Largest production memcached install?

Jerry Maldonado jerry.maldonado at
Thu May 3 18:41:06 UTC 2007

With the configuration you noted below, what is your CPU utilization.  We are implementing memcached in our environment and I am trying to get a feel for what we will need for production.  I realize that it all depends on how we are using it, but I am interested to see what it is based on your configuration.

-----Original Message-----
From: memcached-bounces at [mailto:memcached-bounces at]On Behalf Of Steve Grimm
Sent: Thursday, May 03, 2007 11:33 AM
To: Sam Lavery; memcached at
Subject: Re: Largest production memcached install?

No clue if we're the largest installation, but Facebook has roughly 200 dedicated memcached servers in its production environment, plus a small number of others for development and so on. A few of those 200 are hot spares. They are all 16GB 4-core AMD64 boxes, just because that's where the price/performance sweet spot is for us right now (though it looks like 32GB boxes are getting more economical lately, so I suspect we'll roll out some of those this year.)

We have a home-built management and monitoring system that keeps track of all our servers, both memcached and other custom backend stuff. Some of our other backend services are written memcached-style with fully interchangeable instances; for such services, the monitoring system knows how to take a hot spare and swap it into place when a live server has a failure. When one of our memcached servers dies, a replacement is always up and running in under a minute.

All our services use a unified database-backed configuration scheme which has a Web front-end we use for manual operations like adding servers to handle increased load. Unfortunately that management and configuration system is highly tailored to our particular environment, but I expect you could accomplish something similar on the monitoring side using Nagios or another such app.

All that said, I agree with the earlier comment on this list: start small to get some experience running memcached in a production environment. It's easy enough to expand later once you have appropriate expertise and code in place to make things run smoothly.


On 5/3/07 8:06 AM, "Sam Lavery" <sam.lavery at> wrote:

Does anyone know what the largest installation of memcached currently is?  I'm considering putting it on 100+ machines(solaris/mod_perl), and would love to hear any tips people have for managing a group of that size(and larger).  Additionally, are there any particular patches I should try out for this specific platform? 
Thanks in advance,

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