<br><font size=2 face="sans-serif">Hi</font>
<br>
<br><font size=2 face="sans-serif">We encounter sporadic hangs of our omniORB
4.0.5 based servers. The servers operate in thread pool mode with 5 threads
under Red Hat Enterprise Linux 3 Update 3.</font>
<br>
<br><font size=2 face="sans-serif">In a torture test 40 clients connect
to the server in parallel. Each client performs a single method call on
the server (a simple "void ping()" method), exits and is started
again. In this scenario it takes from a few minutes to a few hours until
the server stops responding. It does not matter if the clients and the
server run on the same or on different machines.</font>
<br>
<br><font size=2 face="sans-serif">Here is a trace output at level 10 (Messages
starting with a '+' were added by me in order to better understand what
is going on):</font>
<br>
<br><font size=2 face="sans-serif">omniORB: (2) +omniAsyncInvoker::insert:
omniTask::AnyTime: pd_idle_threads</font>
<br><font size=2 face="sans-serif">omniORB: (6) throw giopStream::CommFailure
from giopStream.cc:831(0,NO,COMM_FAILURE_UnMarshalArguments)</font>
<br><font size=2 face="sans-serif">omniORB: (2) +omniAsyncInvoker::insert:
omniTask::AnyTime, omniTask*=0x9db8ea8, pd_idle_threads=0x9db87e0, pd_nthreads=5,
pd_maxthreads=5, pd_totalthreads=6</font>
<br><font size=2 face="sans-serif">omniORB: (2) +omniAsyncInvoker::insert:
omniTask::AnyTime: pd_idle_threads</font>
<br><font size=2 face="sans-serif">omniORB: (6) throw giopStream::CommFailure
from giopStream.cc:831(0,NO,COMM_FAILURE_UnMarshalArguments)</font>
<br><font size=2 face="sans-serif">omniORB: (2) +omniAsyncInvoker::insert:
omniTask::AnyTime, omniTask*=0x9db8af0, pd_idle_threads=0x9db87e0, pd_nthreads=5,
pd_maxthreads=5, pd_totalthreads=6</font>
<br><font size=2 face="sans-serif">omniORB: (2) +omniAsyncInvoker::insert:
omniTask::AnyTime: pd_idle_threads</font>
<br><font size=2 face="sans-serif">omniORB: (2) +omniAsyncInvoker::insert:
omniTask::AnyTime, omniTask*=0x9db8b18, pd_idle_threads=(nil), pd_nthreads=5,
pd_maxthreads=5, pd_totalthreads=6</font>
<br><font size=2 face="sans-serif">omniORB: (6) throw giopStream::CommFailure
from giopStream.cc:831(0,NO,COMM_FAILURE_UnMarshalArguments)</font>
<br><font size=2 face="sans-serif">omniORB: (2) +omniAsyncInvoker::insert:
omniTask::AnyTime: else</font>
<br><font size=2 face="sans-serif">omniORB: (3) throw giopStream::CommFailure
from giopStream.cc:831(0,NO,COMM_FAILURE_UnMarshalArguments)</font>
<br><font size=2 face="sans-serif">omniORB: (4) throw giopStream::CommFailure
from giopStream.cc:831(0,NO,COMM_FAILURE_UnMarshalArguments)</font>
<br><font size=2 face="sans-serif">omniORB: (3) AsyncInvoker: thread id
= 3 has exited. Total threads = 6</font>
<br><font size=2 face="sans-serif">omniORB: (4) AsyncInvoker: thread id
= 4 has exited. Total threads = 6</font>
<br><font size=2 face="sans-serif">omniORB: (6) AsyncInvoker: thread id
= 6 has exited. Total threads = 6</font>
<br><font size=2 face="sans-serif">omniORB: (5) AsyncInvoker: thread id
= 5 has exited. Total threads = 3</font>
<br>
<br><font size=2 face="sans-serif">At some point in time all worker threads
exit and although clients want to connect, no new worker threads are started.
The server produces 100% CPU load and all clients hang.</font>
<br>
<br><font size=2 face="sans-serif">So far I was not able to produce hangs
at trace levels higher than 10. The additional output seems to lower the
probability of the hangs.</font>
<br>
<br><font size=2 face="sans-serif">In</font>
<br><font size=2 face="sans-serif">http://www.omniorb-support.com/pipermail/omniorb-list/2004-November/026184.html</font>
<br><font size=2 face="sans-serif">Duncan provides a patch for a problem
that I would consider at least very similar to this one. I applied the
patch to omniORB 4.0.5 but the resulting server blocks without starting
a single worker thread.</font>
<br>
<br><font size=2 face="sans-serif">Any tips and hints are welcome.</font>
<br>
<br><font size=2 face="sans-serif">Best regards, Peter.</font>