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八百万のOSS

ミソラボ

毎回1つまたは複数のOSSを取り上げて、それについてエンジニアであるcatatsuyとへんてこで技術的なところも深掘りながら話をしていく番組です。 yaoyorozu-oss.henteko07.com/

PublishesWeeklyEpisodes8Founded2 months ago
Language
Japanese
Number of ListenersCategory
Technology

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Latest Episodes

キャッシュサーバmemcachedをGoで再実装したcatatsuy。

「マップに入れて返すだけでしょ」と思いきや、メモリを使い切る前にデータを捨てるeviction、最近使われていないデータを管理するLRU、そして素直なLRU実装では「GETがhitしてもリスト更新が走る」という落とし穴がありました。

read-heavyなキャッシュなのに、GETが書き込みに近い処理になる。この自作版ではLRUがボトルネックになり、コード上は1コアしか使わない実装になっていました。自作してみると、mapで... more

nginxは「速いWebサーバー」というより、Webアプリケーションの前段でクライアントとの通信を受け持つ定番OSSです。

遅いクライアント、大量接続、静的ファイル配信、gzip圧縮、バッファリング、キャッシュをnginxに任せることで、アプリケーションサーバーは本来の処理に集中できます。

今回は、C10K問題、イベント駆動、ノンブロッキングI/Oといったnginxの基本的な考え方から、静的ファイル配信、gzip、upstream keepalive、古いコピペ設定が変わりつつある話までを取... more

毎日使っているのに、ブラウザが中で何をしているか実はよく知らない——そんな話から始まる今回。

catatsuyが取り上げるのは、ChromiumやFirefoxが裏側で扱っている「巨大なデータ」です。

ブラウザはHTMLを描画するだけでなく、HTTPSへ強制するドメイン一覧、危険URLのリスト、証明書の失効情報、よく使われるリソースURLパターンなど、さまざまな補助データを持っています。しかし、それらを単純な巨大リストとしてそのまま持つのは難しく、毎回サーバーへ問い合わせるのもレイテンシやプ... more

Linuxを触っていれば必ずお世話になっているのに、意外と中身を知らないsystemd。

henteko の「OS起動時にプロセスを立ち上げる便利ツールでしょ?」という理解から話はスタートしますが、catatsuy が解き明かすその正体は想像のはるか上。依存関係の管理、死活監視、リソース制御、ソケットアクティベーション、cronより柔軟なタイマーまで——「何ができないのか」を探すレベルです。

Linuxサーバーを運用する人なら絶対に聞いてほしい一本です。

github.co... more

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