Consecutive Full GCs but no OOM

[Thomas Schatzl]

Hi,

On Mon, 2018-05-14 at 15:29 -0600, Shawn Heisey wrote:
> On 5/14/2018 1:45 PM, Thomas Schatzl wrote:
> >   I did not think this is actually documented - I had to look at
> > the
> > code :)
> > 
> > There is a flag called AdaptiveSizePolicyGCTimeLimitThreshold
> > (default:
> > 5) which defines the amount of consecutive GCs that need to exceed
> > these thresholds to result in an OOME. That counter is reset at the
> > first GC not exceeding the thresholds.
> > 
> > I hope this was what you were asking for.
> 
> Yep, that's exactly what I was looking for.  Expected a timeframe
> (perhaps one or five minutes) rather than a collection count, but as
> long as the check is well-written, I don't think that's a problem.  I
> have done very little diving into Java's source code, so I can't
> comment about how good it is.
> 

  if you want to see the gory details, look at
AdaptiveSizePolicy::check_gc_overhead_limit() (line 471+) in http://hg.
openjdk.java.net/jdk8u/jdk8u60/hotspot/file/37240c1019fd/src/share/vm/g
c_implementation/shared/adaptiveSizePolicy.cpp

Thanks,
  Thomas