performancecopilot/parfait

Document the magic JVM flag to reduce CPU contention etc

tallpsmith opened this issue · 2 comments

This issue stems from the discovery many moons ago that for older Java+Linux Kernal combinations some of the Thread CPU metric collections were INSANELY SLOW.

To work around this, an evilly hidden JVM option was discovered: -XX:+UseLinuxPosixThreadCPUClocks

Which when active, drastically improved performance.

Since the option is enabled by default on OpenJDK 1.7+ perhaps this issue can be closed?