gil Questions
5
Solved
I'm embedding the python interpreter in a multithreaded C application and I'm a little confused as to what APIs I should use to ensure thread safety.
From what I gathered, when embedding python it...
Materiality asked 16/5, 2012 at 19:43
2
Solved
On this page I read this:
Coroutines in the asyncio module are not limited by the Global Interpreter Lock or GIL.
But how is this possible if both the asyncio event loop and the threading threads...
Baucis asked 1/4, 2023 at 15:29
0
I'm using FastAPI with non-async endpoints running over gunicorn with multiple workers, from the uvicorn.workers.UvicornWorker class as suggested here. Latley, I noticed high latency in some of our...
Plaster asked 5/12, 2022 at 8:39
0
There are PEP-554 and PEP-684. Both are designed to support multiple interpreters on Thread level.
Does anyone know if these PEPs are implemented somewhere at least in experimental or pre-release v...
Shall asked 27/9, 2022 at 12:7
2
Solved
This code creates a race condition:
import threading
ITERS = 100000
x = [0]
def worker():
for _ in range(ITERS):
x[0] += 1 # this line creates a race condition
# because it takes a value, incr...
Lafollette asked 27/12, 2021 at 8:55
1
Solved
The question
Is pybind11 somehow magically doing the work of PyGILState_Ensure() and PyGILState_Release()? And if not, how should I do it?
More details
There are many questions regarding passing a ...
1
Solved
If all the fastapi endpoints are defined as async def, then there will only be 1 thread that is running right? (assuming a single uvicorn worker).
Just wanted to confirm in such a setup, we will ne...
1
Solved
I am wondering, if python GIL allow only a single thread / process to run at once, why should I use asyncio, I get that switching between threads is expensive but, thats it? this is the only ...
Agogue asked 26/5, 2022 at 18:9
2
Solved
I have a Flask application that works fine when run on the commandline, but when it is run through uWSGI it doesn't respond correctly to requests or the worker thread doesn't work properly. I've re...
Dimitris asked 20/8, 2018 at 12:56
2
Solved
Python 3.2 introduced a new GIL implementation by Antoine Pitrou which exposes the function sys.setswitchinterval.
When would changing this be useful, and why?
Burney asked 11/9, 2011 at 6:52
1
I am investigating how Python's GIL works. I'm learning from the slides below, but I have one question.
http://www.dabeaz.com/python/UnderstandingGIL.pdf
This slide describes a new GIL from Pytho...
Accrescent asked 9/11, 2019 at 7:54
5
Solved
I am implementing a Python script that needs to keep sending 1500+ packets in parallel in less than 5 seconds each.
In a nutshell what I need is:
def send_pkts(ip):
#craft packet
while True:
#...
Wandis asked 24/10, 2016 at 15:58
1
Solved
I have some Cython code that I'd like to run as quickly as possible. Do I need to release the GIL in order to do this?
Let's suppose my code is similar to this:
import numpy as np
# trivial defini...
1
Solved
I think I must be missing something; this seems so right, but I can't see a way to do this.
Say you have a pure function in Python:
from math import sin, cos
def f(t):
x = 16 * sin(t) ** 3
y = 1...
Poodle asked 4/12, 2020 at 8:37
2
Solved
I designed a C++ system that invokes user defined callbacks from procedure running in a separate thread. Simplified system.hpp looks like this:
#pragma once
#include <atomic>
#include <c...
2
Solved
The documentation for concurrent.futures.ThreadPoolExecutor says:
Changed in version 3.5: If max_workers is None or not given, it will default to the number of processors on the machine, multipl...
Bellhop asked 18/5, 2019 at 3:12
3
I know GIL blocks python from running its threads across cores. If it does so, why python is being used in webservers, how are the companies like youtube, instagram handling it.
PS: I know alterna...
Blackdamp asked 20/4, 2018 at 5:56
2
Solved
Are there any caveats to it? I have a few questions related to it.
How costly is it to create more GILs? Is it any different from creating a separate python runtime? Once a new GIL is created, wil...
Demirelief asked 15/2, 2020 at 7:26
2
Solved
I'm reading 'Fluent Python' by 'Luciano Ramalho' over and over, but I couldn't understand asyncio.sleep's behavior inside asyncio.
Book says at one part:
Never use time.sleep in asyncio coroutines...
Jamal asked 21/6, 2020 at 2:13
2
Solved
From what I understood when doing research on the Python GIL, is that only one thread can be executed at the once (Whoever holds the lock). However, if that is true, then why would this code only t...
1
Solved
In context to this question What is “runtime”? (https://mcmap.net/q/63897/-what-is-quot-runtime-quot/3900561)
I am trying to understand what would a python runtime be made of. My guess is:
The ...
Shutdown asked 18/2, 2020 at 4:37
2
Solved
I've read an article about multithreading in Python where they trying to use Synchronization to solve race condition issue. And I've run the example code below to reproduce race condition issue:
i...
Yttriferous asked 21/12, 2019 at 13:16
2
This question is very similar to 400 threads in 20 processes outperform 400 threads in 4 processes while performing an I/O-bound task. The only difference is that the linked question is about an I/...
Gipson asked 23/5, 2019 at 11:54
1
400 threads in 20 processes outperform 400 threads in 4 processes while performing an I/O-bound task
Experimental Code
Here is the experimental code that can launch a specified number of worker processes and then launch a specified number of worker threads within each process and perform the task...
Nertie asked 23/5, 2019 at 9:55
2
Solved
I am researching and trying to understand the python GIL and best practices to use multithreading in python. I found this presentation and this video
I tried to reproduce the strange and crazy pro...
Agrippina asked 3/4, 2019 at 13:36
1 Next >
© 2022 - 2024 — McMap. All rights reserved.