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[memory ][Wed Nov 14 08:09:57 2012][YC#818] 15067.458-15067.894: YC
7322811KB->6584405KB (8388608KB), 0.436 s, sum of pauses 435.444 ms,
longest pause 435.444 ms.
[memory ][Wed Nov 14 08:10:11 2012][YC#819] 15081.383-15081.768: YC
7512189KB->6782798KB (8388608KB), 0.385 s, sum of pauses 384.824 ms,
longest pause 384.824 ms.
[memory ][Wed Nov 14 08:10:24 2012][YC#820] 15094.544-15094.880: YC
7692285KB->6943754KB (8388608KB), 0.336 s, sum of pauses 335.365 ms,
longest pause 335.365 ms.
[memory ][Wed Nov 14 08:10:51 2012][YC#821] 15121.342-15121.577: YC
7835691KB->7046223KB (8388608KB), 0.235 s, sum of pauses 235.032 ms,
longest pause 235.032 ms.
[memory ][Wed Nov 14 08:11:21 2012][YC#822] 15151.297-15151.591: YC
8017711KB->7260111KB (8388608KB), 0.293 s, sum of pauses 293.211 ms,
longest pause 293.211 ms.
[memory ][Wed Nov 14 08:11:48 2012][YC#823] 15178.616-15178.911: YC
8154226KB->7381651KB (8388608KB), 0.294 s, sum of pauses 294.275 ms,
longest pause 294.275 ms.
[memory ][Wed Nov 14 08:12:06 2012][OC#56] 15193.571-15196.865: OC
7865756KB->6253164KB (8388608KB), 3.294 s, sum of pauses 3156.793 ms,
longest pause 3156.793 ms.
There are six Young Collections (YC) before an Old Collection (OC) or full GC. There is an
interval of about three minutes between full GCs.
The following log snippet is the verbose output pattern during the high load at 9:45 AM. Note
the difference from the first snippet. There are several full GCs in the sequence (OC) that can
indicate an excessive utilization of the heap:
[memory ][Wed Nov 14 09:45:40 2012][YC#5842] 20810.279-20810.310: YC
7864695KB->7858455KB (8388608KB), 0.030 s, sum of pauses 29.888 ms,
longest pause 29.888 ms.
[memory ][Wed Nov 14 09:45:40 2012][YC#5843] 20810.331-20810.380: YC
7867299KB->7863260KB (8388608KB), 0.049 s, sum of pauses 41.743 ms,
longest pause 41.743 ms.
[memory ][Wed Nov 14 09:45:40 2012][YC#5844] 20810.394-20810.447: YC
7872603KB->7866498KB (8388608KB), 0.053 s, sum of pauses 27.567 ms,
longest pause 27.567 ms.
[memory ][Wed Nov 14 09:45:46 2012][OC#422] 20810.448-20816.019: OC
7867363KB->7136145KB (8388608KB), 5.570 s, sum of pauses 5400.986 ms,
longest pause 5400.986 ms.
[memory ][Wed Nov 14 09:45:51 2012][OC#423] 20816.061-20821.829: OC
7203083KB->7145813KB (8388608KB), 5.768 s, sum of pauses 5534.001 ms,
longest pause 5534.001 ms.
[memory ][Wed Nov 14 09:45:57 2012][OC#424] 20821.988-20827.727: OC
7179027KB->7148829KB (8388608KB), 5.739 s, sum of pauses 5533.360 ms,
longest pause 5533.360 ms.
[memory ][Wed Nov 14 09:46:03 2012][OC#425] 20827.738-20833.656: OC
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