Different memcached cache sizes across servers

Dean Harding dean.harding at dload.com.au
Thu Apr 3 22:56:31 UTC 2008

dormando wrote:
> I'd actually recommend against running multiple instances if possible. 
> Having larger instances makes multiget's more efficient, and causes 
> fewer roundtrips.
> If it doesn't work to simply list a server multiple times, those clients 
> should be fixed.

At one point, I patched the Enyim memcached client to support a "weight" 
parameter in the server config, so you specified an integer that 
represented the "weight" of a server, and the hashing algorithm took 
that into account when generating hashes for the server (so a server 
with a weight of 10 would get ten times as many hashes as a server with 
a weight of 1).

It worked really well, because you basically just set the weight to the 
number of MB/GB of memory assigned to memcached on that server.

Unfortunately, I don't have the patch anymore, since we're now running 
identical servers and I didn't need it, but it was pretty simple :-)


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