java GC pause time

Dear experts

I am using jdk 7 with
-XX : ParalleloldGC and -XX : ConcMarkandsweepGC

I would like to measure how much time is taken for GC pauses (in minor and major collections). Is there any way to
check that ?

Thx
royjaydAsked:
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CPColinSenior Java ArchitectCommented:
These command-line arguments turn on debug logging with the information you're looking for:

-XX:+PrintGC -XX:+PrintGCDateStamps

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dpearsonCommented:
Also if you decide to experiment with the G1 collector check out this option as well:

-XX:MaxGCPauseMillis=300

which lets you configure the max pause that you wish to allow.  It's pretty cool...

Doug
royjaydAuthor Commented:
@dpearson
I will be able to use maxgcpausemills with useparalleloldgc option as well right?
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dpearsonCommented:
Yes that appears to be correct.  I've mostly seen it used with the G1 collector but it appears to be valid with the others too.  Details on the flag are here:
http://docs.oracle.com/javase/7/docs/technotes/guides/vm/gc-ergonomics.html

Doug
royjaydAuthor Commented:
Is there any flag to check seperately how much time is taken by minor collection and
how much time is taken by major collection

thanks
CPColinSenior Java ArchitectCommented:
Probably not; you'll have to parse that yourself.
dpearsonCommented:
Yeah like CPColin says you need to parse the logs yourself.  FYI the format of the log statements changes depending on the GC algorithm that you're using - so watch out for that if you start experimenting with different algorithms.

Doug
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