[petsc-users] parallel computing error

[­권승리 / 학생 / 항공우주공학과]

Dear developers

I'm trying to use parallel computing and I ran the command 'mpirun -np 4
./app'

In this case, there are two problems.

*First,* I encountered error message
///
[0]PETSC ERROR: [1]PETSC ERROR: --------------------- Error Message
--------------------------------------------------------------
[1]PETSC ERROR: Invalid argument
[1]PETSC ERROR: Comm must be of size 1
///
The code on the error position is
MatCreateSeqDense(PETSC_COMM_SELF, nns, ns, NULL, &Kns));
Could "MatCreateSeqDense" not be used in parallel computing?

*Second*, the same error message is repeated as many times as the number of
cores.
if I use command -np 4, then the error message is repeated 4 times.
Could you recommend some advice related to this?

Best,
Seung Lee Kwon

-- 
Seung Lee Kwon, Ph.D.Candidate
Aerospace Structures and Materials Laboratory
Department of Mechanical and Aerospace Engineering
Seoul National University
Building 300 Rm 503, Gwanak-ro 1, Gwanak-gu, Seoul, South Korea, 08826
E-mail : ksl7912 at snu.ac.kr
Office : +82-2-880-7389
C. P : +82-10-4695-1062
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