On Fri, Mar 4, 2011 at 4:40 PM, <ning.an at ghiocel-tech.com> wrote: > Hello There, > > I am new to PETSc and programming with FORTRAN. For the huge sparse > matrix (200,000x200,000 symmetric), it is so slow to set the matrix in > PETSc by reading them in matrix market format, which is far beyond our > patience. Therefore, I guess that it would be much fast to load the huge > matrix, if the matrix is in PETSc binary matrix format > directly. >
It is probably slow because you have not preallocated the matrix correctly: http://www.mcs.anl.gov/petsc/petsc-as/documentation/faq.html#efficient-assembly > Please help on how to write the symmetric matrix in PETSc binary matrix > format directly? > You just save it using MatView(). For example: http://www.mcs.anl.gov/petsc/petsc-as/snapshots/petsc-current/src/ksp/pc/examples/tutorials/ex2.c.html Matt > Both the guidance and examples are welcome. > > Ning -- 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/20110304/1863f703/attachment.htm>
