jm + thread-priorities   1

Hack workaround to get JVM thread priorities working on Linux
As used in Cassandra ( http://grokbase.com/t/hbase/dev/13bf9kezes/about-xx-threadprioritypolicy-42 )!
if you just set the "ThreadPriorityPolicy" to something else than the legal values 0 or 1, [...] a slight logic bug in Sun's JVM code kicks in, and thus sets the policy to be as if running with root - thus you get exactly what one desire. The operating system, Linux, won't allow priorities to be heightened above "Normal" (negative nice value), and thus just ignores those requests (setting it to normal instead, nice value 0) - but it lets through the requests to set it lower (setting the nice value to some positive value).
cassandra  thread-priorities  threads  java  jvm  linux  nice  hacks 
january 2015 by jm

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