{"id":14862,"date":"2017-12-11T09:00:46","date_gmt":"2017-12-11T00:00:46","guid":{"rendered":"http:\/\/www.techscore.com\/blog\/?p=14862"},"modified":"2018-11-14T16:33:42","modified_gmt":"2018-11-14T07:33:42","slug":"identifying_performance_bottlenecks_with_jvisualvm","status":"publish","type":"post","link":"https:\/\/www.techscore.com\/blog\/2017\/12\/11\/identifying_performance_bottlenecks_with_jvisualvm\/","title":{"rendered":"Java VisualVM \u3067\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u306e\u30dc\u30c8\u30eb\u30cd\u30c3\u30af\u3092\u7a81\u304d\u6b62\u3081\u308b"},"content":{"rendered":"<p>\u3053\u308c\u306f <a href=\"http:\/\/www.techscore.com\/blog\/2017\/11\/28\/techscore-advent-calendar-2017\/\">TECHSCORE Advent Calendar 2017<\/a> \u306e 11 \u65e5\u76ee\u306e\u8a18\u4e8b\u3067\u3059\u3002<\/p>\n<p>\u4ee5\u524d\u3001CPU \u4f7f\u7528\u7387\u304c\u30dc\u30c8\u30eb\u30cd\u30c3\u30af\u306b\u306a\u3063\u3066\u3044\u308b\u51e6\u7406\u3092\u6539\u5584\u3059\u308b\u305f\u3081\u306b\u3001Java VisualVM \u3092\u5229\u7528\u3057\u3066\u9ad8\u8ca0\u8377\u306a\u51e6\u7406\u3092\u898b\u3064\u3051\u51fa\u3057\u307e\u3057\u305f\u3002<br \/>\n\u975e\u5e38\u306b\u4fbf\u5229\u306a\u30c4\u30fc\u30eb\u306a\u306e\u3067\u3001\u30b5\u30f3\u30d7\u30eb\u30d7\u30ed\u30b0\u30e9\u30e0\u3092\u7528\u3044\u3066\u7c21\u5358\u306b Java VisualVM \u306e\u4f7f\u3044\u65b9\u3092\u66f8\u3044\u3066\u307f\u307e\u3059\u3002<br \/>\n\u3053\u3053\u3067\u306e\u30b4\u30fc\u30eb\u306f\u3001CPU \u4f7f\u7528\u7387\u306e\u9ad8\u3044\u30e1\u30bd\u30c3\u30c9\u3092\u898b\u3064\u3051\u308b\u3053\u3068\u3067\u3059\u3002<\/p>\n<h2>Java VisualVM \u3068\u306f<\/h2>\n<p><a href=\"https:\/\/docs.oracle.com\/javase\/jp\/8\/docs\/technotes\/tools\/unix\/jvisualvm.html\">\u516c\u5f0f\u30b5\u30a4\u30c8<\/a>\u3088\u308a\u3002<\/p>\n<blockquote><p>Java VisualVM\u306f\u3001\u6307\u5b9a\u3055\u308c\u305fJava\u4eee\u60f3\u30de\u30b7\u30f3(JVM)\u3067Java\u30c6\u30af\u30ce\u30ed\u30b8\u30d9\u30fc\u30b9\u306e\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3(Java\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3)\u304c\u5b9f\u884c\u3055\u308c\u3066\u3044\u308b\u3068\u304d\u306b\u3001\u305d\u306eJava\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u306b\u95a2\u3059\u308b\u8a73\u7d30\u306a\u60c5\u5831\u3092\u63d0\u4f9b\u3059\u308b\u76f4\u611f\u7684\u306a\u30b0\u30e9\u30d5\u30a3\u30ab\u30eb\u30fb\u30e6\u30fc\u30b6\u30fc\u30fb\u30a4\u30f3\u30bf\u30d5\u30a7\u30fc\u30b9\u3067\u3059\u3002<\/p><\/blockquote>\n<p>\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u306e\u30e1\u30e2\u30ea\u4f7f\u7528\u7387\u30fbCPU\u4f7f\u7528\u7387\u30fb\u30b9\u30ec\u30c3\u30c9\u306e\u7a3c\u50cd\u72b6\u6cc1\u306a\u3069\u3001GUI \u3067\u8868\u793a\u3057\u3066\u304f\u308c\u308b\u30c4\u30fc\u30eb\u3067\u3059\u3002<\/p>\n<h2>\u30b5\u30f3\u30d7\u30eb\u30d7\u30ed\u30b0\u30e9\u30e0<\/h2>\n<p>HTML \u306e\u6700\u5f8c\u306b\u30b3\u30d4\u30fc\u30e9\u30a4\u30c8\u3092\u8ffd\u52a0\u3059\u308b\u3001\u3068\u3044\u3046\u7c21\u5358\u306a\u30b5\u30f3\u30d7\u30eb\u30d7\u30ed\u30b0\u30e9\u30e0\u3092\u7528\u610f\u3057\u307e\u3057\u305f\uff08\u30c6\u30f3\u30d7\u30ec\u30fc\u30c8\u4f7f\u3048\u3068\u304b\u3044\u3046\u30c4\u30c3\u30b3\u30df\u306f\u52d8\u5f01\u3057\u3066\u304f\u3060\u3055\u3044\uff09\u3002<br \/>\n\u30b3\u30d4\u30fc\u30e9\u30a4\u30c8\u3092\u8ffd\u52a0\u3059\u308b\u30e1\u30bd\u30c3\u30c9\u3092\u6301\u3064\u30af\u30e9\u30b9\uff08CopyrightAppender.java\uff09\u3068\u3001\u5b9f\u884c\u30af\u30e9\u30b9\uff08VisualvmTest.java\uff09\u3067\u3059\u3002<br \/>\n\u3053\u306e\u30d7\u30ed\u30b0\u30e9\u30e0\u306e\u51e6\u7406\u3092\u76e3\u8996\u3057\u3066\u307f\u307e\u3059\u3002<\/p>\n<pre class=\"toolbar:1 lang:java decode:true \" title=\"CopyrightAppender.java\">\r\nimport java.util.regex.Matcher;\r\nimport java.util.regex.Pattern;\r\n\r\npublic class CopyrightAppender {\r\n    private static final String COPYRIGHT_STRING = \"<br\/>(c) 2017 Synergy Marketing, Inc.\";\r\n    private static final Pattern BODY_END_TAG_PATTERN = Pattern.compile(\"<\/body>\", Pattern.CASE_INSENSITIVE);\r\n\r\n    \/**\r\n     * body \u30bf\u30b0\u5185\u306e\u6700\u5f8c\u306b\u30b3\u30d4\u30fc\u30e9\u30a4\u30c8\u6587\u5b57\u5217\u3092\u8ffd\u52a0\u3057\u3066\u8fd4\u3059\r\n     * @param HTML \u6587\u5b57\u5217\r\n     * @return \u30b3\u30d4\u30fc\u30e9\u30a4\u30c8\u3092\u8ffd\u52a0\u3057\u305f HTML \u6587\u5b57\u5217\r\n     *\/\r\n    public String append(String html) {\r\n        if (html == null) {\r\n            throw new IllegalArgumentException(\"html is required.\");\r\n        }\r\n        Matcher m = BODY_END_TAG_PATTERN.matcher(html);\r\n        if (m.find()) {\r\n            StringBuffer sb = new StringBuffer();\r\n            m.appendReplacement(sb, Matcher.quoteReplacement(COPYRIGHT_STRING + m.group(0)));\r\n            m.appendTail(sb);\r\n            return sb.toString();\r\n        }\r\n        return html; \/\/<\/body> \u30bf\u30b0\u304c\u307f\u3064\u304b\u3089\u306a\u3044\u5834\u5408\u306f\u5358\u7d14\u306b\u6e21\u3055\u308c\u305f\u6587\u5b57\u5217\u3092\u8fd4\u3059\u3060\u3051\u306b\u3057\u307e\u3059\r\n    }\r\n}\r\n<\/pre>\n<pre class=\"toolbar:1 lang:java decode:true \" title=\"VisualvmTest.java\">\r\npublic class VisualvmTest {\r\n\r\n    public static void main(String[] args) {\r\n        sleep(5000);\r\n\r\n        final String html = createHtml();\r\n        CopyrightAppender copyrightAppender = new CopyrightAppender();\r\n        for (int i = 0; i < 10000; i++) {\r\n            copyrightAppender.append(html); \/\/\u8ca0\u8377\u72b6\u6cc1\u304c\u308f\u304b\u308a\u3084\u3059\u3044\u3088\u3046\u306b\u51e6\u7406\u3092\u7e70\u308a\u8fd4\u3059\r\n        }\r\n\r\n        sleep(2000); \/\/\u30b5\u30f3\u30d7\u30e9\u306e\u66f4\u65b0\u3092\u5f85\u3064\r\n    }\r\n\r\n    \/**\r\n     * \u8ca0\u8377\u304c\u304b\u304b\u308b\u3088\u3046\u306b\u975e\u5e38\u306b\u9577\u3044 HTML \u3092\u4f5c\u6210\u3059\u308b\r\n     * @return HTML \u6587\u5b57\u5217\r\n     *\/\r\n    private static String createHtml() {\r\n        StringBuilder sb = new StringBuilder();\r\n        sb.append(\"<html>\");\r\n        sb.append(\"<body>\");\r\n        for (int i = 0; i < 100000; i++) {\r\n            sb.append(\"a\");\r\n        }\r\n        sb.append(\"<\/body>\");\r\n        sb.append(\"<\/html>\");\r\n        return sb.toString();\r\n    }\r\n\r\n    private static void sleep(long ms) {\r\n        try {\r\n            Thread.sleep(ms);\r\n        } catch (InterruptedException e) {\r\n            \/\/\u672c\u8cea\u304b\u3089\u96e2\u308c\u308b\u305f\u3081\u7701\u7565\u3057\u307e\u3059\r\n        }\r\n    }\r\n}\r\n<\/pre>\n<h2>Java VisualVM \u3092\u8d77\u52d5\u3059\u308b<\/h2>\n<p>Oracle JDK \u3092\u30a4\u30f3\u30b9\u30c8\u30fc\u30eb\u3057\u3066\u3044\u308b\u5834\u5408\u306f\u3001 Java VisualVM \u304c\u4ed8\u5c5e\u3057\u3066\u3044\u307e\u3059\u3002<br \/>\nOpenJDK \u306e\u5834\u5408\u306f\u4ed8\u5c5e\u3057\u3066\u3044\u307e\u305b\u3093\u306e\u3067\u3001\u4e0b\u8a18 URL \u304b\u3089 VisualVM \u304c\u30c0\u30a6\u30f3\u30ed\u30fc\u30c9\u3067\u304d\u307e\u3059\u3002<br \/>\n<a href=\"https:\/\/visualvm.github.io\/\">https:\/\/visualvm.github.io\/<\/a><\/p>\n<p>\u3053\u306e\u8a18\u4e8b\u3067\u306f Oracle JDK \u4ed8\u5c5e\u306e Java VisualVM \u3092\u5229\u7528\u3057\u307e\u3059\u304c\u3001VisualVM \u3067\u3082\u540c\u3058\u3088\u3046\u306b\u52d5\u304d\u307e\u3059\u3002<br \/>\nJDK \u3092\u30a4\u30f3\u30b9\u30c8\u30fc\u30eb\u3057\u305f\u30c7\u30a3\u30ec\u30af\u30c8\u30ea\u306e bin \u4ee5\u4e0b\u306b\u5b9f\u884c\u30d5\u30a1\u30a4\u30eb jvisualvm \u304c\u3042\u308a\u307e\u3059\u306e\u3067\u3001\u8d77\u52d5\u3057\u307e\u3059\u3002<\/p>\n<pre class=\"lang:sh decode:true \">\r\n$ \/usr\/bin\/jvisualvm\r\n<\/pre>\n<h2>\u5b9f\u969b\u306b\u53ef\u8996\u5316\u3057\u3066\u307f\u308b<\/h2>\n<p>\u30b5\u30f3\u30d7\u30eb\u30d7\u30ed\u30b0\u30e9\u30e0\u3092\u8d77\u52d5\u3057\u3066 jvisualvm \u3092\u898b\u3066\u307f\u307e\u3059\u3002\u3059\u308b\u3068\u3001\u5de6\u5074\u306e\u300c\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u300d\u306b\u30d7\u30ed\u30bb\u30b9\u304c\u8868\u793a\u3055\u308c\u307e\u3059\u306e\u3067\u30c0\u30d6\u30eb\u30af\u30ea\u30c3\u30af\u3067\u958b\u304d\u307e\u3059\u3002<br \/>\n\uff08\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u304c\u7d42\u4e86\u3059\u308b\u3068\u30d7\u30ed\u30bb\u30b9\u304c\u6d88\u3048\u308b\u305f\u3081\u3001\u8a66\u3055\u308c\u308b\u5834\u5408\u306f\u30c7\u30d0\u30c3\u30b0\u63a5\u7d9a\u3057\u3066\u505c\u6b62\u3059\u308b\u306a\u3069\u3057\u3066\u304f\u3060\u3055\u3044\uff09<br \/>\n<a href=\"https:\/\/www.techscore.com\/blog\/wp\/wp-content\/uploads\/2017\/12\/visualvm_1.png\" rel=\"facebox\" rel=\"attachment wp-att-15265\"><img loading=\"lazy\" src=\"https:\/\/www.techscore.com\/blog\/wp\/wp-content\/uploads\/2017\/12\/visualvm_1-300x169.png\" alt=\"\" width=\"300\" height=\"169\" class=\"alignnone size-medium wp-image-15265\" srcset=\"https:\/\/www.techscore.com\/blog\/wp\/wp-content\/uploads\/2017\/12\/visualvm_1-300x169.png 300w, https:\/\/www.techscore.com\/blog\/wp\/wp-content\/uploads\/2017\/12\/visualvm_1-768x433.png 768w, https:\/\/www.techscore.com\/blog\/wp\/wp-content\/uploads\/2017\/12\/visualvm_1.png 794w\" sizes=\"(max-width: 300px) 100vw, 300px\" \/><\/a><\/p>\n<p>\u300c\u6982\u8981\u300d\u300c\u76e3\u8996\u300d\u300c\u30b9\u30ec\u30c3\u30c9\u300d\u300c\u30b5\u30f3\u30d7\u30e9\u300d\u300c\u30d7\u30ed\u30d5\u30a1\u30a4\u30e9\u300d\u3068\u4e26\u3093\u3067\u3044\u307e\u3059\u3002<br \/>\n\u30e1\u30bd\u30c3\u30c9\u6bce\u306e CPU \u51e6\u7406\u6642\u9593\u3092\u76e3\u8996\u3067\u304d\u308b\u3082\u306e\u306f\u300c\u30b5\u30f3\u30d7\u30e9\u300d\u3068\u300c\u30d7\u30ed\u30d5\u30a1\u30a4\u30e9\u300d\u3067\u3001\u5927\u307e\u304b\u306a\u9055\u3044\u306f\u4ee5\u4e0b\u3067\u3059\u3002<\/p>\n<ul>\n<li>\u30d7\u30ed\u30d5\u30a1\u30a4\u30e9\u30fb\u30fb\u30fb\u30d7\u30ed\u30b0\u30e9\u30e0\u306e\u30d0\u30a4\u30c8\u30b3\u30fc\u30c9\u3092\u66f8\u304d\u63db\u3048\u51e6\u7406\u6642\u9593\u3092\u8a08\u6e2c\u3057\u307e\u3059\u3002\u6b63\u78ba\u306a\u60c5\u5831\u3092\u53d6\u5f97\u3067\u304d\u307e\u3059\u304c\u3001\u8ca0\u8377\u304c\u9ad8\u304f\u5b9f\u884c\u4e2d\u306e\u30d7\u30ed\u30b0\u30e9\u30e0\u304c\u58ca\u308c\u3066\u3057\u307e\u3046\u53ef\u80fd\u6027\u304c\u3042\u308a\u307e\u3059\u3002<\/li>\n<li>\u30b5\u30f3\u30d7\u30e9\u30fb\u30fb\u30fb\u30b9\u30ec\u30c3\u30c9\u30c0\u30f3\u30d7\u3092\u65ad\u7d9a\u7684\u306b\u51fa\u529b\u3057\u3066\u51e6\u7406\u6642\u9593\u3092\u8a08\u6e2c\u3057\u307e\u3059\u3002\u3042\u307e\u308a\u8ca0\u8377\u304c\u304b\u304b\u3089\u306a\u3044\u4e0a\u306b\u3053\u3061\u3089\u3067\u3082\u5341\u5206\u6b63\u78ba\u306e\u3088\u3046\u3067\u3001\u30d7\u30ed\u30b0\u30e9\u30e0\u306e\u30d0\u30a4\u30c8\u30b3\u30fc\u30c9\u3092\u5909\u3048\u305a\u306b\u52d5\u3044\u3066\u304f\u308c\u307e\u3059\u3002<\/li>\n<\/ul>\n<p>\u5b9f\u969b\u306b\u696d\u52d9\u3067\u30d7\u30ed\u30d5\u30a1\u30a4\u30e9\u3092\u4f7f\u7528\u3057\u305f\u3068\u304d\u306f\u8ca0\u8377\u304c\u9ad8\u304b\u3063\u305f\u4e0a\u306b\u30d7\u30ed\u30b0\u30e9\u30e0\u304c\u58ca\u308c\u3066\u3057\u307e\u3044\u307e\u3057\u305f\u3002<br \/>\n\u30b3\u30b9\u30d1\u306e\u512a\u308c\u3066\u3044\u308b\u30b5\u30f3\u30d7\u30e9\u3092\u4f7f\u3044\u307e\u3059\u3002<\/p>\n<p>\u300cCPU\u300d\u3092\u9078\u629e\u3057\u3001\u5148\u307b\u3069\u306e\u30d7\u30ed\u30b0\u30e9\u30e0\u3092\u8d77\u52d5\u3057\u3066\u76e3\u8996\u3057\u3066\u307f\u307e\u3059\u3002<\/p>\n<p><a href=\"https:\/\/www.techscore.com\/blog\/wp\/wp-content\/uploads\/2017\/12\/visualvm_2.png\" rel=\"facebox\" rel=\"attachment wp-att-15285\"><img loading=\"lazy\" src=\"https:\/\/www.techscore.com\/blog\/wp\/wp-content\/uploads\/2017\/12\/visualvm_2-300x123.png\" alt=\"\" width=\"300\" height=\"123\" class=\"alignnone size-medium wp-image-15285\" srcset=\"https:\/\/www.techscore.com\/blog\/wp\/wp-content\/uploads\/2017\/12\/visualvm_2-300x123.png 300w, https:\/\/www.techscore.com\/blog\/wp\/wp-content\/uploads\/2017\/12\/visualvm_2-768x316.png 768w, https:\/\/www.techscore.com\/blog\/wp\/wp-content\/uploads\/2017\/12\/visualvm_2-1024x421.png 1024w, https:\/\/www.techscore.com\/blog\/wp\/wp-content\/uploads\/2017\/12\/visualvm_2.png 1281w\" sizes=\"(max-width: 300px) 100vw, 300px\" \/><\/a><\/p>\n<p>\u79c1\u306e\u74b0\u5883\u3067\u306f\u4e0a\u56f3\u306e\u7d50\u679c\u306b\u306a\u308a\u307e\u3057\u305f\u3002<\/p>\n<p>VisualvmTest.sleep() \u306e\u300c\u30bb\u30eb\u30d5\u30fb\u30bf\u30a4\u30e0\uff08CPU\uff09\u300d\u306f 0.000 ms \u3067\u3001\u300c\u30bb\u30eb\u30d5\u30fb\u30bf\u30a4\u30e0\u300d\u304c 5.005 ms \u3067\u3059\u3002<br \/>\n\u300c\u30bb\u30eb\u30d5\u30fb\u30bf\u30a4\u30e0\u300d\u306f\u3001\u30e1\u30bd\u30c3\u30c9\u306e\u51e6\u7406\u6642\u9593\u3092\u8868\u3057\u3001\u300c\u30bb\u30eb\u30d5\u30fb\u30bf\u30a4\u30e0\uff08CPU\uff09\u300d\u306f\u3001\u5b9f\u969b\u306b CPU \u3092\u4f7f\u7528\u3057\u3066\u3044\u308b\u6642\u9593\u3092\u8868\u3057\u3066\u3044\u307e\u3059\u3002<br \/>\nVisualvmTest.sleep() \u306f CPU \u3092\u4f7f\u7528\u305b\u305a\u306b\u30d6\u30ed\u30c3\u30af\u3055\u308c\u3066\u5f85\u3063\u3066\u3044\u308b\u3060\u3051\u306e\u51e6\u7406\u3067\u3059\u306e\u3067\u3001\u3053\u306e\u3088\u3046\u306a\u7d50\u679c\u306b\u306a\u3063\u3066\u3044\u307e\u3059\u3002<br \/>\n\uff08\u6700\u7d42\u884c\u306e sleep(2000) \u304c\u53cd\u6620\u3055\u308c\u3066\u3044\u306a\u3044\u306e\u306f\u3001\u7d50\u679c\u304c\u53cd\u6620\u3055\u308c\u308b\u524d\u306b\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u304c\u7d42\u4e86\u3057\u305f\u305f\u3081\u3067\u3059\uff09<\/p>\n<p>\u4e00\u65b9\u3001CopyrightAppender.append() \u306f\u3001\u300c\u30bb\u30eb\u30d5\u30fb\u30bf\u30a4\u30e0\u300d\uff1d\u300c\u30bb\u30eb\u30d5\u30fb\u30bf\u30a4\u30e0\uff08CPU\uff09\u300d\u306b\u306a\u3063\u3066\u304a\u308a\u3001CPU \u3092\u30d5\u30eb\u306b\u4f7f\u3063\u305f\u51e6\u7406\u306b\u306a\u3063\u3066\u3044\u308b\u3053\u3068\u304c\u308f\u304b\u308a\u307e\u3059\u3002<\/p>\n<p>\u4eca\u56de\u306e\u30b5\u30f3\u30d7\u30eb\u30d7\u30ed\u30b0\u30e9\u30e0\u306f\u975e\u5e38\u306b\u5358\u7d14\u306a\u30b1\u30fc\u30b9\u3067\u3059\u304c\u3001GUI \u3067\u30e1\u30bd\u30c3\u30c9\u6bce\u306b\u51e6\u7406\u6642\u9593\u3092\u8868\u793a\u3057\u3066\u304f\u308c\u308b\u305f\u3081\u3001\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u306e\u30dc\u30c8\u30eb\u30cd\u30c3\u30af\u304c\u3072\u3068\u76ee\u3067\u308f\u304b\u308a\u307e\u3059\u3002<\/p>\n<p>\uff08\u5b9f\u969b\u306b\u696d\u52d9\u3067\u6539\u5584\u3057\u305f\u3068\u304d\u306e\u30ad\u30e3\u30d7\u30c1\u30e3\u304c\u6b8b\u3063\u3066\u3044\u305f\u306e\u3067\u63b2\u8f09\u3057\u307e\u3059\u3002\u5b9f\u969b\u306f\u3053\u306e\u56f3\u306e\u3088\u3046\u306b\u591a\u304f\u306e\u30e1\u30bd\u30c3\u30c9\u304c\u5b9f\u884c\u3055\u308c\u308b\u3068\u601d\u3044\u307e\u3059\u304c\u3001\u3069\u306e\u51e6\u7406\u306b\u6642\u9593\u304c\u304b\u304b\u3063\u3066\u3044\u308b\u304b\u3092 GUI \u3067\u76f4\u611f\u7684\u306b\u628a\u63e1\u3057\u3084\u3059\u3044\u3067\u3059\uff09<br \/>\n<a href=\"https:\/\/www.techscore.com\/blog\/wp\/wp-content\/uploads\/2017\/12\/jvisualvm_4.png\" rel=\"facebox\" rel=\"attachment wp-att-15297\"><img loading=\"lazy\" src=\"https:\/\/www.techscore.com\/blog\/wp\/wp-content\/uploads\/2017\/12\/jvisualvm_4-282x300.png\" alt=\"\" width=\"282\" height=\"300\" class=\"alignnone size-medium wp-image-15297\" srcset=\"https:\/\/www.techscore.com\/blog\/wp\/wp-content\/uploads\/2017\/12\/jvisualvm_4-282x300.png 282w, https:\/\/www.techscore.com\/blog\/wp\/wp-content\/uploads\/2017\/12\/jvisualvm_4.png 608w\" sizes=\"(max-width: 282px) 100vw, 282px\" \/><\/a><\/p>\n<h2>\u30b5\u30f3\u30d7\u30eb\u30d7\u30ed\u30b0\u30e9\u30e0\u3092\u6539\u5584\u3059\u308b<\/h2>\n<p>\u5927\u307e\u304b\u306a\u4f7f\u3044\u65b9\u304c\u308f\u304b\u3063\u305f\u3068\u3053\u308d\u3067\u3001\u5148\u307b\u3069\u306e\u30b5\u30f3\u30d7\u30eb\u30b3\u30fc\u30c9\u3092\u4fee\u6b63\u3057\u3066\u6539\u5584\u7d50\u679c\u3092\u898b\u3066\u307f\u307e\u3059\u3002<\/p>\n<p><span class=\"lang:default decode:true  crayon-inline \" >&lt;\/body&gt;<\/span> \u306f\u3001\u5148\u982d\u304b\u3089\u63a2\u7d22\u3059\u308b\u3088\u308a\u672b\u5c3e\u304b\u3089\u63a2\u7d22\u3057\u305f\u307b\u3046\u304c\u4e00\u822c\u7684\u306b\u306f\u65e9\u304f\u898b\u3064\u304b\u308a\u305d\u3046\u3067\u3059\u3002<\/p>\n<pre class=\"toolbar:1 lang:java mark:5,21,24 decode:true \" title=\"CopyrightAppender.java\">\r\nimport java.util.regex.Matcher;\r\nimport java.util.regex.Pattern;\r\n\r\n\/\/\u5909\u66f4\u70b91: StringUtils \u3092\u30a4\u30f3\u30dd\u30fc\u30c8\u3059\u308b\r\nimport org.apache.commons.lang3.StringUtils;\r\n\r\npublic class CopyrightAppender {\r\n    private static final String COPYRIGHT_STRING = \"<br\/>(c) 2017 Synergy Marketing, Inc.\";\r\n    private static final Pattern BODY_END_TAG_PATTERN = Pattern.compile(\"<\/body>\", Pattern.CASE_INSENSITIVE);\r\n\r\n    \/**\r\n     * body \u30bf\u30b0\u5185\u306e\u6700\u5f8c\u306b\u30b3\u30d4\u30fc\u30e9\u30a4\u30c8\u6587\u5b57\u5217\u3092\u8ffd\u52a0\u3057\u3066\u8fd4\u3059\r\n     * @param HTML \u6587\u5b57\u5217\r\n     * @return html \u30b3\u30d4\u30fc\u30e9\u30a4\u30c8\u3092\u8ffd\u52a0\u3057\u305f HTML \u6587\u5b57\u5217\r\n     *\/\r\n    public String append(String html) {\r\n        if (html == null) {\r\n            throw new IllegalArgumentException(\"html is required.\");\r\n        }\r\n        \/\/\u5909\u66f4\u70b92: <\/body> \u306e\u958b\u59cb\u4f4d\u7f6e\u3092\u672b\u5c3e\u304b\u3089\u63a2\u7d22\u3059\u308b\r\n        int bodyEndTagStartIndex = StringUtils.lastIndexOfIgnoreCase(html, \"<\/body>\");\r\n        Matcher m = BODY_END_TAG_PATTERN.matcher(html);\r\n        \/\/\u5909\u66f4\u70b93: <\/body> \u304c\u898b\u3064\u304b\u3063\u305f\u5834\u5408\u306f m.find() \u306e\u958b\u59cb\u4f4d\u7f6e\u3092 <\/body> \u306e\u958b\u59cb\u4f4d\u7f6e\u3067\u6307\u5b9a\u3059\u308b\r\n        if (bodyEndTagStartIndex >= 0 && m.find(bodyEndTagStartIndex)) {\r\n            StringBuffer sb = new StringBuffer();\r\n            m.appendReplacement(sb, Matcher.quoteReplacement(COPYRIGHT_STRING + m.group(0)));\r\n            m.appendTail(sb);\r\n            return sb.toString();\r\n        }\r\n        return html; \/\/<\/body> \u30bf\u30b0\u304c\u307f\u3064\u304b\u3089\u306a\u3044\u5834\u5408\u306f\u5358\u7d14\u306b\u6e21\u3055\u308c\u305f\u6587\u5b57\u5217\u3092\u8fd4\u3059\u3060\u3051\u306b\u3057\u307e\u3059\r\n    }\r\n}\r\n<\/pre>\n<p>\u4fee\u6b63\u5f8c\u306e\u76e3\u8996\u7d50\u679c\u3067\u3059\u3002<\/p>\n<p><a href=\"https:\/\/www.techscore.com\/blog\/wp\/wp-content\/uploads\/2017\/12\/visualvm_3.png\" rel=\"facebox\" rel=\"attachment wp-att-15284\"><img loading=\"lazy\" src=\"https:\/\/www.techscore.com\/blog\/wp\/wp-content\/uploads\/2017\/12\/visualvm_3-300x123.png\" alt=\"\" width=\"300\" height=\"123\" class=\"alignnone size-medium wp-image-15284\" srcset=\"https:\/\/www.techscore.com\/blog\/wp\/wp-content\/uploads\/2017\/12\/visualvm_3-300x123.png 300w, https:\/\/www.techscore.com\/blog\/wp\/wp-content\/uploads\/2017\/12\/visualvm_3-768x316.png 768w, https:\/\/www.techscore.com\/blog\/wp\/wp-content\/uploads\/2017\/12\/visualvm_3-1024x421.png 1024w, https:\/\/www.techscore.com\/blog\/wp\/wp-content\/uploads\/2017\/12\/visualvm_3.png 1281w\" sizes=\"(max-width: 300px) 100vw, 300px\" \/><\/a><\/p>\n<p>\u6539\u5584\u524d\uff1a11,093 ms<br \/>\n\u6539\u5584\u5f8c\uff1a1,798 ms<br \/>\n\uff081,697 ms\uff08CopyrightAppender.append()\uff09+ 101 ms\uff08StringUtils.lastIndexOfIgnoreCase()\uff09<\/p>\n<p>16% \u306e\u51e6\u7406\u6642\u9593\u306b\u6539\u5584\u3067\u304d\u307e\u3057\u305f\uff01<\/p>\n<h2>\u6700\u5f8c\u306b<\/h2>\n<p>\u4f8b\u3048\u3070 DB \u30a2\u30af\u30bb\u30b9\u3067\u5f85\u305f\u3055\u308c\u3066\u3044\u308b\u5834\u5408\u306f\u3001JDBC \u30c9\u30e9\u30a4\u30d0\u306e\u30e1\u30bd\u30c3\u30c9\u306e\u51e6\u7406\u6642\u9593\u304c\u8868\u793a\u3055\u308c\u308b\u306e\u3067\u3001\u30d7\u30ed\u30b0\u30e9\u30e0\u3067\u306a\u304f SQL \u3092\u4fee\u6b63\u3059\u308b\u3001\u3068\u3044\u3063\u305f\u5224\u65ad\u304c\u3067\u304d\u307e\u3059\u3002<br \/>\n\u307e\u305f\u3001\u3053\u306e\u8a18\u4e8b\u3067\u306f\u5272\u611b\u3057\u307e\u3059\u304c Java VisualVM \u306f\u30ea\u30e2\u30fc\u30c8\u63a5\u7d9a\u3057\u3066\u4f7f\u3046\u3053\u3068\u3082\u3067\u304d\u307e\u3059\u3002<br \/>\nGUI \u3067\u8868\u793a\u3057\u3066\u304f\u308c\u308b\u3068\u3001\u5168\u4f53\u304c\u628a\u63e1\u3057\u3084\u3059\u304f\u3068\u3066\u3082\u308f\u304b\u308a\u3084\u3059\u3044\u3067\u3059\u306d\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u3053\u308c\u306f TECHSCORE Advent Calendar 2017 \u306e 11 \u65e5\u76ee\u306e\u8a18\u4e8b\u3067\u3059\u3002<\/p>\n<p>\u4ee5\u524d\u3001CPU \u4f7f\u7528\u7387\u304c\u30dc\u30c8\u30eb\u30cd\u30c3\u30af\u306b\u306a\u3063\u3066\u3044\u308b\u51e6\u7406\u3092\u6539\u5584\u3059\u308b\u305f\u3081\u306b\u3001Java VisualVM \u3092\u5229\u7528\u3057\u3066\u9ad8\u8ca0\u8377\u306a\u51e6\u7406\u3092\u898b\u3064\u3051\u51fa\u3057\u307e\u3057\u305f\u3002<br \/><a href=\"https:\/\/www.techscore.com\/blog\/2017\/12\/11\/identifying_performance_bottlenecks_with_jvisualvm\/\">\u7d9a\u304d\u3092\u8aad\u3080...<\/a><\/p>\n","protected":false},"author":68,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[276,261,18],"tags":[141,57],"_links":{"self":[{"href":"https:\/\/www.techscore.com\/blog\/wp-json\/wp\/v2\/posts\/14862"}],"collection":[{"href":"https:\/\/www.techscore.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.techscore.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.techscore.com\/blog\/wp-json\/wp\/v2\/users\/68"}],"replies":[{"embeddable":true,"href":"https:\/\/www.techscore.com\/blog\/wp-json\/wp\/v2\/comments?post=14862"}],"version-history":[{"count":84,"href":"https:\/\/www.techscore.com\/blog\/wp-json\/wp\/v2\/posts\/14862\/revisions"}],"predecessor-version":[{"id":15902,"href":"https:\/\/www.techscore.com\/blog\/wp-json\/wp\/v2\/posts\/14862\/revisions\/15902"}],"wp:attachment":[{"href":"https:\/\/www.techscore.com\/blog\/wp-json\/wp\/v2\/media?parent=14862"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.techscore.com\/blog\/wp-json\/wp\/v2\/categories?post=14862"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.techscore.com\/blog\/wp-json\/wp\/v2\/tags?post=14862"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}