mod file cache - how many files do make sense to cache?

[fauzzo]

Hi,

in these last days I am trying to optimize my apache 2 configuration.
I have about 25.000 unique users and 150.000 page views each day.

I am now trying the module mod_file_cache using the MMapFile directive and I would like to understand how much files does it make sense to have listed to be cached in memory.

Actually I have set about 30 images, but I have about 100 images that I never change and that are often required.

Does anybody know if putting 130 file to be cached is a good idea or not?

Thanks a lot!