如何为Java的GC日志指定时区？

Question

I've configured my JVM to write Garbage Collection stats to a log file, with options like:

-XX:+PrintGCDetails -XX:+PrintGCDateStamps -Xloggc:gc.log -XX:+UseGCLogFileRotation -XX:NumberOfGCLogFiles=1 -XX:GCLogFileSize=64M

The problem is, my application's server log uses UTC for log messages, but the GC log uses the server time zone, which is currently 4 hours behind UTC. This makes it a little harder to reconcile events in my server log with GC pauses.

Is there any way to configure which time zone the Java GC log uses?

I'm on Java 7.

Answer 1

If you are on Linux you can set TZ variable to UTC . Eg

TZ=UTC java -XX:+PrintGCDetails -XX:+PrintGCDateStamps -Xloggc:gc.log -XX:+UseGCLogFileRotation -XX:NumberOfGCLogFiles=1 -XX:GCLogFileSize=64M SomeClass

Or globally (or in a script, that starts your application):

export TZ=UTC

This will modify the timestamps of java GC log.