G1gc compaction algorithm

[Martin Makundi]

Hi!

We suffered a couple of Full GC's using regionsize 5M (it seems to be exact
looking at logged actual parameters) and we tried the 16M option and this
resulted in more severe Full GC behavior.

Here is the promised log for 16 M setting:
http://81.22.250.165/log/gc-16m.log

We switch back to 5M hoping it will behave more nicely.

**
Martin
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