Thanks - should I attached the debugger in debug mode or in optimized mode? I suspect it will be tremendously slow in debug mode, otoh I am not sure if it will yield any useful information in optimized mode.
Also, will -on_error_attach_debugger do the trick? -Nachiket On Thu, Dec 13, 2012 at 4:29 PM, Matthew Knepley <knepley at gmail.com> wrote: > On Thu, Dec 13, 2012 at 1:20 PM, Nachiket Gokhale <gokhalen at gmail.com> > wrote: > > I am trying to solve a complex matrix equation which was assembled using > > MatCompositeMerge using MUMPS and LU preconditioner. It seems to me that > > the solve is stuck in the factorization phase. It is taking 20 mins or > so, > > using 16 processes. A problem of the same size using reals instead of > > complex was solved previously in approximately a minute using 4 > processes. > > Mumps output of -mat_mumps_icntl_4 1 at the end of this email. Does > anyone > > have any ideas about what the problem maybe ? > > Complex arithmetic is much more expensive, and you can lose some of > the optimizations > made in the code. I think you have to wait longer than this. Also, you > should try attaching > the debugger to a process to see whether it is computing or waiting. > > Matt > > > Thanks, > > > > -Nachiket > > > > > > > > Entering ZMUMPS driver with JOB, N, NZ = 1 122370 0 > > > > ZMUMPS 4.10.0 > > L U Solver for unsymmetric matrices > > Type of parallelism: Working host > > > > ****** ANALYSIS STEP ******** > > > > ** Max-trans not allowed because matrix is distributed > > ... Structural symmetry (in percent)= 100 > > Density: NBdense, Average, Median = 0 42 26 > > Ordering based on METIS > > A root of estimated size 2736 has been selected for Scalapack. > > > > Leaving analysis phase with ... > > INFOG(1) = 0 > > INFOG(2) = 0 > > -- (20) Number of entries in factors (estim.) = 563723522 > > -- (3) Storage of factors (REAL, estimated) = 565185337 > > -- (4) Storage of factors (INT , estimated) = 3537003 > > -- (5) Maximum frontal size (estimated) = 15239 > > -- (6) Number of nodes in the tree = 7914 > > -- (32) Type of analysis effectively used = 1 > > -- (7) Ordering option effectively used = 5 > > ICNTL(6) Maximum transversal option = 0 > > ICNTL(7) Pivot order option = 7 > > Percentage of memory relaxation (effective) = 35 > > Number of level 2 nodes = 35 > > Number of split nodes = 8 > > RINFOG(1) Operations during elimination (estim)= 4.877D+12 > > Distributed matrix entry format (ICNTL(18)) = 3 > > ** Rank of proc needing largest memory in IC facto : 0 > > ** Estimated corresponding MBYTES for IC facto : 3661 > > ** Estimated avg. MBYTES per work. proc at facto (IC) : 2018 > > ** TOTAL space in MBYTES for IC factorization : 32289 > > ** Rank of proc needing largest memory for OOC facto : 0 > > ** Estimated corresponding MBYTES for OOC facto : 3462 > > ** Estimated avg. MBYTES per work. proc at facto (OOC) : 1787 > > ** TOTAL space in MBYTES for OOC factorization : 28599 > > Entering ZMUMPS driver with JOB, N, NZ = 2 122370 5211070 > > > > ****** FACTORIZATION STEP ******** > > > > > > GLOBAL STATISTICS PRIOR NUMERICAL FACTORIZATION ... > > NUMBER OF WORKING PROCESSES = 16 > > OUT-OF-CORE OPTION (ICNTL(22)) = 0 > > REAL SPACE FOR FACTORS = 565185337 > > INTEGER SPACE FOR FACTORS = 3537003 > > MAXIMUM FRONTAL SIZE (ESTIMATED) = 15239 > > NUMBER OF NODES IN THE TREE = 7914 > > Convergence error after scaling for ONE-NORM (option 7/8) = 0.79D+00 > > Maximum effective relaxed size of S = 199523439 > > Average effective relaxed size of S = 98303057 > > > > REDISTRIB: TOTAL DATA LOCAL/SENT = 657185 14022665 > > GLOBAL TIME FOR MATRIX DISTRIBUTION = 0.4805 > > ** Memory relaxation parameter ( ICNTL(14) ) : 35 > > ** Rank of processor needing largest memory in facto : 0 > > ** Space in MBYTES used by this processor for facto : 3661 > > ** Avg. Space in MBYTES per working proc during facto : 2018 > > > > > > -- > 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/20121213/4acb2b04/attachment.html>
