Strage jmap heap output for G1 on 32bit JVM

Jakub Kubryński jk at codearte.io
Wed May 20 13:23:49 UTC 2015


64 bit Linux with 32bit JVM.

Cheers,
Jakub
20 maj 2015 15:18 "Jesper Wilhelmsson" <jesper.wilhelmsson at oracle.com>
napisał(a):

> Hi,
>
> Does this reproduce every time?
> What platform is it?
>
> I have tried to reproduce this on 32bit linux but can't see anything weird
> there. It seems likely that there is a variable with the wrong type
> somewhere on the way. I'll see if I can find something.
> /Jesper
>
>
> Jakub Kubryński skrev den 15/5/15 17:22:
>
>> Hi,
>>
>> I've just checked that on 32bit JVM (HotSpot 8u45) jmap reports strange
>> region
>> information for G1 collector. As you can see Xmx is set to 2G (which fits
>> MaxHeapSize) but regions count (almost 15k) and capacity is incorrect.
>> Any ideas
>> why?
>>
>> Heap Configuration:
>>     MinHeapFreeRatio         = 40
>>     MaxHeapFreeRatio         = 70
>>     MaxHeapSize              = 2147483648 (2048.0MB)
>>     NewSize                  = 1048576 (1.0MB)
>>     MaxNewSize               = 428867584 (409.0MB)
>>     OldSize                  = 4194304 (4.0MB)
>>     NewRatio                 = 2
>>     SurvivorRatio            = 8
>>     MetaspaceSize            = 16777216 (16.0MB)
>>     CompressedClassSpaceSize = 1073741824 (1024.0MB)
>>     MaxMetaspaceSize         = 4294963200 (4095.99609375MB)
>>     G1HeapRegionSize         = 1048576 (1.0MB)
>>
>> Heap Usage:
>> G1 Heap:
>>     regions  = 14336
>>     capacity = 15032385536 (14336.0MB)
>>     used     = 76347888 (72.81101989746094MB)
>>     free     = 14956037648 (14263.188980102539MB)
>>     0.5078893687043872% used
>>
>> --
>> Best regards,
>> Jakub Kubrynski
>>
>
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