[petsc-users] -mat_superlu_lwork

[Gianluca Meneghello]

Hong,

thanks for your answer. I do not know if my problem request 64 bit support.

My understanding is that I can preallocate the working array for
superlu with the PETSc database options -mat_superlu_lwork. Following
PETSc manual, this has to be specified in bytes.

>From my point of view, the problem is that I cannot pass to PETSc an
integer greater than 2.147.483.647 (that is, LONG_MAX), thus I am
limited to allocating roughly 2 GB of memory. If my factored matrix is
bigger, I have to rely on the mallocs/copy.

Let me know if it is not clear yet.

Gianlu





On 3 July 2012 15:53, Hong Zhang <hzhang at mcs.anl.gov> wrote:
> Gianluca:
>
> Do you mean 64-bit support for superlu?
> I do not understand your request, thus forward your request to superlu
> developer.
>
> Hong
>
>> Dear all,
>>
>> I am trying to use superlu as solver for a large, sparse matrix, and I
>> would like to use -mat_superlu_lwork to speed up the computation. The
>> problem I encounter is that my lwork size I would need is greated than
>> the maximum value for an object of type long int and is not correctly
>> read by the code.
>>
>> Is there a workaround to that? Does using another solver (mumps
>> maybe?) solve this problem and, if so, which option should I use?
>>
>> Thanks in advance
>>
>> Gianluca
>>
>> --
>> "[Je pense que] l'homme est un monde qui vaut des fois les mondes et
>> que les plus ardentes ambitions sont celles qui ont eu l'orgueil de
>> l'Anonymat" -- Non omnibus, sed mihi et tibi
>> Amedeo Modigliani
>
>



-- 
"[Je pense que] l'homme est un monde qui vaut des fois les mondes et
que les plus ardentes ambitions sont celles qui ont eu l'orgueil de
l'Anonymat" -- Non omnibus, sed mihi et tibi
Amedeo Modigliani