Hi All,

Some time we are unable to a genarate Heap and core dumps using following commands kill -3 , wasadmin, jython commands ,but in the Nehative str_err.log file it showing the java , Heap dumps are genrtated in the some XXXX location , but i can't see those files in that location.Kindly let me know due to what cause those dumps not genrating .

Thanks
Satheesh


 

Hi Satheesh,

  You are not saying what version of java are using.
 
  Try launching the next java option to get dump options.
 
  WAS_HOME\java\bin\java -Xdump:what
 
  Hope this helps. Tell us if you need more support
 
regards

Hi Gabriel,

Java version JRE 1.6.0
Registered dump agents
----------------------
-Xdump:heap:
events=systhrow,
filter=java/lang/OutOfMemoryError,
label=xxx/heapdump.%Y%m%d.%H%M%S.%pid.%seq.phd,
range=1..4,
priority=500,
request=exclusive+compact+prepwalk,
opts=PHD
----------------------
-Xdump:java:
events=gpf+user+abort+traceassert,
label=xxxx/javacore.%Y%m%d.%H%M%S.%pid.%seq.txt,
range=1..0,
priority=400,
request=exclusive+preempt
----------------------
-Xdump:java:
events=systhrow,
filter=java/lang/OutOfMemoryError,
label=xxxx/javacore.%Y%m%d.%H%M%S.%pid.%seq.txt,
range=1..4,
priority=400,
request=exclusive+preempt

As per GC log file its say the java/Heap dumps are genrated "xxx/pxx/"location but in that location we can't see those files.I have observed one thing these two locations (" in the Xdump:label=xxxx/javacore.%Y%m%d.%H%M%S.%pid.%seq.txt, in the GClog Java/heap Dump locatin :xxx/pxx/Javacore ..)" are not same. 

Here the issue  is the dumps are deleting automatincally (there is no cron job set for deleting dupms as well) .. 

Can we set N number of genrate java core /Heap dumps in the websphere7? if yes could you please let me know where we can set that value.

As per my knowladge By defalut we can genrate "10"java core/Heap dumps ,if am wrong can you please coorect me. 

satheesh,

  Yes you can limit the number of dumps dynamically (JVM is started), and yes by default are 10.
 
   Limit the number of Heapdumps and System Dumps using wsadmin
   www-01.ibm.com/support/docview.wss?uid=s...
   
  Or using -Xdump range option

  publib.boulder.ibm.com/infocenter/javasd...
   
  I suggest to review if you have some of the next environment variables:

   In the Process Definition > Environment section:
     IBM_HEAPDUMP=true
     IBM_HEAPDUMPDIR=/path/to/dir
     IBM_JAVACORE=true
     IBM_JAVACOREDIR=/path/to/dir
     JAVA_DUMP_OPTS=ONANYSIGNAL(JAVADUMP[5],HEAPDUMP[5])
 
    or in the JVM generic arguments:
 
      -Xdump:java+heap+system:events=systhrow,filter=java/lang/OutOfMemoryError,request=exclusive+prepwalk

      
  From Java 6 SR 2, the dump settings are applied in the following order, with the settings later in the list taking precedence:

• Default JVM dump behavior.


• -Xdump command-line options that specify -Xdump::defaults, see defaults option.


• DISABLE_JAVADUMP, IBM_HEAPDUMP, and IBM_HEAP_DUMP environment variables.


• IBM_JAVADUMP_OUTOFMEMORY and IBM_HEAPDUMP_OUTOFMEMORY environment variables.


• JAVA_DUMP_OPTS environment variable.


• Remaining -Xdump command-line options.

            
  Hope this helps. Tell us if you need more support
 
regards