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Number of threads used by memcached

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Mon, 04/25/2011 - 11:55
orieg
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Joined: 03/14/2011
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Hi, we are using Membase from the Git repo. We deploy it on EC2 and use EBS volume for the persistent storage. The instances we use are only two core. I was wondering if it would be good for us to start the memcached process with two threads instead of the defualt 4 (using -t). I couldn't figure out the corretc way to set that in the config file, it seems there is a ports_server option or something like that, but I would like to just add the "-t 2" without redefining all the server config. So far I created a memcached wrapper script called "memcached" and moved the original one being call by the wrapper with the correct options but it's really hacky.

Any idea how to do that clean ? Do you think this change could help on EC2 env that has bad cpu perf ?

Thanks,
Nicolas

PS : I wanted to post on the 1.7.x forum but the form doesn't allow me to do so.

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Mon, 04/25/2011 - 12:41
perry
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Joined: 10/11/2010
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Nicholas,
In general, you shouldn't need to change the thread count. Even with 2 cores, the software should perform well with 4 threads (those two don't need to line up).

We are in the process of implementing a better configuration system, for the moment your "hack" should be sufficient.

The higher-level 1.7 forums are not open yet since we have not released that version as GA but the "developer preview" forum is available for your feedback. I've put a note in there to help prevent this confusion in the future.

Thanks!

Perry

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