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MPI issues with my own solver

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Old   March 22, 2012, 11:54
Question MPI issues with my own solver
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Davide Cagnoni
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Hi everybody!

I'm not sure if this can be just a running problem, a programming problem or a bug, so I will write here hoping it's ok.

I programmed my own solver ( for joint fluid dynamics and electrical problems ) which is working really fine on serial runs (with around 10^5 mesh cells) but as i now want to use it for a non 2D case, my mesh comes up to 1.5kk cells and I switched to parallel.

I tested before with the breakingDam classic example, which works fine, then i switched to my own stuff

I decomposePar'd the domain - all fine - and then i ran the solver obtaining the following message:

Code:
[moon01-01:19649] *** An error occurred in MPI_Recv
[moon01-01:19649] *** on communicator MPI_COMM_WORLD
[moon01-01:19649] *** MPI_ERR_TRUNCATE: message truncated
[moon01-01:19649] *** MPI_ERRORS_ARE_FATAL (your MPI job will now abort)
                --------------------------------------------------------------------------
mpirun has exited due to process rank 0 with PID 19649 on
node moon01-01 exiting without calling "finalize". This may
have caused other processes in the application to be
terminated by signals sent by mpirun (as reported here).
--------------------------------------------------------------------------
the strange fact is that this error comes up every time at the exact same stage in the solving: I have a newton iteration stage for a nonlinear problem, and this comes up always after the 15th iteration, before the 16th linear solving of the problem.

does anyone have a hint about what's going on?
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Old   March 23, 2012, 10:57
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Davide Cagnoni
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after further tries, i came to the conclusion that this is 99% probably something programming-related so I posted another thread in the correct section... feel free to have a look there
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