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From "Xuekun Hu" <xuekun...@gmail.com>
Subject [users@httpd] caching limit files in mod_file_cache?
Date Mon, 13 Mar 2006 08:58:28 GMT
Changed the title to be noticed. :-)

---------- Forwarded message ----------
From: Xuekun Hu <xuekun.hu@gmail.com>
Date: Mar 10, 2006 7:38 PM
Subject: Re: [users@httpd] mod_mem_cache configuration help
To: users@httpd.apache.org


Thanks for replying.

I tested mod_file_cache. However I also met some errors both with
cachefile and mmapfile. When I want to cache more than 20 files, there
are the below errors.

Using cachefile:
[Fri Mar 10 12:56:47 2006] [info] [client 10.0.1.4] (70014)End of file
found: core_output_filter: writing data to the network
[Fri Mar 10 12:56:47 2006] [info] [client 10.0.1.4] (70014)End of file
found: core_output_filter: writing data to the network
[Fri Mar 10 12:56:48 2006] [info] [client 10.0.1.3] (70014)End of file
found: core_output_filter: writing data to the network
...

Using mmapfile:
[Fri Mar 10 15:32:03 2006] [info] [client 10.0.0.7] (14)Bad address:
core_output_filter: writing data to the network
[Fri Mar 10 15:32:03 2006] [info] [client 10.0.0.7] (14)Bad address:
core_output_filter: writing data to the network
[Fri Mar 10 15:32:03 2006] [info] [client 10.0.1.3] (14)Bad address:
core_output_filter: writing data to the network
...

While when caching below 10 files, all work fine. It seems
mod_file_cache can't cache many files?

My configuration is:
 4 x Intel Xeon (EM64T)
 SLES9 SP2 (64bit)

Is it a bug?

Thx, Xuekun

On 2/24/06, Joshua Slive <joshua@slive.ca> wrote:
> On 2/23/06, Xuekun Hu <xuekun.hu@gmail.com> wrote:
> > Hi,
> >
> > I want to cache some files and don't want them to be removed if the
> > cache if full. That's means the cache is serviced as
> > first-come-first-service basis. Can I do that by setting
> > "CacheDefaultExpire" to a large number?
> >
> > However I found this sentence "If a new object needs to be inserted in
> > the cache and the size of the object is greater than the remaining
> > memory, objects will be removed until the new object can be cached.
> > The object to be removed is selected using the algorithm specified by
> > MCacheRemovalAlgorithm" in docs. So it seems the objects are hard to
> > stay in the cache, it has the the chance to be removed out!
> >
> > Any ideas? Thanks in advance.
>
> It sounds like you may be looking for mod_file_cache.
>

> If not, you may also want to consider using mod_disk_cache in place of
> mod_mem_cache, because it allows the OS to be in charge of the memory
> caching issues (using the OS buffer cache) and hence will often
> outperform mod_mem_cache.
>
> Joshua.
>
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