はてなブックマーク

はじめに Web アプリケーションを開発している皆さん！ 日夜性能問題に悩まされていると思います😅 本記事では性能問題における 「CPU 使用率の見方」 に焦点をおいて話そうかと思います！ CPU あるある CPU にまつわる謎？ は大体次の２ケースかな〜、と思います。 ① クエリ応答が遅いからスケールアップ！ → あれ？変わらないぞ？ Web アプリ開発していると、API 応答が遅い → 原因は重いクエリ (SQL) というケースはよくあるかと思います。当然速度改善したいです。お金で簡単に解決できるならそうしたい。 例えば RDS のインスタンスタイプ db.r5.xlarge を今使っているとしましょう。 vCPU 数は 4 です。これを ２倍性能 の db.r5.2xlarge にしましょう！ db.r5.xlarge db.r5.2xlarge

ブラウザ JavaScript / Node.js の仕組みを知ろう！ ～トラブルに迅速に立ち向かえる様にHTMLJavaScriptNode.jsChromeAWS はじめに 近年 JavaScript の需要は増し、Web Application のほとんどは JavaScript を使って動いているのではないかと思います。 もともと JavaScript は DOM API (Document Object Model、HTML を JavaScript でから操作できる) の為にありました。DOM API を更に使いやすくした jQuery 等が流行りましたね。 しかし JavaScript の活用範囲は拡大し、現在では以下の様々な用途で利用されます。 フロントエンド JS 開発の環境 (Babel, Webpack) Web バックエンド ランタイムサーバー (Express)

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改行 \n は正規表現の記法ではないので、OS/Editorによってまちまち。 Windows ^(?!.*XXX).*\r\n Mac ^(?!.*XXX).*\n Eclipse ^(?!.*XXX).*\R ※ \R はPlatform independentな改行を表すEclipseの特殊文字. Register as a new user and use Qiita more conveniently You get articles that match your needsYou can efficiently read back useful informationYou can use dark themeWhat you can do with signing up

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Spockを使ってみたので、忘れないうちにメモ 試した環境 NetBeans 8.0.2 JDK8 Maven or Gradle NetBeansで "SpockTest" projectを作る NetBeansで、File... -> New Project... -> Maven -> Java Application Project name "SpockTest" pom.xmlを書き換える Projects/SpockTest/Project Files/pom.xmlの <dependencies> <build> <repositories> <pluginRepositories> にSpock用の記述を追加 <?xml version="1.0" encoding="UTF-8"?> <project xmlns="http://maven.apache.org/POM

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