Negative eigenvals. when parallel solving
Negative eigenvals. when parallel solving
(OP)
Hello!
I have the following problem: Jobs that run nicely on a single machine produce massive negative eigenvalues and fail when submitted to a parallel environment involving multiple machines.
I am using a user material subroutine, that does not contain any MPI-related functions. I thought ABQ includes the corresponding code in the main prog. at compiling and linking time. I think the calc. wouldn't even start if this was missing.
Has someone experienced similar problems?
Greetings





RE: Negative eigenvals. when parallel solving
RE: Negative eigenvals. when parallel solving
OK, i got it.
If one does not state explicitely that the Domain-Decomposition-Solver should be used, the direct solver is invoked, leading to the behaviour described above.
The problems i had stem from using input files from an older ABQ-version + Umat. With input-files generated with the version i use, the preprocessor notes that parallelisation is not possible with the direct solver, and aborts.
greetings!