[petsc-users] mumps freezes for bigger problems

[Dominik Szczerba]

I am successfully solving my indefinite systems with MUMPS but only
for very small problems. To give a feeling, a mere couple thousands
elements. If I only double the problem size, it silently freezes, even
with max verbosity via the control parameters. Did anyone succeed here
with big problems? Any recommendations for a drop-in replacement for
MUMPS?

Thanks for any hints,
Dominik



Options used:
-mat_mumps_icntl_4 3 -mat_mumps_icntl_28 2 -mat_mumps_icntl_29

Output:

****** FACTORIZATION STEP ********


 GLOBAL STATISTICS PRIOR NUMERICAL FACTORIZATION ...
 NUMBER OF WORKING PROCESSES              =          16
 OUT-OF-CORE OPTION (ICNTL(22))           =           0
 REAL SPACE FOR FACTORS                   =  1438970073
 INTEGER SPACE FOR FACTORS                =    11376442
 MAXIMUM FRONTAL SIZE (ESTIMATED)         =       16868
 NUMBER OF NODES IN THE TREE              =       43676
 Convergence error after scaling for ONE-NORM (option 7/8)   = 0.21D+01
 Maximum effective relaxed size of S              =   231932340
 Average effective relaxed size of S              =   182366303

 REDISTRIB: TOTAL DATA LOCAL/SENT         =     1509215    22859750
 GLOBAL TIME FOR MATRIX DISTRIBUTION       =      0.8270
 ** Memory relaxation parameter ( ICNTL(14)  )            :        35
 ** Rank of processor needing largest memory in facto     :         0
 ** Space in MBYTES used by this processor for facto      :      2017
 ** Avg. Space in MBYTES per working proc during facto    :      1618