On Wed, Nov 30, 2011 at 10:08 AM, Alexander Grayver <agrayver at gfz-potsdam.de > wrote:
> ** > On 30.11.2011 16:22, Matthew Knepley wrote: > > On Wed, Nov 30, 2011 at 9:10 AM, Alexander Grayver < > agrayver at gfz-potsdam.de> wrote: > >> I'm not sure that MAT(S)BAIJ is what I need. My matrix symmetric, but >> not block. >> Well, I solve vector equations and there are 2-3 blocks (depending on the >> problem dimension), but this blocks normaly have size of > 10^5. So which >> block size should I specify to be efficient? >> > > Just use 1. > > > And for d_nz/o_nz also 1? > No, preallocate for the nonzeros you enter, as normal. Matt > Matt > > >> Regards, >> Alexander >> >> On 30.11.2011 14:27, Alexander Grayver wrote: >> >> Thanks Matt! >> >> Regards, >> Alexander >> >> On 30.11.2011 14:16, Matthew Knepley wrote: >> >> On Wed, Nov 30, 2011 at 3:43 AM, Alexander Grayver < >> agrayver at gfz-potsdam.de> wrote: >> >>> Hello, >>> >>> I'm trying to use mumps through PETSc now with symmetric matrix and >>> cholesky factorization. >>> When I use it directly I fill up only upper part of the matrix and set >>> mumid%SYM = 2. Is that possible to follow same way with petsc? >>> Which options do I have to choose? >>> >> >> >> http://www.mcs.anl.gov/petsc/petsc-dev/docs/manualpages/Mat/MATSBAIJ.html >> >> Matt >> >> >>> Thanks in advance. >>> >>> Regards, >>> Alexander >>> >> >> >> >> -- >> What most experimenters take for granted before they begin their >> experiments is infinitely more interesting than any results to which their >> experiments lead. >> -- Norbert Wiener >> >> >> >> > > > -- > What most experimenters take for granted before they begin their > experiments is infinitely more interesting than any results to which their > experiments lead. > -- Norbert Wiener > > > -- What most experimenters take for granted before they begin their experiments is infinitely more interesting than any results to which their experiments lead. -- Norbert Wiener -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.mcs.anl.gov/pipermail/petsc-users/attachments/20111130/fb037022/attachment.htm>
