Skip to main content

Run many jobs using MPI processes through a master/slave approach

Project description

A Python3 library for running many jobs on multiple processes, using MPI.


The following example runs 3 jobs. For each of them, a message is printed on the screen.

from mpi4py import MPI
from time import sleep

import mpijobs

class MyJob(mpijobs.Job):
    def __init__(self,
        self.params = params
        self.result_str = None

    def run(self, rank):
        print("Hi, I am {0} (process {1})".format(self.params, rank))

        # Pretend you're doing something useful

        # Perform a simple computation and save the result
        self.result_str = self.params.upper()

JOB_LIST = [MyJob(name) for name in ('Bob', 'Alice', 'Stephen')]
RESULTS = mpijobs.run_event_loop(MPI.COMM_WORLD, JOB_LIST)

if MPI.COMM_WORLD.rank == 0: # Only one process should print the results
    print("strings computed by the processes = [{0}]"
          .format(', '.join([x.result_str for x in RESULTS])))
    print("elapsed_time = [{0}]"
          .format(', '.join([str(x.running_time) for x in RESULTS])))

The program must be run using mpirun (or an equivalent program, depending on your MPI library):

mpirun -n 3 python3

The output is the following (actual ranks and times might vary):

Hi, I am Stephen (process 2)
Hi, I am Alice (process 1)
Hi, I am Bob (process 1)
strings computed by the processes = [ALICE, STEPHEN, BOB]
elapsed_time = [0:00:01.001056, 0:00:01.001088, 0:00:01.001041]

Project details

Download files

Download the file for your platform. If you're not sure which to choose, learn more about installing packages.

Built Distribution

mpijobs-0.2.2-py3-none-any.whl (6.8 kB view hashes)

Uploaded py3

Supported by

AWS AWS Cloud computing Datadog Datadog Monitoring Facebook / Instagram Facebook / Instagram PSF Sponsor Fastly Fastly CDN Google Google Object Storage and Download Analytics Huawei Huawei PSF Sponsor Microsoft Microsoft PSF Sponsor NVIDIA NVIDIA PSF Sponsor Pingdom Pingdom Monitoring Salesforce Salesforce PSF Sponsor Sentry Sentry Error logging StatusPage StatusPage Status page