understanding GC logs

Ramki Ramakrishna y.s.ramakrishna at oracle.com
Wed Aug 3 11:07:52 PDT 2011



On 8/3/2011 10:45 AM, Darji, Kinnari wrote:
>
> Hello GC team,
>
> What does this all different time mean? Can someone please clarify?
>
> What is the time application when application stops?
>
> [GC 9768.668: [ParNew
>
            ^^^^^^ JVM timestamp (seconds since start of JVM) at start 
of GC operation)
>
>    3746 Desired survivor size 10878976 bytes, new threshold 4 (max 4)
>
>    3747 - age   1:     594288 bytes,     594288 total
>
>    3748 - age   2:    2369912 bytes,    2964200 total
>
>    3749 - age   3:    2877584 bytes,    5841784 total
>
>    3750 - age   4:    3075264 bytes,    8917048 total
>
>    3751 : 182066K->12384K(191744K), 0.0089120 secs] 
> 2755986K->2586303K(10710272K), 0.0092180 secs]
>
                                                            ^^^^^^^^ 
                                                            ^^^^^^^
                                                           Duration of 
Scavenge                                        Duration of whole GC 
operation
                                                                                                                                       (includes scavenge)
>
> [Times: user=0.09 sys=0.00, real=0.01 secs]
>
      ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ Process virtual user and system 
times, and real (elapsed) time during GC operation.

The time for which the application threads were stopped is about 9.2 ms.

-- ramki
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