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

[Dominik Szczerba]

Why would it happen only for np>8?

Dominik

On Sat, Aug 6, 2011 at 12:57 AM, Jed Brown <jedbrown at mcs.anl.gov> wrote:
> On Fri, Aug 5, 2011 at 16:41, Dominik Szczerba <dominik at itis.ethz.ch> wrote:
>>
>> I did not yet
>> valgrind etc. because I am in a desperate need to fix it quickly.
>
> It's usually harder to fix the problem by guessing than it is if you use
> tools designed to help you. In this case, I suspect that different processes
> are calling VecAssemblyBegin() and MatAssemblyBegin() with different
> arguments or in a different order.