{"id":2909,"date":"2023-07-14T13:56:24","date_gmt":"2023-07-14T05:56:24","guid":{"rendered":"https:\/\/xinchewhd.com.cn\/?p=2909"},"modified":"2023-07-14T17:44:22","modified_gmt":"2023-07-14T09:44:22","slug":"%e3%80%90jvm%e7%ac%94%e8%ae%b0%e3%80%91g1%e5%9b%9e%e6%94%b6%e5%99%a8%e5%9e%83%e5%9c%be%e5%9b%9e%e6%94%b6%e8%bf%87%e7%a8%8b","status":"publish","type":"post","link":"https:\/\/xinchewhd.com.cn\/index.php\/jvm\/%e3%80%90jvm%e7%ac%94%e8%ae%b0%e3%80%91g1%e5%9b%9e%e6%94%b6%e5%99%a8%e5%9e%83%e5%9c%be%e5%9b%9e%e6%94%b6%e8%bf%87%e7%a8%8b\/","title":{"rendered":"\u3010JVM\u7b14\u8bb0\u3011G1\u56de\u6536\u5668\u5783\u573e\u56de\u6536\u8fc7\u7a0b"},"content":{"rendered":"<link rel=\"stylesheet\" href=\"https:\/\/csdnimg.cn\/release\/blogv2\/dist\/mdeditor\/css\/editerView\/kdoc_html_views-1a98987dfd.css\">\n<link rel=\"stylesheet\" href=\"https:\/\/csdnimg.cn\/release\/blogv2\/dist\/mdeditor\/css\/editerView\/ck_htmledit_views-25cebea3f9.css\">\n<div id=\"content_views\" class=\"htmledit_views\">\n<p id=\"main-toc\"><strong>\u76ee\u5f55<\/strong><\/p>\n<p id=\"-toc\" style=\"margin-left:0px;\">\n<p id=\"%E5%88%86%E5%8C%BARegion%EF%BC%9A%E5%8C%96%E6%95%B4%E4%B8%BA%E9%9B%B6-toc\" style=\"margin-left:0px;\"><a href=\"#%E5%88%86%E5%8C%BARegion%EF%BC%9A%E5%8C%96%E6%95%B4%E4%B8%BA%E9%9B%B6\" target=\"_blank\"  rel=\"nofollow\" >\u5206\u533aRegion\uff1a\u5316\u6574\u4e3a\u96f6<\/a><\/p>\n<p id=\"%E8%AE%BE%E7%BD%AEH%E7%9A%84%E5%8E%9F%E5%9B%A0-toc\" style=\"margin-left:40px;\"><a href=\"#%E8%AE%BE%E7%BD%AEH%E7%9A%84%E5%8E%9F%E5%9B%A0\" target=\"_blank\"  rel=\"nofollow\" >\u8bbe\u7f6eH\u7684\u539f\u56e0<\/a><\/p>\n<p id=\"G1%E5%9B%9E%E6%94%B6%E5%99%A8%E5%9E%83%E5%9C%BE%E5%9B%9E%E6%94%B6%E8%BF%87%E7%A8%8B-toc\" style=\"margin-left:0px;\"><a href=\"#G1%E5%9B%9E%E6%94%B6%E5%99%A8%E5%9E%83%E5%9C%BE%E5%9B%9E%E6%94%B6%E8%BF%87%E7%A8%8B\" target=\"_blank\"  rel=\"nofollow\" >G1\u56de\u6536\u5668\u5783\u573e\u56de\u6536\u8fc7\u7a0b<\/a><\/p>\n<p id=\"Remembered%20Set-toc\" style=\"margin-left:40px;\"><a href=\"#Remembered%20Set\" target=\"_blank\"  rel=\"nofollow\" >Remembered Set<\/a><\/p>\n<p id=\"%E8%BF%87%E7%A8%8B%E4%B8%80%EF%BC%9A%E5%B9%B4%E8%BD%BB%E4%BB%A3GC-toc\" style=\"margin-left:40px;\"><a href=\"#%E8%BF%87%E7%A8%8B%E4%B8%80%EF%BC%9A%E5%B9%B4%E8%BD%BB%E4%BB%A3GC\" target=\"_blank\"  rel=\"nofollow\" >\u8fc7\u7a0b\u4e00\uff1a\u5e74\u8f7b\u4ee3GC<\/a><\/p>\n<p id=\"%E8%BF%87%E7%A8%8B%E4%BA%8C%EF%BC%9A%E5%B9%B6%E5%8F%91%E6%A0%87%E8%AE%B0%E8%BF%87%E7%A8%8B-toc\" style=\"margin-left:40px;\"><a href=\"#%E8%BF%87%E7%A8%8B%E4%BA%8C%EF%BC%9A%E5%B9%B6%E5%8F%91%E6%A0%87%E8%AE%B0%E8%BF%87%E7%A8%8B\" target=\"_blank\"  rel=\"nofollow\" >\u8fc7\u7a0b\u4e8c\uff1a\u5e76\u53d1\u6807\u8bb0\u8fc7\u7a0b<\/a><\/p>\n<p id=\"%E8%BF%87%E7%A8%8B%E4%B8%89%EF%BC%9A%E6%B7%B7%E5%90%88%E5%9B%9E%E6%94%B6-toc\" style=\"margin-left:40px;\"><a href=\"#%E8%BF%87%E7%A8%8B%E4%B8%89%EF%BC%9A%E6%B7%B7%E5%90%88%E5%9B%9E%E6%94%B6\" target=\"_blank\"  rel=\"nofollow\" >\u8fc7\u7a0b\u4e09\uff1a\u6df7\u5408\u56de\u6536<\/a><\/p>\n<p id=\"%E8%BF%87%E7%A8%8B%E5%9B%9B%EF%BC%9AFull%20GC-toc\" style=\"margin-left:40px;\"><a href=\"#%E8%BF%87%E7%A8%8B%E5%9B%9B%EF%BC%9AFull%20GC\" target=\"_blank\"  rel=\"nofollow\" >\u8fc7\u7a0b\u56db\uff1aFull GC<\/a><\/p>\n<hr id=\"hr-toc\">\n<h1 id=\"%E5%88%86%E5%8C%BARegion%EF%BC%9A%E5%8C%96%E6%95%B4%E4%B8%BA%E9%9B%B6\">\u5206\u533aRegion\uff1a\u5316\u6574\u4e3a\u96f6<\/h1>\n<p>\u4f7f\u7528 G1 \u6536\u96c6\u5668\u65f6\uff0c\u5b83\u5c06\u6574\u4e2a Java \u5806\u5212\u5206\u6210\u7ea6 2048&nbsp;\u4e2a\u5927\u5c0f\u76f8\u540c\u7684\u72ec\u7acb Region \u5757\uff0c\u6bcf\u4e2a Region \u5757\u5927\u5c0f\u6839\u636e\u5806\u7a7a\u95f4\u7684\u5b9e\u9645\u5927\u5c0f\u800c\u5b9a\uff0c\u6574\u4f53\u88ab\u63a7\u5236\u5728 1MB \u5230 32MB \u4e4b\u95f4\uff0c\u4e14\u4e3a 2 \u7684 N \u6b21\u5e42\uff0c\u53731MB,&nbsp;2MB,&nbsp;4MB,&nbsp;8MB,&nbsp;16MB,&nbsp;32MB\u3002\u53ef\u4ee5\u901a\u8fc7 -XX\uff1aG1HeapRegionSize \u8bbe\u5b9a\u3002\u6240\u6709\u7684 Region \u5927\u5c0f\u76f8\u540c\uff0c\u4e14\u5728 JVM \u751f\u547d\u5468\u671f\u5185\u4e0d\u4f1a\u88ab\u6539\u53d8<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"lazyload\"alt=\"\" height=\"352\" data-src=\"https:\/\/wp-moto-1258805347.cos.ap-shanghai.myqcloud.com\/default\/nine\/2023-07-14\/13-56-20\/202307141356208484ce0a7.png\" src=\"https:\/\/s.nmxc.ltd\/sakurairo_vision\/@2.6\/load_svg\/inload.svg\" onerror=\"imgError(this)\" width=\"444\"><noscript><img loading=\"lazy\" decoding=\"async\" alt=\"\" height=\"352\" src=\"https:\/\/wp-moto-1258805347.cos.ap-shanghai.myqcloud.com\/default\/nine\/2023-07-14\/13-56-20\/202307141356208484ce0a7.png\" width=\"444\"><\/noscript><\/p>\n<p>\u867d\u7136\u8fd8\u4fdd\u7559\u6709\u65b0\u751f\u4ee3\u548c\u8001\u5e74\u4ee3\u7684\u6982\u5ff5\uff0c\u4f46\u65b0\u751f\u4ee3\u548c\u8001\u5e74\u4ee3\u4e0d\u518d\u662f\u7269\u7406\u9694\u79bb\u7684\u4e86\uff0c\u5b83\u4eec\u90fd\u662f\u4e00\u90e8\u5206 Region\uff08\u4e0d\u9700\u8981\u8fde\u7eed\uff09\u7684\u96c6\u5408\u3002\u901a\u8fc7 Region \u7684\u52a8\u6001\u5206\u914d\u65b9\u5f0f\u5b9e\u73b0\u903b\u8f91\u4e0a\u7684\u8fde\u7eed<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"lazyload\"alt=\"\" height=\"292\" data-src=\"https:\/\/wp-moto-1258805347.cos.ap-shanghai.myqcloud.com\/default\/nine\/2023-07-14\/13-56-21\/20230714135621cdcdf7ce9.png\" src=\"https:\/\/s.nmxc.ltd\/sakurairo_vision\/@2.6\/load_svg\/inload.svg\" onerror=\"imgError(this)\" width=\"851\"><noscript><img loading=\"lazy\" decoding=\"async\" alt=\"\" height=\"292\" src=\"https:\/\/wp-moto-1258805347.cos.ap-shanghai.myqcloud.com\/default\/nine\/2023-07-14\/13-56-21\/20230714135621cdcdf7ce9.png\" width=\"851\"><\/noscript><\/p>\n<p>\u4e00\u4e2a Region \u6709\u53ef\u80fd\u5c5e\u4e8e Eden\uff0cSurvivor&nbsp;\u6216\u8005 Old \/ Tenured&nbsp;\u5185\u5b58\u533a\u57df\u3002\u4f46\u662f\u4e00\u4e2a Region \u53ea\u53ef\u80fd\u5c5e\u4e8e\u4e00\u4e2a\u89d2\u8272\u3002\u56fe\u4e2d\u7684 E \u8868\u793a\u8be5 Region \u5c5e\u4e8e Eden \u5185\u5b58\u533a\u57df\uff0cS&nbsp;\u8868\u793a\u5c5e\u4e8e Survivor \u5185\u5b58\u533a\u57df\uff0cO\u8868\u793a\u5c5e\u4e8e Old \u5185\u5b58\u533a\u57df\u3002\u56fe\u4e2d\u7a7a\u767d\u7684\u8868\u793a\u672a\u4f7f\u7528\u7684\u5185\u5b58\u7a7a\u95f4<\/p>\n<p>G1 \u5783\u573e\u6536\u96c6\u5668\u8fd8\u589e\u52a0\u4e86\u4e00\u79cd\u65b0\u7684\u5185\u5b58\u533a\u57df\uff0c\u53eb\u505a Humongous \u5185\u5b58\u533a\u57df\uff0c\u5982\u56fe\u4e2d\u7684 H \u5757\u3002\u4e3b\u8981\u7528\u4e8e\u5b58\u50a8\u5927\u5bf9\u8c61\uff0c\u5982\u679c\u8d85\u8fc7 1<strong>.<\/strong>5 \u4e2a Region\uff0c\u5c31\u653e\u5230 H<\/p>\n<h2 id=\"%E8%AE%BE%E7%BD%AEH%E7%9A%84%E5%8E%9F%E5%9B%A0\">\u8bbe\u7f6eH\u7684\u539f\u56e0<\/h2>\n<p>\u5bf9\u4e8e\u5806\u4e2d\u7684\u5927\u5bf9\u8c61\uff0c\u9ed8\u8ba4\u76f4\u63a5\u4f1a\u88ab\u5206\u914d\u5230\u8001\u5e74\u4ee3\uff0c\u4f46\u662f\u5982\u679c\u5b83\u662f\u4e00\u4e2a\u77ed\u671f\u5b58\u5728\u7684\u5927\u5bf9\u8c61\uff0c\u5c31\u4f1a\u5bf9\u5783\u573e\u6536\u96c6\u5668\u9020\u6210\u8d1f\u9762\u5f71\u54cd\u3002\u4e3a\u4e86\u89e3\u51b3\u8fd9\u4e2a\u95ee\u9898\uff0cG1 \u5212\u5206\u4e86\u4e00\u4e2a Humongous \u533a\uff0c\u5b83\u7528\u6765\u4e13\u95e8\u5b58\u653e\u5927\u5bf9\u8c61\u3002\u5982\u679c\u4e00\u4e2a H \u533a\u88c5\u4e0d\u4e0b\u4e00\u4e2a\u5927\u5bf9\u8c61\uff0c\u90a3\u4e48 G1 \u4f1a\u5bfb\u627e\u8fde\u7eed\u7684 H \u533a\u6765\u5b58\u50a8\u3002\u4e3a\u4e86\u80fd\u627e\u5230\u8fde\u7eed\u7684H \u533a\uff0c\u6709\u65f6\u5019\u4e0d\u5f97\u4e0d\u542f\u52a8 Full&nbsp;GC\u3002G1 \u7684\u5927\u591a\u6570\u884c\u4e3a\u90fd\u628a H \u533a\u4f5c\u4e3a\u8001\u5e74\u4ee3\u7684\u4e00\u90e8\u5206\u6765\u770b\u5f85<\/p>\n<h1 id=\"G1%E5%9B%9E%E6%94%B6%E5%99%A8%E5%9E%83%E5%9C%BE%E5%9B%9E%E6%94%B6%E8%BF%87%E7%A8%8B\">G1\u56de\u6536\u5668\u5783\u573e\u56de\u6536\u8fc7\u7a0b<\/h1>\n<p>G1&nbsp;GC \u7684\u5783\u573e\u56de\u6536\u8fc7\u7a0b\u4e3b\u8981\u5305\u62ec\u5982\u4e0b\u4e09\u4e2a\u73af\u8282\uff1a<\/p>\n<p> \u5e74\u8f7b\u4ee3 GC\uff08Young&nbsp;GC\uff09<\/p>\n<p> \u8001\u5e74\u4ee3\u5e76\u53d1\u6807\u8bb0\u8fc7\u7a0b\uff08Concurrent&nbsp;Marking\uff09\u6df7\u5408\u56de\u6536\uff08Mixed&nbsp;GC\uff09<\/p>\n<p> \u5982\u679c\u9700\u8981\uff0c\u5355\u7ebf\u7a0b\u3001\u72ec\u5360\u5f0f\u3001\u9ad8\u5f3a\u5ea6\u7684 Full&nbsp;GC \u8fd8\u662f\u7ee7\u7eed\u5b58\u5728\u7684\u3002\u5b83\u9488\u5bf9 G C\u7684\u8bc4\u4f30\u5931\u8d25\u63d0\u4f9b\u4e86\u4e00\u79cd\u5931\u8d25\u4fdd\u62a4\u673a\u5236\uff0c\u5373\u5f3a\u529b\u56de\u6536<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"lazyload\"alt=\"\" height=\"328\" data-src=\"https:\/\/wp-moto-1258805347.cos.ap-shanghai.myqcloud.com\/default\/nine\/2023-07-14\/13-56-22\/20230714135622c6c682a59.png\" src=\"https:\/\/s.nmxc.ltd\/sakurairo_vision\/@2.6\/load_svg\/inload.svg\" onerror=\"imgError(this)\" width=\"945\"><noscript><img loading=\"lazy\" decoding=\"async\" alt=\"\" height=\"328\" src=\"https:\/\/wp-moto-1258805347.cos.ap-shanghai.myqcloud.com\/default\/nine\/2023-07-14\/13-56-22\/20230714135622c6c682a59.png\" width=\"945\"><\/noscript><\/p>\n<p>\u5e94\u7528\u7a0b\u5e8f\u5206\u914d\u5185\u5b58\uff0c\u5f53\u5e74\u8f7b\u4ee3\u7684 Eden \u533a\u7528\u5c3d\u65f6\u5f00\u59cb\u5e74\u8f7b\u4ee3\u56de\u6536\u8fc7\u7a0b\uff1bG1 \u7684\u5e74\u8f7b\u4ee3\u6536\u96c6\u9636\u6bb5\u662f\u4e00\u4e2a\u5e76\u884c\u7684\u72ec\u5360\u5f0f\u6536\u96c6\u5668\u3002\u5728\u5e74\u8f7b\u4ee3\u56de\u6536\u671f\uff0cG1&nbsp;GC \u6682\u505c\u6240\u6709\u5e94\u7528\u7a0b\u5e8f\u7ebf\u7a0b\uff0c\u542f\u52a8\u591a\u7ebf\u7a0b\u6267\u884c\u5e74\u8f7b\u4ee3\u56de\u6536\u3002\u7136\u540e\u4ece\u5e74\u8f7b\u4ee3\u533a\u95f4\u79fb\u52a8\u5b58\u6d3b\u5bf9\u8c61\u5230 Survivor \u533a\u95f4\u6216\u8005\u8001\u5e74\u533a\u95f4\uff0c\u4e5f\u6709\u53ef\u80fd\u662f\u4e24\u4e2a\u533a\u95f4\u90fd\u4f1a\u6d89\u53ca<\/p>\n<p>\u5f53\u5806\u5185\u5b58\u4f7f\u7528\u8fbe\u5230\u4e00\u5b9a\u503c\uff08\u9ed8\u8ba4 45%\uff09\u65f6\uff0c\u5f00\u59cb\u8001\u5e74\u4ee3\u5e76\u53d1\u6807\u8bb0\u8fc7\u7a0b<\/p>\n<p>\u6807\u8bb0\u5b8c\u6210\u9a6c\u4e0a\u5f00\u59cb\u6df7\u5408\u56de\u6536\u8fc7\u7a0b\u3002\u5bf9\u4e8e\u4e00\u4e2a\u6df7\u5408\u56de\u6536\u671f\uff0cG1&nbsp;GC \u4ece\u8001\u5e74\u533a\u95f4\u79fb\u52a8\u5b58\u6d3b\u5bf9\u8c61\u5230\u7a7a\u95f2\u533a\u95f4\uff0c\u8fd9\u4e9b\u7a7a\u95f2\u533a\u95f4\u4e5f\u5c31\u6210\u4e3a\u4e86\u8001\u5e74\u4ee3\u7684\u4e00\u90e8\u5206\u3002\u548c\u5e74\u8f7b\u4ee3\u4e0d\u540c\uff0c\u8001\u5e74\u4ee3\u7684 G1 \u56de\u6536\u5668\u548c\u5176\u4ed6 GC\u4e0d\u540c\uff0cG1 \u7684\u8001\u5e74\u4ee3\u56de\u6536\u5668\u4e0d\u9700\u8981\u6574\u4e2a\u8001\u5e74\u4ee3\u88ab\u56de\u6536\uff0c\u4e00\u6b21\u53ea\u9700\u8981\u626b\u63cf \/ \u56de\u6536\u4e00\u5c0f\u90e8\u5206\u8001\u5e74\u4ee3\u7684Region \u5c31\u53ef\u4ee5\u4e86\u3002\u540c\u65f6\uff0c\u8fd9\u4e2a\u8001\u5e74\u4ee3 Region \u662f\u548c\u5e74\u8f7b\u4ee3\u4e00\u8d77\u88ab\u56de\u6536\u7684<\/p>\n<p> \u4e3e\u4e2a\u4f8b\u5b50\uff1a\u4e00\u4e2a web \u670d\u52a1\u5668\uff0cJava \u8fdb\u7a0b\u6700\u5927\u5806\u5185\u5b58\u4e3a 4G\uff0c\u6bcf\u5206\u949f\u54cd\u5e94 1500 \u4e2a\u8bf7\u6c42\uff0c\u6bcf 45 \u79d2\u949f\u4f1a\u65b0\u5206\u914d\u5927\u7ea6 2G \u7684\u5185\u5b58\u3002G1 \u4f1a\u6bcf 45 \u79d2\u949f\u8fdb\u884c\u4e00\u6b21\u5e74\u8f7b\u4ee3\u56de\u6536\uff0c\u6bcf 31 \u4e2a\u5c0f\u65f6\u6574\u4e2a\u5806\u7684\u4f7f\u7528\u7387\u4f1a\u8fbe\u5230 45%\uff0c\u4f1a\u5f00\u59cb\u8001\u5e74\u4ee3\u5e76\u53d1\u6807\u8bb0\u8fc7\u7a0b\uff0c\u6807\u8bb0\u5b8c\u6210\u540e\u5f00\u59cb\u56db\u5230\u4e94\u6b21\u7684\u6df7\u5408\u56de\u6536<\/p>\n<h2 id=\"Remembered%20Set\">Remembered Set<\/h2>\n<p>\u4e00\u4e2a\u5bf9\u8c61\u88ab\u4e0d\u540c\u533a\u57df\u5f15\u7528\u7684\u95ee\u9898<\/p>\n<p> \u4e00\u4e2a Region \u4e0d\u53ef\u80fd\u662f\u5b64\u7acb\u7684\uff0c\u4e00\u4e2a Region \u4e2d\u7684\u5bf9\u8c61\u53ef\u80fd\u88ab\u5176\u4ed6\u4efb\u610f Region \u4e2d\u5bf9\u8c61\u5f15\u7528\uff0c\u5224\u65ad\u5bf9\u8c61\u5b58\u6d3b\u65f6\uff0c\u662f\u5426\u9700\u8981\u626b\u63cf\u6574\u4e2a Java \u5806\u624d\u80fd\u4fdd\u8bc1\u51c6\u786e\u5462<\/p>\n<p> \u5728\u5176\u4ed6\u7684\u5206\u4ee3\u6536\u96c6\u5668\uff0c\u4e5f\u5b58\u5728\u8fd9\u6837\u7684\u95ee\u9898\uff08\u800c G1 \u66f4\u7a81\u51fa\uff09<\/p>\n<p> \u56de\u6536\u65b0\u751f\u4ee3\u4e5f\u4e0d\u5f97\u4e0d\u540c\u65f6\u626b\u63cf\u8001\u5e74\u4ee3<\/p>\n<p> \u8fd9\u6837\u7684\u8bdd\u4f1a\u964d\u4f4e Minor&nbsp;GC \u7684\u6548\u7387<\/p>\n<p> \u89e3\u51b3\u65b9\u6cd5\uff1a<\/p>\n<p> \u65e0\u8bba G1 \u8fd8\u662f\u5176\u4ed6\u5206\u4ee3\u6536\u96c6\u5668\uff0cJVM \u90fd\u662f\u4f7f\u7528 Remembered&nbsp;Set \u6765\u907f\u514d\u5168\u5c40\u626b\u63cf<\/p>\n<p> \u6bcf\u4e2a Region \u90fd\u6709\u4e00\u4e2a\u5bf9\u5e94\u7684 Remembered&nbsp;Set<\/p>\n<p> \u6bcf\u6b21 Reference \u7c7b\u578b\u6570\u636e\u5199\u64cd\u4f5c\u65f6\uff0c\u90fd\u4f1a\u4ea7\u751f\u4e00\u4e2a Write&nbsp;Barrier \u6682\u65f6\u4e2d\u65ad\u64cd\u4f5c<\/p>\n<p> \u7136\u540e\u68c0\u67e5\u5c06\u8981\u5199\u5165\u7684\u5f15\u7528\u6307\u5411\u7684\u5bf9\u8c61\u662f\u5426\u548c\u8be5 Reference \u7c7b\u578b\u6570\u636e\u5728\u4e0d\u540c\u7684 Region\uff08\u5176\u4ed6\u6536\u96c6\u5668\uff1b\u68c0\u67e5\u8001\u5e74\u4ee3\u5bf9\u8c61\u662f\u5426\u5f15\u7528\u4e86\u65b0\u751f\u4ee3\u5bf9\u8c61\uff09<\/p>\n<p> \u5982\u679c\u4e0d\u540c\uff0c\u901a\u8fc7 CardTable \u628a\u76f8\u5173\u5f15\u7528\u4fe1\u606f\u8bb0\u5f55\u5230\u5f15\u7528\u6307\u5411\u5bf9\u8c61\u7684\u6240\u5728 Region \u5bf9\u5e94\u7684 Remembered&nbsp;Set \u4e2d&nbsp;<\/p>\n<p> \u5f53\u8fdb\u884c\u5783\u573e\u6536\u96c6\u65f6\uff0c\u5728 GC \u6839\u8282\u70b9\u7684\u679a\u4e3e\u8303\u56f4\u52a0\u5165 Remembered&nbsp;Set ;&nbsp;\u5c31\u53ef\u4ee5\u4fdd\u8bc1\u4e0d\u8fdb\u884c\u5168\u5c40\u626b\u63cf\uff0c\u4e5f\u4e0d\u4f1a\u6709\u9057\u6f0f<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"lazyload\"alt=\"\" height=\"363\" data-src=\"https:\/\/wp-moto-1258805347.cos.ap-shanghai.myqcloud.com\/default\/nine\/2023-07-14\/13-56-22\/202307141356229595980e4.png\" src=\"https:\/\/s.nmxc.ltd\/sakurairo_vision\/@2.6\/load_svg\/inload.svg\" onerror=\"imgError(this)\" width=\"970\"><noscript><img loading=\"lazy\" decoding=\"async\" alt=\"\" height=\"363\" src=\"https:\/\/wp-moto-1258805347.cos.ap-shanghai.myqcloud.com\/default\/nine\/2023-07-14\/13-56-22\/202307141356229595980e4.png\" width=\"970\"><\/noscript><\/p>\n<h2 id=\"%E8%BF%87%E7%A8%8B%E4%B8%80%EF%BC%9A%E5%B9%B4%E8%BD%BB%E4%BB%A3GC\">\u8fc7\u7a0b\u4e00\uff1a\u5e74\u8f7b\u4ee3GC<\/h2>\n<p>JVM \u542f\u52a8\u65f6\uff0cG1&nbsp;\u5148\u51c6\u5907\u597d Eden \u533a\uff0c\u7a0b\u5e8f\u5728\u8fd0\u884c\u8fc7\u7a0b\u4e2d\u4e0d\u65ad\u521b\u5efa\u5bf9\u8c61\u5230 Eden \u533a\uff0c\u5f53 Eden \u7a7a\u95f4\u8017\u5c3d\u65f6\uff0cG1 \u4f1a\u542f\u52a8\u4e00\u6b21\u5e74\u8f7b\u4ee3\u5783\u573e\u56de\u6536\u8fc7\u7a0b<\/p>\n<p> \u5e74\u8f7b\u4ee3\u5783\u573e\u56de\u6536\u53ea\u4f1a\u56de\u6536 Eden \u533a\u548c Survivor \u533a<\/p>\n<p> YGC \u65f6\uff0c\u9996\u5148 G1 \u505c\u6b62\u5e94\u7528\u7a0b\u5e8f\u7684\u6267\u884c\uff08Stop-The-World\uff09\uff0cG1&nbsp;\u521b\u5efa\u56de\u6536\u96c6\uff08Collection&nbsp;Set\uff09\uff0c\u56de\u6536\u96c6\u662f\u6307\u9700\u8981\u88ab\u56de\u6536\u7684\u5185\u5b58\u5206\u6bb5\u7684\u96c6\u5408\uff0c\u5e74\u8f7b\u4ee3\u56de\u6536\u8fc7\u7a0b\u7684\u56de\u6536\u96c6\u5305\u542b\u5e74\u8f7b\u4ee3 Eden \u533a\u548c Survivor \u533a\u6240\u6709\u7684\u5185\u5b58\u5206\u6bb5<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"lazyload\"alt=\"\" height=\"507\" data-src=\"https:\/\/wp-moto-1258805347.cos.ap-shanghai.myqcloud.com\/default\/nine\/2023-07-14\/13-56-23\/20230714135623c8c8cbff1.png\" src=\"https:\/\/s.nmxc.ltd\/sakurairo_vision\/@2.6\/load_svg\/inload.svg\" onerror=\"imgError(this)\" width=\"812\"><noscript><img loading=\"lazy\" decoding=\"async\" alt=\"\" height=\"507\" src=\"https:\/\/wp-moto-1258805347.cos.ap-shanghai.myqcloud.com\/default\/nine\/2023-07-14\/13-56-23\/20230714135623c8c8cbff1.png\" width=\"812\"><\/noscript><\/p>\n<p><strong>\u7b2c\u4e00\u9636\u6bb5\uff0c\u626b\u63cf\u6839<\/strong><\/p>\n<p>\u6839\u662f\u6307 static \u53d8\u91cf\u6307\u5411\u7684\u5bf9\u8c61\uff0c\u6b63\u5728\u6267\u884c\u7684\u65b9\u6cd5\u8c03\u7528\u94fe\u6761\u4e0a\u7684\u5c40\u90e8\u53d8\u91cf\u7b49\u3002\u6839\u5f15\u7528\u8fde\u540c RSet<\/p>\n<p> \u8bb0\u5f55\u7684\u5916\u90e8\u5f15\u7528\u4f5c\u4e3a\u626b\u63cf\u5b58\u6d3b\u5bf9\u8c61\u7684\u5165\u53e3<\/p>\n<p><strong>\u7b2c\u4e8c\u9636\u6bb5\uff0c\u66f4\u65b0 RSet<\/strong><\/p>\n<p>\u5904\u7406 dirty&nbsp;card&nbsp;queue \u4e2d\u7684 card\uff0c\u66f4\u65b0 RSet\u3002\u6b64\u9636\u6bb5\u5b8c\u6210\u540e\uff0cRSet \u53ef\u4ee5\u51c6\u786e\u7684\u53cd\u6620\u8001\u5e74\u4ee3\u5bf9\u6240\u5728\u7684\u5185\u5b58\u5206\u6bb5\u4e2d\u5bf9\u8c61\u7684\u5f15\u7528<\/p>\n<p><strong>\u7b2c\u4e09\u9636\u6bb5\uff0c\u5904\u7406RSet<\/strong><\/p>\n<p>\u8bc6\u522b\u88ab\u8001\u5e74\u4ee3\u5bf9\u8c61\u6307\u5411\u7684 Eden \u4e2d\u7684\u5bf9\u8c61\uff0c\u8fd9\u4e9b\u88ab\u6307\u5411\u7684 Eden \u4e2d\u7684\u5bf9\u8c61\u88ab\u8ba4\u4e3a\u662f\u5b58\u6d3b\u7684\u5bf9\u8c61<\/p>\n<p><strong>\u7b2c\u56db\u9636\u6bb5\uff0c\u590d\u5236\u5bf9\u8c61<\/strong><\/p>\n<p>\u6b64\u9636\u6bb5\uff0c\u5bf9\u8c61\u6811\u88ab\u904d\u5386\uff0cEden \u533a\u5185\u5b58\u6bb5\u4e2d\u5b58\u6d3b\u7684\u5bf9\u8c61\u4f1a\u88ab\u590d\u5236\u5230 Survivor \u533a\u4e2d\u7a7a\u7684\u5185\u5b58\u5206\u6bb5\uff0cSurvivor \u533a\u5185\u5b58\u6bb5\u4e2d\u5b58\u6d3b\u7684\u5bf9\u8c61\u5982\u679c\u5e74\u9f84\u672a\u8fbe\u9608\u503c\uff0c\u5e74\u9f84\u4f1a\u52a0 1\uff0c\u8fbe\u5230\u9600\u503c\u4f1a\u88ab\u4f1a\u88ab\u590d\u5236\u5230 Old \u533a\u4e2d\u7a7a\u7684\u5185\u5b58\u5206\u6bb5\u3002\u5982\u679c Survivor \u7a7a\u95f4\u4e0d\u591f\uff0cEden \u7a7a\u95f4\u7684\u90e8\u5206\u6570\u636e\u4f1a\u76f4\u63a5\u664b\u5347\u5230\u8001\u5e74\u4ee3\u7a7a\u95f4<\/p>\n<p><strong>\u7b2c\u4e94\u9636\u6bb5\uff0c\u5904\u7406\u5f15\u7528<\/strong><\/p>\n<p>\u5904\u7406 Soft\uff0cWeak\uff0c&nbsp;Phantom\uff0c&nbsp;Final,&nbsp;JNI&nbsp;Weak \u7b49\u5f15\u7528\u3002\u6700\u7ec8 Eden \u7a7a\u95f4\u7684\u6570\u636e\u4e3a\u7a7a\uff0cGC \u505c\u6b62\u5de5\u4f5c\uff0c\u800c\u76ee\u6807\u5185\u5b58\u4e2d\u7684\u5bf9\u8c61\u90fd\u662f\u8fde\u7eed\u5b58\u50a8\u7684\uff0c\u6ca1\u6709\u788e\u7247\uff0c\u6240\u4ee5\u590d\u5236\u8fc7\u7a0b\u53ef\u4ee5\u8fbe\u5230\u5185\u5b58\u6574\u7406\u7684\u6548\u679c\uff0c\u51cf\u5c11\u788e\u7247<\/p>\n<h2 id=\"%E8%BF%87%E7%A8%8B%E4%BA%8C%EF%BC%9A%E5%B9%B6%E5%8F%91%E6%A0%87%E8%AE%B0%E8%BF%87%E7%A8%8B\">\u8fc7\u7a0b\u4e8c\uff1a\u5e76\u53d1\u6807\u8bb0\u8fc7\u7a0b<\/h2>\n<p><strong>\u521d\u59cb\u6807\u8bb0\u9636\u6bb5<\/strong><\/p>\n<p>\u6807\u8bb0\u4ece\u6839\u8282\u70b9\u76f4\u63a5\u53ef\u8fbe\u7684\u5bf9\u8c61\u3002\u8fd9\u4e2a\u9636\u6bb5\u662f STW \u7684\uff0c\u5e76\u4e14\u4f1a\u89e6\u4e00\u6b21\u5e74\u8f7b\u4ee3 GC<\/p>\n<p><strong>\u6839\u533a\u57df\u626b\u63cf\uff08Root&nbsp;Region&nbsp;Scanning\uff09<\/strong><\/p>\n<p>G1&nbsp;GC \u626b\u63cf Survivor \u533a\u76f4\u63a5\u53ef\u8fbe\u7684\u8001\u5e74\u4ee3\u533a\u57df\u5bf9\u8c61\uff0c\u5e76\u6807\u8bb0\u88ab\u5f15\u7528\u7684\u5bf9\u8c61\u3002\u8fd9\u4e00\u8fc7\u7a0b\u5fc5\u987b\u5728young&nbsp;GC \u4e4b\u524d\u5b8c\u6210<\/p>\n<p><strong>\u5e76\u53d1\u6807\u8bb0\uff08Concurrent&nbsp;Marking\uff09<\/strong><\/p>\n<p>\u5728\u6574\u4e2a\u5806\u4e2d\u8fdb\u884c\u5e76\u53d1\u6807\u8bb0\uff08\u548c\u5e94\u7528\u7a0b\u5e8f\u5e76\u53d1\u6267\u884c\uff09\uff0c\u6b64\u8fc7\u7a0b\u53ef\u80fd\u88ab youngGC \u4e2d\u65ad\u3002\u5728\u5e76\u53d1\u6807\u8bb0\u9636\u6bb5\uff0c\u82e5\u53d1\u73b0\u533a\u57df\u5bf9\u8c61\u4e2d\u7684\u6240\u6709\u5bf9\u8c61\u90fd\u662f\u5783\u573e\uff0c\u90a3\u8fd9\u4e2a\u533a\u57df\u4f1a\u88ab\u7acb\u5373\u56de\u6536\u3002\u540c\u65f6\uff0c\u5e76\u53d1\u6807\u8bb0\u8fc7\u7a0b\u4e2d\uff0c\u4f1a\u8ba1\u7b97\u6bcf\u4e2a\u533a\u57df\u7684\u5bf9\u8c61\u6d3b\u6027\uff08\u533a\u57df\u4e2d\u5b58\u6d3b\u5bf9\u8c61\u7684\u6bd4\u4f8b\uff09<\/p>\n<p><strong>\u518d\u6b21\u6807\u8bb0\uff08Remark\uff09<\/strong><\/p>\n<p>\u7531\u4e8e\u5e94\u7528\u7a0b\u5e8f\u6301\u7eed\u8fdb\u884c\uff0c\u9700\u8981\u4fee\u6b63\u4e0a\u4e00\u6b21\u7684\u6807\u8bb0\u7ed3\u679c\u3002\u662f STW\u7684\u3002G1 \u4e2d\u91c7\u7528\u4e86\u6bd4 CMS \u66f4\u5feb\u7684\u521d\u59cb\u5feb\u7167\u7b97\u6cd5\uff1asnapshot-at-the-beginning\uff08SATB\uff09<\/p>\n<p><strong>\u72ec\u5360\u6e05\u7406\uff08cleanup,STW\uff09<\/strong><\/p>\n<p>\u8ba1\u7b97\u5404\u4e2a\u533a\u57df\u7684\u5b58\u6d3b\u5bf9\u8c61\u548c GC \u56de\u6536\u6bd4\u4f8b\uff0c\u5e76\u8fdb\u884c\u6392\u5e8f\uff0c\u8bc6\u522b\u53ef\u4ee5\u6df7\u5408\u56de\u6536\u7684\u533a\u57df\u3002\u4e3a\u4e0b\u9636\u6bb5\u505a\u94fa\u57ab\u3002\u662f STW \u7684\u3002<\/p>\n<p>\u8fd9\u4e2a\u9636\u6bb5\u5e76\u4e0d\u4f1a\u5b9e\u9645\u4e0a\u53bb\u505a\u5783\u573e\u7684\u6536\u96c6<\/p>\n<p><strong>\u5e76\u53d1\u6e05\u7406\u9636\u6bb5<\/strong><\/p>\n<p>\u8bc6\u522b\u5e76\u6e05\u7406\u5b8c\u5168\u7a7a\u95f2\u7684\u533a\u57df<\/p>\n<h2 id=\"%E8%BF%87%E7%A8%8B%E4%B8%89%EF%BC%9A%E6%B7%B7%E5%90%88%E5%9B%9E%E6%94%B6\">\u8fc7\u7a0b\u4e09\uff1a\u6df7\u5408\u56de\u6536<\/h2>\n<p id=\"%E2%80%8B%E7%BC%96%E8%BE%91\"><img loading=\"lazy\" decoding=\"async\" class=\"lazyload\"alt=\"\" height=\"403\" data-src=\"https:\/\/wp-moto-1258805347.cos.ap-shanghai.myqcloud.com\/default\/nine\/2023-07-14\/13-56-23\/20230714135623969625188.png\" src=\"https:\/\/s.nmxc.ltd\/sakurairo_vision\/@2.6\/load_svg\/inload.svg\" onerror=\"imgError(this)\" width=\"512\"><noscript><img loading=\"lazy\" decoding=\"async\" alt=\"\" height=\"403\" src=\"https:\/\/wp-moto-1258805347.cos.ap-shanghai.myqcloud.com\/default\/nine\/2023-07-14\/13-56-23\/20230714135623969625188.png\" width=\"512\"><\/noscript><\/p>\n<p>\u5f53\u8d8a\u6765\u8d8a\u591a\u7684\u5bf9\u8c61\u664b\u5347\u5230\u8001\u5e74\u4ee3 oldregion \u65f6\uff0c\u4e3a\u4e86\u907f\u514d\u5806\u5185\u5b58\u88ab\u8017\u5c3d\uff0c\u865a\u62df\u673a\u4f1a\u89e6\u53d1\u4e00\u4e2a\u6df7\u5408\u7684\u5783\u573e\u6536\u96c6\u5668\uff0c\u5373 Mixed&nbsp;GC\uff0c\u8be5\u7b97\u6cd5\u5e76\u4e0d\u662f\u4e00\u4e2a OldGC\uff0c\u9664\u4e86\u56de\u6536\u6574\u4e2a 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