Memcached Results, Continued

in Performance
August 20th, 2013

My last post end with a few questions. I realized as I was writing them that I had an easy way to answer one of them — “How much (if any) would response times improve by moving memcached to servers that were not overloaded serving web requests?”.

memcached-benchmarks-prod-averages-02

This graph is similar to this one from my previous post, but adds a fourth server to the memcached pool: ist-wp-app-prod04. When I ran these benchmarks, app-prod04 was not yet accepting web requests, and as such is representative of response times we might see if the memcached instance was not running on a busy app server.

Response times from app-prod04 are nearly 50% quicker than the other remote instances (app-prod02 and 03). Again the benchmark was run from ist-wp-app-prod01, so response times from that instance are still (understandably) the quickest.

Seems like a good argument for moving memcached off of the app servers…

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