IBM User Guide for Java V7 on Windows > Troubleshooting and support > Using diagnostic tools > JIT and AOT problem determination

JVM behavior during idle periods

You can reduce the CPU cycles consumed by an idle JVM by using the -XsamplingExpirationTime option to turn off the JIT sampling thread.

The JIT sampling thread profiles the running Java™ application to discover commonly used methods. The memory and processor usage of the sampling thread is negligible, and the frequency of profiling is automatically reduced when the JVM is idle.

In some circumstances, you might want no CPU cycles consumed by an idle JVM. To do so, specify the -XsamplingExpirationTime<time> option. Set <time> to the number of seconds for which you want the sampling thread to run. Use this option with care; after it is turned off, you cannot reactivate the sampling thread. Allow the sampling thread to run for long enough to identify important optimizations.

Parent: JIT and AOT problem determination

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