https://issues.apache.org/bugzilla/show_bug.cgi?id=56977

--- Comment #3 from [email protected] ---
(In reply to Ruediger Pluem from comment #2)
> Honest opinion: Don't use mod_mem_cache. It does not speed up things
> compared to mod_disk_cache. mod_mem_cache's cache is not shared between
> different httpd processes. So you waste more memory for getting less
> performance. Given that you have enough memory in your server mod_disk_cache
> content is kept in the buffer caches by the OS. If you don't use SSL stuff
> is send via sendfile which moves stuff from the buffer caches to the socket
> directly inside the kernel. If you are using SSL stuff will need to be MMAP
> which is still very fast.

Yeah, I don't disagree.  Under very high load there is a difference between
mod_mem_cache and mod_disk_cache in so far as the latter requires some extra
syscalls to the OS for file permissions and handles and the like, which can be
particularly expensive in a VM environment, but that is kind of an edge case.

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