[petsc-dev] building with MKL

[Matthew Knepley]

On Sun, Jul 1, 2018 at 9:49 PM Jeff Hammond <jeff.science at gmail.com> wrote:

> On Sun, Jul 1, 2018 at 10:43 AM Victor Eijkhout <eijkhout at tacc.utexas.edu>
> wrote:
>
>>
>>
>> On Jul 1, 2018, at 12:30 PM, Jeff Hammond <jeff.science at gmail.com> wrote:
>>
>> If you really want to do this, then replace COMMON with CORE to
>> specialize for SKX. There’s not point to using COMMON if you’ve got the MIC
>> path already.
>>
>>
>> We advocate CORE on our userguides, but the Intel compiler crashes
>> reliably with that in certain cases. I think in particular Intel has never
>> figured out how complex numbers work.
>>
>
> Is PETSc using C99 _Complex or C++ std::complex?
>

It can be configured to use either.

  Matt


> I haven’t heard any complaints about how Intel compilers treat
> ISO-standard complex types. I’ll see what’s in the ticket system now.
>
> If the compiler crashes it’s always on the petsc complex mode. I think I
>> have submitted tickets about that, so maybe it’s fixed in update 3.
>>
>
> Version 17 I assume?
>
>
>> I have also seen cases where CORE gives numerical problems and replacing
>> by COMMON fixed them. Sorry, that was a user ticket and having solved it I
>> didn’t bother to submit an Intel support ticket.
>>
>
> AVX-512DQ shouldn’t change numerical results so this is an indirect effect
> and worthy of creating a compiler bug report if you can isolate the issue.
>
>
>> The support website is a nightmare anyway, so I’m not overly motivated to
>> submit support tickets in the first place.
>>
>
> I know that website sucks, but I have filed 50+ bug reports that way in
> the past 4+ years, because it is the single most effective way to get
> positive results.
>
> If you send me single-file preprocessed (Linux preferred, but Mac works)
> MCVEs, I’ll put them straight into the internal ticket system.
>
> Jeff
>
>> --
> Jeff Hammond
> jeff.science at gmail.com
> http://jeffhammond.github.io/
>


-- 
What most experimenters take for granted before they begin their
experiments is infinitely more interesting than any results to which their
experiments lead.
-- Norbert Wiener

https://www.cse.buffalo.edu/~knepley/ <http://www.caam.rice.edu/~mk51/>
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