[mpich-discuss] “Invalid rank” error message MPICH2

Tue May 18 14:53:35 CDT 2021

The output indicates you have 2 MPI processes in your application. The ranks of those processes in MPI_COMM_WORLD would be 0 and 1, so 2 is not a valid destination rank for your message.

If your application requires more than 2 processes, you'll need to amend your launch settings to start more.

Ken

On 5/18/21, 2:47 PM, "Parviz Ghahramani via discuss" <discuss at mpich.org> wrote:

    Hi,
    I am trying to run a process for parallelization over 4 cores. This is run on Windows EC2 instance on AWS.  Initially I was getting error message that MPI rejected credentials. I entered and registered the credentials.  Now I get the following message “Invalid rank”.

    USING PARALLEL PROFILE C:\nm75g64\run\para300.pnm
    MPI TRANSFER TYPE SELECTED
    Building NONMEM Executable
    Starting MPI version of nonmem execution ...
    Manager Location EC2AMAZ-EP7B8E1\\c:\nm75g64\run
    Fatal error in MPI_Send: Invalid rank, error stack:
    MPI_Send(173): MPI_Send(buf=00000000037FFD40, count=1, MPI_INTEGER, dest=2, tag=2, MPI_COMM_WORLD) failed
    MPI_Send(98).: Invalid rank has value 2 but must be nonnegative and less than 2

    job aborted:
    rank: node: exit code[: error message]
    0: localhost: 1: process 0 exited without calling finalize
    1: localhost: 123  

    Can anyone provide guidance what this message is and how I can resolve it?

    Kind regards
    Parviz