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From Xavier Stevens <xstev...@mozilla.com>
Subject Re: Java Commited Virtual Memory significally larged then Heap Memory
Date Tue, 11 Jan 2011 16:43:23 GMT
Are you using a newer linux kernel with the new and "improved" memory
allocator?

If so try setting this in hadoop-env.sh:

export MALLOC_ARENA_MAX=<number of cores you want to use>

Maybe start by setting it to 4.  You can thank Todd Lipcon if this works
for you.

Cheers,


-Xavier

On 1/11/11 7:24 AM, Andrey Stepachev wrote:
> No. I don't use LZO. I tried even remove any native support (i.e. all .so
> from class path)
> and use java gzip. But nothing.
>
>
> 2011/1/11 Friso van Vollenhoven <fvanvollenhoven@xebia.com>
>
>> Are you using LZO by any chance? If so, which version?
>>
>> Friso
>>
>>
>> On 11 jan 2011, at 15:57, Andrey Stepachev wrote:
>>
>>> After starting the hbase in jroĐükit found the same memory leakage.
>>>
>>> After the launch
>>>
>>> Every 2,0 s: date & & ps - sort =- rss-eopid, rss, vsz, pcpu | head
>>> Tue Jan 11 16:49:31 2011
>>>
>>>   11 16:49:31 MSK 2011
>>>   PID RSS VSZ% CPU
>>>  7863 2547760 5576744 78.7
>>>
>>>
>>>
>>> JR dumps:
>>>
>>> Total mapped 5576740KB (reserved = 2676404KB) - Java heap 2048000KB
>>> (reserved = 1472176KB) - GC tables 68512KB - Thread stacks 37236KB (#
>>> threads = 111) - Compiled code 1048576KB (used = 2599KB) - Internal
>>> 1224KB - OS 549688KB - Other 1800976KB - Classblocks 1280KB (malloced
>>> = 1110KB # 3285) - Java class data 20224KB (malloced = 20002KB # 15134
>>> in 3285 classes) - Native memory tracking 1024KB (malloced = 325KB +10
>>> KB # 20)
>>>
>>>
>>>
>>> After running the mr which make high write load (~1hour)
>>>
>>> Every 2,0 s: date & & ps - sort =- rss-eopid, rss, vsz, pcpu | head
>>> Tue Jan 11 17:08:56 2011
>>>
>>>   11 17:08:56 MSK 2011
>>>   PID RSS VSZ% CPU
>>>  7863 4072396 5459572 100
>>>
>>>
>>>
>>> JR said not important below specify why)
>>>
>>> http://paste.ubuntu.com/552820/
>>> <http://paste.ubuntu.com/552820/>
>>>
>>>
>>> 7863:
>>> Total mapped                  5742628KB +165888KB (reserved=1144000KB
>>> -1532404KB)
>>> -              Java heap      2048000KB           (reserved=0KB
>> -1472176KB)
>>> -              GC tables        68512KB
>>> -          Thread stacks        38028KB    +792KB (#threads=114 +3)
>>> -          Compiled code      1048576KB           (used=3376KB +776KB)
>>> -               Internal         1480KB    +256KB
>>> -                     OS       517944KB  -31744KB
>>> -                  Other      1996792KB +195816KB
>>> -            Classblocks         1280KB           (malloced=1156KB
>>> +45KB #3421 +136)
>>> -        Java class data        20992KB    +768KB (malloced=20843KB
>>> +840KB #15774 +640 in 3421 classes)
>>> - Native memory tracking         1024KB           (malloced=325KB +10KB
>> #20)
>>>
>>>
>> +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
>>>    OS                          *java    r x 0x0000000000400000.(
>> 76KB)
>>>    OS                          *java    rw  0x0000000000612000 (
>>  4KB)
>>>    OS                        *[heap]    rw  0x0000000000613000.(
>> 478712KB)
>>>   INT                           Poll    r   0x000000007fffe000 (
>>  4KB)
>>>   INT                         Membar    rw  0x000000007ffff000.(
>>  4KB)
>>>   MSP              Classblocks (1/2)    rw  0x0000000082ec0000 (
>>  768KB)
>>>   MSP              Classblocks (2/2)    rw  0x0000000082f80000 (
>>  512KB)
>>>  HEAP                      Java heap    rw
>>  0x0000000083000000.(2048000KB)
>>>                                         rw  0x00007f2574000000 (
>>  65500KB)
>>>                                             0x00007f2577ff7000.(
>> 36KB)
>>>                                         rw  0x00007f2584000000 (
>>  65492KB)
>>>                                             0x00007f2587ff5000.(
>> 44KB)
>>>                                         rw  0x00007f258c000000 (
>>  65500KB)
>>>                                             0x00007f258fff7000 (
>> 36KB)
>>>                                         rw  0x00007f2590000000 (
>>  65500KB)
>>>                                             0x00007f2593ff7000 (
>> 36KB)
>>>                                         rw  0x00007f2594000000 (
>>  65500KB)
>>>                                             0x00007f2597ff7000 (
>> 36KB)
>>>                                         rw  0x00007f2598000000 (
>> 131036KB)
>>>                                             0x00007f259fff7000 (
>> 36KB)
>>>                                         rw  0x00007f25a0000000 (
>>  65528KB)
>>>                                             0x00007f25a3ffe000 (
>>  8KB)
>>>                                         rw  0x00007f25a4000000 (
>>  65496KB)
>>>                                             0x00007f25a7ff6000 (
>> 40KB)
>>>                                         rw  0x00007f25a8000000 (
>>  65496KB)
>>>                                             0x00007f25abff6000 (
>> 40KB)
>>>                                         rw  0x00007f25ac000000 (
>>  65504KB)
>>>
>>>
>>> So, the difference was in the pieces of memory like this:
>>>
>>> rw 0x00007f2590000000 (65500KB)
>>>     0x00007f2593ff7000 (36KB)
>>>
>>>
>>> Looks like HLog allocates memory (looks like HLog, becase it is very
>> similar
>>> size)
>>>
>>> If we count this blocks we get amount of lost memory:
>>>
>>> 65M * 32 + 132M = 2212M
>>>
>>> So, it looks like HLog allcates to many memory, and question is: how to
>>> restrict it?
>>>
>>> 2010/12/30 Andrey Stepachev <octo47@gmail.com>
>>>
>>>> Hi All.
>>>>
>>>> After heavy load into hbase (single node, nondistributed test system) I
>> got
>>>> 4Gb process size of my HBase java process.
>>>> On 6GB machine there was no room for anything else (disk cache and so
>> on).
>>>> Does anybody knows, what is going on, and how you solve this. What heap
>>>> memory is set on you hosts
>>>> and how much of RSS hbase process actually use.
>>>>
>>>> I don't see such things before, all tomcat and other java apps don't
>> eats
>>>> significally more memory then -Xmx.
>>>>
>>>> Connection name:   pid: 23476 org.apache.hadoop.hbase.master.HMaster
>>>> start   Virtual Machine:   Java HotSpot(TM) 64-Bit Server VM version
>>>> 17.1-b03   Vendor:   Sun Microsystems Inc.   Name:   23476@mars
>>  Uptime:   12
>>>> hours 4 minutes   Process CPU time:   5 hours 45 minutes   JIT compiler:
>>   HotSpot
>>>> 64-Bit Server Compiler   Total compile time:   19,223 seconds
>>>> ------------------------------
>>>>    Current heap size:     703 903 kbytes   Maximum heap size:   2 030
>> 976kbytes    Committed memory:
>>>> 2 030 976 kbytes   Pending finalization:   0 objects      Garbage
>>>> collector:   Name = 'ParNew', Collections = 9 990, Total time spent = 5
>>>> minutes   Garbage collector:   Name = 'ConcurrentMarkSweep', Collections
>> =
>>>> 20, Total time spent = 35,754 seconds
>>>> ------------------------------
>>>>    Operating System:   Linux 2.6.34.7-0.5-xen   Architecture:   amd64
>>  Number of processors:
>>>> 8   Committed virtual memory:   4 403 512 kbytes     Total physical
>>>> memory:   6 815 744 kbytes   Free physical memory:      82 720 kbytes
>>  Total swap space:
>>>> 8 393 924 kbytes   Free swap space:   8 050 880 kbytes
>>>>
>>>>
>>>>
>>>>
>>

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