How to suppress LAMMPS output from all but rank 0 when using Intel MPI?

ppk1 — Thu, 15 May 2025 04:37:51 GMT

Hello everyone,

I am running LAMMPS using OpenMPI on both AMD and Intel CPUs.

When I run LAMMPS on an AMD system using `mpirun` built with AOCC, the screen output only shows messages from rank 0, which is convenient.

However, when I run LAMMPS on an Intel CPU using `mpirun` from Intel oneAPI (Intel MPI), the output includes messages from **all ranks**, making it difficult to monitor the simulation status.

Is there a way to configure `mpirun` or Intel MPI so that only rank 0 prints output to the screen (as OpenMPI+AOCC seems to do by default)?

Best regards,

Re: How to suppress LAMMPS output from all but rank 0 when using Intel MPI?

TobiasK — Thu, 15 May 2025 07:20:02 GMT

@ppk1
I am not sure if I understand what you are trying to archive. You can use:

-outfile-pattern <file>
Use this option to redirect stdout to the specified file.

-errfile-pattern <file>
Use this option to redirect stderr to the specified file.

e.g. -outfile-patter %r_out
to generate a separate outputfile (#rank_out in this example) for each rank.

Could you please give some example of what is exactly different?

topic How to suppress LAMMPS output from all but rank 0 when using Intel MPI? in Intel® MPI Library

How to suppress LAMMPS output from all but rank 0 when using Intel MPI?

Re: How to suppress LAMMPS output from all but rank 0 when using Intel MPI?