ruby - ルビーセルロイドと資源消費

Question

セルロイドは初めてで、プールと先物についていくつか質問があります。私は単純な Web クローラーを作成しています (下部の例を参照)。私の URLS 配列には数十万の URL があるため、この例は数百個に省略されています。

私が今やりたいことは、最大にグループ化することです。先物を使用して 50 リクエスト/秒、コールバックを取得し、さらに 50 個の URL をクロールするなど。入力データが増加すると、それ以上のリクエストを生成できないため、コードスニペットは終了します (OS の制限、私の場合は OSX)。

非常に多くのスレッドが生成されるのはなぜですか? また、これを回避するにはどうすればよいですか? OSが提供するすべてのリソースを使用する高速クローラーが必要ですが、これを超えることはありません:)したがって、OSXでは2.000スレッドが制限のようです。この値を超えると、コードがクラッシュします。

#!/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

クラスを分割します。内部でワーカーのプールを実行しないように wiki で指示されています。

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

注意: ワーカー内にプールを作成しないでください。

MyWorker 内で MyWorker.pool を使用すると、ワーカースレッドが際限なく爆発します。

アップデート

プールを制限したい場合は、 each_slice ブロックの外側に作成するだけで、常に同じスレッドを使用できると思います。

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

50 のスライスを反復するたびに、プールの値をリセットしています。これは、プールマネージャーを逆参照している可能性があります。アクターは逆参照されるだけではガベージコレクションされないため (#terminate を呼び出す必要があります)、古いプールを積み上げている可能性があります。それはすべきですプールを 1 つだけ作成し、一度にすべての先物を作成しても問題ありません (戻り値を小さくしておくと、未来オブジェクト自体は小さくなります)。スライスする必要があることがわかった場合は、プールを each_slice の外でインスタンス化すると、毎回新しいプールを作成せずに同じプールを使用し続けます。何らかの理由で毎回新しいプールを取得したい場合は、逆参照する前にプールで terminate を呼び出します。また、セルロイド 0.12.0+ で作業していることを確認してください。これにより、プールが終了したときにプールワーカーが終了しなかった問題が修正されます。

アクターを反復処理すると、アクターのリークがないことを確認するために、このちょっとしたログが役立つことがわかりました。

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

ruby - ルビーセルロイドと資源消費

2 に答える 2

アップデート

Related

Reference