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From Andrey Stepachev <oct...@gmail.com>
Subject Re: Java Commited Virtual Memory significally larged then Heap Memory
Date Tue, 11 Jan 2011 14:57:12 GMT
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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