Hello, I use PETSs with MUMPS and looking carefully at the -ksp_view -ksp_monitor results I see:
KSP Object:(fwd_) 64 MPI processes type: preonly maximum iterations=10000, initial guess is zero tolerances: relative=1e-05, absolute=1e-50, divergence=10000 left preconditioning using NONE norm type for convergence test PC Object:(fwd_) 64 MPI processes type: cholesky Cholesky: out-of-place factorization tolerance for zero pivot 2.22045e-14 matrix ordering: natural factor fill ratio given 0, needed 0 Factored matrix follows: Matrix Object: 64 MPI processes type: mpiaij rows=1048944, cols=1048944 package used to perform factorization: mumps total: nonzeros=1266866685, allocated nonzeros=1266866685 total number of mallocs used during MatSetValues calls =0 MUMPS run parameters: SYM (matrix type): 1 PAR (host participation): 1 ICNTL(1) (output for error): 6 ICNTL(2) (output of diagnostic msg): 0 ICNTL(3) (output for global info): 0 ICNTL(4) (level of printing): 0 ICNTL(5) (input mat struct): 0 ICNTL(6) (matrix prescaling): 0 ICNTL(7) (sequentia matrix ordering):5 ICNTL(8) (scalling strategy): 77 ICNTL(10) (max num of refinements): 0 ICNTL(11) (error analysis): 0 ICNTL(12) (efficiency control): 1 ICNTL(13) (efficiency control): 0 ICNTL(14) (percentage of estimated workspace increase): 30 ICNTL(18) (input mat struct): 3 ICNTL(19) (Shur complement info): 0 ICNTL(20) (rhs sparse pattern): 0 ICNTL(21) (solution struct): 1 ICNTL(22) (in-core/out-of-core facility): 0 ICNTL(23) (max size of memory can be allocated locally):0 ICNTL(24) (detection of null pivot rows): 0 ICNTL(25) (computation of a null space basis): 0 ICNTL(26) (Schur options for rhs or solution): 0 ICNTL(27) (experimental parameter): -8 ICNTL(28) (use parallel or sequential ordering): 2 ICNTL(29) (parallel ordering): 0 ICNTL(30) (user-specified set of entries in inv(A)): 0 ICNTL(31) (factors is discarded in the solve phase): 0 ICNTL(33) (compute determinant): 0 ... linear system matrix = precond matrix: Matrix Object: 64 MPI processes type: mpiaij rows=1048944, cols=1048944 * total: nonzeros=7251312, allocated nonzeros=11554449 total number of mallocs used during MatSetValues calls =1071* not using I-node (on process 0) routines The particularly interesting part are last 3 lines. Where do these mallocs come from? Is it possible to reduce this number? Regards, Alexander -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.mcs.anl.gov/pipermail/petsc-dev/attachments/20111212/2a1ead78/attachment.html>