{"id":130,"date":"2012-06-13T00:02:29","date_gmt":"2012-06-12T15:02:29","guid":{"rendered":"http:\/\/yucchi.jp\/blog\/?p=130"},"modified":"2013-04-24T22:22:19","modified_gmt":"2013-04-24T13:22:19","slug":"%e5%86%86%e5%91%a8%e7%8e%87%e3%82%92%e3%83%a2%e3%83%b3%e3%83%86%e3%82%ab%e3%83%ab%e3%83%ad%e6%b3%95%e3%81%a7%e6%b1%82%e3%82%81%e3%82%8b-vol-2","status":"publish","type":"post","link":"http:\/\/yucchi.jp\/blog\/?p=130","title":{"rendered":"\u5186\u5468\u7387\u3092\u30e2\u30f3\u30c6\u30ab\u30eb\u30ed\u6cd5\u3067\u6c42\u3081\u308b vol.2"},"content":{"rendered":"<p><font size=\"3\">\u6628\u65e5\u3001\u30e2\u30f3\u30c6\u30ab\u30eb\u30ed\u6cd5\u306b\u3066\u5186\u5468\u7387\u3092\u6c42\u3081\u308b\u30d7\u30ed\u30b0\u30e9\u30e0\u3092\u3064\u304f\u3063\u305f\u3002<\/font><\/p>\n<p><font size=\"3\">\u4e71\u6570\u30b7\u30e5\u30df\u30ec\u30fc\u30b7\u30e7\u30f3\u3068\u3057\u3066\u306f\u3001\u307e\u3041\u307e\u3041\u306e\u6570\u5024\u3092\u5c0e\u304d\u51fa\u3057\u3066\u3044\u308b\u3068\u500b\u4eba\u7684\u306b\u306f\u601d\u3063\u305f\u3002<\/font><\/p>\n<p><font size=\"3\">\u3055\u3089\u306b\u7cbe\u5ea6\u3092\u4e0a\u3052\u3088\u3046\u3068\u3057\u3066\u4f55\u56de\u304b\u540c\u3058\u51e6\u7406\u3092\u3057\u3066\u5e73\u5747\u5024\u3092\u53d6\u308c\u3070\u3044\u3044\u304b\u306a\uff1f\u3068\u601d\u3044<\/font><\/p>\n<p><font size=\"3\">\u6b21\u306e\u3088\u3046\u306b\u30d7\u30ed\u30b0\u30e9\u30e0\u3092\u5909\u66f4\u3057\u3066\u307f\u307e\u3057\u305f\u3002<\/font><\/p>\n<p><font color=\"#ff0000\" size=\"4\"><strong>\u306f\u3058\u3081\u306b\u4e8c\u91cd\u30eb\u30fc\u30d7\u3092\u4f7f\u3044\u5e73\u5747\u5024\u3092\u6c42\u3081\u308b\u30d7\u30ed\u30b0\u30e9\u30e0\u3092\u7d44\u3093\u3067\u3057\u307e\u3063\u3066<\/strong><\/font><\/p>\n<p><font color=\"#ff0000\" size=\"4\"><strong>\u975e\u5e38\u306b\u52b9\u7387\u304c\u60aa\u3044\u3053\u3068\u306b\u6c17\u304c\u4ed8\u3044\u305f\u306e\u306f\u79d8\u5bc6\u3067\u3059\u3002(\uff1b\u00b4\u0414\uff40)<\/strong><\/font><\/p>\n<p><font size=\"3\">\u76f8\u5909\u308f\u3089\u305a\u6c5a\u3044\u30b3\u30fc\u30c9\u3067\u3059\u304c\u7d20\u4eba\u306e\u3084\u308b\u3053\u3068\u3067\u3059\u304b\u3089\u30d7\u30ed\u30d5\u30a7\u30c3\u30b7\u30e7\u30ca\u30eb\u306a\u4eba\u306f<\/font><\/p>\n<p><font size=\"3\">\u512a\u3057\u304f\u89e3\u308a\u3084\u3059\u304f\u3054\u6307\u6458\u304f\u3060\u3055\u308c\u3070\u3046\u308c\u3057\u3044\u3067\u3059\u3002<\/font><\/p>\n<style type=\"text\/css\">\n<!--\ntable {color: #000000; background-color: #e9e8e2; font-family: \u3086\u305f\u307d\u3093\uff08\u30b3\u30fc\u30c7\u30a3\u30f3\u30b0\uff09}\n-->\n<\/style>\n<table width=\"100%\">\n<tbody>\n<tr>\n<td align=\"left\">jp\\yucchi\\montecarlo_pi\\Montecarlo_PI.java<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<pre>\r\npackage jp.yucchi.montecarlo_pi;\r\n\r\nimport java.lang.management.ManagementFactory;\r\nimport java.util.ArrayList;\r\nimport java.util.List;\r\nimport java.util.concurrent.*;\r\nimport java.util.logging.Level;\r\nimport java.util.logging.Logger;\r\n\r\npublic class Montecarlo_PI implements Callable<List<Double>> {\r\n\r\n    public static void main(String[] args) {\r\n        double TOTAL_THREAD = 1_000_000.0;\r\n        int procs = ManagementFactory.getOperatingSystemMXBean().getAvailableProcessors();\r\n        ExecutorService executor = Executors.newFixedThreadPool(procs);\r\n        List<Future<List<Double>>> futures = new ArrayList<>();\r\n        for (double i = 0; i < TOTAL_THREAD; i++) {\r\n            futures.add(executor.submit(new Montecarlo_PI()));\r\n        }\r\n        executor.shutdown();\r\n        List<Double> mPi = new ArrayList<>();\r\n        for (Future<List<Double>> future : futures) {\r\n            try {\r\n                List<Double> pi = future.get();\r\n                mPi.addAll(pi);\r\n            } catch (InterruptedException | ExecutionException ex) {\r\n                Logger.getLogger(Montecarlo_PI.class.getName()).log(Level.SEVERE, null, ex);\r\n            }\r\n        }\r\n        double totalPi = 0.0;\r\n        for (Double pi : mPi) {\r\n            totalPi += pi;\r\n        }\r\n        double avgPi = totalPi \/ mPi.size();\r\n        System.out.println(\"\uff2d\uff41\uff54\uff48\u30af\u30e9\u30b9\u306b\u3088\u308b\u5186\u5468\u7387\u306f \" + Math.PI);\r\n        System.out.println(\"\u30e2\u30f3\u30c6\u30ab\u30eb\u30ed\u6cd5\u306b\u3088\u308b\u5186\u5468\u7387\u306f \" + avgPi);\r\n    }\r\n\r\n    @Override\r\n    public List<Double> call() throws Exception {\r\n        List<Double> pi = new ArrayList<>();\r\n        double hitCount = 0.0;\r\n        double NEEDLE = 100_000_000.0;\r\n        for (double i = 0; i < NEEDLE; i++) {\r\n            double x = Math.random();\r\n            double y = Math.random();\r\n            if (Math.pow(x, 2.0) + Math.pow(y, 2.0) < 1.0) {\r\n                hitCount++;\r\n            }\r\n        }\r\n        double _pi = 4.0 * hitCount \/ NEEDLE;\r\n        System.out.println(\"Montecarlo PI : \" + _pi);\r\n        pi.add(_pi);\r\n        return pi;\r\n    }\r\n}\r\n\r\n<\/pre>\n<p><font size=\"3\">\u4e00\u5104\u500b\u306e\u91dd\u3092\u843d\u3068\u3057\u3066\u8a08\u7b97\u3059\u308b\u51e6\u7406\u3092\u767e\u4e07\u56de\u3057\u3066\u5e73\u5747\u5024\u3092\u3068\u3063\u3066\u307f\u307e\u3057\u305f\u3002<\/font><\/p>\n<p><font size=\"3\">\u3063\u3066\u30fb\u30fb\u30fb\u8a08\u7b97\u51e6\u7406\u304c\u7d42\u308f\u3063\u3066\u306a\u3044(\uffe3\u3002\uffe3;)<\/font><\/p>\n<p><font size=\"3\">\u3057\u304b\u305f\u306a\u3044\u304b\u3089\u4e00\u5104\u500b\u306e\u91dd\u3092\u843d\u3068\u3059\u8a08\u7b97\u51e6\u7406\u3092\u5343\u56de\u306b\u5909\u66f4\u3057\u3066\u307f\u307e\u3057\u305f\u3002<\/font><\/p>\n<p><font size=\"3\">\u4e0a\u8a18\u306e\u30bd\u30fc\u30b9\u30b3\u30fc\u30c9\u306e NEEDLE \u306e\u5024\u3092 1000.0 \u306b\u5909\u66f4\u3057\u3066\u5b9f\u884c\u3057\u3066\u307f\u307e\u3057\u305f\u3002<\/font><\/p>\n<p><font size=\"3\">\u3053\u308c\u3067\u3082\u7d42\u308f\u308a\u305d\u3046\u306b\u306a\u3044\u304f\u3089\u3044\u6642\u9593\u304c\u304b\u304b\u308a\u307e\u3059\u3002<\/font><\/p>\n<p><font size=\"3\">\u4e0d\u672c\u610f\u3067\u3059\u304c\u8a08\u7b97\u51e6\u7406\u56de\u6570\u3092\uff13\uff12\u56de\u306b\u5909\u66f4\u3057\u307e\u3057\u305f\u3002(..;)<\/font><\/p>\n<p><font size=\"3\">\u5b9f\u884c\u7d50\u679c\u306f\u6b21\u306e\u3088\u3046\u306b\u306a\u308a\u307b\u3093\u306e\u6c17\u6301\u3061\u7a0b\u5ea6\u7cbe\u5ea6\u306f\u4e0a\u304c\u308a\u307e\u3057\u305f\u3002<\/font><\/p>\n<p>run:<br \/>Montecarlo PI : 3.14146332<br \/>Montecarlo PI : 3.1416326<br \/>Montecarlo PI : 3.1415482<br \/>Montecarlo PI : 3.141632<br \/>Montecarlo PI : 3.14127944<br \/>Montecarlo PI : 3.14178148<br \/>Montecarlo PI : 3.1416116<br \/>Montecarlo PI : 3.14141588<br \/>Montecarlo PI : 3.1416632<br \/>Montecarlo PI : 3.14117084<br \/>Montecarlo PI : 3.14161116<br \/>Montecarlo PI : 3.14168484<br \/>Montecarlo PI : 3.14166664<br \/>Montecarlo PI : 3.14151984<br \/>Montecarlo PI : 3.14131844<br \/>Montecarlo PI : 3.14161456<br \/>Montecarlo PI : 3.14160796<br \/>Montecarlo PI : 3.14157636<br \/>Montecarlo PI : 3.14174076<br \/>Montecarlo PI : 3.14137984<br \/>Montecarlo PI : 3.14161576<br \/>Montecarlo PI : 3.14160444<br \/>Montecarlo PI : 3.14165568<br \/>Montecarlo PI : 3.14140136<br \/>Montecarlo PI : 3.1414314<br \/>Montecarlo PI : 3.14134932<br \/>Montecarlo PI : 3.14164312<br \/>Montecarlo PI : 3.14159468<br \/>Montecarlo PI : 3.141492<br \/>Montecarlo PI : 3.14139636<br \/>Montecarlo PI : 3.14149788<br \/>Montecarlo PI : 3.1414862<br \/>\uff2d\uff41\uff54\uff48\u30af\u30e9\u30b9\u306b\u3088\u308b\u5186\u5468\u7387\u306f 3.141592653589793<br \/>\u30e2\u30f3\u30c6\u30ab\u30eb\u30ed\u6cd5\u306b\u3088\u308b\u5186\u5468\u7387\u306f 3.14153397375<br \/>\u69cb\u7bc9\u6210\u529f (\u5408\u8a08\u6642\u9593: 22 \u5206 47 \u79d2)<\/p>\n<p><font size=\"3\">\u6642\u9593\u306b\u4f59\u88d5\u306e\u3042\u308b\u3068\u304d\u306b\u8a08\u7b97\u51e6\u7406\u56de\u6570\u3092\u5897\u3084\u3057\u3066\u307f\u3066\u7d50\u679c\u3092\u78ba\u8a8d\u3057\u305f\u3044\u3068\u601d\u3044\u307e\u3059\u3002<\/font><\/p>\n<p><font size=\"3\">\u3061\u306a\u307f\u306b\u3053\u306e\u8a08\u7b97\u306f Intel Core i7-2600K (3.4GHz) \u306e CPU \u3092\u7a4d\u3093\u3060\u30cf\u30fc\u30c9\u30a6\u30a7\u30a2\u3067\u3057\u307e\u3057\u305f\u3002<\/font><\/p>\n<p><font size=\"3\">OS \u306f\u3001Windows 7 64bit \u7248\u3067\u3059\u3002<\/font><\/p>\n<p><font size=\"3\">Dual Xeon 4 Core (3.0GHz) \u306e\u30b7\u30b9\u30c6\u30e0\u3088\u308a\uff12\u500d\u304f\u3089\u3044\u901f\u3044\u3067\u3059\uff01<\/font><\/p>\n<p><font size=\"3\">\u30cf\u30a4\u30a8\u30f3\u30c9\u30de\u30b7\u30f3\u3092\u304a\u6301\u3061\u306e\u65b9\u306f\u662f\u975e\u8a66\u3057\u3066\u307f\u3066\u304f\u3060\u3055\u3044\u306d\u3002(\u0451_\u0451)<\/font><\/p>\n<p><font size=\"3\">\u5b9f\u884c\u7d50\u679c\u306e\u5408\u8a08\u6642\u9593: 22 \u5206 47 \u79d2\u3063\u3066\u306e\u306f\u4f7f\u7528\u3057\u305f NetBeans 7.2 \u958b\u767a\u7248\u3067\u306e\u5b9f\u884c\u6642\u306e\u5024\u3067\u3059\u3002<\/font><\/p>\n<p><a href=\"http:\/\/yucchi.jp\/blog\/wp-content\/uploads\/2012\/06\/NetBeans-7.2-DEV.png\" target=\"_blank\"><img loading=\"lazy\" decoding=\"async\" style=\"background-image: none; border-right-width: 0px; padding-left: 0px; padding-right: 0px; display: inline; border-top-width: 0px; border-bottom-width: 0px; border-left-width: 0px; padding-top: 0px\" title=\"NetBeans 7.2 DEV\" border=\"0\" alt=\"NetBeans 7.2 DEV\" src=\"http:\/\/yucchi.jp\/blog\/wp-content\/uploads\/2012\/06\/NetBeans-7.2-DEV_thumb.png\" width=\"428\" height=\"484\"><\/a><\/p>\n<div style=\"padding-bottom: 0px; margin: 0px; padding-left: 0px; padding-right: 0px; display: inline; float: none; padding-top: 0px\" id=\"scid:0767317B-992E-4b12-91E0-4F059A8CECA8:bb9c211e-5752-4191-984f-55be4423f3a6\" class=\"wlWriterEditableSmartContent\">Hatena \u30bf\u30b0: <a href=\"http:\/\/b.hatena.ne.jp\/t\/Java\" rel=\"tag\">Java<\/a><\/div>\n<p><font size=\"3\"><\/font><\/p>\n<div class='wp_social_bookmarking_light'>\n            <div class=\"wsbl_hatena\"><a href='\/\/b.hatena.ne.jp\/add?mode=confirm&url=http%3A%2F%2Fyucchi.jp%2Fblog%2F%3Fp%3D130&title=%E5%86%86%E5%91%A8%E7%8E%87%E3%82%92%E3%83%A2%E3%83%B3%E3%83%86%E3%82%AB%E3%83%AB%E3%83%AD%E6%B3%95%E3%81%A7%E6%B1%82%E3%82%81%E3%82%8B%20vol.2' title='\u3053\u306e\u30a8\u30f3\u30c8\u30ea\u30fc\u3092\u306f\u3066\u306a\u30d6\u30c3\u30af\u30de\u30fc\u30af\u306b\u8ffd\u52a0' rel=nofollow class='wp_social_bookmarking_light_a' target=_blank><img 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\u4e71\u6570\u30b7\u30e5\u30df\u30ec\u30fc\u30b7\u30e7\u30f3\u3068\u3057\u3066\u306f\u3001\u307e\u3041\u307e\u3041\u306e\u6570\u5024\u3092\u5c0e\u304d\u51fa\u3057\u3066\u3044\u308b\u3068\u500b\u4eba\u7684\u306b\u306f\u601d\u3063\u305f\u3002 \u3055\u3089\u306b\u7cbe\u5ea6\u3092\u4e0a\u3052\u3088\u3046\u3068\u3057\u3066\u4f55\u56de\u304b\u540c\u3058\u51e6\u7406\u3092\u3057\u3066\u5e73\u5747\u5024\u3092\u53d6\u308c\u3070\u3044\u3044\u304b\u306a\uff1f\u3068\u601d\u3044 \u6b21\u306e\u3088\u3046\u306b\u30d7\u30ed\u30b0\u30e9\u30e0\u3092\u5909\u66f4\u3057\u3066\u307f\u307e\u3057\u305f\u3002 \u306f\u3058\u3081\u306b\u4e8c\u91cd\u30eb\u30fc\u30d7\u3092\u4f7f\u3044\u5e73\u5747\u5024\u3092\u6c42\u3081\u308b\u30d7\u30ed\u30b0\u30e9\u30e0\u3092\u7d44\u3093\u3067\u3057\u307e\u3063\u3066 \u975e\u5e38\u306b\u52b9\u7387\u304c\u60aa\u3044\u3053\u3068\u306b\u6c17\u304c\u4ed8\u3044\u305f\u306e\u306f\u79d8\u5bc6\u3067\u3059\u3002(\uff1b\u00b4\u0414\uff40) \u76f8\u5909\u308f\u3089\u305a\u6c5a\u3044\u30b3\u30fc\u30c9\u3067\u3059\u304c\u7d20\u4eba\u306e\u3084\u308b\u3053\u3068\u3067\u3059\u304b\u3089\u30d7\u30ed\u30d5\u30a7\u30c3\u30b7\u30e7\u30ca\u30eb\u306a\u4eba\u306f \u512a\u3057\u304f\u89e3\u308a\u3084\u3059\u304f\u3054\u6307\u6458\u304f\u3060\u3055\u308c\u3070\u3046\u308c\u3057\u3044\u3067\u3059\u3002 jp\\yucchi\\montecarlo_pi\\Montecarlo_PI.java p\u2026<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[3],"tags":[17],"class_list":["post-130","post","type-post","status-publish","format-standard","hentry","category-java","tag-java"],"_links":{"self":[{"href":"http:\/\/yucchi.jp\/blog\/index.php?rest_route=\/wp\/v2\/posts\/130","targetHints":{"allow":["GET"]}}],"collection":[{"href":"http:\/\/yucchi.jp\/blog\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/yucchi.jp\/blog\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/yucchi.jp\/blog\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/yucchi.jp\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=130"}],"version-history":[{"count":3,"href":"http:\/\/yucchi.jp\/blog\/index.php?rest_route=\/wp\/v2\/posts\/130\/revisions"}],"predecessor-version":[{"id":839,"href":"http:\/\/yucchi.jp\/blog\/index.php?rest_route=\/wp\/v2\/posts\/130\/revisions\/839"}],"wp:attachment":[{"href":"http:\/\/yucchi.jp\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=130"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/yucchi.jp\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=130"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/yucchi.jp\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=130"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}