如何在红宝石中制作多线程循环

Question

如何使这些循环与 ruby 的多线程功能并行？

1.

from = 'a' * 1
to = 'z' * 3

("#{from}".."#{to}").each do |combination|  
    # ...
end

阿拉伯数字。

@@alphabetSet_tr.length.times do |i|
    @@alphabetSet_tr.length.times do |j|
        @@alphabetSet_tr.length.times do |k|
            combination = @@alphabetSet_tr[i] + @@alphabetSet_tr[j] + @@alphabetSet_tr[k]
        end
    end
end

注意：@@alphabetSet_tr是一个包含 29 个项目的数组

Answer 1

如果要

利用内核，可以使用Queue在恒定数量的线程之间分配工作负载：

require 'thread'
queue = Queue.new
number_of_cores = 32
threads = (0..number_of_cores).map do
  Thread.new do
    combination = queue.pop
    while combination
      # do stuff with combination...
      # take the next combination from the queue
      combination = queue.pop
    end
  end
end
# fill the queue:
("#{from}".."#{to}").each do |combination|  
  queue << combination
end
# drain the threads
number_of_cores.times { queue << nil }
threads.each { |t| t.join }

如果您担心队列本身的大小会是一个问题 - 您可以使用SizedQueue如果它大于特定大小，它将阻止推送操作 - 限制其内存使用量 -

queue = SizedQueue.new(10000)

Answer 2

from = 'a' * 1
to = 'z' * 3

threads = ("#{from}".."#{to}").map do |combination|  
  Thread.new do
      # ...
  end
end
# In case you want the main thread waits all the child threads.
threads.each(&:join)