Dear Dr.Bangerth,
I did nothing to verify those properties. because the single thread CG
solver converged well. I used different preconditioners in parallel
version and single thread version. In the parallel version I used block
Jacobi and in the single thread version I used Jacobi. How can I check if
the parallel blocked sparse matrix is/ isn't symmetrical and positive
definite?
Best regards,
Yuesu
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