JDK-8016479 : UseParallelGC collector does not return space to the OS when the heap shrinks.
  • Type: Bug
  • Component: hotspot
  • Sub-Component: gc
  • Affected Version: hs24,hs25
  • Priority: P2
  • Status: Resolved
  • Resolution: Cannot Reproduce
  • Submitted: 2013-06-12
  • Updated: 2014-03-20
  • Resolved: 2013-06-18
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Other
hs24Resolved
Related Reports
Relates :  
JDK-8037924 - CMM Testing: Check Min/MaxHeapFreeRatio flags allows to shrink the heap when using ParallelGC
Description
When the heap shrinks the space is not uncommitted as is expected.
Comments
Using a small test program, it has been demonstrated that UseParallelGC does shrink the committed space in the heap. This is both on hs24 and hs25. I've observed some behavior with runThese -quick that may be another problem. Still investigating that and will open a different CR if it is a real problem.
18-06-2013
Finally got a reply from above. This is now considered a P2 for hs24.
18-06-2013
Triaged for hs25.
17-06-2013
I was looking at the behavior on hotspot 25 and from that drew the conclusion that there was not a problem but I'm looking at hotspot 24 now and there is different behavior (maybe). Needs more investigation.
14-06-2013
I've the same runThese test that I recall running when I first thought this was a bug. From what I see now the problem does not exist.
14-06-2013
Will be closing this as not a bug.
14-06-2013
Yes, this is for density. If possible it should be fixed in hs24 since it is blocking other projects that are shipping with hs24 later this year.
13-06-2013
Moving this to 8-pool. I think this is for density, which is not hs24 or hs25.
13-06-2013
I think the problem is in PSVirtualSpace code. I did an initial investigation when I first realized this was a problem and that's as far as I got. Don't take that as a fact. More a recollection.
12-06-2013