Question

我有这个代码使用并行gem来分割不同进程之间的工作。

Parallel.map(list, :in_processes=>4) do |item|
    if item.name == "A"
        puts "A"
    else
        puts "B"
    end
end

为了获得A和B的确切次数，在进程之间共享计数器的最佳方法是什么？

Answer 1

接收Parallel的返回值（每次迭代返回值的数组），并使用Array＃count方法。

list = ["A","B","A","B","A","B","A","B","A","B"]
result = Parallel.map(list, :in_processes=>4) do |item|
  if item == "A"
    puts "Got A"
    return "A"
  else
    puts "Got B"
    return "B"
  end
end

result # Array of "A" and "B" like ["A","B","A","A","B","B","A","A","B","B"]
# Now, you can do whatever you want with the result array.
count_a = result.count("A") # 5
count_b = result.count("B") # 5

（Ruby不需要显式返回关键字，但我这样做是为了避免任何误解。）

Ruby中并行进程的计数器

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