Friday, April 11, 2014

[メモ] Starlet 0.22のリリースに伴いThundering Herd問題を再訪した件


で、それに伴いprefork型TCPサーバのThundering Herd問題を再訪したので、その備忘録。なお、Thundering Herd問題については、prefork サーバーと thundering herd 問題 - naoyaのはてなダイアリーや、Starman と Starlet のベンチマークと Accept Serialization - Hateburo: kazeburo hatenablogあたりを参照のこと。


こいつを書いてあるコメントのとおり実行してみることで、2種類のケースでThundering Herd問題が存在するか調べることができる。

  • accept(2)の呼出によるThundering Herd問題だが、多くの環境で過去の問題になったと考えてよい
  • select(2)で接続を待ち受け、次にaccept(2)を呼ぶようなケースでは、依然としてThundering Herd問題が存在する(当然と言えば当然だが)
とか言ってみたけど、、linux 2.6.32とOS X 10.8.5でしかテストしてないので、補足あれば教えてください m(__)m




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