dolfin team mailing list archive

["Matthew Knepley" <knepley@xxxxxxxxx>]

On Sun, Oct 26, 2008 at 8:13 AM, Evan Lezar <evanlezar@xxxxxxxxx> wrote:
>
>
> On Sun, Oct 26, 2008 at 2:41 PM, Garth N. Wells <gnw20@xxxxxxxxx> wrote:
>>
>> Whether or not something is being run in parallel should be determined by
>> the number of processes,
>>
>>  uint dolfin::MPI::num_processes()
>>
>> Garth
>
> Yes, I am aware of that, but I want to have a bit more control over the
> parallelisation.  What I want is a number of processes each solving an
> independent eigenvalue system (actually I am doing a sweep in frequency for
> an electromagnetic problem and each frequency point has its own
> eigensystem).

There is aleady an elegant mechanism for controlling this,  namely the
communicator.
Every PETSc object has a communicator, thus determining how many processes
participate. Why make up another, less powerful mechanism?

   Matt

> I did send an earlier mail discussing this.
>
> Any help with swig would be much appreciated.
>
> Evan
>
>>
>> Evan Lezar wrote:
>>>
>>> Hi
>>>
>>> I have added a constructor to PETScMatrix to allow me to control whether
>>> the matrix is to be created in parallel or not.  The declarations are given
>>> below
>>>
>>> /// Create empty matrix
>>> explicit PETScMatrix(Type type=default_matrix);
>>>
>>> /// Create an empty matrix explicitly setting the parallel flag
>>> explicit PETScMatrix(bool is_parallel, Type type=default_matrix);
>>>
>>> The idea is that I use
>>>
>>> S = PETScMatrix(False)
>>> If I want to create a matrix that is local.  The problem is that swig
>>> can't differentiate between Type and bool (and uint for the PETScMatrix(uint
>>> M, uint N, Type type=default_matrix); constructor).  I have seen that it is
>>> possible to rename PETScMatrix(bool) to PETScMatrix_bool(bool) for example
>>> so that the python call would be
>>>
>>> S = PETScMatrix_bool(False),
>>>
>>> but I can't seem to get this working.  Any suggestions?
>>>
>>> Thanks
>>> Evan
>>>
>>>
>>> ------------------------------------------------------------------------
>>>
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>>
>
>
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-- 
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