[Beowulf] ("LAPACK/C++ wrappers)

Peter St. John peter.st.john at gmail.com
Mon Nov 22 10:35:10 PST 2010


Regarding
"...Maybe PETSc is an overkill for you, but if the problem is that simple,
why not use Fortran and regular LAPACK/PLAPACK?,,,"
I haven't written fortran since IV and 77 in the early 80's. The matrix
multiplication part is simple but the ambient application is squirrelly and
I"m more facile in C or C++. So I just want basic linear algebra library I
can link my C to, but maybe all y'all use Matlab for simple things.
Probably I should just do it with, say, Armadillo, and learn something
without spilling too much blood from fingertips.
Peter


On Mon, Nov 22, 2010 at 12:38 PM, Gus Correa <gus at ldeo.columbia.edu> wrote:

> Peter St. John wrote:
> > Gus,
> > In my case, I"m not concerned with PDEs but the "linear system solvers"
> > themselves,which PETSci gets from other packages?
> Hi Peter
>
> Yes, you can compile PETSC with support of a variety of linear algebra
> packages.  See their installation instructions and documentation.
> I think there is support for PLAPACK, please check their
> install and docs pages:
>
> http://www.mcs.anl.gov/petsc/petsc-2/documentation/installation.html
> http://www.mcs.anl.gov/petsc/petsc-2/documentation/index.html
>
> > So for example,
> > looking over their table at:
> >
> http://www.mcs.anl.gov/petsc/petsc-as/documentation/linearsolvertable.html
> >  I'd want the "dense" case and therefore PLAPACK, so now I know to
> > google PLAPACK.
> > I just want to solve a system of simultaneous linear equations within
> > the vernacular of C/C++.
>
> AFAIK, PETSc has C, Fortran, and C++ interfaces.
> If I remember right, you can choose between C++ or C when
> you compile it.
> You can choose between real (for most linear algebra )
> or complex (a must for FFTs, and FFTW support) scalars.
> You can also choose which
> linear algebra packages you will use (which you can compile separately,
> or let PETSc handle - it handles many of them),
> which BLAS/LAPACK to use (say, Goto BLAS,
> Intel MKL, AMD ACML, or let PETSc install its own version).
>
> I am not a PETSc user, but some people here used PETSc to solve inverse
> and  forward problems, problems with sparse and dense matrices, etc.
> As it often happens when science (not computer science)
> is the main goal, once the "it works" stage is reached,
> the code starts to be used to produce papers,
> more and more features are added,
> and it is never again improved for efficiency,
> never goes beyond the prototype phase in this regard.
>
> In terms of efficiency, the results didn't shine,
> in terms of science/results output they were very good.
> However, it may well be that the way the problem
> (not PETSc) was programmed led to the inefficient code.
>
> PETSc experts in the list:
> For the benefit of Peter, Ivan, and the list,
> would you kindly jump in and say something about PETSc
> efficiency and other features?
> Txs.
>
> Maybe PETSc is an overkill for you, but if the problem is
> that simple, why not use Fortran and regular LAPACK/PLAPACK?
>
> My two cents.
> Gus Correa
>
> > Thanks,
> > Peter
> >
> > On Mon, Nov 22, 2010 at 11:42 AM, Gus Correa <gus at ldeo.columbia.edu
> > <mailto:gus at ldeo.columbia.edu>> wrote:
> >
> >     Would PETSc be of use for you?
> >
> >      http://www.mcs.anl.gov/petsc/petsc-as/
> >
> >     Gus Correa
> >
> >     Ivan Marin wrote:
> >      > I'm interested also in the bindings for C++ and LAPACK/ScaLAPACK.
> I
> >      > did some tests in the past for simple stuff, and worked, but very
> >      > simple linear system solvers.
> >      >
> >      > Ivan Marin
> >      >
> >      > Civil Engineering Dept
> >      > University of Minnesota
> >      > 500 Pillsbury Dr. S.E.
> >      > Minneapolis, MN 55455
> >      >
> >      > Laboratório de Hidráulica Computacional - LHC
> >      > Departamento de Hidráulica e Saneamento - SHS
> >      > Escola de Engenharia de São Carlos - EESC
> >      > Universidade de São Paulo - USP
> >      >
> >      > http://albatroz.shs.eesc.usp.br
> >      > +55 16 3373 8270
> >      >
> >      >
> >      >
> >      > 2010/11/17 Peter St. John <peter.st.john at gmail.com
> >     <mailto:peter.st.john at gmail.com>>:
> >      >> I'm going to dabble a bit with writing some C/C++ with a linear
> >     algebra
> >      >> library. My fortran is rusty (although I did some work
> >     translating fortran
> >      >> to C in this millennium :-).
> >      >> The wiki suggests: LAPACK++, clapack, and Armadillo. Would this
> >     choice have
> >      >> any real bearing on compiling against MPI later?
> >      >> Just if anyone is happy with any combination (LAPACK++ and
> >     OpenMPI, say) I'd
> >      >> be glad to hear it.
> >      >>
> >      >> I just installed (k)ubuntu, which seems fine for my purposes so
> >     far. I do
> >      >> miss fvwm, and the default "single click to invoke an
> >     application" is
> >      >> totally nuts but I fixed it.
> >      >> Thanks,
> >      >> Peter
> >      >>
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