[Dune] [#1035] Parallel AMG in non-overlapping ISTLBackend ISTLBackend_NOVLP_CG_AMG_SSOR crashes (Attachment added)

[Dune]

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User who did this - Eike Mueller (Eike) 

Attached to Project - Dune
Summary - Parallel AMG in non-overlapping ISTLBackend ISTLBackend_NOVLP_CG_AMG_SSOR crashes
Task Type - Bug Report
Category - Solver
Status - New
Assigned To - 
Operating System - Linux
Severity - Low
Priority - Normal
Reported Version - SVN (pre2.2)
Due in Version - Undecided
Due Date - Undecided
Details - The parallel AMG preconditioner crashes with following error message for the attached test code, which solves a Poisson problem in a cube (with YaspGrid) or on a spherical shell (implemented with ALUGrid) (see source dune_alugridnovlpamg.cc):

Dune reported error: MathError [mgc:/u/n/em459/Library/Dune_trunk_30Jan2012/include/dune/istl/paamg/amg.hh:670]: Coarse solver did not converge
mpirun: killing job...

This happened both for the YaspGrid and the ALUGrid implementation when run on 8 processors. For YaspGrid it also crashes on two or four processes, but runs fine on just one process. However, on very rare occasions the 8 core run on YaspGrid did complete.

For YaspGrid, the code works if I increase the number of grid points in each direction from 16 to 32.

Use Dune revisions (trunk):
dune-common: r6559
dune-grid: r7861
dune-geometry: r38
dune-pdelab: r1705
dune-istl: r1522
dune-localfunctions: r1037

I also attach the config.log file from the configure of the test code and a full output log from an 8 core run with YaspGrid (run.log).
The compiler I used is g++44 (GCC) 4.4.4 20100726 (Red Hat 4.4.4-13).


One or more files have been attached.

More information can be found at the following URL:
http://www.dune-project.org/flyspray/index.php?do=details&task_id=1035

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