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from multiprocessing import Pool from functools import partial from tqdm import tqdm def imap_tqdm(function, iterable, processes, chunksize=1, desc=None, disable=False, **kwargs): """ Run a function in parallel with a tqdm progress bar and an arbitrary number of arguments.
officially, as per the documentation, multiprocessing.Pool does not work on interactive interpreter (such as Jupyter notebooks). See also this answer. unlike multiprocessing.Pool, multiprocessing.ThreadPool does work also in Jupyter notebooks; To make a generic Pool class working on both classic and interactive python interpreters I have made this:
Pool.starmap method, very much similar to map method besides it acceptance of multiple arguments. Async methods submit all the processes at once and retrieve the results once they are finished. Use get method to obtain the results. Pool.map (or Pool.apply)methods are very much similar to Python built-in map (or apply).
The name join is used because the multiprocessing module's API is meant to look as similar to the threading module's API, and the threading module uses join for its Thread object. Using the term join to mean "wait for a thread to complete" is common across many programming languages, so Python just adopted it as well.
Python multiprocessing is a package that supports spawning processes using an API similar to the threading module. The multiprocessing package offers true parallelism, effectively side-stepping the Global Interpreter Lock by using sub processes instead of threads. Use multiprocessing when you have CPU intensive tasks.
The fastest is the one that uses Pipes, followed by a Queue created using a Manager, followed by a standard multiprocessing.Queue. If you care about read performance while the queues are being written to, the best bet is to use a pipe or the managed queue. Here is the sourcecode for this new test with plots:
I have experimented a bit this week with multiprocessing. The fastest way that I discovered to do multiprocessing in python3 is using imap_unordered, at least in my scenario. Here is a script you can experiment with using your scenario to figure out what works best for you:
I'm fairly new to python programming and need some help understanding the python interpreter flow, especially in the case of multiprocessing. Please note that I'm running python 3.7.1 on Windows 1...
I am using concurrent.futures module to do multiprocessing and multithreading. I am running it on a 8 core machine with 16GB RAM, intel i7 8th Gen processor. I tried this on Python 3.7.2 and even on
for item in degreelist: test = mp.Process(target=_all_simple_paths_graph, args=(DG, cutoff, item, memorizedPaths, filepaths)) test.start() test.join() end = time.clock() print (end-start) Currently - though luck and magic - it works (sort of). My problem is I'm only using 12 of my 24 cores.