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Questions tagged [scalapack]

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8
votes
1answer
69 views

Benchmark problems for eigenvalue reordering algorithms sought

Every real matrix $A$ can be reduce to real Schur form $T = U^T A U$ using an orthogonal similiary transform $U$. Here the matrix $T$ is quasi-triangular form with 1 by 1 or 2 by 2 blocks on the main ...
0
votes
0answers
84 views

Output of SCALAPACK pdgetrf as input for LAPACK dgesv

I try to use the output of the SCALAPACK routine pdgetrf (LU factorization) as input for the LAPACK routine dgesv. In the first ...
1
vote
0answers
65 views

Kronecker product of matrices

I have to use Kronecker product of a matrix with a unit matrix is there any routine in ScaLapack or Lapack which can do so efficiently.
0
votes
0answers
41 views

Alternatives for ScaLAPACK pdgesv_ to reduce solving time [duplicate]

I call ScaLAPACK pdgesv_ inside of my FE code. Now, I have to solve matrices of size more than $20000 \times 20000$ and pdgesv_ ...
1
vote
0answers
99 views

Computing only the $k$ biggest eigenvalues and eigenvectors with Scalapack

Given that there are eigensolvers in Scalapack that use a divide and conquer method, is there any way we can use Scalapack functions to only compute the first $k$ dominant eigenvalues and ...
1
vote
1answer
167 views

Total Flop count for LAPACK DPOSV

I am looking at the LAPACK DPOSV routine that computes the solution to the real system of linear equations A * X = B. The routine description can be found here: http://www.math.utah.edu/software/...
4
votes
0answers
145 views

BLACS context value and multiple MPI communicators [closed]

I am reposting here a question previously asked in stackoverflow: as suggested in a reply to my question, scicomp could be a better place to obtain some useful comments/suggestions for my problem. I ...
4
votes
2answers
272 views

How gracefully does scalapack/pblas revert to lapack/blas in serial

If I use scalapack and pblas, and the code is run in serial (1x1 blacs process grid), how well does scalapack and pblas revert to the performance of lapack/blas? I am particularly interested in the ...
2
votes
1answer
130 views

*GEMR2D documentation (scalapack)

Where can I find documentation for the P*GEMR2D routines in Fortran? I've found: Scalapack UG Undocumented related source Unanswered forum post