G1 GC heap size is not bounded ?

[YU ZHANG]

Shengzhe,

Can you get native memory statistics?  It should at least give some idea 
which part of native memory is growing.  You need

-XX:+UnlockDiagnosticVMOptions

to print native memory data.

Thanks,
Jenny

On 2/10/2014 11:39 AM, yao wrote:
> Hi All,
>
> We've enabled G1 GC on our cluster for about 1 month and recently we 
> observed the heap size keeps growing (via RES column in top), though 
> very slowly. My question is, is there a way to bound heap size for G1 GC ?
>
> We set heap size to 82G
>
> /-Xms83868m -Xmx83868m -XX:+UnlockExperimentalVMOptions -XX:+UseG1GC
> /
> We found RES column is about 100G, (a few days ago it was about 93G)
>
> *$ top*
> PID USER      PR  NI  VIRT  RES  SHR S %CPU %MEM    TIME+ COMMAND
> 5757 hbase     20   0  104g *100g* 5240 S 271.3 79.6 177771:41 java
>
> From previous discussion, Thomas Schatzl pointed out this might be due 
> to large RSet. From below lines in gc log, we found RSet size is about 
> 10.5G. So we get Xmx + RSet = 82G + 10.5G = 92.5G, here you can see 
> there are still unexplained 7.5G data occupied our off-heap.
>
> RSet log:
>
> / Concurrent RS processed -1601420092 cards
>   Of 651507426 completed buffers:
>      634241940 ( 97.3%) by conc RS threads.
>      17265486 (  2.7%) by mutator threads.
>   Conc RS threads times(s)
>           0.00     0.00     0.00     0.00     0.00 0.00     0.00     
> 0.00     0.00     0.00     0.00 0.00     0.00     0.00     0.00     
> 0.00     0.00 0.00    \
>  0.00     0.00     0.00     0.00     0.00     0.00
>   Total heap region rem set sizes = 10980692K.  Max = 16182K.
>   Static structures = 563K, free_lists = 78882K.
>     197990656 occupied cards represented.
>     Max size region = 
> 165:(O)[0x00007f0ce0000000,0x00007f0ce2000000,0x00007f0ce2000000], 
> size = 16183K, occupied = 3474K.
>     Did 0 coarsenings./
>
> Thanks
> -Shengzhe
>
>
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