{"id":842,"date":"2022-12-20T11:54:25","date_gmt":"2022-08-29T21:44:11","guid":{"rendered":"https:\/\/www.silicloud.com\/ja\/blog\/index.php\/2023\/11\/30\/java%e3%81%ab%e3%81%8a%e3%81%91%e3%82%8b%e3%82%ac%e3%83%99%e3%83%bc%e3%82%b8%e3%82%b3%e3%83%ac%e3%82%af%e3%82%b7%e3%83%a7%e3%83%b3\/"},"modified":"2025-08-01T02:56:42","modified_gmt":"2025-07-31T17:56:42","slug":"java%e3%81%ab%e3%81%8a%e3%81%91%e3%82%8b%e3%82%ac%e3%83%99%e3%83%bc%e3%82%b8%e3%82%b3%e3%83%ac%e3%82%af%e3%82%b7%e3%83%a7%e3%83%b3","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/ja\/blog\/java%e3%81%ab%e3%81%8a%e3%81%91%e3%82%8b%e3%82%ac%e3%83%99%e3%83%bc%e3%82%b8%e3%82%b3%e3%83%ac%e3%82%af%e3%82%b7%e3%83%a7%e3%83%b3\/","title":{"rendered":"Java\u306b\u304a\u3051\u308b\u30ac\u30d9\u30fc\u30b8\u30b3\u30ec\u30af\u30b7\u30e7\u30f3"},"content":{"rendered":"<p>Java\u306e\u30ac\u30d9\u30fc\u30b8\u30b3\u30ec\u30af\u30b7\u30e7\u30f3\u306f\u9ad8\u5ea6\u306a\u30c8\u30d4\u30c3\u30af\u306e1\u3064\u3067\u3059\u3002Java\u306eGC\u77e5\u8b58\u306f\u3001\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u306e\u5b9f\u884c\u6642\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u3092\u5fae\u8abf\u6574\u3059\u308b\u306e\u306b\u5f79\u7acb\u3061\u307e\u3059\u3002<\/p>\n<h2>Java\u306b\u304a\u3051\u308b\u30ac\u30fc\u30d9\u30fc\u30b8\u30b3\u30ec\u30af\u30b7\u30e7\u30f3<\/h2>\n<ul class=\"post-ul\">\n<li>In Java, the programmers don\u2019t need to take care of destroying the objects that are out of use. The Garbage Collector takes care of it.<\/li>\n<li>Garbage Collector is a Daemon thread that keeps running in the background. Basically, it frees up the heap memory by destroying the unreachable objects.<\/li>\n<li>Unreachable objects are the ones that are no longer referenced by any part of the program.<\/li>\n<li>We can choose the garbage collector for our java program through JVM options, we will look into these in later section of this tutorial.<\/li>\n<\/ul>\n<h3>\u81ea\u52d5\u30b4\u30df\u53ce\u96c6\u306f\u3069\u306e\u3088\u3046\u306b\u6a5f\u80fd\u3059\u308b\u306e\u3067\u3057\u3087\u3046\u304b\uff1f<\/h3>\n<p>\u81ea\u52d5\u30ac\u30d9\u30fc\u30b8\u53ce\u96c6\u306f\u3001\u30d2\u30fc\u30d7\u30e1\u30e2\u30ea\u3092\u8abf\u3079\u3001\u5230\u9054\u4e0d\u80fd\u306a\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\uff08\u300c\u30de\u30fc\u30ad\u30f3\u30b0\u300d\u3068\u3082\u547c\u3070\u308c\u308b\uff09\u3092\u7279\u5b9a\u3057\u3001\u5727\u7e2e\u3057\u3066\u7834\u58ca\u3059\u308b\u30d7\u30ed\u30bb\u30b9\u3067\u3059\u3002\u3053\u306e\u30a2\u30d7\u30ed\u30fc\u30c1\u306e\u554f\u984c\u306f\u3001\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306e\u6570\u304c\u5897\u3048\u308b\u306b\u3064\u308c\u3066\u3001\u30ac\u30d9\u30fc\u30b8\u53ce\u96c6\u6642\u9593\u3082\u5897\u52a0\u3057\u7d9a\u3051\u308b\u3053\u3068\u3067\u3059\u3002\u306a\u305c\u306a\u3089\u3001\u5230\u9054\u4e0d\u80fd\u306a\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3092\u63a2\u3059\u305f\u3081\u306b\u3001\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306e\u30ea\u30b9\u30c8\u5168\u4f53\u3092\u691c\u7d22\u3059\u308b\u5fc5\u8981\u304c\u3042\u308b\u304b\u3089\u3067\u3059\u3002\u3057\u304b\u3057\u3001\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u306e\u7d4c\u9a13\u7684\u306a\u5206\u6790\u306b\u3088\u308c\u3070\u3001\u307b\u3068\u3093\u3069\u306e\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306f\u77ed\u547d\u3067\u3059\u3002\u3053\u306e\u52d5\u4f5c\u3092\u5229\u7528\u3057\u3066JVM\u306e\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u3092\u5411\u4e0a\u3055\u305b\u308b\u305f\u3081\u306b\u3001\u4e00\u822c\u7684\u306b\u306f\u300c\u4e16\u4ee3\u5225\u30ac\u30d9\u30fc\u30b8\u53ce\u96c6\u300d\u3068\u547c\u3070\u308c\u308b\u624b\u6cd5\u304c\u63a1\u7528\u3055\u308c\u307e\u3057\u305f\u3002\u3053\u306e\u65b9\u6cd5\u3067\u306f\u3001\u30d2\u30fc\u30d7\u30b9\u30da\u30fc\u30b9\u306fYoung Generation\u3001Old Generation\uff08\u307e\u305f\u306fTenured Generation\uff09\u3001Permanent Generation\u306e\u3088\u3046\u306b\u4e16\u4ee3\u306b\u5206\u5272\u3055\u308c\u307e\u3059\u3002Young Generation\u30d2\u30fc\u30d7\u30b9\u30da\u30fc\u30b9\u306f\u3001\u3059\u3079\u3066\u306e\u65b0\u3057\u3044\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u304c\u4f5c\u6210\u3055\u308c\u308b\u5834\u6240\u3067\u3059\u3002\u4e00\u5ea6\u6e80\u676f\u306b\u306a\u308b\u3068\u3001\u30de\u30a4\u30ca\u30fc\u30ac\u30d9\u30fc\u30b8\u53ce\u96c6\uff08\u307e\u305f\u306f\u30de\u30a4\u30ca\u30fcGC\uff09\u304c\u884c\u308f\u308c\u307e\u3059\u3002\u3053\u308c\u306f\u3001\u3053\u306e\u4e16\u4ee3\u306e\u3069\u306e\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u304c\u6b7b\u3093\u3067\u3044\u308b\u304b\u3092\u898b\u308b\u3068\u3001\u3053\u306e\u30d7\u30ed\u30bb\u30b9\u306f\u8fc5\u901f\u3067\u3059\u3002Young Generation\u3067\u751f\u304d\u6b8b\u3063\u305f\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306f\u5e74\u3092\u3068\u308a\u3001\u3084\u304c\u3066\u53e4\u3044\u4e16\u4ee3\u306b\u79fb\u52d5\u3057\u307e\u3059\u3002Old Generation\u306f\u3001\u9577\u671f\u306b\u308f\u305f\u3063\u3066\u751f\u304d\u6b8b\u308b\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3092\u4fdd\u5b58\u3059\u308b\u305f\u3081\u306b\u4f7f\u7528\u3055\u308c\u307e\u3059\u3002\u901a\u5e38\u3001Young Generation\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306b\u5bfe\u3057\u3066\u95be\u5024\u304c\u8a2d\u5b9a\u3055\u308c\u3001\u305d\u306e\u5e74\u9f62\u306b\u9054\u3059\u308b\u3068\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u304cOld Generation\u306b\u79fb\u52d5\u3057\u307e\u3059\u3002\u6700\u7d42\u7684\u306b\u306f\u3001Old Generation\u3082\u53ce\u96c6\u3059\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002\u3053\u306e\u30a4\u30d9\u30f3\u30c8\u306f\u30e1\u30b8\u30e3\u30fc\u30ac\u30d9\u30fc\u30b8\u53ce\u96c6\uff08Major GC\uff09\u3068\u547c\u3070\u308c\u307e\u3059\u3002\u901a\u5e38\u3001\u3053\u308c\u306f\u5168\u3066\u306e\u751f\u304d\u3066\u3044\u308b\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3092\u5bfe\u8c61\u306b\u3059\u308b\u305f\u3081\u3001\u306f\u308b\u304b\u306b\u9045\u304f\u306a\u308a\u307e\u3059\u3002\u307e\u305f\u3001Young Generation\u3068Old Generation\u306e\u30b9\u30da\u30fc\u30b9\u306e\u4e21\u65b9\u3092\u30af\u30ea\u30fc\u30cb\u30f3\u30b0\u3059\u308b\u30d5\u30ebGC\u3082\u3042\u308a\u307e\u3059\u3002\u6700\u5f8c\u306b\u3001Java 8\u3067\u306fJava 7\u307e\u3067Permanent Generation\uff08\u307e\u305f\u306fPerm Gen\uff09\u304c\u5b58\u5728\u3057\u307e\u3057\u305f\u3002\u3053\u308c\u306f\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u3067\u4f7f\u7528\u3055\u308c\u308b\u30af\u30e9\u30b9\u3068\u30e1\u30bd\u30c3\u30c9\u3092\u8aac\u660e\u3059\u308b\u305f\u3081\u306bJVM\u304c\u5fc5\u8981\u3068\u3059\u308b\u30e1\u30bf\u30c7\u30fc\u30bf\u3092\u542b\u3093\u3067\u3044\u307e\u3057\u305f\u304c\u3001Java 8\u3067\u524a\u9664\u3055\u308c\u307e\u3057\u305f\u3002<\/p>\n<h3>Java\u306e\u30ac\u30d9\u30fc\u30b8\u30b3\u30ec\u30af\u30bf\u30fc<\/h3>\n<p>\u5b9f\u969b\u306b\u306f\u3001JVM\u306f4\u3064\u306e\u7570\u306a\u308b\u30ac\u30d9\u30fc\u30b8\u30b3\u30ec\u30af\u30bf\u30fc\u3092\u63d0\u4f9b\u3057\u3066\u3044\u307e\u3059\u304c\u3001\u3059\u3079\u3066\u304c\u4e16\u4ee3\u5225\u3067\u3059\u3002\u305d\u308c\u305e\u308c\u306b\u72ec\u81ea\u306e\u5229\u70b9\u3068\u6b20\u70b9\u304c\u3042\u308a\u307e\u3059\u3002\u3069\u306e\u30ac\u30d9\u30fc\u30b8\u30b3\u30ec\u30af\u30bf\u30fc\u3092\u4f7f\u7528\u3059\u308b\u304b\u306e\u9078\u629e\u306f\u79c1\u305f\u3061\u306b\u59d4\u306d\u3089\u308c\u3066\u304a\u308a\u3001\u30b9\u30eb\u30fc\u30d7\u30c3\u30c8\u3084\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u306e\u505c\u6b62\u6642\u9593\u306b\u306f\u5287\u7684\u306a\u9055\u3044\u304c\u3042\u308a\u307e\u3059\u3002\u3053\u308c\u306b\u3088\u308a\u3001\u7ba1\u7406\u3055\u308c\u305f\u30d2\u30fc\u30d7\u306f\u7570\u306a\u308b\u30bb\u30b0\u30e1\u30f3\u30c8\u306b\u5206\u5272\u3055\u308c\u3001\u53e4\u304f\u304b\u3089\u306e\u4eee\u5b9a\u306b\u57fa\u3065\u3044\u3066\u30d2\u30fc\u30d7\u5185\u306e\u307b\u3068\u3093\u3069\u306e\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306f\u77ed\u547d\u3067\u3042\u308a\u3001\u7d20\u65e9\u304f\u518d\u5229\u7528\u3055\u308c\u308b\u3079\u304d\u3067\u3059\u3002\u3057\u305f\u304c\u3063\u3066\u30014\u3064\u306e\u30ac\u30d9\u30fc\u30b8\u30b3\u30ec\u30af\u30bf\u30fc\u306e\u30bf\u30a4\u30d7\u306f\u6b21\u306e\u901a\u308a\u3067\u3059\uff1a<\/p>\n<h3>\u30b7\u30ea\u30a2\u30ebGC<\/h3>\n<p>\u3053\u308c\u306f\u3001\u30b7\u30f3\u30b0\u30eb\u30b9\u30ec\u30c3\u30c9\u30b7\u30b9\u30c6\u30e0\u3068\u5c0f\u3055\u306a\u30d2\u30fc\u30d7\u30b5\u30a4\u30ba\u5411\u3051\u306b\u8a2d\u8a08\u3055\u308c\u305f\u3001\u6700\u3082\u30b7\u30f3\u30d7\u30eb\u306a\u30ac\u30d9\u30fc\u30b8\u30b3\u30ec\u30af\u30bf\u3067\u3059\u3002\u4f5c\u696d\u4e2d\u306f\u3059\u3079\u3066\u306e\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u304c\u51cd\u7d50\u3055\u308c\u307e\u3059\u3002-XX:+UseSerialGC JVM\u30aa\u30d7\u30b7\u30e7\u30f3\u3092\u4f7f\u7528\u3057\u3066\u30aa\u30f3\u306b\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n<h3>\u4e26\u884c\/\u30b9\u30eb\u30fc\u30d7\u30c3\u30c8 GC<\/h3>\n<p>\u3053\u308c\u306fJDK 8\u306eJVM\u306e\u30c7\u30d5\u30a9\u30eb\u30c8\u306e\u30b3\u30ec\u30af\u30bf\u3067\u3059\u3002\u305d\u306e\u540d\u524d\u304c\u793a\u3059\u3088\u3046\u306b\u3001\u8907\u6570\u306e\u30b9\u30ec\u30c3\u30c9\u3092\u4f7f\u7528\u3057\u3066\u30d2\u30fc\u30d7\u9818\u57df\u3092\u30b9\u30ad\u30e3\u30f3\u3057\u3001\u30b3\u30f3\u30d1\u30af\u30b7\u30e7\u30f3\u3092\u884c\u3044\u307e\u3059\u3002\u3053\u306e\u30b3\u30ec\u30af\u30bf\u306e\u6b20\u70b9\u306f\u3001\u30de\u30a4\u30ca\u30fc\u30b3\u30ec\u30af\u30b7\u30e7\u30f3\u3084\u30d5\u30ebGC\u3092\u5b9f\u884c\u3059\u308b\u969b\u306b\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u30b9\u30ec\u30c3\u30c9\u3092\u4e00\u6642\u505c\u6b62\u3055\u305b\u308b\u3053\u3068\u3067\u3059\u3002\u3053\u306e\u30b3\u30ec\u30af\u30bf\u306f\u3001\u305d\u306e\u3088\u3046\u306a\u4e00\u6642\u505c\u6b62\u3092\u51e6\u7406\u3067\u304d\u308b\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u306b\u6700\u9069\u3067\u3042\u308a\u3001\u30b3\u30ec\u30af\u30bf\u306b\u3088\u3063\u3066\u5f15\u304d\u8d77\u3053\u3055\u308c\u308bCPU\u30aa\u30fc\u30d0\u30fc\u30d8\u30c3\u30c9\u3092\u6700\u9069\u5316\u3057\u3088\u3046\u3068\u3059\u308b\u5834\u5408\u306b\u9069\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n<h3>CMS\u30b3\u30ec\u30af\u30bf\u30fc<\/h3>\n<p>CMS\u30ac\u30d9\u30fc\u30b8\u30b3\u30ec\u30af\u30bf\uff08&#8221;concurrent-mark-sweep&#8221;\uff09\u30a2\u30eb\u30b4\u30ea\u30ba\u30e0\u306f\u3001\u672a\u4f7f\u7528\u306e\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3092\u518d\u5229\u7528\u3059\u308b\u305f\u3081\u306b\u30d2\u30fc\u30d7\u3092\u30b9\u30ad\u30e3\u30f3\u3059\u308b\u305f\u3081\u306b\u8907\u6570\u306e\u30b9\u30ec\u30c3\u30c9\uff08&#8221;concurrent&#8221;\uff09\u3092\u4f7f\u7528\u3057\u307e\u3059\u3002\u3053\u306e\u30b3\u30ec\u30af\u30bf\u306f\u30012\u3064\u306e\u30b1\u30fc\u30b9\u3067\u505c\u6b62-\u30b6-\u30ef\u30fc\u30eb\u30c9\uff08STW\uff09\u30e2\u30fc\u30c9\u306b\u5165\u308a\u307e\u3059\uff1a-\u30eb\u30fc\u30c8\u306e\u521d\u671f\u30de\u30fc\u30ad\u30f3\u30b0\uff08\u3064\u307e\u308a\u3001\u30b9\u30ec\u30c3\u30c9\u306e\u5165\u308a\u53e3\u3084\u9759\u7684\u5909\u6570\u304b\u3089\u5230\u9054\u53ef\u80fd\u306a\u65e7\u4e16\u4ee3\u306e\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306e\u521d\u671f\u30de\u30fc\u30ad\u30f3\u30b0\u3092\u884c\u3046\u969b\uff09-\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u304c\u30a2\u30eb\u30b4\u30ea\u30ba\u30e0\u304c\u4e26\u884c\u3057\u3066\u5b9f\u884c\u3055\u308c\u3066\u3044\u308b\u9593\u306b\u30d2\u30fc\u30d7\u306e\u72b6\u614b\u3092\u5909\u66f4\u3057\u3001\u6b63\u3057\u3044\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u304c\u30de\u30fc\u30af\u3055\u308c\u308b\u3088\u3046\u306b\u6700\u7d42\u7684\u306a\u51e6\u7406\u3092\u884c\u3046\u5fc5\u8981\u304c\u3042\u308b\u5834\u5408\u3002\u3053\u306e\u30b3\u30ec\u30af\u30bf\u306f\u30d7\u30ed\u30e2\u30fc\u30b7\u30e7\u30f3\u306e\u5931\u6557\u306b\u76f4\u9762\u3059\u308b\u53ef\u80fd\u6027\u304c\u3042\u308a\u307e\u3059\u3002\u82e5\u3044\u4e16\u4ee3\u304b\u3089\u65e7\u4e16\u4ee3\u306b\u79fb\u52d5\u3059\u308b\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u304c\u3042\u308a\u3001\u30b3\u30ec\u30af\u30bf\u304c\u65e7\u4e16\u4ee3\u306e\u30b9\u30da\u30fc\u30b9\u3092\u78ba\u4fdd\u3059\u308b\u305f\u3081\u306e\u5341\u5206\u306a\u6642\u9593\u3092\u6301\u3063\u3066\u3044\u306a\u3044\u5834\u5408\u3001\u30d7\u30ed\u30e2\u30fc\u30b7\u30e7\u30f3\u306e\u5931\u6557\u304c\u767a\u751f\u3057\u307e\u3059\u3002\u3053\u308c\u3092\u9632\u3050\u305f\u3081\u306b\u306f\u3001\u65e7\u4e16\u4ee3\u3078\u306e\u3088\u308a\u591a\u304f\u306e\u30d2\u30fc\u30d7\u30b5\u30a4\u30ba\u3092\u63d0\u4f9b\u3059\u308b\u304b\u3001\u30b3\u30ec\u30af\u30bf\u306b\u3088\u308a\u591a\u304f\u306e\u30d0\u30c3\u30af\u30b0\u30e9\u30a6\u30f3\u30c9\u30b9\u30ec\u30c3\u30c9\u3092\u63d0\u4f9b\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n<h3>G1\u30b3\u30ec\u30af\u30bf\u30fc<\/h3>\n<div><img decoding=\"async\" class=\"post-images\" title=\"\" src=\"https:\/\/cdn.silicloud.com\/blog-img\/blog\/img\/65648d48daa94e2bdf7bce42\/14-0.png\" alt=\"garbage collection in java, Java GC\" \/><\/div>\n<ol>\n<li style=\"list-style-type: none;\">\n<ol>\u82e5\u5e74\u4e16\u4ee3\u306e\u307f\u306e\u30d5\u30a7\u30fc\u30ba\uff1a\u3053\u306e\u30d5\u30a7\u30fc\u30ba\u3067\u306f\u3001\u82e5\u5e74\u4e16\u4ee3\u306e\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306e\u307f\u3092\u542b\u307f\u3001\u305d\u308c\u3089\u3092\u8001\u5e74\u4e16\u4ee3\u306b\u6607\u683c\u3055\u305b\u307e\u3059\u3002\u82e5\u5e74\u4e16\u4ee3\u306e\u307f\u306e\u30d5\u30a7\u30fc\u30ba\u3068\u7a7a\u9593\u56de\u53ce\u30d5\u30a7\u30fc\u30ba\u306e\u9077\u79fb\u306f\u3001\u8001\u5e74\u4e16\u4ee3\u304c\u4e00\u5b9a\u306e\u95be\u5024\u3067\u5360\u6709\u3055\u308c\u308b\u3068\u304d\u306b\u958b\u59cb\u3055\u308c\u307e\u3059\u3002\u3053\u306e\u6642\u3001G1\u306f\u901a\u5e38\u306e\u82e5\u5e74\u4e16\u4ee3\u306e\u30b3\u30ec\u30af\u30b7\u30e7\u30f3\u3067\u306f\u306a\u304f\u3001\u521d\u671f\u30de\u30fc\u30af\u306e\u82e5\u5e74\u4e16\u4ee3\u30b3\u30ec\u30af\u30b7\u30e7\u30f3\u3092\u30b9\u30b1\u30b8\u30e5\u30fc\u30eb\u3057\u307e\u3059\u3002<\/ol>\n<\/li>\n<\/ol>\n<p>\u521d\u671f\u30de\u30fc\u30ad\u30f3\u30b0\uff1a\u3053\u306e\u30bf\u30a4\u30d7\u306e\u30b3\u30ec\u30af\u30b7\u30e7\u30f3\u306f\u3001\u901a\u5e38\u306e\u82e5\u5e74\u4e16\u4ee3\u306e\u30b3\u30ec\u30af\u30b7\u30e7\u30f3\u306b\u52a0\u3048\u3066\u30de\u30fc\u30ad\u30f3\u30b0\u30d7\u30ed\u30bb\u30b9\u3092\u958b\u59cb\u3057\u307e\u3059\u3002\u4e26\u884c\u30de\u30fc\u30ad\u30f3\u30b0\u306b\u3088\u308a\u3001\u8001\u5e74\u4e16\u4ee3\u9818\u57df\u306e\u73fe\u5728\u306e\u751f\u5b58\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u304c\u6c7a\u5b9a\u3055\u308c\u3001\u6b21\u306e\u7a7a\u9593\u56de\u53ce\u30d5\u30a7\u30fc\u30ba\u3067\u4fdd\u6301\u3055\u308c\u307e\u3059\u3002\u30de\u30fc\u30ad\u30f3\u30b0\u304c\u5b8c\u5168\u306b\u7d42\u4e86\u3059\u308b\u524d\u306b\u3001\u901a\u5e38\u306e\u82e5\u5e74\u4e16\u4ee3\u306e\u30b3\u30ec\u30af\u30b7\u30e7\u30f3\u304c\u767a\u751f\u3059\u308b\u3053\u3068\u304c\u3042\u308a\u307e\u3059\u3002\u30de\u30fc\u30ad\u30f3\u30b0\u306f\u3001Remark\u3068Cleanup\u306e2\u3064\u306e\u7279\u5225\u306a\u30b9\u30c8\u30c3\u30d7\u30fb\u30b6\u30fb\u30ef\u30fc\u30eb\u30c9\u306e\u4e00\u6642\u505c\u6b62\u3067\u7d42\u4e86\u3057\u307e\u3059\u3002<\/p>\n<p>Remark\uff1a\u3053\u306e\u4e00\u6642\u505c\u6b62\u306f\u3001\u30de\u30fc\u30ad\u30f3\u30b0\u81ea\u4f53\u3092\u7d42\u4e86\u3057\u3001\u30b0\u30ed\u30fc\u30d0\u30eb\u306a\u53c2\u7167\u306e\u51e6\u7406\u3068\u30af\u30e9\u30b9\u306e\u30a2\u30f3\u30ed\u30fc\u30c9\u3092\u884c\u3044\u307e\u3059\u3002Remark\u3068Cleanup\u306e\u9593\u3067\u3001G1\u306f\u4e26\u884c\u3057\u3066\u751f\u5b58\u60c5\u5831\u306e\u8981\u7d04\u3092\u8a08\u7b97\u3057\u3001\u3053\u308c\u304cCleanup\u306e\u4e00\u6642\u505c\u6b62\u3067\u6700\u7d42\u5316\u3055\u308c\u3066\u5185\u90e8\u30c7\u30fc\u30bf\u69cb\u9020\u306e\u66f4\u65b0\u306b\u4f7f\u7528\u3055\u308c\u307e\u3059\u3002<\/p>\n<p>Cleanup\uff1a\u3053\u306e\u4e00\u6642\u505c\u6b62\u3067\u306f\u3001\u5b8c\u5168\u306b\u7a7a\u306e\u9818\u57df\u3082\u51e6\u7406\u3057\u3001\u5b9f\u969b\u306b\u7a7a\u9593\u56de\u53ce\u30d5\u30a7\u30fc\u30ba\u304c\u7d9a\u304f\u304b\u3069\u3046\u304b\u3092\u5224\u65ad\u3057\u307e\u3059\u3002\u7a7a\u9593\u56de\u53ce\u30d5\u30a7\u30fc\u30ba\u304c\u7d9a\u304f\u5834\u5408\u3001\u82e5\u5e74\u4e16\u4ee3\u306e\u307f\u306e\u30d5\u30a7\u30fc\u30ba\u306f\u5358\u4e00\u306e\u82e5\u5e74\u4e16\u4ee3\u306e\u30b3\u30ec\u30af\u30b7\u30e7\u30f3\u3067\u7d42\u4e86\u3057\u307e\u3059\u3002<\/p>\n<p>\u7a7a\u9593\u56de\u53ce\u30d5\u30a7\u30fc\u30ba\uff1a\u3053\u306e\u30d5\u30a7\u30fc\u30ba\u306f\u3001\u8907\u6570\u306e\u30df\u30c3\u30af\u30b9\u30c9\u30b3\u30ec\u30af\u30b7\u30e7\u30f3\u3067\u69cb\u6210\u3055\u308c\u307e\u3059\u3002\u82e5\u5e74\u4e16\u4ee3\u9818\u57df\u306b\u52a0\u3048\u3066\u3001\u8001\u5e74\u4e16\u4ee3\u9818\u57df\u306e\u751f\u5b58\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3082\u79fb\u52d5\u3057\u307e\u3059\u3002\u7a7a\u9593\u56de\u53ce\u30d5\u30a7\u30fc\u30ba\u306f\u3001G1\u304c\u3055\u3089\u306b\u8001\u5e74\u4e16\u4ee3\u9818\u57df\u3092\u79fb\u52d5\u3057\u3066\u3082\u5341\u5206\u306a\u7a7a\u304d\u9818\u57df\u304c\u5f97\u3089\u308c\u306a\u3044\u3068\u5224\u65ad\u3059\u308b\u307e\u3067\u7d9a\u304d\u307e\u3059\u3002<\/p>\n<p>G1\u306f\u3001-XX:+UseG1GC\u30d5\u30e9\u30b0\u3092\u4f7f\u7528\u3057\u3066\u6709\u52b9\u306b\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002\u3053\u306e\u6226\u7565\u306b\u3088\u308a\u3001\u30d0\u30c3\u30af\u30b0\u30e9\u30a6\u30f3\u30c9\u30b9\u30ec\u30c3\u30c9\u304c\u5230\u9054\u4e0d\u53ef\u80fd\u306a\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3092\u30b9\u30ad\u30e3\u30f3\u3092\u7d42\u3048\u308b\u524d\u306b\u30d2\u30fc\u30d7\u304c\u67af\u6e07\u3059\u308b\u53ef\u80fd\u6027\u304c\u6e1b\u308a\u307e\u3059\u3002\u307e\u305f\u3001G1\u306f\u30d2\u30fc\u30d7\u3092\u9010\u6b21\u30b3\u30f3\u30d1\u30af\u30c8\u5316\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u304c\u3001CMS\u30b3\u30ec\u30af\u30bf\u306fSTW\u30e2\u30fc\u30c9\u3067\u306e\u307f\u5b9f\u884c\u3067\u304d\u307e\u3059\u3002Java 8\u3067\u306f\u3001G1\u30b3\u30ec\u30af\u30bf\u306b\u3088\u308b\u7f8e\u3057\u3044\u6700\u9069\u5316\u304c\u63d0\u4f9b\u3055\u308c\u3066\u304a\u308a\u3001\u30b9\u30c8\u30ea\u30f3\u30b0\u306e\u91cd\u8907\u6392\u9664\u3068\u547c\u3070\u308c\u3066\u3044\u307e\u3059\u3002\u79c1\u305f\u3061\u306e\u30b9\u30c8\u30ea\u30f3\u30b0\u3092\u8868\u3059\u6587\u5b57\u914d\u5217\u306f\u3001\u30d2\u30fc\u30d7\u30b9\u30da\u30fc\u30b9\u306e\u5927\u90e8\u5206\u3092\u5360\u6709\u3057\u3066\u3044\u308b\u3053\u3068\u304c\u308f\u304b\u3063\u3066\u3044\u307e\u3059\u3002\u65b0\u3057\u3044\u6700\u9069\u5316\u3067\u306f\u3001G1\u30b3\u30ec\u30af\u30bf\u304c\u30d2\u30fc\u30d7\u5168\u4f53\u3067\u8907\u6570\u56de\u8907\u88fd\u3055\u308c\u3066\u3044\u308b\u6587\u5b57\u5217\u3092\u7279\u5b9a\u3057\u3001\u305d\u308c\u3089\u3092\u540c\u3058\u5185\u90e8char[]\u914d\u5217\u3092\u6307\u3059\u3088\u3046\u306b\u5909\u66f4\u3059\u308b\u3053\u3068\u3067\u3001\u30d2\u30fc\u30d7\u306b\u540c\u3058\u6587\u5b57\u5217\u306e\u8907\u6570\u306e\u30b3\u30d4\u30fc\u304c\u4e0d\u5fc5\u8981\u306b\u5b58\u5728\u3059\u308b\u306e\u3092\u907f\u3051\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002\u3053\u306e\u6700\u9069\u5316\u3092\u6709\u52b9\u306b\u3059\u308b\u306b\u306f\u3001-XX:+UseStringDeduplication JVM\u5f15\u6570\u3092\u4f7f\u7528\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002G1\u306fJDK 9\u3067\u30c7\u30d5\u30a9\u30eb\u30c8\u306e\u30ac\u30d9\u30fc\u30b8\u30b3\u30ec\u30af\u30bf\u3067\u3059\u3002<\/p>\n<h3>Java 8 \u306e PermGen \u3068 Metaspace<\/h3>\n<p>Java 8\u3067\u306f\u3001Permanent Generation\u30b9\u30da\u30fc\u30b9\u304c\u524a\u9664\u3055\u308c\u305f\u305f\u3081\u3001JDK 8 HotSpot JVM\u3067\u306f\u30af\u30e9\u30b9\u306e\u30e1\u30bf\u30c7\u30fc\u30bf\u306e\u8868\u73fe\u306b\u30cd\u30a4\u30c6\u30a3\u30d6\u30e1\u30e2\u30ea\u304c\u4f7f\u7528\u3055\u308c\u308b\u3088\u3046\u306b\u306a\u308a\u307e\u3057\u305f\u3002\u3053\u308c\u3092Metaspace\u3068\u547c\u3073\u307e\u3059\u3002\u30af\u30e9\u30b9\u306e\u30e1\u30bf\u30c7\u30fc\u30bf\u306e\u307b\u3068\u3093\u3069\u306e\u5272\u308a\u5f53\u3066\u306f\u30cd\u30a4\u30c6\u30a3\u30d6\u30e1\u30e2\u30ea\u304b\u3089\u884c\u308f\u308c\u307e\u3059\u3002\u307e\u305f\u3001\u30af\u30e9\u30b9\u306e\u30e1\u30bf\u30c7\u30fc\u30bf\u306b\u4f7f\u7528\u3059\u308b\u30e1\u30e2\u30ea\u91cf\u3092\u5236\u9650\u3059\u308b\u305f\u3081\u306b\u3001MaxMetaspaceSize\u3068\u3044\u3046\u65b0\u3057\u3044\u30d5\u30e9\u30b0\u304c\u8ffd\u52a0\u3055\u308c\u307e\u3057\u305f\u3002\u3053\u308c\u3092\u6307\u5b9a\u3057\u306a\u3044\u5834\u5408\u3001\u5b9f\u884c\u4e2d\u306e\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u306e\u9700\u8981\u306b\u5fdc\u3058\u3066Metaspace\u304c\u52d5\u7684\u306b\u30ea\u30b5\u30a4\u30ba\u3055\u308c\u307e\u3059\u3002\u30af\u30e9\u30b9\u306e\u30e1\u30bf\u30c7\u30fc\u30bf\u306e\u4f7f\u7528\u91cf\u304cMaxMetaspaceSize\u306e\u5236\u9650\u306b\u9054\u3059\u308b\u3068\u3001Metaspace\u306e\u30ac\u30d9\u30fc\u30b8\u30b3\u30ec\u30af\u30b7\u30e7\u30f3\u304c\u30c8\u30ea\u30ac\u30fc\u3055\u308c\u307e\u3059\u3002Metaspace\u306e\u30ac\u30d9\u30fc\u30b8\u30b3\u30ec\u30af\u30b7\u30e7\u30f3\u304c\u904e\u5270\u306b\u884c\u308f\u308c\u308b\u5834\u5408\u3001\u30af\u30e9\u30b9\u3084\u30af\u30e9\u30b9\u30ed\u30fc\u30c0\u30fc\u306e\u30e1\u30e2\u30ea\u30ea\u30fc\u30af\u3084\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u306e\u9069\u5207\u306a\u30b5\u30a4\u30ba\u6307\u5b9a\u306e\u554f\u984c\u306e\u75c7\u72b6\u3068\u8a00\u3048\u307e\u3059\u3002\u3053\u308c\u3067Java\u306b\u304a\u3051\u308b\u30ac\u30d9\u30fc\u30b8\u30b3\u30ec\u30af\u30b7\u30e7\u30f3\u306b\u3064\u3044\u3066\u306e\u8aac\u660e\u306f\u7d42\u308f\u308a\u3067\u3059\u3002Java\u306b\u306f\u3055\u307e\u3056\u307e\u306a\u30ac\u30d9\u30fc\u30b8\u30b3\u30ec\u30af\u30bf\u30fc\u304c\u5b58\u5728\u3059\u308b\u3053\u3068\u306b\u3064\u3044\u3066\u3001\u7406\u89e3\u3057\u3066\u3044\u305f\u3060\u3051\u305f\u3068\u601d\u3044\u307e\u3059\u3002\u53c2\u8003\u6587\u732e\uff1aOracle\u30c9\u30ad\u30e5\u30e1\u30f3\u30c6\u30fc\u30b7\u30e7\u30f3\u3001G1 GC\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Java\u306e\u30ac\u30d9\u30fc\u30b8\u30b3\u30ec\u30af\u30b7\u30e7\u30f3\u306f\u9ad8\u5ea6\u306a\u30c8\u30d4\u30c3\u30af\u306e1\u3064\u3067\u3059\u3002Java\u306eGC\u77e5\u8b58\u306f\u3001\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u306e\u5b9f\u884c\u6642\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u3092\u5fae\u8abf\u6574\u3059\u308b\u306e\u306b\u5f79\u7acb\u3061\u307e\u3059\u3002 Java\u306b\u304a\u3051\u308b\u30ac\u30fc\u30d9\u30fc\u30b8\u30b3\u30ec\u30af\u30b7\u30e7\u30f3 In Java, the pro [&hellip;]<\/p>\n","protected":false},"author":9,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[26,61],"class_list":["post-842","post","type-post","status-publish","format-standard","hentry","category-uncategorized","tag-26","tag-61"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v21.5 (Yoast 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