[mpiwg-tools] Intel MPI Backend Breakpoint

[Jeff Squyres (jsquyres)]

FWIW, we just decided this week in Open MPI to deprecate the MPIR interface in favor of PMIx.


> On Jul 12, 2017, at 2:02 PM, Durnov, Dmitry <dmitry.durnov at intel.com> wrote:
> 
> Sure.
> 
> Thanks.
> 
> BR,
> Dmitry
> 
> -----Original Message-----
> From: mpiwg-tools [mailto:mpiwg-tools-bounces at lists.mpi-forum.org] On Behalf Of John DelSignore
> Sent: Wednesday, July 12, 2017 9:52 PM
> To: mpiwg-tools at lists.mpi-forum.org
> Subject: Re: [mpiwg-tools] Intel MPI Backend Breakpoint
> 
> I'd be interested in being included in that discussion. FWIW, I work on the TotalView debugger and wrote-up the MPIR specification.
> 
> Cheers, John D.
> 
> -----Original Message-----
> From: mpiwg-tools [mailto:mpiwg-tools-bounces at lists.mpi-forum.org] On Behalf Of Durnov, Dmitry
> Sent: Wednesday, July 12, 2017 2:44 PM
> To: mpiwg-tools at lists.mpi-forum.org
> Subject: Re: [mpiwg-tools] Intel MPI Backend Breakpoint
> 
> Hi Alex,
> 
> I've started a separate mail thread where we may discuss details.
> 
> Thanks.
> 
> BR,
> Dmitry
> 
> -----Original Message-----
> From: mpiwg-tools [mailto:mpiwg-tools-bounces at lists.mpi-forum.org] On Behalf Of Alexander Zahdeh
> Sent: Wednesday, July 12, 2017 7:27 PM
> To: mpiwg-tools at lists.mpi-forum.org
> Subject: [mpiwg-tools] Intel MPI Backend Breakpoint
> 
> Hi,
> 
> This is Alex Zahdeh, one of the debugger tools developers at Cray. I had a question about how Intel MPI handles synchronization according to the MPIR debugging standard. The usual procedure for our debugger is to launch tool daemons to attach to the backend application processes while the application launcher is held at MPIR_Breakpoint. At this point the application process must be in some sort of barrier so the debugger tries to return the user to their own code by setting breakpoints at various initialization symbols for different parallel models, continuing, hitting one of the breakpoints, deleting the rest and finishing the current function. This works if the application is held before the breakpoints we set which does not seem to be the case with Intel MPI. Is there a more standard approach to returning the user to their own code or does it vary by programming model and implementor? And specifically with Intel MPI would there be a good breakpoint to set in this scenario?
> 
> Thanks much,
> Alex
> --
> Alex Zahdeh | PE Debugger Development | Cray Inc.
> azahdeh at cray.com | Office: 651-967-9628 | Cell: 651-300-2005 _______________________________________________
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-- 
Jeff Squyres
jsquyres at cisco.com