# HG changeset patch # User Masataka Kohagura # Date 1386658011 -32400 # Node ID 815e0fac48a3d74eade37fd3458cd76349972e89 # Parent c9b2998eb5169a80ab1187f9e4927d8c5d1d3626 remove some files diff -r c9b2998eb516 -r 815e0fac48a3 Dec-2013/12th.html --- a/Dec-2013/12th.html Tue Dec 10 15:25:07 2013 +0900 +++ /dev/null Thu Jan 01 00:00:00 1970 +0000 @@ -1,147 +0,0 @@ - - - - - - - 2013-11-12 - - - - - - - - - -
- - - -
-

- Cerium Task Manager -
- による正規表現の実装 -

-

- Masataka Kohagura -
- 12th November , 2013 -

-
- -
-

- 研究目的 -

-

- マルチコア CPU を最大限に活かすためには、並列プログラミングによる並列度を向上させなければならないが、実装が難しい。 - 当研究室では Cerium Libraryを提供することによって並列プログラミングを容易にしているが、ファイル読み込み等のI/O部分に関してはまだ実装されていない。 -

-

- 本研究ではその例題として正規表現を実装して、I/Oの並列化の設計・実装によって既存の正規表現の処理速度、処理効率を上げる。 -

-
- -
-

- 今週のしたこと -

-

- ・I/0並列化のシーケンス図まとめ -

-

- 文字列指定をできるようにプログラム中 -

-
- - -
-

I/O並列化のシーケンス図(mmap)

-
- -
-
  • - codeがシンプル(readを書いて読み込まなくていいため) -
    • -
  • - memoryより大きなファイルは開けない -
    • -
  • - readの先読みがOS依存 -
    • - -
    - -
    -

    I/O並列化のシーケンス図(single read)

    -
    - -
    -
  • - 明示的なread -
    • - -
  • - 先読みを自分で書ける(制御できる) -
    • - -
  • - codeが煩雑 -
    • - -
  • - memoryより大きなファイルを扱える(TB単位) -
    • - -
  • - mmapと比較して速くなるかどうかは不明 -
    • - -
    - -
    -

    I/O並列化のシーケンス図(multi read)

    -
    - -
    - -
  • - busが充分に速ければ、速くなる余地がある。 -
    • -
  • - HDDはコントローラーが基本的に1つのため、readを2つ用意しても並列にreadしてくれない -
    • -
  • - SSDだと読み込みがHDDと比較して爆速なため、もしかしたらSSD1つでも並列にreadできるのでは?? -
    • - -
    - -
    -

    - test -

    -
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