Degenerated GC

[Aleksey Shipilev]

On 01/18/2018 08:51 PM, Aleksey Shipilev wrote:
> On 01/18/2018 04:18 PM, Aleksey Shipilev wrote:
>> http://cr.openjdk.java.net/~shade/shenandoah/degenerated-gc/webrev.01/
> 
> Amped up alloc-failure injection, and that exposed a few bugs. Fixed them:
>   http://cr.openjdk.java.net/~shade/shenandoah/degenerated-gc/webrev.02/
> 
> GCBasher runs for half an hour now without problems. Running further...

8-hour GCBasher passes with:

$ -Xmx1g -XX:+UseShenandoahGC -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions
-XX:ShenandoahGCHeuristics=aggressive -XX:+ShenandoahDegenerateALot TestGCBasherWithShenandoah 28800000

[27665.812s][info][gc,stats       ] 85556 successful concurrent GCs
[27665.812s][info][gc,stats       ]      0 invoked explicitly
[27665.812s][info][gc,stats       ]
[27665.812s][info][gc,stats       ] 44995 Degenerated GCs
[27665.812s][info][gc,stats       ]   44995 caused by allocation failure
[27665.812s][info][gc,stats       ]   8628 upgraded to Full GC
[27665.812s][info][gc,stats       ]
[27665.812s][info][gc,stats       ] 8758 Full GCs
[27665.812s][info][gc,stats       ]      0 invoked explicitly
[27665.812s][info][gc,stats       ]    130 caused by allocation failure
[27665.812s][info][gc,stats       ]   8628 upgraded from Degenerated GC

So, I am pretty sure it works :)

-Aleksey