如何在Julia中同时写入数组的多个索引? [英] How to write to multiple indices of an array at the same time in Julia?

问题描述

我想在Julia中看到类似的内容:

I would like to see something like this working in Julia:

using Distributed
addprocs(4)

@everywhere arr = Array{Int}(undef, 10)
for i = 1:10
    @spawn arr[i] = i
end

执行此操作的正确方法是什么?

What is the proper way of doing this?

推荐答案

您可以通过以下方式并行化该过程.

You have the following ways to parallelize the process.

1. 线程(需要设置JULIA_NUM_THREADS系统变量)

arr = Array{Int}(undef, 10)
Threads.@threads for i = 1:10
    arr[i] = i
end

SharedArrays

using Distributed, SharedArrays
addprocs(4)
arr = SharedVector{Int}(10)
@sync @distributed for i in 1:10
    arr[i] = i 
end

请注意，常见的错误是忘记将@sync放在没有聚合器功能的@distributed之前(请参见最后一个示例).

Note that a common error is to forget to place @sync before @distributed that does not have an aggregator function (see the last example).

汇总您的分布式计算结果

Aggregate the results of your distributed computation

using Distributed
addprocs(4)
arr = @distributed (append!) for i in 1:10
    [i]
end

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