I have an existing Fortran module that I want to run in parallel. For example, I want 8 instances of the module, each with its own variable scope, all working at once. Is that possible with f2py? From the documentation, it seems that when you import a module, you only have access to a single copy of the Fortran object.
I'm newish to Python and very new to Fortran, so let me know if this approach is even worth investigating.
Yes you can run your imported functions from the f2py-object like any other function in parallel, for example using concurrent.futures. For example, it can look like this on the python side:
import concurrent.futures as cf
import f2py_module as fm
# Or if a fortran module "my_module" is wrapped, do
from f2py_module import my_module as fm
print (fm.__doc__) # to see functions definitions, comment out
def task(arg):
"""This wrapper is not needed, but usually convenient to define
redundant arguments or transforming the result somehow"""
res = fm.calculate(arg) # calculate is a Fortran subroutine
return res
PEX = cf.ProcessPoolExecutor(4) # 4 threads here
args = [1,2,3,4,5]
processes = [PEX.submit(task,arg) for arg in args]
res = [pr.result() for pr in processes]
for re in res:
print(re)