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fadis_'s profile
Fadis
Fadis
Fadis
@fadis_

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Fadis

@fadis_

組み込みから*NIXシステム、HPCまで、計算機をこよなく愛するゲームプログラマ。C++を関数型言語と間違えているタイプのC++er。遺伝的FM音源とかの人。 丼:@fadis@mstdn.jp 欲しい物リスト:http://amzn.to/Mzt8F0 

大阪
github.com/Fadis/
Joined July 2010

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    1. Fadis‏ @fadis_ 13 Jul 2013
      • Report Tweet
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      Replying to @kikairoya

      @kikairoya コピーしたイテレータ同士のデータが完全に独立してるイテレータなら、個々のスレッドがそれぞれイテレータを持ってインクリメントしても問題はないわけで、これと同等の機能は維持したい。そうするとメモ化したデータのコンテナに複数スレッドからアクセスがくることになる

      1 reply 0 retweets 1 like
    2. 対鉱物用武装‏ @kikairoya 13 Jul 2013
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      Replying to @fadis_

      @fadis_ それ何も考えずに deque と index で memoized values を管理したらそれで終わりなんじゃ

      1 reply 0 retweets 1 like
    3. Fadis‏ @fadis_ 13 Jul 2013
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      Replying to @kikairoya

      @kikairoya インクリメントする為にはsingle passのイテレータから新しい要素を読み出さなければならない状態にあるイテレータが2つあって、それらが同時にインクリメントした場合に、結果がわからなくなってしまうのでは

      1 reply 0 retweets 1 like
    4. 対鉱物用武装‏ @kikairoya 13 Jul 2013
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      Replying to @fadis_

      @fadis_ それは外でロックすべきな気がするけどなあ

      1 reply 0 retweets 1 like
    5. Fadis‏ @fadis_ 13 Jul 2013
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      Replying to @kikairoya

      @kikairoya むしろインクリメントの度にロックとかやりたくないから、lockfree listのテクニックを応用して綺麗に片付けられないかなーとか考えてたけど、難しくて悩んでた、ってのが今日までのあらすじ

      1 reply 0 retweets 1 like
    6. 対鉱物用武装‏ @kikairoya 13 Jul 2013
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      Replying to @fadis_

      @fadis_ ここで lock-free を出すとたぶんパフォーマンス上無視できない影響が出る気がするな

      1 reply 0 retweets 1 like
    7. Fadis‏ @fadis_ 13 Jul 2013
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      Replying to @kikairoya

      @kikairoya それ以前にBoost.Atomicのcasの抽象化のしかたが残念で(casの実装がABA問題が起こりうるものであるかどうかを知る術がない) あれの代わりを自前でアーキテクチャ毎に用意する必要があるってことが分かってorzしてた

      1 reply 0 retweets 0 likes
    8. 対鉱物用武装‏ @kikairoya 13 Jul 2013
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      Replying to @fadis_

      @fadis_ え、そこでなんで CAS が出てくるん…

      1 reply 0 retweets 0 likes
    9. Fadis‏ @fadis_ 13 Jul 2013
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      Replying to @kikairoya

      @kikairoya lockfree listのノードの追加削除と、single passイテレータからとってきた値がまだ入っていない状態と入っている状態の遷移をatomicにやるためにポインタのCASが必要

      1 reply 0 retweets 0 likes
    10. 対鉱物用武装‏ @kikairoya 13 Jul 2013
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      Replying to @fadis_

      @fadis_ え、じゃなくてなんで lock-free なの

      1 reply 0 retweets 0 likes
      Fadis‏ @fadis_ 13 Jul 2013
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      Replying to @kikairoya

      @kikairoya イテレータのデリファレンスとインクリメントの度にコンテナをロックしてるとスケールしない「んじゃないかと思った」

      9:30 AM - 13 Jul 2013
      2 replies 0 retweets 0 likes
        1. New conversation
        2. 対鉱物用武装‏ @kikairoya 13 Jul 2013
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          Replying to @fadis_

          @fadis_ read-write-lock で割といけるんじゃないの、 double-checked-locking+mfence にも出来るし

          1 reply 0 retweets 0 likes
        3. Fadis‏ @fadis_ 13 Jul 2013
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          Replying to @kikairoya

          @kikairoya 確かにロックを工夫する作戦はまるっきり考えてなかった ._.

          0 replies 0 retweets 0 likes
        4. End of conversation
        1. New conversation
        2. 対鉱物用武装‏ @kikairoya 13 Jul 2013
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          Replying to @fadis_

          @fadis_ lock-free にしたところでスケールさせるのめちゃくちゃ難しいのでは cc:@kumagi

          2 replies 0 retweets 0 likes
        3. 立木のポーズ界のカリスマ‏ @kumagi 13 Jul 2013
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          Replying to @kikairoya

          @kikairoya @fadis_ 並行処理におけるジャイアントロック以外での操作の保証として最もリッチな物が「線形化可能性」で、「操作の呼び出しから完了までのどこかの一瞬(線形化ポイント)で操作が行われた」と見做す物です。イテレータを通して何が線形化されて欲しいか不明では。

          0 replies 0 retweets 2 likes
        4. End of conversation

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