[petsc-users] SuperLU_dist bug with parallel symbolic factorisation

[Eric Chamberland]

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
> 
>