According to the release notes: Tasks can now migrate among threads when they are re-scheduled. Previously, a Task would always run on whichever thread executed it first Does this mean that the thread I’m running on can no longer be controlled? I was working on an OpenGL project, and OpenGL requ…

Let’s not confuse threads with tasks here. Primarily, ThreadPinning.jl is for pinning Julia threads to specific cores. That’s it. Whether tasks are started on and/or stay on a certain Julia thread is an entirely different thing. [image] heyx3: Does this mean that the thread I’m running on can n…

That discussion leads to a package, ThreadPinning.jl, which only supports Linux. Is there really no standard way to do this? That seems like a serious regression; OpenGL isn’t the only un-thread-safe C library…

Thank you for the detailed explanation!

[image] heyx3: requires that all calls essentially happen on a single thread Isn’t it really that you can’t call OpenGL from multiple threads at once? Does it really know which OS thread it’s being called from? I mean, I suppose it might create some kind of thread local storage or something… …

An OpenGL “context” is attached to a specific thread, acting as a thread-local singleton. You can detach and reattach it to another thread, but it’s not a trivial process and certainly not something you want to have to constantly check for.

Julia 1.7 says it can switch the thread your task is on. How often does that happen, and how can it be disabled?

General Usage

Oscar_Smith January 28, 2022, 2:57pm 2

See Thread affinitization: pinning Julia threads to cores - #5 by carstenbauer

Topic		Replies	Views
Task affinity to threads General Usage question	10	1232	April 1, 2023
Thread affinitization: pinning Julia threads to cores General Usage multithreading	10	3985	January 27, 2022
What is julia doing with your threads? General Usage	23	1306	February 21, 2024
Making a task.sticky = false run in any thread New to Julia multithreading	2	755	September 7, 2022
Execute Function for each Julia Thread General Usage ccall , parallel , multithreading , ffi	6	177	November 15, 2025

Julia 1.7 says it can switch the thread your task is on. How often does that happen, and how can it be disabled?

Related topics