ParNew garbage collection

[Srinivas Ramakrishna]

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>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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