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From secondspan <>
Subject Re: ActiveMQ 5.6 CPU steadily increases but drops at noon and midnight exactly?
Date Wed, 25 Jul 2012 20:42:15 GMT

Downgrading to JDK 1.6 from 1.7 resolves the strange ever-growing CPU

Interestingly, the top thread in terms of CPU usage becomes the "Selector
Worker: 0" after the downgrade. 

I agree it feels like a livelock of some sort that spontaneously resolves
itself every 12 hours.  

I can foresee spending some more time doing load testing against an ActiveMQ
instance on JDK 1.7 in a staging environment in the future with extra
logging enabled, but we're likely to defer any further investigation since
running an older JDK allows us to move onto other production matters and
defer this problem until the broader community attempts to run ActiveMQ on

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