greenlet is a Python C-extension that adds lightweight coroutines to the language, useful for cooperative multitasking.
greenlet is a Python C-extension that adds lightweight coroutines to the language, useful for cooperative multitasking.
Questions tagged [greenlets]
150 questions
4
votes
2 answers
Correct greenlet termination
I am using gevent to download some html pages.
Some websites are way too slow, some stop serving requests after period of time. That is why I had to limit total time for a group of requests I make. For that I use gevent "Timeout".
timeout =…
Termos
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4
votes
1 answer
Catching exceptions raised in the greenlets
I'm trying to catch the exceptions raised within the greenlets. According to this tutorial, unfortunately 'exceptions raised in the Greenlet, stay inside the Greenlet'. In the code below, I have a sync method which spawns crawl greenlets. Those…
Arman
- 1,074
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4
votes
1 answer
Gevent greenlet bubbling up exceptions to the parent
In using gevent, whenever a child greenlet throws an exception, I would like it to bubble up to the parent (and ideally have the parent throw the exception). In the documentation for greenlets, it says this is automatically done, but this doesn't…
Jon Chu
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3
votes
1 answer
Gevent exceptions in Django when patching Python modules
I have installed the gevent and greenlet libraries and in the __init__.py file of my Djano application I dumped in these two lines:
from gevent import monkey
monkey.patch_all()
Now it's very often I see errors in my Django console that…
Mridang Agarwalla
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3
votes
1 answer
AWS can't import Python greenlet module
I created an AWS lambda with Python 3.6, which uses an external library not already in the AWS env.
Once deployed with serverless, I call the handler and it gives me the error:
START RequestId: 123456 Version: $LATEST
Unable to import module…
Barbi
- 139
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- 11
3
votes
1 answer
Flask-SQLAlchemy ERROR: 'No application found. Either work inside a view function or push'
I am in the process of trying to use flask-sqlalchemy, and I have followed numerous examples in the documentation of how to get the Flask application setup. However, I am not able to get the app context for some reason. I am currently using the…
Blaid
- 31
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3
votes
1 answer
Gevent blocked by flask even use monkey patch
I'm using the flask+gevent to build my server, but the gevent named 'getall' was blocked by flask, so the 'getall' function cannot print message in this code. The monkey patch is in use.
import time
import WSGICopyBody
from flask import…
vinllen
- 1,369
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3
votes
1 answer
Why do we need gevent.queue?
My understanding of Gevent is that it's merely concurrency and not parallelism. My understanding of concurrency mechanisms like Gevent and AsyncIO is that, nothing in the Python application is ever executing at the same time.
The closest you get…
Josh Russo
- 3,080
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3
votes
0 answers
Locust master process gets killed due to out of memory
Having a Locust master and slave setup with 8 slaves running om 8 AWS instances with 4 GB RAM and 64bit Ubuntu. ON setting the number of users to 500 and and hatch rate to 200 i see master process gets killed with-in 15 mins. MIN_WAIT & MAX_WAIT…
santosh
- 3,947
- 3
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3
votes
2 answers
Gevent: is it a good practice to yield in each for-loop iteration?
I'm coming from Node.js where libraries such as https://github.com/caolan/async allow to iterate asynchronously through arrays without blocking the event loop.
am I correct that achieving the same with Gevent can be done by calling sleep(0) on each…
Gal Ben-Haim
- 17,433
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3
votes
1 answer
What is the difference between 'kill' greenlet block or not
when I am trying to kill a greenlet using kill(), a 'block' param is default by True,
Greenlet.kill(self, exception, block, timeout)
the doc says:
If block is True (the default), wait until the greenlet dies or
the optional timeout expires. If…
user1221244
- 289
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3
votes
1 answer
Why does gevent execute this unjoined greenlet?
Code:
import gevent
import time
def func(a, t):
time.sleep(t)
print "got here", a
gevent.spawn(func, 'a', 4)
gevent.spawn(func, 'b', 0).join()
time.sleep(3)
print "exit"
Output:
got here a
got here b
exit
Expectation:
I never join on the…
ʞɔıu
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3
votes
2 answers
How to use gevent and tornado in a single application?
I'm working on using gevent and tornado inside the same application so that libraries that doesn't support tornado's ioloop can be subdued to use gevent to act asynchronously. I thought I'd need to run two real systems threads, one dedicated to…
Tony
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3
votes
1 answer
Deadlock with PyMongo and gevent
I am using PyMongo and gevent together, from a Django application. In production, it is hosted on Gunicorn.
I am creating a single Connection object at startup of my application. I have some background task running continuously and performing a…
Flavien
- 7,497
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2
votes
0 answers
python3.11 + Celery + Gevent -> "returned NULL without setting an exception"
When running celery worker on a container using python3.11 with redis as a broker - I am getting the following exception.
Downgrading to python 3.10 solves the problem, but is there another solution?
2023-08-04 11:10:28,805] [WARNING] [Dummy-748]…
DanielM
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