[petsc-dev] GAMG error with MKL

[Mark Adams]

On Mon, Jul 9, 2018 at 7:19 PM Jeff Hammond <jeff.science at gmail.com> wrote:

>
>
> On Mon, Jul 9, 2018 at 7:38 AM, Mark Adams <mfadams at lbl.gov> wrote:
>
>> I agree with Matt's comment and let me add (somewhat redundantly)
>>
>>
>>> This isn't how you'd write MPI, is it?  No, you'd figure out how to
>>> decompose your data properly to exploit locality and then implement an
>>> algorithm that minimizes communication and synchronization.  Do that with
>>> OpenMP.
>>>
>>
>> I have never seen a DOE app that does this correct, get you data model
>> figured out first, then implement.
>>
>
> Chris Kerr's weather code (GFDL Hiram) has a single OpenMP parallel
> region.  He was at the last NERSC workshop I attended.  You should talk to
> him.
>
>
He is the last person I need to talk to :) but I wish my fusion colleagues
had walked down the road and talked with him 10 years ago.
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