Re: [myrinet] RE: Re: Re: mpich PBS etc. and gm_ports not closing

Yes, there is signal handling in the mpirun script. But it's not
completely reliable. SIGINT is transmitted through the rsh to the remote
processes, no other signals are transmitted. Look at the BUGS section of
the rsh man page. There needs to be more intelligent signal handling at
the MPICH layer, there are many reasons why not rely on the shell script
and rsh. The original problem was C-c not killing all the MPI processes
the way a user would expect, but like I said, I wouldn't completely trust
the perl script to handle all things that users could come up with.

Doug


For
example, for whatever reason a node that
is running an mpi process is shutdown. When linux is shutting down it will
first try to send a TERM signal, then sleeps and then a kill signal to
clean up any processes that are left. The MPI process on that node needs
to catch the TERM signal and call MPI_Abort.

On Wed, 20 Sep 2000, Greg Lindahl wrote:

> > Here's a patch that catches the C-c and calls MPID_Abort.
> 
> I don't understand. Normally mpirun (perl script) receives the ^C from a
> user. Does the standard one not have a signal handler?
> 
> -- g
> 

-- 
Doug Johnson
Systems Developer/Engineer
The Ohio Supercomputer Center
[email protected]