IT05758: HIGH CPU USAGE CAUSED BY BTPOOL0-3 - ACCEPTOR0 SELECTCHANNELCONNECTOR

APAR status

• Closed as program error.

Error description

• High CPU usage caused by btpool0-3 - Acceptor0
  SelectChannelConnector
  
  Using the 'top' command the client determined that IBM Sterling
  B2B Integrator had the highest cpu usage:
  
         8275 gisadmin  18   0 10.0g 4.3g  11m S 973.6  6.9
  1247:39 /local/apps/SI52/p
  
  Then using command 'top -H' on this pid it was determined that
  thread btpool0-3 had the highest usage:
  
       8489 gisadmin  16   0 10.0g 4.3g  11m S 53.3  6.9
  118:24.73 btpool0-3 - Acc
  
  Thread dumps were taken at the time and here is thread for
  btpool0-3
  
  3XMTHREADINFO      "btpool0-3 - Acceptor0
  SelectChannelConnector@1xxx.xxx.xxx.xxx:20000"
  J9VMThread:0x000000000C534900, j9thread_t:0x00002B91D1F35670,
  java/lang/Thread:0x000000060180CCE8, state:CW, prio=5
  3XMJAVALTHREAD            (java/lang/Thread getId:0x3F,
  isDaemon:false)
  3XMTHREADINFO1            (native thread ID:0x2129, native
  priority:0x5, native policy:UNKNOWN)
  3XMTHREADINFO2            (native stack address range
  from:0x00002B91DCBC6000, to:0x00002B91DCC07000, size:0x41000)
  3XMCPUTIME               CPU usage total: 7333.344085464 secs
  3XMHEAPALLOC             Heap bytes allocated since last GC
  cycle=65536 (0x10000)
  3XMTHREADINFO3           Java callstack:
  4XESTACKTRACE                at
  org/mortbay/io/nio/SelectorManager$SelectSet.doSelect(SelectorMa
  nager.java:768(Compiled Code))
  4XESTACKTRACE                at
  org/mortbay/io/nio/SelectorManager.doSelect(SelectorManager.java
  :192(Compiled Code))
  4XESTACKTRACE                at
  org/mortbay/jetty/nio/SelectChannelConnector.accept(SelectChanne
  lConnector.java:124(Compiled Code))
  4XESTACKTRACE                at
  org/mortbay/jetty/AbstractConnector$Acceptor.run(AbstractConnect
  or.java:708(Compiled Code))
  4XESTACKTRACE                at
  org/mortbay/thread/BoundedThreadPool$PoolThread.run(BoundedThrea
  dPool.java:451)
  
                            Note: xxx.xxx.xxx.xxx:20000 is the IP
  and base port of this node.
  
  The high CPU issue has caused outages on Production system
  requiring system restart.
  
   java.lang.StackOverflowError error in the ui.log
  

Local fix

• STRRTC: 448351
  CR/CR
  Circumvention: None
  

Problem summary

• Users Affected:
  All
  
  Problem Description:
  High CPU usage caused by btpool0-3 - Acceptor0
  SelectChannelConnector
  
  Platforms Affected:
  All
  

Problem conclusion

• Resolution Summary:
  This fix is off by default. If you require this fix do the
  following steps.
  Add a property called usingNIOConnector=false in
  noapp.properties or add noapp.usingNIOConnector=false to
  customer_overrides.properties. Restart the instance. Verify in
  noapp.log.xxx that "Using
  org.mortbay.jetty.bio.SocketConnector!" is present in the file.
  By default, usingNIOConnector is set to true if the property
  does not exist.
  
  
  
  
  Delivered In:
  5104_6
  5020402_5
  5020500_1
  

Temporary fix

Comments

• Published On: 12/16/14
  

APAR Information

• APAR is sysrouted FROM one or more of the following:

• APAR is sysrouted TO one or more of the following:

Fix information

• Fixed component name

  STR B2B INTEGRA

• Fixed component ID

  5725D0600

Applicable component levels

• R510 PSY

     UP