[Trilinos-Users] linking on Windows

[Heroux, Michael A]

Chris,

Clapack already has the Blas, so you don't need them separately.

I have not seen a performance comparison, but I would be surprised if there was a big difference between the two.

Clapack can use another Blas library. You will eventually want a fast Blas library if:

- you are a heavy GMRES user, since DGEMV is important in this case and the optimized versions are much faster.

- you use block Krylov methods in Belos or Anasazi., which rely on level 3 Blas.

- if you are using Intrepid or Pliris, which rely on DGEMM.

Otherwise, use of the Clapack Blas doesn't have a huge impact on performance.

Mike

________________________________
From: trilinos-users-bounces at software.sandia.gov <trilinos-users-bounces at software.sandia.gov>
To: 'trilinos-users at software.sandia.gov' <trilinos-users at software.sandia.gov>
Sent: Mon Oct 19 15:07:49 2009
Subject: [Trilinos-Users] linking on Windows

OK, I successfully built the libraries I need in 10.0.0 using MSVS.  That went really smoothly.  Now I am trying to link to my application and I’m getting name resolution errors to the LAPACK library functions.  Before I tackle that I have a question…

In the process of getting started I generated BOTH a LAPACK/BLAS library compiled with Intel Fortran, AND the “CLAPACK” library as detailed in cmake/README.windows.  Is the former useless to me?  Should I only try to link to the CLAPACK library?

And, a question about this… has anyone compared the performance of CLAPACK with that of the Fortran versions?

Thanks

Chris Jackson
MAYA Heat Transfer Technologies



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