# Why has simple threading using \`threadid\` become so complex in v1.12...?

**URL:** https://discourse.julialang.org/t/why-has-simple-threading-using-threadid-become-so-complex-in-v1-12/129135
**Category:** Performance
**Created:** [May 19, 2025, 9:09am UTC](https://discourse.julialang.org/t/why-has-simple-threading-using-threadid-become-so-complex-in-v1-12/129135 "2025-05-19T09:09:39Z")
**Posts on this page:** 1
**Showing post:** 6

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### Author: ![nhz2](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/nhz2/32/44428_2.png) [@nhz2](https://discourse.julialang.org/u/nhz2)
#### Post date: [May 19, 2025, 2:57pm UTC](https://discourse.julialang.org/t/why-has-simple-threading-using-threadid-become-so-complex-in-v1-12/129135/6 "2025-05-19T14:57:20Z")

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The documentation for both OhMyThreads.jl and ChunkSplitters.jl do a great job at explaining how “simple” multithreading can work.

As an example, [using ChunkSplitters.jl](https://juliafolds2.github.io/ChunkSplitters.jl/stable/multithreading/#@threads-and-enumerate), you could do:

```julia
# setup
n = Threads.nthreads()
ds = mutable_datastructure()
dss = [deepcopy(ds) for _ in 1:n]
outputs = zeros(length(some_iterable))

Threads.@threads for (i, c) in enumerate(chunks(some_iterable; n=n))
    local ds = dss[i]
    for j in c
        outputs[j] = computation!(ds, j)
    end
end

```

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