ruby - 红宝石赛璐珞和资源消耗

Question

我是赛璐珞的新手，对池和期货有一些疑问。我正在构建一个简单的网络爬虫（参见底部的示例）。我的 URLS 数组有几十万个 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 使用期货，获取他们的回调并进一步抓取 50 个 url 等。我对这段代码的问题：我希望它最多可以有 50 个线程，但在我的情况下它会产生多达 400 个甚至更多。如果输入数据增加，代码片段将完成，因为它无法产生更多请求（操作系统限制，在我的情况下为 OSX）。

为什么会产生这么多线程以及如何避免这种情况？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

score 3 · Accepted Answer

分班。维基上被告知永远不要在其中做一个工人池。

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

Gotcha：不要在工人内部建立游泳池！

在 MyWorker 中使用 MyWorker.pool 将导致工作线程的无限爆炸。

更新

如果你想限制你的池，只需在 each_slice 块之外创建它，这样你就可以使用我猜的相同线程。

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
# ...

score 1 · Accepted Answer

通过 50 的切片的每次迭代，您都会重置 pool 的值，这可能会取消引用您的 poolmanager。由于演员不会仅仅通过取消引用而被垃圾收集（你必须调用#terminate），你可能会堆积你的旧池。它应该可以只创建一个池，并一次创建所有期货（如果您保持返回值很小，那么未来对象本身就很小）。如果您确实发现必须进行切片，请在 each_slice 之外实例化您的池，它将继续使用同一个池，而不会每次都创建一个新池。如果出于某种其他原因您希望每次都获得一个新池，请在取消引用之前调用该池的终止。还要确保您使用的是赛璐珞 0.12.0+，因为它解决了池工作人员在池终止时没有被终止的问题。

当我围绕演员进行迭代时，我发现这一点日志记录对于确保我没有任何演员泄漏很有用：

logger.info "Actors left: #{Celluloid::Actor.all.to_set.length} Alive: #{Celluloid::Actor.all.to_set.reject { |a| a.nil? || !a.alive? }.length}"

ruby - 红宝石赛璐珞和资源消耗

2 回答 2

更新

Related

Reference