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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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    Fadis‏ @fadis_ 9 May 2019
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    1500バイトのパケットが100GbEで流れてくる時、1パケットの処理に使える時間は120nsで、DRAMに何かを読みに行くとそれだけで50nsから100nsくらい持っていかれる為「CPUのキャッシュに当たらなければ即死」というマゾプログラミング環境が誕生するらしい

    9:39 PM - 9 May 2019
    • 586 Retweets
    • 1,083 Likes
    • 水無月唯&水無月行人 isuka ぱそほし(kzm) 固有値を求めたい@【技術書典中止】等々力テクノロジー 高卒工員プログラマー たぐろまる MaineK00n/刺身たんぽぽ Met Martinez Alex
    6 replies 586 retweets 1,083 likes
      1. New conversation
      2. d-kami‏ @d_kami 10 May 2019
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        Replying to @fadis_

        時代と共にレイヤーが上がる人と下がる人の差がやばそう…

        1 reply 3 retweets 12 likes
      3. Fadis‏ @fadis_ 10 May 2019
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        Replying to @d_kami

        CPUあんまり速くならないのに周辺デバイスがどんどん強くなるから、昔はソフトウェアだったものがどんどんハードウェアにオフロードされて「ハードウェアの1つ上」のレイヤーがどんどん高くなっていく現象(

        1 reply 18 retweets 45 likes
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      2. Takeshi HASEGAWA‏ @hasegaw 10 May 2019
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        Replying to @fadis_ @tmash06

        その場合のスレッド数はいくつぐらいなの?

        1 reply 1 retweet 1 like
      3. Fadis‏ @fadis_ 10 May 2019
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        Replying to @hasegaw @tmash06

        120nsになるのは1スレッドの場合です。なので、スレッド数が増えればもう少し時間に余裕ができると思います(この場合DRAMコントローラを共有する複数のプロセッサでDRAMを読みに行って詰まると台無しになりそうですが)

        1 reply 4 retweets 7 likes
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      2. K.Namba/ご注文は910ですか?‏ @ipv6labs 10 May 2019
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        Replying to @fadis_

        そろそろ 32k とか 64k 位のパケットサイズで・・・

        1 reply 1 retweet 1 like
      3. Fadis‏ @fadis_ 10 May 2019
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        Replying to @ipv6labs

        ジャンボフレーム(9000前後)でも心許ない感じになってきましたね

        1 reply 2 retweets 2 likes
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      1. Fhionnuisce@ななみん_ ☁‏ @Fhionnuisce 10 May 2019
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        Replying to @fadis_ @imksoo

        Kamuee(ボソッ

        0 replies 0 retweets 5 likes
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      1. 葛城玲‏ @rei_ktrg 10 May 2019
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        Replying to @fadis_

        ロングパケット化不可避ですね。

        0 replies 0 retweets 0 likes
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      1. わかつき@Emerald鯖‏ @wakatsuki_moe 10 May 2019
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        Replying to @fadis_ @ZLA151ARO

        計算が合わない気が;^^

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