How to multithread creation of Array Julia

Question

I have some list of parameters and some complicated function that computes something based on these parameters. I then want to compute some list in the following way:

params = [1,2,3]
func(x) = x+1

myList = [ func(x) for x in params]

How can I apply multithreading to generate myList? I thought something like the following would work

myList = [func(x) @bthreads for x in params]

but it does not.

In my actual case, func(x) is a function that generates some matrix and returns its eigenvector with smallest eigenvalue. Does it even make sense to use threading on something like this? (The matrices are say 50x50, and I do this computation around 50x50 times)

Ruslan Osmanov · Accepted Answer · 2025-07-22 21:21:47Z

1

You can use Threads.@spawn inside a list comprehension to build the results asynchronously:

func(x) = x * x
params = [1, 2, 3]

list = fetch.([Threads.@spawn func(x) for x in params])

@show list
# list = [1, 4, 9]

The list comprehension builds a list of tasks. Then, fetch waits for each task to finish and returns a list of results.

answered Jul 22 at 21:21

Ruslan Osmanov

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