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Disk Cache with multiple virtual hosts

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I've read the Apache 2.4 caching guide, mod_cache and mod_cache_disk pages, but am unsure whether I need a unique CacheRoot for each virtual host, or whether multiple virtual hosts can/should share the same CacheRoot?
Also I'm thinking of setting the CacheRoot to be a tmpfs mount (effectively a ramdisk that will page out to swap space if theres not enough ram to cache everything). If I'm using a unique CacheRoot (a sub-directory in the tmpfs mount), is there anyway to configure Apache to create the CacheRoot directory if it doesn't already exist? If anyone has any thoughts / recommendations / tips in this regards to this approach I would be grateful to here them.

posted Jun 18, 2013 by anonymous

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1 Answer

0 votes

Why not mem cache then? Why would you bother with ramdisk if you want to cache in memory?

If Im using a unique CacheRoot (a sub-directory in the tmpfs mount), is there anyway to configure Apache to create the CacheRoot directory if it doesnt already exist? If anyone has any thoughts / recommendations / tips in this regards to this approach I would be grateful to here them.

answer Jun 18, 2013 by anonymous
Can mem_cache be configured to cache way more than you have memory, and swap out to disk for whatever is least popular?
No but how much cache do you need? On the heavy load prod servers we were using 1GB mem cache. Most of the caching is done on the client side anyway.
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