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I'd like to enable jmxremote to monitor Apache Tomcat resources utilization with Munin, but I want to know if this will affect the servers performance, is so, how much will it be impacted.

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We monitor CPU usage on our servers(via SNMP) and when we enabled jmxremote to collect stats we did not see a noticeable appreciation in usage(real machines). It looks like someone actually grabbed stats from this and documented it:

They basically say it can vary based on app but saw as high as 5-6% cpu usage increase in some cases.

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