GC Report Detail Explanation

I want to make sure that I am interpeting the GC report correctly. Specifically, the "maximum GC pauses" values.
Since there is a a Young and Old section that includes this value, which one (or does both) describe the full application pause.
Due to our legacy app considerations, we have to make sure that the GC does not halt the application for more than 1 second. (We are using the pausetarget argument, but it is my understanding that this is a "goal" and not a hard and fast policy for the JVM to follow.)
[memory ][Fri May 18 10:14:32 2007][09964] Memory usage report
[memory ][Fri May 18 10:14:32 2007][09964]
[memory ][Fri May 18 10:14:32 2007][09964] young collections
[memory ][Fri May 18 10:14:32 2007][09964] number of collections = 18
[memory ][Fri May 18 10:14:32 2007][09964] total promoted = 445233 (size 18511512)
[memory ][Fri May 18 10:14:32 2007][09964] max promoted = 39227 (size 1507256)
[memory ][Fri May 18 10:14:32 2007][09964] total GC time = 0.744 s
[memory ][Fri May 18 10:14:32 2007][09964] mean GC time = 41.337 ms
[memory ][Fri May 18 10:14:32 2007][09964] maximum GC Pauses = 41.570 , 42.784, 49.517 ms
[memory ][Fri May 18 10:14:32 2007][09964]
[memory ][Fri May 18 10:14:32 2007][09964] old collections
[memory ][Fri May 18 10:14:32 2007][09964] number of collections = 71
[memory ][Fri May 18 10:14:32 2007][09964] total promoted = 75107 (size 3027680)
[memory ][Fri May 18 10:14:32 2007][09964] max promoted = 69770 (size 2505288)
[memory ][Fri May 18 10:14:32 2007][09964] total GC time = 44.850 s (pause 12.647 s)
[memory ][Fri May 18 10:14:32 2007][09964] mean GC time = 631.685 ms (pause 178.123 ms)
[memory ][Fri May 18 10:14:32 2007][09964] maximum GC Pauses = 236.930 , 255.046, 267.325 ms
[memory ][Fri May 18 10:14:32 2007][09964]
[memory ][Fri May 18 10:14:32 2007][09964] number of concurrent mark phases = 71
[memory ][Fri May 18 10:14:32 2007][09964] number of concurrent sweep phases = 9
[memory ][Fri May 18 10:14:32 2007][09964] number of parallel sweep phases = 62

I want to make sure that I am interpeting the GC
report correctly. Specifically, the "maximum GC
pauses" values.
Since there is a a Young and Old section that
includes this value, which one (or does both)
describe the full application pause. The GC report is as you see divided up in two sections: one for young space (nursery) collections and one for old space. The "maximum GC pauses" is listed twice, for the max young and old space collections respectively. Both are shown for troubleshooting & tuning purposes. In your case, you are interested in the maximum of these two since that is what affects your SLA.
Due to our legacy app considerations, we have to make
sure that the GC does not halt the application for
more than 1 second. (We are using the pausetarget
argument, but it is my understanding that this is a
"goal" and not a hard and fast policy for the JVM to
follow.)Pausetarget is a soft goal except when using WebLogic Real Time and -Xgcprio:deterministic.
[memory ][Fri May 18 10:14:32 2007][09964] Memory
usage report
[memory ][Fri May 18 10:14:32 2007][09964] young
collections...
maximum GC Pauses = 41.570 , 42.784, 49.517...
[memory ][Fri May 18 10:14:32 2007][09964] old
collections
maximum GC Pauses = 236.930 , 255.046,
046, 267.325 msThe max application pause is the old space ~267 ms pause, which meets your < 1s requirement.
-- Henrik

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