CODEWITHSUNDEEP
pythonflask
c z
c z

Reputation: 9027

Run Flask single threaded

I presently use system wide mutexes to handle multiprocessing in my Flask application.

Due to the GIL, and ultimately that the fact that multiprocessing will already provide me with concurrency, I'd like not to have to worry about multithreading in my application as well.

Can I get the Flask development server to run single threaded?

As an aside, if I deploy using Gunicorn, can this do the same (i.e. running multiple processes, all of which are single threaded)?

Upvotes: 4

Views: 3255

Answers (3)

c z
c z

Reputation: 9027

After looking at the source code, I see that Flask has the --without-threads parameter, which was added as a result of this bug report.

. . .
flask run --without-threads . . .

As far as I can tell it doesn't appear that the Flask documentation has been updated as a result of the bug fix, so the best documentation can be found in the bug report itself. You can query this property at run-time via flask.request.is_multithread.

Upvotes: 3

Ron Serruya
Ron Serruya

Reputation: 4446

The flask development server is only single-threaded by default, and yes you can use unicorn with the workers and thread flags 

gunicorn --workers=8 --threads=1

Upvotes: 2

Stanislav Lipovenko
Stanislav Lipovenko

Reputation: 574

you can run your application with gunicorn using parameters 'workers' and 'threads'

gunicorn --workers=5 --threads=1 main:app

it means that all workers will be run using single thread

Upvotes: 7

Related Questions