[petsc-users] MatCreateSeqDense ?

[Jose E. Roman]

Don't use "time" to measure performance; instead use -log_summary or PetscGetTime for the interesting part of the computation. In this case, computing the residuals will take a lot of time.
Jose



El 27/07/2011, a las 19:28, John Chludzinski escribió:

> $ time ./ex7.exe -f1 k.dat -f2 m.dat -eps_gen_hermitian -eps_type lapack -eps_smallest_real > x.out 2>&1
> 
> real 19m4.487s
> user 18m19.650s
> sys 0m1.762s
> 
> ---John
> 
> 
> On Wed, Jul 27, 2011 at 7:03 AM, Jose E. Roman <jroman at dsic.upv.es> wrote:
> Try running with -eps_gen_hermitian (since ex7 does not assume that the problem is symmetric).
> Jose
> 
> 
> 
> El 27/07/2011, a las 12:51, John Chludzinski escribió:
> 
> > I let the SLEPc code run for ~45 min. when it terminated with the same values I was getting using DSYGV in LAPACK.
> >
> > If I write code to directly call LAPACK (i.e., DSYGV), it uses ~3.93 min.  What's up with this?
> >
> > ---John
> >
> >
> > On Wed, Jul 27, 2011 at 5:29 AM, John Chludzinski <jchludzinski at gmail.com> wrote:
> > I'm trying to create a dense matrices from values I'm reading from (binary) files.  I tried the following code:
> >
> > Mat A;
> > int n = SIZE; //4002
> > double *K = (double *)calloc( sizeof(double), SIZE*SIZE );
> > ...
> > MatCreateSeqDense(PETSC_COMM_SELF, n, n, K, &A);
> > MatView(A,PETSC_VIEWER_BINARY_(PETSC_COMM_WORLD));
> > ierr = PetscFinalize();CHKERRQ(ierr);
> >
> > NOTE:*** I'm converting K to the FORTRAN column major from the C row major order before I call  MatCreateSeqDense(...).
> >
> > This appears to work but when I try to use the 2 matrices I thus created with SLEPc ex7 (generalized eigenvalue problem) it never terminates, using:
> >
> > ./ex7.exe -f1 k.dat -f2 m.dat -eps_type lapack -eps_smallest_real
> >
> > Am I creating the proper PETSc binary (canonical) format for my 2 matrices?
> >
> > ---John
> >
> >
> >
> 
>