yade-dev team mailing list archive

[Bruno Chareyre <bruno.chareyre@xxxxxxxxxxx>]

FYI, I managed to get DEM-PFV working and giving the same results
(checktest + a few private scripts) on ubuntu 10.04, 12.04, and 14.04.
I'm about to restore the DEM-PFV check-script.
This was by using (some are "contrib" packages): openblas-dev,
suitesparse-metis-dev, parmetis-dev.
It still has to be checked versus the libs of the "main" archive
(suitesparse-dev, metis-dev).

On 14.04, it's a little bit slower. I think it needs to tune and
recompile some of the libs to achieve good performances.

Bruno

On 26/11/13 14:51, Bruno Chareyre wrote:
> (to yade-dev)
>> That's true. We need to move metis-library to yade-dem.org/packages
>> and compile the next version of packages against it.
> I must say the behavior of cmake is not completely consistent at the
> moment. I will fix it eventually but I can already clarify a little.
> What we do is solving a matrix system, and depending on available libs
> this is what should happen:
> 1/ suitesparse+openblas+metis : this is the optimal situation,
> suitesparse will use metis for preconditionning and openblas for
> matrix/vector operations.
> 2/ suitesparse+openblas: functionality should be the same, just the
> preconditionning may be a bit less efficient
> 3/ suitesparse alone (i.e. with some "legacy" blas/lapack): again not
> fundamentally different but a bit less efficient
>
> All the above is direct solving (Cholesky factorization). The situation
> we have now for yadedaily/12.04 corresponds to:
> 4/ no suitesparse available, use iterative (Gauss-Seidel) algorithm
> implemented directly in yade's code for solving the system. Quite slow.
>
> The thing is we could very much build as in 2, then get acceptable
> performance without metis. It's just that the build system is going
> straight to 4) as soon as one lib is missing. Since we should try and
> stick to metis anyway, I don't see a high priority in fixing that.
>
> Bruno
>
>> Anton
>>
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>


-- 
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Bruno Chareyre
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ENSE³ - Grenoble INP
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