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From Ruediger Pluem <rpl...@apache.org>
Subject Re: Avoiding mem_cache assumptions
Date Wed, 22 Aug 2007 18:50:35 GMT


On 08/22/2007 08:33 PM, Vincent Bray wrote:
> Hoi,
> 
> It's a common misconception that because mem_cache uses 'memory'
> rather disk_cache using 'disk', that one should assume the former is
> somehow faster.
> 
> Documenting this misconception is fraught with not wanting to say
> "this sucks", so let's not say that. How about:
> 
> Index: docs/manual/mod/mod_mem_cache.xml
> ===================================================================
> --- docs/manual/mod/mod_mem_cache.xml   (revision 567358)
> +++ docs/manual/mod/mod_mem_cache.xml   (working copy)
> @@ -41,6 +41,11 @@
> 
>      <p>Content is stored in and retrieved from the cache using URI based
>      keys. Content with access protection is not cached.</p>
> +
> +    <note><title>Note</title>Don't assume that because this module
caches in
> +    memory it is faster than <module>mod_disk_cache</module>. Modern virtual
> +    memory systems can make delivery from disk more efficient using
> kernel level
> +    <code>sendfile()</code> support.</note>
>  </summary>
>  <seealso><module>mod_cache</module></seealso>
>  <seealso><module>mod_disk_cache</module></seealso>
> 
> (I should note that this 'patch' is an addition to the <summary> atop
> mod_mem_cache.xml)
> 
> There are of course other issue related to per-worker caches in
> mem_cache, but I don't know sendfile() from sendelbow(), so this is
> the best I could come up with.
> 
> I'm not terribly diplomatic at the best of times, so is there a better
> way to suggest that users try disk_cache first?

Maybe a pointer to http://httpd.apache.org/docs/2.2/en/caching.html#inmemory
could help. It has some more detailed explanations.

Regards

RĂ¼diger


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