Running and Verification

Procedure

1. Use PuTTY to log in to the server as the root user.
2. Configure the environment variables of the ARPS executable file.

   export PATH=/path/to/ARPS/arps5.3.4/bin:$PATH

3. Go to the test directory.

   cd /path/to/ARPS/arps5.3.4/sounding

4. Run the serial ARPS.

   { time -p arps ../input/arps.input arps.output ; } 2>&1 | tee -a arps.log

5. Modify the input file arps.input.

   sed -i '211s/nproc_x = 1/nproc_x = 8/g' ../input/arps.input
   sed -i '212s/nproc_y = 1/nproc_y = 16/g' ../input/arps.input

   

   nproc_x indicates the number of processes in the x direction, and nproc_y indicates the number of processes in the y direction. The product of nproc_x and nproc_y must be the same as the value of np in 6.

6. Run the parallel ARPS.

   { time -p mpirun --allow-run-as-root -mca pml ucx -mca btl ^vader,tcp,openib,uct -x UCX_TLS=self,sm --bind-to core --map-by socket --rank-by core -x UCX_BUILTIN_ALLREDUCE_ALGORITHM=8 -np 128 arps_mpi ../input/arps.input arps.output ; } 2>&1 | tee -a arps_mpi_128.log

   

   The -np parameter indicates the total number of processes.

7. View the last line real in the arps.log and arps_mpi_128.log files. A smaller value indicates a higher performance.

   vi arps.log

   Or

   vi arps_mpi_128.log

   Note: The following floating-point exceptions are signalling: IEEE_UNDERFLOW_FLAG
   Note: The following floating-point exceptions are signalling: IEEE_UNDERFLOW_FLAG
   real 11.96
   user 1195.39
   sys 145.14