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List:       openjdk-hotspot-gc-use
Subject:    ParNew garbage collection
From:       kinnari.darji () citi ! com (Darji, Kinnari )
Date:       2012-01-10 16:24:01
Message-ID: 21ED8E3420CDB647B88C7F80A7D64DAC06F0901CA6 () exnjmb89 ! nam ! nsroot ! net
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I am using jdk-1.6.0_16 version. Is there any known issue with this version?
Also I have tried +PrintSafepointStatistics option in past but it prints out time \
which does not actual correlate to the time. It is hard to match it up the occurrence \
of event. I will try with TraceSafepointCleanup option.

Thank you
Kinnari

From: hotspot-gc-use-bounces@openjdk.java.net [mailto:hotspot-gc-use-bounces at \
                openjdk.java.net] On Behalf Of Srinivas Ramakrishna
Sent: Wednesday, January 04, 2012 12:54 PM
To: Jon Masamitsu
Cc: hotspot-gc-use at openjdk.java.net
Subject: Re: ParNew garbage collection

May be also +PrintSafepointStatistics (and related parms) to drill down a bit \
further, although TraceSafepointCleanup would probably provide all of the info on a \
per-safepoint basis. There was an old issue wrt monitor deflation that was foixed a \
few releases ago, so Kinnari should check the version of the JVM she's running on as \
well.... (There are now a couple of flags related to monitor list handling policies i \
believe but i have no experience with them and do not have the code in front of me -- \
make sure to cc the runtime list if that turns out to be the issue again and you are \
already on a very recent version of the JVM.)

-- ramki
On Wed, Jan 4, 2012 at 9:43 AM, Jon Masamitsu <jon.masamitsu at \
oracle.com<mailto:jon.masamitsu at oracle.com>> wrote: Try turning on \
TraceSafepointCleanupTime.  I haven't used it myself.  If that's not it, look in \
share/vm/runtime/globals.hpp for some other flag that traces safepoints.


On 1/3/2012 1:36 PM, Darji, Kinnari wrote:

Hello GC team,

I have question regarding ParNew collection. As in logs below, the GC is taking only \
0.04 sec but application was stopped for 1.71 sec. What could possibly cause this? \
Please advise.



2012-01-03T14:37:04.975-0500: 30982.368: [GC 30982.368: [ParNew

Desired survivor size 19628032 bytes, new threshold 4 (max 4)

- age   1:    4466024 bytes,    4466024 total

- age   2:    3568136 bytes,    8034160 total

- age   3:    3559808 bytes,   11593968 total

- age   4:    1737520 bytes,   13331488 total

> 330991K->18683K(345024K), 0.0357400 secs] 5205809K->4894299K(26176064K), 0.0366240 \
> secs] [Times: user=0.47 sys=0.04, real=0.04 secs]

Total time for which application threads were stopped: 1.7197830 seconds

Application time: 8.4134780 seconds







Thank you

Kinnari







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