[petsc-users] SuperLU_dist bug with parallel symbolic factorisation

[Xiaoye S. Li]

Is it possible to download this particular matrix, so I can do standalone
investigation?

Sherry

On Tue, May 22, 2018 at 12:22 PM, Eric Chamberland <
Eric.Chamberland at giref.ulaval.ca> wrote:

> Hi Fande,
>
> I don't know, I am working and validating with a DEBUG version of PETSc,
> and this "mwe" is a 30x30 matrix...
>
> But I "hope" the parallel version is faster for large problems... if it is
> not maybe it should be somewhat reviewed...
>
> Eric
>
>
> On 22/05/18 02:22 PM, Fande Kong wrote:
>
>> Hi Eric,
>>
>> I am curious if the parallel symbolic factoriation is faster than the
>> sequential version? Do you have timing?
>>
>>
>> Fande,
>>
>> On Tue, May 22, 2018 at 12:18 PM, Eric Chamberland <
>> Eric.Chamberland at giref.ulaval.ca <mailto:Eric.Chamberland at giref.ulaval.ca>>
>> wrote:
>>
>>
>>
>>     On 22/05/18 02:03 PM, Smith, Barry F. wrote:
>>
>>
>>              Hmm, why would
>>
>>             the resolution with *sequential* symbolic factorisation
>>             gives ans err around 1e-6 instead of 1e-16 for parallel one
>>             (when it works).
>>
>>
>>             ? One would think that doing a "sequential" symbolic
>>         factorization won't affect the answer to this huge amount?
>>         Perhaps this is the problem that needs to be addressed.
>>
>>
>>     I do agree that this is a huge amount of difference... and if we
>>     agree this is also a bug, than it means there are not one but two
>>     bugs that deserve to be fixed...
>>
>>     Thanks,
>>
>>     Eric
>>
>>
>>
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