Hi Satish, I've installed superlu. I issued the command ./a.out -mat_type superlu -ksp_type preonly -pc_type lu and it just hanged there. Is it because I had install it with mpich? I also wanted to try umfpack and plapack. Is it similar?
Btw, plapack 's option isn't in pg 82 of the manual. Thank you. On 2/12/07, Satish Balay <balay at mcs.anl.gov> wrote: > > On Mon, 12 Feb 2007, Ben Tay wrote: > > > Hi, > > > > I'm trying to experiment with using external solvers. I have some > questions: > > > > 1. Is there any difference in speed with calling the external software > from > > PETSc or directly using them? > > There is minor conversion overhead when you use them from PETSc. > > > > > 2. I tried to install MUMPS using --download-mumps. I was prompted to > > include --with-scalapack. After changing, I was again prompted to > include > > --with-blacs. I changed and again I was told the need for > > --with-blacs-dir=<directory>. I thought I'm supposed to specify where to > > install blacs and entered a directory. But it seems that I need to > specify > > the location of where blacs is. But I do not have it. So how do I solve > > that? > > Mumps requires blacs & scalapack. So use: > --download-blacs=1 --download-scalapack=1 --download-mumps=1 > > > > > 3. I installed some other external packages. I wanted to test their > speed at > > solving equations. In the manual, I was told to use the runtime option > > -mat_type <mattype> -ksp_type preonly -pc_type <pctype> and also -help > to > > get help msg. However when I tried to issue ./a.out -mat_type superlu > > -ksp_type preonly -pc_type lu, nothing happened. How should the command > be > > issued? I tried to get help by running ./a.out -h what appears isn't > what I > > want. > > Did you install PETSc with superlu_dist? If so use '-mat_type > superlu_dist' > > [Note: superlu & superlu_dist are different packages - the first one > is sequential - the second one is parallel] > > Satish > > > > > Thank you very much. Regards. > > > > -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.mcs.anl.gov/pipermail/petsc-users/attachments/20070212/0eaad54a/attachment.htm>
