Ruby Celluloid 和资源消耗

Question

我是 Celluloid 的新手，对矿池和 future 有一些疑问。我正在构建一个简单的网络爬虫(请参阅底部的示例)。我的 URLS 阵列有几十万个 URL，所以这个例子被剥离到几百个。

我现在要做的是分组到最大值。 50 req/s 使用 futures，获取它们的回调并进一步抓取 50 个 url 等。我对这段代码的问题:我希望它最多有 50 个线程，但在我的例子中它会产生多达 400 个或更多。如果输入数据增加，代码片段结束，因为它无法产生更多请求(操作系统限制，在我的例子中是 OSX)。

为什么会产生这么多线程，如何避免？我需要一个快速爬虫，它使用操作系统提供的所有资源，但不超过这个 :) 所以 2.000 个线程似乎是 OSX 的限制，所有超过这个值都会让代码崩溃。

#!/usr/bin/env jruby

require 'celluloid'
require 'open-uri'

URLS = 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class Crawler
  include Celluloid

  def fetch(id)
    uri = URI("http://api.instagram.com/oembed?url=#{id}")
    req = open(uri).read
  end
end

URLS.each_slice(50).map do |idset|
  pool = Crawler.pool(size: 50)
  crawlers = idset.to_a.map do |id|
    begin
      pool.future(:fetch, id)
    rescue
      nil
    end
  end
  crawlers.compact.each do |resp|
    puts resp.value.size rescue nil
  end
end

Answer 1

分类。在 wiki 上被告知永远不要在里面做一个 worker 池。

https://github.com/celluloid/celluloid/wiki/Pools

Gotcha: Don't make pools inside workers!

Using MyWorker.pool within MyWorker will result in an unbounded explosion of worker threads.

---

更新

如果你想限制你的池，只需在 each_slice block 之外创建它，这样你就可以始终使用相同的线程。

pool = Crawler.pool(size: 50)    
URLS.each_slice(50).map do |idset|  
  crawlers = idset.to_a.map do |id|
    begin
      pool.future(:fetch, id)
    rescue
      nil
    end
  end
# ...