Measuring time spent on GC in JVM

Question

Suppose I am testing a Java server application. I know how much time it takes to finish the test. Now I'd like to know how much was spent on GC during that test. How can I do it?

Answer 1

The simplest way is to use the -Xloggc and -XX:-PrintGCTimeStamps options when starting up your JVM. I think it prints out how long garbage collection takes.

http://www.oracle.com/technetwork/java/javase/tech/vmoptions-jsp-140102.html