WLS6.1 hanging on Solaris- and SIGQUIT doesn't work
Hi,
We are experiencing a problem that looks like a deadlock when our server is under load (using WLS6.1SP2, Solaris 8 and the 1.3.1 JVM supplied with WLS). After processing many requests, the server hangs and CPU usage drops to 0%. Unfortunately the standard means of getting a thread dump (sending a SIGQUIT with kill -3 or Ctrl-\) does nothing. The problem also occurs if WebLogic is running under debug (using
-Xdebug -Xnoagent -Djava.compiler=none -Xrunjdwp:transport=dt_socket,server=y,suspend=n,address=5555) but alas the debugger hangs when trying to pause the server after this deadlock). It appears as though the server is not accepting any requests (including administrative requests from the console) but this doesn't seem to be due to thread starvation as CPU usage is 0%.
The only output we can get is from truss, which seems to indicate no activity at all until the SIGQUIT is received. It seems to register the SIGQUIT but it looks as though it is not being processed.
Does anyone have any ideas?
Kevin.
We found a solution to this problem, relating to the threading model that the JVM
uses.
Have a look at http://java.sun.com/docs/hotspot/threads/threads.html for more
details.
The default threading model on Solaris 8 is many-to-many (threads to LWPs) with
thread-based synchronisation. After playing with various threading models, we
found that the best was one-to-one with the alternate thread library. This is
the default provided by Solaris 9, but you can also tell Java to use this with
older versions of Solaris by putting the following line in your start command
prior to executing WebLogic:
export LD_LIBRARY_PATH=/usr/lib/lwp:$LD_LIBRARY_PATH
Apologies to anyone who was looking for an answer to this beforehand: I should
have replied to this newsgroup back in September!
Kevin Thomas
J2EE Consultant
LogicaCMG
Charlie Therit <[email protected]> wrote:
Kevin,
If you are not able to capture a JVM thread dump, then the next best
thing would be to capture several "/usr/proc/bin/pstack pid" C-level
thread dumps. This information may enable BEA Support to help suggest
potential work arounds. Depending upon the data in the pstack output,
you may also wish to open a support case with Sun.
Sincerely,
Charlie Therit
Developer Relations Engineer
BEA Support
Kevin Thomas wrote:
Hi,
We are experiencing a problem that looks like a deadlock when our serveris under load (using WLS6.1SP2, Solaris 8 and the 1.3.1 JVM supplied
with WLS). After processing many requests, the server hangs and CPU
usage drops to 0%. Unfortunately the standard means of getting a thread
dump (sending a SIGQUIT with kill -3 or Ctrl-\) does nothing. The problem
also occurs if WebLogic is running under debug (using
-Xdebug -Xnoagent -Djava.compiler=none -Xrunjdwp:transport=dt_socket,server=y,suspend=n,address=5555)but alas the debugger hangs when trying to pause the server after this
deadlock). It appears as though the server is not accepting any requests
(including administrative requests from the console) but this doesn't
seem to be due to thread starvation as CPU usage is 0%.
The only output we can get is from truss, which seems to indicate noactivity at all until the SIGQUIT is received. It seems to register
the SIGQUIT but it looks as though it is not being processed.
Does anyone have any ideas?
Kevin.
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