dolfin team mailing list archive

["Dag Lindbo" <dag@xxxxxxxxxx>]

> Kent-Andre Mardal wrote:
>> BTW: the Assembler code that computes A, b and enforces BC
>> simultaneously in a symmetric way,
>
> Very nice. We can now implement some symmetric linear solvers.

I'm interested in a cholesky solver so I'll see what I can do with
CHOLMOD. It is part of the same suite as UMFPACK so it seems a sensible
choice.
/Dag

>
> Do you keep the 'Dirichlet' dofs and zero the row and column, or do you
> eliminate them from the global system?
>
> is now faster than the standard
>> non-symmetric way of doing it:
>>
>> timings:
>> new     : 1.55
>> standard: 1.94
>>
>
> Which backend is this using? It could be saying more about the
> efficiency of the function ident(..), which I suspect is slow for
> uBlasMatrix, than the assembly process.
>
> Garth
>
>> check demo/pde/sym-dirichlet-bc/speed-up-test.py
>>
>> Currently only cell integrals and exterior facet integrals are
>> implemented.
>>
>> Kent
>>
>> On on., 2008-08-13 at 11:46 +0200, DOLFIN wrote:
>>> One or more new changesets pushed to the primary dolfin repository.
>>> A short summary of the last three changesets is included below.
>>>
>>> changeset:   4563:3fbd8bd0822d1f363521ccd29afc1f694205ecc5
>>> tag:         tip
>>> parent:      4562:d912b2383bc98f98be1fa61e25cac3dec72df8fb
>>> parent:      4554:b3a0c04c85c2231e87bf187b35bcf6e2e27e8247
>>> user:        Kent-Andre Mardal <kent-and@xxxxxxxxx>
>>> date:        Wed Aug 13 11:41:52 2008 +0200
>>> files:       dolfin/fem/Assembler.cpp dolfin/fem/Assembler.h
>>> description:
>>> merge
>>>
>>>
>>> changeset:   4562:d912b2383bc98f98be1fa61e25cac3dec72df8fb
>>> user:        Kent-Andre Mardal <kent-and@xxxxxxxxx>
>>> date:        Wed Aug 13 11:41:23 2008 +0200
>>> files:       demo/pde/sym-dirichlet-bc/demo.py
>>> demo/pde/sym-dirichlet-bc/speed-up-test.py
>>> description:
>>> update text
>>>
>>>
>>> changeset:   4561:4749e1c883b9e21767a2c1142541badb6461866c
>>> parent:      4560:5daf9606ed74d52cb52ccf4e2f3cf20ab7152277
>>> parent:      4549:463016a27aadf2d3994d2249b4059feaf264dd5d
>>> user:        Kent-Andre Mardal <kent-and@xxxxxxxxx>
>>> date:        Wed Aug 13 11:34:33 2008 +0200
>>> files:       dolfin/fem/Assembler.cpp dolfin/la/MTL4SparsityPattern.cpp
>>> dolfin/la/MTL4SparsityPattern.h dolfin/mesh/ALE.cpp dolfin/mesh/ALE.h
>>> dolfin/mesh/ALEType.h dolfin/swig/dolfin_headers.i
>>> description:
>>> merge
>>>
>>> ----------------------------------------------------------------------
>>> For more details, visit http://www.fenics.org/hg/dolfin
>>> _______________________________________________
>>> DOLFIN-dev mailing list
>>> DOLFIN-dev@xxxxxxxxxx
>>> http://www.fenics.org/mailman/listinfo/dolfin-dev
>>
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