Btw, how is Trilinos/ML <http://software.sandia.gov/trilinos/> used and installed? Is the command to download also --download*-*Trilinos/ML<http://software.sandia.gov/trilinos/> ? waht about the command to use it?
Thank you. On 2/12/07, Ben Tay <zonexo at gmail.com> wrote: > > 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/20070213/6ff8fb8f/attachment.htm>