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nhiroki
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nhiroki

@nhiroki_

Software Engineer. Chrome developer (owner of web/service workers etc). Father of two boys. IIDX (SP 皆伝・DP 九段). Interested in computer systems and astrophysics.

Tokyo, Japan
nhiroki.jp/about/
Joined May 2009

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    nhiroki‏ @nhiroki_ 25 Feb 2019
    • Report Tweet

    C/C++ 向けメモリアロケータ MESH の論文を読んだので記事にまとめました。Chromium での議論についてもちょろっと触れてます / "論文「MESH: Compacting Memory Management for C/C++ Applications」(PLDI 2019) - nhiroki's weblog"https://nhiroki.jp/2019/02/26/paper-mesh-compacting-memory-management …

    7:49 PM - 25 Feb 2019
    • 82 Retweets
    • 167 Likes
    • 山口陽平 RIO 高梨陣平 matzy もっちぃ Kohei Yamaguchi Hirofumi Miki MIURA Toru The おっさん 2020
    2 replies 82 retweets 167 likes
      1. New conversation
      2. nhiroki‏ @nhiroki_ 26 Feb 2019
        • Report Tweet

        MESH の特徴の項に「メモリ割り当てにランダム性を導入することで meshing しやすくしているのが新規性」という旨の追記をしました。リロケーションせずにコンパクションする手法自体は MESH が初出ではなく、それを実用的なレベルにしたというのがこの研究の貢献という理解です。

        1 reply 1 retweet 5 likes
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      3. nhiroki‏ @nhiroki_ 26 Feb 2019
        • Report Tweet

        そういえば mesh 処理が行われる頻度についてブログ記事に書くつもりだったのに忘れてた。起動時 or 実行時にパラメータで指定可能で、デフォルトでは 100 msec 毎に実行して、もし一定量以下の mesh が行えなかったら、メモリ割り当て・解放がある程度進むまでタイマーを止めるそうです。

        1 reply 1 retweet 3 likes
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      4. nhiroki‏ @nhiroki_ 26 Feb 2019
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        s/一定量以下/一定量以上/

        1 reply 1 retweet 0 likes
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      5. nhiroki‏ @nhiroki_ 26 Feb 2019
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        remap_file_pages() を使うと VMA 構造体を節約できそうだなと思いきや、非推奨機能になってるのか https://linuxjm.osdn.jp/html/LDP_man-pages/man2/remap_file_pages.2.html …

        0 replies 0 retweets 1 like
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      6. End of conversation
      1. New conversation
      2. _ko1‏ @_ko1 26 Feb 2019
        • Report Tweet
        Replying to @nhiroki_

        すごいわかりやすかったです! ユーザレベルで仮想メモリハックができるんだって同じところで感心してた。

        1 reply 0 retweets 2 likes
      3. nhiroki‏ @nhiroki_ 26 Feb 2019
        • Report Tweet
        Replying to @_ko1

        ありがとうございます!そう言ってもらえると頑張って書いた甲斐があります :) 他にどんな使いみちがあるのか謎ですが、面白いテクニックですよね。

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