[petsc-users] Fatal error in MPI_Allreduce: Error message texts are not available[cli_9]: aborting job:

[Jed Brown]

On Fri, Aug 5, 2011 at 16:58, Dominik Szczerba <dominik at itis.ethz.ch> wrote:

> Why would it happen only for np>8?


Depends on the logic in your code. I would start in a debugger with
breakpoints on the lines calling MatAssemblyBegin() and VecAssemblyBegin().
You can get line numbers from the stack trace you sent, if you are calling
those functions more than once.
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