Questions tagged [python-multiprocessing]

Multiprocessing is a Python package that enables the creation of separate processes with an API that closely resembles the threading module. If you have any inquiries about this subject, kindly specify the operating system you are using or include it in the tags for better assistance.

What could be causing the unusual behavior of multiprocessing.manager in Python?

After I input something and run the program, it goes into the main function but then prompts for input again. This issue is occurring when I run the program using command prompt on Windows version 3.8. import multiprocessing from concurrent.futures import ...

Is memory shared between Processes in a process pool affected by class attributes?

There is a class A that, when initialized, modifies a mutable class attribute called nums. Upon initializing the class using a Process pool with maxtasksperchild= 1, it appears that nums contains values from various processes, which is not the desired beh ...

Debugging multiple processes in Python using the pool map function in Visual Studio Code is not supported by the debugger

Hi, I'm currently working on debugging multi processes in Python. Below is a snippet of code where I am running multiple processes using the Pool module: pool = Pool(num_half_logical_cpus) pool_result_dict = pool.starmap(process_batches, lstListSets) Des ...

What could be causing my multi-process queue to exhibit un-threadsafe behavior?

I am currently developing a watchdog timer that is responsible for monitoring another Python program. If the watchdog timer fails to receive a check-in signal from any of the threads, it will shut down the entire program. This functionality is essential fo ...

What could be causing my Python multiprocessing pools to have idle workers?

As I divide a large text file into smaller chunks for further processing, the code utilizes a list of lists named text_chunks, each containing a section of text. The length of these sections varies from ~50 to ~15000 characters. Elsewhere in the code, ther ...

Leveraging the power of Python multiprocessing for executing calculations on objects

Looking for a way to efficiently update object attributes through parallel computing? I have multiple objects that require the same computation on their attributes, but they do not share information. The issue lies in the fact that processes within a proce ...

Ways to execute a singular python function concurrently on multiple occasions

I am looking to run a Python function in parallel 100 times. Can anyone provide the code snippet to achieve this? from selenium import webdriver from selenium.webdriver.common.keys import Keys from selenium import webdriver from selenium.webdriver.chrome ...

When utilizing the Billiard Multiprocessing package to insert data into a MySQL database, the data is triplicated in the process

I have a task in Airflow where I am loading data into a table. The process goes like this: query a database -> retrieve results as pandas data frame -> send the result set to multiple worker processes -> each worker process processes the rows and ...

Python 3.6 and above: FileNotFoundError issue arises with nested multiprocessing managers

While attempting to use multiprocessing Manager on a dictionary of dictionaries, I encountered an issue with my initial implementation: from multiprocessing import Process, Manager def task(stat): test['z'] += 1 test['y']['Y0'] += 5 if __name__ ...

I am currently exploring the concept of distributing read-only objects in a multiprocessing environment

I am currently exploring the concept of sharing read-only objects with multiprocessing. When I share the bigset as a global variable, everything works smoothly: from multiprocessing import Pool bigset = set(xrange(pow(10, 7))) def worker(x): return x ...

Python's concurrent.futures.ProcessPoolExecutor is equipped to handle a high volume of tasks with its extensive RAM capabilities

When running Python codes in parallel using concurrent.futures.ProcessPoolExecutor, I noticed that for larger values of n, there was a significant increase in RAM usage. Upon further investigation, it seemed that storing futures set (or list) was contribut ...

Running multiple processes simultaneously is not supported on Windows when using Jupyter Notebook

Currently, I'm running into issues with multiprocessing on Windows using Jupyter notebook. Instead of running all my async's in parallel, they are being executed serially one at a time. Can someone offer guidance on what might be going wrong? I need to s ...

Deliver a whopping one million messages to the queue within sixty seconds

I'm currently utilizing rabbitMQ for message reception. I have a million messages that need to be sent to the queue within a minute. Using multiprocessing in Python, my code is taking more than 5 minutes to send them all out. Is it feasible to achieve ...