Troubleshooting a ~40-second minor collection

[Aaron Daubman]

>
> Would it help to narrow the GC logs I have to around the time of the long
> minor GC events and include them?
>

I've attached (trying one more time with higher bz2 compression to get
through the 100K limit) the log for the 12minute period where the two
largest pauses occurred and Context Switching became high on one of the
servers.
Over this 12 minutes GCViewer reports there were a total of 243 pauses
causing 10.2s total pause time.
Max pause was 3.45s and the max pause interval was 5.5s

The log starts off close to the largest 3.45s collection time:
2013-12-02T16:28:37.838-0500: 2060.900: [GC pause (young) 2060.900:
[G1Ergonomics (CSet Construction) start choosing CSet, predicted base time:
5.92 ms, remaining time: 44.08 ms, target pause time: 50.00 ms]
 2064.332: [G1Ergonomics (CSet Construction) add young regions to CSet,
eden: 1238 regions, survivors: 8 regions, predicted young region time:
13.50 ms]
 2064.332: [G1Ergonomics (CSet Construction) finish choosing CSet, eden:
1238 regions, survivors: 8 regions, old: 0 regions, predicted pause time:
19.42 ms, target pause time: 50.00 ms]
, 3.45061000 secs]

It finishes near the second largest time:
2013-12-02T16:40:43.116-0500: 2786.177: [GC pause (young) 2786.177:
[G1Ergonomics (CSet Construction) start choosing CSet, predicted base time:
5.88 ms, remaining time: 44.12 ms, target pause time: 50.00 ms]
 2786.177: [G1Ergonomics (CSet Construction) add young regions to CSet,
eden: 1196 regions, survivors: 4 regions, predicted young region time:
21.35 ms]
 2788.769: [G1Ergonomics (CSet Construction) finish choosing CSet, eden:
1196 regions, survivors: 4 regions, old: 0 regions, predicted pause time:
27.23 ms, target pause time: 50.00 ms]
, 2.60856700 secs]

This was all from minor (young) collections.

Thanks again,
     Aaron
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