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From: Jeff Squyres \(jsquyres\) (jsquyres_at_[hidden])
Date: 2006-06-01 19:37:53


The main reason that it doesn't work is because we didn't do any thing
to make it work. :-)

Specifically, mpirun is not intercepting SIGSTOP and passing it on to
the remote nodes. There is nothing in the design or architecture that
would prevent this, but we just don't do it [yet].
 

> -----Original Message-----
> From: devel-bounces_at_[hidden]
> [mailto:devel-bounces_at_[hidden]] On Behalf Of Pak Lui
> Sent: Thursday, June 01, 2006 5:02 PM
> To: devel_at_[hidden]
> Subject: [OMPI devel] SIGSTOP and SIGCONT on orted
>
> Hi,
>
> I have a question on signals. Normally when I do a SIGTERM
> (control-C)
> on mpirun, the signal seems to get handled in a way that it
> broadcasts
> to the orted and processes on the execution hosts. However,
> when I send
> a SIGSTOP to mpirun, mpirun seems to have stopped, but the
> processes of
> the user executable continue to run. I guess I could hook up the
> debugger to mpirun and orted to see why they are handled differently,
> but I guess I anxious to hear about it here.
>
> I am trying to see the behavior of SIGSTOP and SIGCONT for the
> suspension/resumption feature in N1GE. It'll try to use these
> signals to
> stop and continue both mpirun and orted (and its processes), but the
> signals (SIGSTOP and SIGCONT) don't seem to get propagated to
> the remote
> orted.
>
> I can see there are some issues for implementing this feature on N1GE
> because the 'qrsh' interface does not send the signal to orted on the
> remote node, but only to 'mpirun'. I am trying to see how to
> work around
> this.
>
> --
>
> Thanks,
>
> - Pak Lui
> pak.lui_at_[hidden]
>
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