RFR (S): 8245129: Enhance jstat gc option output and tests

[Hohensee, Paul]

Please review an enhancement to the jstat gc option output to make the columns wider (for up to a 2TB heap) so one can read the output without going cross-eyed.

Bug: https://bugs.openjdk.java.net/browse/JDK-8245129
Webrev: http://cr.openjdk.java.net/~phh/8245129/webrev.00/


I added tests using ParallelGC since the output can differ for non-G1 collectors. Successfully ran the test/hotspot/jtreg/serviceability/tmtools/jstat and test/jdk/sun/tools/jstat tests. A submit repo run had one failure


runtime/MemberName/MemberNameLeak.java

tier1

macosx-x64-debug



but rerunning it on my laptop succeeded, and there’s no connection between this test and my patch.



Thanks,

Paul



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