Bug in G1 logging?
Thomas Viessmann
thomas.viessmann at oracle.com
Mon Jun 15 08:52:42 UTC 2015
Sure:
CommandLine flags: -XX:+DisableExplicitGC
-XX:+ExplicitGCInvokesConcurrent -XX:G1LogLevel=finest
-XX:+G1SummarizeRSetStats -XX:G1Summari
zeRSetStatsPeriod=1 -XX:+G1TraceReclaimDeadHumongousObjectsAtYoungGC
-XX:GCLogFileSize=104857600 -XX:+HeapDumpOnOutOfMemoryError -XX:Hea
pDumpPath=/icebackups/DashboardFiles/logs
-XX:InitialHeapSize=25769803776 -XX:MaxGCPauseMillis=400
-XX:MaxHeapSize=25769803776 -XX:MaxMe
taspaceSize=536870912 -XX:MetaspaceSize=268435456
-XX:NumberOfGCLogFiles=10 -XX:+ParallelRefProcEnabled
-XX:+PrintAdaptiveSizePolicy -XX
:+PrintGC -XX:+PrintGCCause -XX:+PrintGCDateStamps -XX:+PrintGCDetails
-XX:+PrintGCTimeStamps -XX:+PrintHeapAtGC -XX:+PrintTenuringDistr
ibution -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions
-XX:+UseCompressedClassPointers -XX:+UseCompressedOops -XX:+UseG
1GC -XX:+UseGCLogFileRotation
Java HotSpot(TM) 64-Bit Server VM (25.40-b25) for linux-amd64 JRE
(1.8.0_40-b25), built on Feb 10 2015 21:29:53 by "java_re" with gcc 4.
3.0 20080428 (Red Hat 4.3.0-8)
Memory: 4k page, physical 65743256k(31795400k free), swap
16777208k(16777208k free)
On 15/06/2015 10:50, Thomas Schatzl wrote:
> Hi,
>
> On Mon, 2015-06-15 at 10:41 +0200, Thomas Viessmann wrote:
>> Hi all,
>>
>> There is probably a bug in G1 logging in 8u40. The total of [Other:
>> 214.0 ms]
>> does not match the sum of its sub-categories which amount to just 9.2 ms.
>> Hence at least one of these is supposedly wrong. Is this a known bug or
>> should I file a new one?
> Can you provide at least command line parameters to see if some (not
> mentioned) logging/verification/diagnostic option causes this?
>
>> [Code Root Fixup: 0.1 ms]
>> [Code Root Purge: 0.0 ms]
>> [Clear CT: 2.0 ms]
>> [Other: 214.0 ms]<<<<<<<<<<<<<<<<<<
>> [Choose CSet: 0.0 ms]
>> [Ref Proc: 4.9 ms]
>> [Ref Enq: 0.3 ms]
>> [Redirty Cards: 2.1 ms]
>> [Parallel Redirty: 1.8 1.8 1.7 1.7 1.7 1.7 1.7 1.7
>> 1.7 1.7 1.6 1.6 1.6
>> Min: 1.6, Avg: 1.7, Max: 1.8, Diff: 0.2, Sum: 22.1]
>> [Redirtied Cards: 27319 24512 23040 24635 18996 28913
>> 20628 19163 17881 17664 15360 18417 16639
>> Min: 15360, Avg: 21012.8, Max: 28913, Diff: 13553, Sum: 273167]
>> [Humongous Reclaim: 0.0 ms]
>> [Humongous Total: 11]
>> [Humongous Candidate: 0]
>> [Humongous Reclaimed: 0]
>> [Free CSet: 1.9 ms]
>> [Young Free CSet: 1.9 ms]
>> [Non-Young Free CSet: 0.0 ms]
>> [Eden: 3400.0M(3232.0M)->0.0B(848.0M) Survivors: 176.0M->376.0M
>> Heap: 12.6G(24.0G)->9673.3M(24.0G)]
> Thanks,
> Thomas
>
>
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