multiprocessing

How to limit the number or parallel executions using Python multiprocessing – Queue(), Manager(), Pool() Question: Hej all, I am struggling to limit the number of parallel executions in the below Python code using multiprocessing – in particular Queue(), Manager() and Pool(). My understand was that multiprocessing.Pool(processes=2) would result in two workers running in parallel …

Finding an efficient way to distribute elements of a list between multiple processes in python Question: Suppose I have a list of strings like so: a = [‘string1’, ‘string2’, …, ‘stringN’] Was wondering what could be the most efficient way to make use of "8" processes using these "N" strings in the said list as …

Using throttler and joblib for heavy jobs and getting "cannot unpack non-iterable function object" Question: I have a lot of heavy jobs which need to send throttled HTTP requests (2 requests/sec) and calculate the results based on the response values. I use throttler to control the request rate, and use joblib to calculate the results …

Overriden `Process.run` does not execute asynchronously Question: Having subclassed Process.run import multiprocessing as mp import time DELAY = 2 class NewProcess(mp.get_context().Process): def run(self) -> None: # add new kwarg to item[4] slot old_que = self._args[0] new_que = mp.SimpleQueue() while not old_que.empty(): item = old_que.get() new_que.put( ( item[0], item[1], item[2], # Function item[3], # Arguments item[4] …

Python – Multiprocessing of multiple variable length iterators Question: I am having trouble identifying how to iterate over two unequal length lists in Python using multiprocessing. I basically want each value in each list to be computed against each other which I have been accomplishing in a nested loop. What I am finding is that …

Python code using multiprocessing works on Windows, but does not work on Ubuntu Question: I am trying to make the downloading of files from the server and their processing using a transformer model into separate processes. To practice working with a queue in multiprocessing, I wrote a small example that works fine on Windows, but …

Plotting with multiprocessing Question: Is it possible to plot in parallel processes? If not, can you please explain why this is the case? In the script below I’ve provided an example of plotting in a loop, a ThreadPool and a multiprocessing Pool. In the loop and ThreadPool things work as expected. In the multiprocessing Pool …

How to run several python scripts in one file concurrently? Question: I want to run several python scripts from the main file and make them work in parallel. I would like to print their outputs in a console if it is possible. It’s better to run them in different processes to be able to operate …

Can a process in Python multiprocessing start another process? Question: A long time ago, I had once faced the problem a long time ago with some library (I don’t recall which) that certain processes/threads (not the main process/threads) cannot create another thread. I am currently using asyncio and multiprocessing for creating separate threads of execution. …

Which multiprocessing method map or apply_async? Question: I have a function: def movingWinStretch(u0,u1): # u0,u1 are 1D arrays # do a bunch of stuff to u0 and u1 return C , epsArray, tSamp When I do this workflow on smaller amounts of data I use a couple of nested for loops to loop through the …