Orphan IBM JVM process
- by Nicholas Key
Hi people,
I have this issue about orphan IBM JVM process being created in the process tree:
For example:
C:\Program Files\IBM\WebSphere\AppServer\bin>wsadmin -lang jython -f "C:\Hello.py"
Hello.py has the simple implementation:
import time
i = 0
while (1):
i = i + 1
print "Hello World " + str(i)
time.sleep(3.0)
My machine has such JVM information:
C:\Program Files\WebSphere\java\bin>java -verbose:sizes -version
-Xmca32K RAM class segment increment
-Xmco128K ROM class segment increment
-Xmns0K initial new space size
-Xmnx0K maximum new space size
-Xms4M initial memory size
-Xmos4M initial old space size
-Xmox1624995K maximum old space size
-Xmx1624995K memory maximum
-Xmr16K remembered set size
-Xlp4K large page size
available large page sizes: 4K 4M
-Xmso256K operating system thread stack size
-Xiss2K java thread stack initial size
-Xssi16K java thread stack increment
-Xss256K java thread stack maximum size
java version "1.6.0"
Java(TM) SE Runtime Environment (build pwi3260sr6ifix-20091015_01(SR6+152211+155930+156106))
IBM J9 VM (build 2.4, JRE 1.6.0 IBM J9 2.4 Windows Server 2003 x86-32 jvmwi3260sr6-20091001_43491 (JIT enabled, AOT enabled)
J9VM - 20091001_043491
JIT - r9_20090902_1330ifx1
GC - 20090817_AA)
JCL - 20091006_01
While the program is running, I tried to kill it and subsequently I found an orphan IBM JVM process in the process tree. Is there a way to fix this issue? Why is there an orphan process in the first place? Is there something wrong with my code?
I really don't believe that my simplistic code is wrongly implemented. Any suggestions?
