Commit bd5a998d authored by Stanislav Bohm's avatar Stanislav Bohm
Browse files

A simple example added

parent aa5a2203
MIT License
Copyright (c) 2019-present, Stanislav Bohm
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#
# The following example submits two MPI tasks
# - The first one takes no parameters, runs on 1 node and produces 4 outputs
# - The second one runs on 4 nodes, takes a configuration (the same for each process)
# and each MPI rank gets 1 output from task 1.
#
#
# /---------------------------\
# | Task 1 (my_preprocessing) |
# |---------------------------|
# | Rank 0 |
# | Out1 Out2 Out3 Out4 |
# \---------------------------/
# | | | \----------------\
# | | | |
# | | \----------\ |
# | | | |
# | \-----\ | |
# v v v v
# /---------------------------------------\
# | Task 2 (my_computation) |
# |---------------------------------------|
# | Rank 0 | Rank 1 | Rank 0 | Rank 0 |
# \---------------------------------------/
import quake.client as quake
@quake.mpi_task(n_processes=1, n_outputs=4)
def my_preprocessing():
# Let us produce 4 pieces of something in a simple MPI application with 1 process
return ["something1", "something2", "something3", "something4"]
@quake.mpi_task(n_processes=4)
@quake.arg("my_data", layout="scatter")
def my_computation(my_config, my_data):
# This is called in 4 MPI processes
from mpi4py import MPI
comm = MPI.COMM_WORLD
rank = comm.Get_rank()
return "Computation at rank {}: configuration={}, data={}".format(
rank, my_config, my_data
)
# Creating a plan
data = my_preprocessing()
computation = my_computation("my_configuration", data)
# Submitting the plan & waiting for results
result = quake.gather(computation)
for i, r in enumerate(result):
print("Output {}: {}".format(i, r))
# The expected output:
# Output 0: Computation at rank 0: configuration=my_configuration, data=something1
# Output 1: Computation at rank 1: configuration=my_configuration, data=something2
# Output 2: Computation at rank 2: configuration=my_configuration, data=something3
# Output 3: Computation at rank 3: configuration=my_configuration, data=something4
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