the cache contains an
>  incomplete part of this iso file.
>  Consequently, for all other requests from all clients, the iso file will
>  be wrong.
>  Of course, we have the same behavior for any kind of content (jpeg,
>  html, ...).

This doesn't directly answer your question, but in general, you should
be aware that the disk cache is much more stable, and very-often more
performant than the memory cache. Unless you have a very good reason
to use the memory cache, you should try the disk cache instead.


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