[omniORB] Server hangs

[Mike Olson]

Duncan Grisby wrote:
> 
> On Wednesday 29 November, Richard Bouska wrote:

Duncan,

  Thanks for the quick turn around.  It seems to have fixed the
concurrency problem, kinda.  The server now runs _much_ longer, however
eventually, one of the connections returns a COMM_FAILURE exception. 
The interesting thing is when this happens, all connections receive the
COMM_FAILURE (minor 11).  The server is then unresponsive to connections
for some perios of time (2-3 seconds), then it will start returning
objects and everything is fine.  Granted, the times depend on your
machine.

  Any thoughts?

Mike


> 
> > I noticed the same behaviour - I have downgraded the version of omniORBpy
> > from 1.2 to 1.0, the omniORB I let 3.0.2. I have also python 1.5.2. on
> > Debian GNU/Linux.
> 
> The bug is now fixed in CVS and the bugfixes patch. It will appear in
> tonight's snapshot too. The problem was a deadlock between the Python
> interpreter lock and an internal lock in omniORB. The fix is to be
> more careful about unlocking the Python lock before calling into
> certain ORB functions.
> 
> > My server also hanged and after several minutes disappeared from process
> > list. Also I noticed that the newer (buggy) version of omniORBpy is much
> > slower in the multithread operation than the 1.0.
> 
> I'm surprised that you see 1.2 being slower than 1.0. Nothing has
> changed which should affect performance in any significant way, and I
> haven't seen any change. What are you doing which is much slower in
> 1.2 than in 1.0?
> 
> I don't recommend using 1.0, since there are quite a few bugs which
> have been fixed since then.
> 
> Cheers,
> 
> Duncan.
> 
> --
>  -- Duncan Grisby  \  Research Engineer  --
>   -- AT&T Laboratories Cambridge          --
>    -- http://www.uk.research.att.com/~dpg1 --

-- 
Mike Olson				 Principal Consultant
mike.olson@fourthought.com               (303)583-9900 x 102
Fourthought, Inc.                         http://Fourthought.com 
Software-engineering, knowledge-management, XML, CORBA, Linux, Python