G1 GC heap size is not bounded ?

[Srinivas Ramakrishna]

Hi Shengzhe --

What's the version of JDK where you're running into this issue, and has the
JVM had any STW full gc's because of mixed gc's not keeping up?

-- ramki


On Mon, Feb 10, 2014 at 11:39 AM, yao <yaoshengzhe at gmail.com> 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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