Hi everyone, I’m trying to do something that feels like should be easy but I can’t figure it out. Basically, let’s say I have a function (doer) which takes a while to run and I want to have another function printer printing stuff to stdout while doer is running - without messing with doer itself. …

@spawn doer() also seems to work, I guess thread 1 have higher priority?

Try for k in 1:50000 x = rand(100, 100) y = x.^2 .- rand(100, 100) yield() # <-- Allows switching over to other tasks. end Or better yet, thread the loop as well Threads.@spawn begin for k in 1:50000 x = rand(100, 100) y = x.^2 .- rand(100, 100…

I first tried accumulating from the loop so it couldn’t be removed by dead code elimination. That didn’t seem to make a difference. Then I remembered that GC pauses all threads, and I noticed the code was very allocating; I made the operations in the loop non-allocating, and suddenly got tons of pri…

[image] FedeClaudi: The motivation for this is that in Term.jl I need to have a function rendering progress bars information while user’s code runs. I can’t edit the user’s code and I want the progress bar rendering to happen continuously in the background. This might need Add threadpool supp…

Which Julia version are you on? Your GC-free loop is just as blocking for me on Julia 1.7.2 (Windows).

I just realized I had a simple mistake; I edited the post. It is not working for me either now, 1.7.2 MacOS.

Thanks everyon for looking into this, I really appreciate the help. @skleinbo 'and @chengchingwen had it right: wrapping doer or its content in another @spaw makes it work like a charm, I’ve also added a wait on the task generated by @spawn doer() and it does exactly what I need. Progress bar in Te…

Maybe it’s worth reading how ProgressMeter do or even wrap that? It also support multi-threading and is thread-safe.

A similar topic was already discussed here: [image] No real multithreading possible? General Usage Hey there, I am desperately trying to figure out how to do some “real” multi-threadding in Julia. What do I mean by that: My program consists of three tasks: the main task a…

Thanks, I looked for related topics but had missed this one.

Printing in a background process

General Usage

feanor12 May 22, 2022, 11:20am 10

A similar topic was already discussed here:

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Update stdout while a function is running General Usage parallel	8	831	January 26, 2023
Background processes in julia General Usage	3	1712	September 16, 2018
Track progress of multiple threads General Usage question	17	1831	June 4, 2023
Threads.at-spawn: idle threads when printing General Usage multithreading	0	302	September 16, 2022
One trick to get to background-only threads General Usage multithreading	3	1163	August 21, 2020

Printing in a background process

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