[petsc-dev] PETSc object management of MPI communicators

[Barry Smith]

   You overstate my thought processes. I actually started with the most naive approach possible and gradually refined it to the present form as roadblocks to the naiver approaches appeared. Satish also contributed to getting the code right a great deal.   Bill knew how to do it all along, of course, he just didn’t tell us the needed details.

   Barry


On Jan 9, 2014, at 4:56 PM, Jed Brown <jedbrown at mcs.anl.gov> wrote:

> Dmitry Karpeyev <karpeev at mcs.anl.gov> writes:
> 
>> I'd say that a writeup explaining why the inner comms are needed would be
>> useful also for others to understand the peculiarities/shortcomings of the
>> MPI model.  
> 
> I don't think this is a shortcoming; MPI attributes are perfectly
> sufficient for this purpose.  I think Bill had this use case in mind
> when arguing for attribute caching in MPI-1.
> 
>> You never know who might be contributing to the next successful
>> programming model, so don't we want more people to understand MPI?
> 
> Yes, that's why I suggested writing a short report explaining Barry and
> Bill's reasoning from 20 years ago.  A blog post would be an alternative
> medium.