G1 GC heap size is not bounded ?

[yao]

Hi Jenny,

I've already enabled this option, do you know which parts in gc logs show
the native memory stats info ?

Thanks
Shengzhe


On Mon, Feb 10, 2014 at 12:58 PM, YU ZHANG <yu.zhang at oracle.com> wrote:

>  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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