
!mpiexec

Microsoft MPI Startup Program [Version 10.1.12498.52]

Launches an application on multiple hosts.

Usage:

    mpiexec [options] executable [args] [ : [options] exe [args] : ... ]
    mpiexec -configfile <file name>

Common options:

-n <num_processes>
-env <env_var_name> <env_var_value>
-wdir <working_directory>
-hosts n host1 [m1] host2 [m2] ... hostn [mn]
-cores <num_cores_per_host>
-lines
-debug [0-3]
-logfile <log file>

Examples:

    mpiexec -n 4 pi.exe
    mpiexec -hosts 1 server1 master : -n 8 worker

For a complete list of options, run mpiexec -help2
For a list of environment variables, run mpiexec -help3

You can reach the Microsoft MPI team via email at askmpi@microsoft.com


from mpi4py import MPI
size = MPI.COMM_WORLD.Get_size()
rank = MPI.COMM_WORLD.Get_rank()
pname = MPI.Get_processor_name()
print(f"Hello from {pname} - {rank}/{size}")

---------------------------------------------------------------------------
ModuleNotFoundError                       Traceback (most recent call last)
~\AppData\Local\Temp\ipykernel_10484\3061372955.py in <cell line: 0>()
----> 1 from mpi4py import MPI
      2 size = MPI.COMM_WORLD.Get_size()
      3 rank = MPI.COMM_WORLD.Get_rank()
      4 pname = MPI.Get_processor_name()
      5 print(f"Hello from {pname} - {rank}/{size}")

ModuleNotFoundError: No module named 'mpi4py'


!pip install mpi4py

Defaulting to user installation because normal site-packages is not writeable
Collecting mpi4py
  Downloading mpi4py-4.0.3-cp311-cp311-win_amd64.whl.metadata (10 kB)
Downloading mpi4py-4.0.3-cp311-cp311-win_amd64.whl (1.6 MB)
   ---------------------------------------- 1.6/1.6 MB 11.3 MB/s eta 0:00:00
Installing collected packages: mpi4py
Successfully installed mpi4py-4.0.3


from mpi4py import MPI
size = MPI.COMM_WORLD.Get_size()
rank = MPI.COMM_WORLD.Get_rank()
pname = MPI.Get_processor_name()
print(f"Hello from {pname} - {rank}/{size}")

Hello from pf-cai-p03-pc0 - 0/1


%%writefile mpi01.py
from mpi4py import MPI
size = MPI.COMM_WORLD.Get_size()
rank = MPI.COMM_WORLD.Get_rank()
pname = MPI.Get_processor_name()
print(f"Hello from {pname} - {rank}/{size}")

Writing mpi01.py


!mpiexec python mpi01.py

Hello from pf-cai-p03-pc0 - 4/6
Hello from pf-cai-p03-pc0 - 1/6
Hello from pf-cai-p03-pc0 - 5/6
Hello from pf-cai-p03-pc0 - 2/6
Hello from pf-cai-p03-pc0 - 0/6
Hello from pf-cai-p03-pc0 - 3/6


!mpiexec -n 4 python mpi01.py

Hello from pf-cai-p03-pc0 - 0/4
Hello from pf-cai-p03-pc0 - 2/4
Hello from pf-cai-p03-pc0 - 1/4
Hello from pf-cai-p03-pc0 - 3/4

MPI¶