How to decide the optimal number of ruby thin/mongrel instances for a server, number of cores?

Posted by Amala on Server Fault See other posts from Server Fault or by Amala
Published on 2011-01-12T00:58:13Z Indexed on 2011/01/12 1:55 UTC
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Filed under:

ruby-on-rails

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mongrel

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mongrel-cluster

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thin

We are trying to deploy mongrel instances on a machine. What is the optimal number of mongrel instances for a server? Since an instance can handle concurrent connections, I do not see any benefit in starting more than 1 per core. Any more than that and the threads will just fight for CPU. Our predecessors have assigned 10 instances for 4 cores, but I think it will just cause CPU contention. Any definitive answers / opinions?

I have seen this question: How many mongrel instances?

But it is really not specific enough.

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