{"id":14045,"date":"2023-07-25T09:45:55","date_gmt":"2023-07-25T01:45:55","guid":{"rendered":"https:\/\/blog.ywdevops.cn\/?p=14045"},"modified":"2023-07-26T11:57:26","modified_gmt":"2023-07-26T03:57:26","slug":"jvm-2","status":"publish","type":"post","link":"https:\/\/blog.ywdevops.cn\/index.php\/2023\/07\/25\/jvm-2\/","title":{"rendered":"JVM\u5806\u5185\u5b58"},"content":{"rendered":"\n<p class=\"wp-block-paragraph\">JAVA\u5806\u5185\u5b58\u7ba1\u7406\u662f\u5f71\u54cd\u6027\u80fd\u4e3b\u8981\u56e0\u7d20\u4e4b\u4e00\uff0c\u5806\u5185\u5b58\u6ea2\u51fa\u662fJava\u8fd0\u884c\u65f6\u5e38\u89c1\u7684\u6545\u969c\uff0c\u9996\u5148\u770b\u4e0bJAVA\u5806\u5185\u5b58\u5de5\u4f5c\u5212\u5206\uff0c\u5982\u56fe\uff1a<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"706\" height=\"617\" src=\"https:\/\/blog.ywdevops.cn\/wp-content\/uploads\/2023\/07\/4-6.png\" alt=\"\" class=\"wp-image-14065\" srcset=\"https:\/\/blog.ywdevops.cn\/wp-content\/uploads\/2023\/07\/4-6.png 706w, https:\/\/blog.ywdevops.cn\/wp-content\/uploads\/2023\/07\/4-6-300x262.png 300w, https:\/\/blog.ywdevops.cn\/wp-content\/uploads\/2023\/07\/4-6-600x524.png 600w\" sizes=\"auto, (max-width: 706px) 100vw, 706px\" \/><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">JVM\u5185\u5b58\u5212\u5206\u4e3a\u5806\u5185\u5b58\u548c\u975e\u5806\u5185\u5b58\uff0c\u5806\u5185\u5b58\u53c8\u5206\u4e3a\u5e74\u8f7b\u4ee3\u3001\u8001\u5e74\u4ee3\u3001\u975e\u5806\u5185\u5b58\u5c31\u53ea\u6709\u6c38\u4e45\u4ee3(<mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-vivid-purple-color\">\u5728JDK1.8\u4e4b\u540e\u5df2\u5e9f\u5f03\uff0c\u6539\u4e3a\u5143\u7a7a\u95f4<\/mark>)<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u5e74\u8f7b\u4ee3\u53c8\u5206\u4e3aEden\u548cSurvivor\u4e24\u4e2a\u533a\uff0cSurvivor\u5219\u662f\u6709FromSpace\u548cToSpace\u7ec4\u6210\uff0cEden\u533a\u5360\u6bd4\u8f83\u5927\u7684\u5bb9\u91cf\uff0cSurvivor\u4e24\u4e2a\u533a\u5360\u7528\u5bb9\u91cf\u8f83\u5c0f\uff0c\u9ed8\u8ba4\u6bd4\u4f8b\u4e3a8:1:1<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u5806\u5185\u5b58\u7684\u7528\u9014\uff1a\u4e3b\u8981\u5b58\u653e\u7684\u662f\u5bf9\u8c61\u5b9e\u4f8b\uff0c\u5f53Java\u521b\u5efa\u4e86\u4e00\u4e2a\u7c7b\u7684\u5b9e\u4f8b\u5bf9\u8c61\u6216\u8005\u6570\u7ec4\u7684\u65f6\u5019\uff0c\u4f1a\u5728\u5806\u4e2d\u4e3a\u65b0\u7684\u5bf9\u8c61\u5b9e\u4f8b\u5206\u914d\u5185\u5b58\uff0c\u865a\u62df\u673a\u4e2d\u53ea\u6709\u4e00\u4e2a\u5806\uff0c\u7a0b\u5e8f\u4e2d\u7684\u6240\u6709\u7ebf\u7a0b\u90fd\u5171\u4eab\u5b83\uff0c\u5806\u7684\u5b58\u53d6\u65b9\u5f0f\u4e3a\u7ba1\u9053\u7c7b\u578b\uff0c\u5148\u8fdb\u5148\u51fa\uff0c\u5728\u7a0b\u5e8f\u8fd0\u884c\u65f6\uff0c\u53ef\u81ea\u5b9a\u4e49\u8bbe\u7f6e\u5806\u7684\u5927\u5c0f<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u975e\u5806\u5185\u5b58\u7528\u9014\uff1a\u5143\u7a7a\u95f4\uff0c\u4e5f\u79f0\u4e3a\u65b9\u6cd5\u533a\uff0c\u5b58\u50a8\u7a0b\u5e8f\u8fd0\u884c\u65f6\u957f\u671f\u5b58\u6d3b\u7684\u5bf9\u8c61\uff0c\u6bd4\u5982\u7c7b\u7684\u5143\u6570\u636e\u3001\u65b9\u6cd5\u3001\u5e38\u91cf\u3001\u5c5e\u6027\u7b49<\/p>\n\n\n\n<p class=\"has-luminous-vivid-amber-background-color has-background wp-block-paragraph\">\u6ce8\u610f\uff1a\u5143\u7a7a\u95f4\u5e76\u4e0d\u5728JVM\u4e2d\uff0c\u800c\u662f\u4f7f\u7528\u672c\u5730\u7684\u5185\u5b58<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u5143\u7a7a\u95f4\u6709\u6ce8\u610f\u6709\u4e24\u4e2a\u53c2\u6570\uff1a<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>MetaspaceSize \uff1a\u521d\u59cb\u5316\u5143\u7a7a\u95f4\u5927\u5c0f\uff0c\u63a7\u5236\u53d1\u751fGC\u9608\u503c<\/li>\n\n\n\n<li>MaxMetaspaceSize \uff1a \u9650\u5236\u5143\u7a7a\u95f4\u5927\u5c0f\u4e0a\u9650\uff0c\u9632\u6b62\u5f02\u5e38\u5360\u7528\u8fc7\u591a\u7269\u7406\u5185\u5b58\uff0c\u9ed8\u8ba4\u65e0\u9650\u5236<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">GC\u6536\u96c6\u987a\u5e8f\u5982\u4e0b\uff1a<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u5f53Java\u521b\u5efa\u4e00\u4e2a\u7c7b\u7684\u5b9e\u4f8b\u540e\uff0c\u9996\u5148\u5c06\u6b64\u5b9e\u4f8b\u5bf9\u8c61\u653e\u5728\u5e74\u8f7b\u4ee3Eden\u533a\uff0cEden\u533a\u7a7a\u95f4\u6ee1\u4e86\u540e\u4f1a\u89e6\u53d1Minor GC\uff0c\u5c06\u5b58\u6d3b\u7684\u5bf9\u8c61\u901a\u8fc7\u590d\u5236\u7b97\u6cd5\u590d\u5236\u5230Suvivor0\u533a\uff0c\u4e5f\u5c31\u662f\u4e0a\u56fe\u4e2d\u7684FromSpace<\/li>\n\n\n\n<li>\u5f53Suvivor0\u533a\u6ee1\u4e86\u540e\uff0c\u518d\u6b21\u89e6\u53d1MinorGC\uff0c\u5c06Suvivor0\u4e2d\u7684\u5b58\u6d3b\u5bf9\u8c61\u590d\u5236\u5230Suvivor1\u533a\uff0c\u4e5f\u5c31\u662f\u4e0a\u9762\u7684ToSpace\u533a<\/li>\n\n\n\n<li>\u6bcf\u7ecf\u8fc7\u4e00\u6b21Major GC\u4ecd\u5b58\u6d3b,\u5e74\u9f84\u5c31\u52a01\uff0c\u5f53\u5bf9\u8c61\u8fbe\u5230\u4e00\u5b9a\u5e74\u9f84\u65f6(\u9ed8\u8ba415\u5c81),\u5c31\u4f1a\u88ab\u79fb\u5230\u8001\u5e74\u4ee3<\/li>\n\n\n\n<li>\u8001\u5e74\u4ee3\u5b58\u50a8\u957f\u671f\u5b58\u6d3b\u7684\u5bf9\u8c61\uff0c\u5360\u6ee1\u65f6\u4f1a\u89e6\u53d1Major GC=Full GC\uff0cGC\u671f\u95f4\u4f1a\u505c\u6b62\u6240\u6709\u7ebf\u7a0b\u7b49\u5f85GC\u5b8c\u6210\uff0c\u6240\u4ee5\u5bf9\u54cd\u5e94\u8981\u6c42\u9ad8\u7684\u5e94\u7528\u5c3d\u91cf\u51cf\u5c11\u53d1\u751fMajor GC\uff0c\u907f\u514d\u54cd\u5e94\u8d85\u65f6\u3002<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Minor GC \uff1a \u6e05\u7406\u5e74\u8f7b\u4ee3<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Major GC \uff1a \u6e05\u7406\u8001\u5e74\u4ee3<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Full GC \uff1a \u6e05\u7406\u6574\u4e2a\u5806\u7a7a\u95f4\uff0c\u5305\u62ec\u5e74\u8f7b\u4ee3\u3001\u8001\u5e74\u4ee3\u548c\u6c38\u4e45\u4ee3\uff0c\u6240\u6709GC\u90fd\u4f1a\u505c\u6b62\u5e94\u7528\u6240\u6709\u7ebf\u7a0b<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">FromSpace\u548cToSpace\u7684\u4e3b\u8981\u533a\u522b\uff1a<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>&nbsp;FromSpace &#8211; \u8fd9\u4e2a\u7a7a\u95f4\u7528\u4e8e\u6700\u521d\u5206\u914d\u5bf9\u8c61\u3002\u5f53\u5b83\u5373\u5c06\u6ee1\u65f6,Minor GC \u5c31\u4f1a\u542f\u52a8<\/li>\n\n\n\n<li>ToSpace &#8211; \u8fd9\u4e2a\u7a7a\u95f4\u6700\u521d\u662f\u7a7a\u7684\u3002Minor GC \u65f6,\u5b58\u6d3b\u7684\u5bf9\u8c61\u4f1a\u88ab\u590d\u5236\u5230\u8fd9\u91cc<\/li>\n\n\n\n<li>&nbsp;\u6bcf\u6b21 Minor GC \u540e,fromSpace \u548c toSpace \u7684\u89d2\u8272\u4f1a\u4ea4\u6362\u3002\u65b0\u7684\u5bf9\u8c61\u4f1a\u5206\u914d\u5230\u539f\u6765\u7684 toSpace \u4e2d,\u8fd9\u4e2a\u7a7a\u95f4\u73b0\u5728\u53d8\u6210\u4e86 fromSpace<\/li>\n\n\n\n<li>fromSpace \u548c toSpace \u7684\u5927\u5c0f\u662f\u76f8\u7b49\u7684,\u4ee5\u5bb9\u7eb3\u5b58\u6d3b\u5bf9\u8c61\u7684\u590d\u5236\u64cd\u4f5c<\/li>\n\n\n\n<li>Minor GC \u4f7f\u7528\u590d\u5236\u7b97\u6cd5,\u5c31\u662f\u5c06 fromSpace \u4e2d\u5b58\u6d3b\u7684\u5bf9\u8c61\u590d\u5236\u5230 toSpace,\u7136\u540e\u6e05\u7406 fromSpace<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">JVM\u5806\u5185\u5b58\u5e38\u7528\u53c2\u6570<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table><tbody><tr><td class=\"has-text-align-center\" data-align=\"center\">\u53c2\u6570<\/td><td class=\"has-text-align-center\" data-align=\"center\">\u63cf\u8ff0<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\">-Xms<\/td><td class=\"has-text-align-center\" data-align=\"center\">\u5806\u5185\u5b58\u521d\u59cb\u5927\u5c0f\uff0c\u5355\u4f4dm\u3001g<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\">-Xmx\uff08MaxHeapSize\uff09<\/td><td class=\"has-text-align-center\" data-align=\"center\">\u5806\u5185\u5b58\u6700\u5927\u5141\u8bb8\u5927\u5c0f\uff0c\u4e00\u822c\u4e0d\u8981\u5927\u4e8e\u7269\u7406\u5185\u5b58\u768480%<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\">-XX:NewSize\uff08-Xns\uff09<\/td><td class=\"has-text-align-center\" data-align=\"center\">\u5e74\u8f7b\u4ee3\u5185\u5b58\u521d\u59cb\u5927\u5c0f<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\">-XX:MaxNewSize\uff08-Xmn\uff09<\/td><td class=\"has-text-align-center\" data-align=\"center\">\u5e74\u8f7b\u4ee3\u5185\u5b58\u6700\u5927\u5141\u8bb8\u5927\u5c0f\uff0c\u5b98\u65b9\u63a8\u8350\u914d\u7f6e\u4e3a\u6574\u4e2a\u5806\u76843\/8<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\">-XX:PermSize<\/td><td class=\"has-text-align-center\" data-align=\"center\">\u975e\u5806\u5185\u5b58\u521d\u59cb\u5927\u5c0f\uff0c\u4e00\u822c\u8bbe\u7f6e\u521d\u59cb\u5316200m\uff0c\u6700\u59271024m\u8db3\u591f<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\">-XX:MaxPermSize<\/td><td class=\"has-text-align-center\" data-align=\"center\">\u975e\u5806\u5185\u5b58\u6700\u5927\u5141\u8bb8\u5927\u5c0f<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\">-XX:MetaspaceSize<\/td><td class=\"has-text-align-center\" data-align=\"center\">\u8bbe\u7f6e\u5143\u7a7a\u95f4\u6700\u5c0f\u5927\u5c0f(JDK8\u4ee5\u540e)<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\">-XX:MaxMetaspaceSize<\/td><td class=\"has-text-align-center\" data-align=\"center\">\u8bbe\u7f6e\u5143\u7a7a\u95f4\u6700\u5927\u5927\u5c0f(JDK8\u4ee5\u540e)<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\">-Xss<\/td><td class=\"has-text-align-center\" data-align=\"center\">\u8bbe\u7f6e\u6bcf\u4e2a\u7ebf\u7a0b\u7684\u5806\u6808\u5927\u5c0f\uff0cJDK5\u4ee5\u540e\u9ed8\u8ba4\u4e3a1M<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">\u4ec0\u4e48\u60c5\u51b5\u4e0b\u4f1a\u51fa\u73b0\u5806\u5185\u5b58\u6ea2\u51fa\uff1f<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u5e74\u8f7b\u4ee3\u4e2d\u7ecf\u8fc7GC\u540e\u8fd8\u5b58\u6d3b\u7684\u5bf9\u8c61\u4f1a\u88ab\u590d\u5236\u5230\u8001\u5e74\u4ee3\u4e2d\u3002\u5f53\u8001\u5e74\u4ee3\u7a7a\u95f4\u4e0d\u8db3\u65f6\uff0cJVM\u4f1a\u5bf9\u8001\u5e74\u4ee3\u8fdb\u884c\u5b8c\u5168\u7684\u5783\u573e\u56de\u6536\uff08Full GC\uff09\u3002\u5982\u679cGC\u540e\uff0c\u8fd8\u662f\u65e0\u6cd5\u5b58\u653e\u4eceSurvivor\u533a\u590d\u5236\u8fc7\u6765\u7684\u5bf9\u8c61\uff0c\u5c31\u4f1a\u51fa\u73b0OOM\uff08Out of Memory\uff09<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">OOM\u5e38\u89c1\u6709\u4ee5\u4e0b\u51e0\u4e2a\u539f\u56e0\uff1a<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u8001\u5e74\u4ee3\u5185\u5b58\u4e0d\u8db3\uff1ajava.lang.OutOfMemoryError:Javaheapspace<\/li>\n\n\n\n<li>\u6c38\u4e45\u4ee3\u5185\u5b58\u4e0d\u8db3\uff1ajava.lang.OutOfMemoryError:PermGenspace<\/li>\n\n\n\n<li>\u4ee3\u7801bug\uff0c\u5360\u7528\u5185\u5b58\u65e0\u6cd5\u53ca\u65f6\u56de\u6536<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">\u4e3a\u4ec0\u4e48\u8981\u5206\u591a\u79cd\u4ee3\uff1f<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u5c06\u5bf9\u8c61\u6839\u636e\u5b58\u6d3b\u6982\u7387\u8fdb\u884c\u5206\u7c7b\uff0c\u5bf9\u5b58\u6d3b\u65f6\u95f4\u957f\u7684\u5bf9\u8c61\uff0c\u653e\u5230\u56fa\u5b9a\u533a\uff0c\u4ece\u800c\u51cf\u5c11\u626b\u63cf\u5783\u573e\u65f6\u95f4\u53caGC\u9891\u7387\u3002\u9488\u5bf9\u5206\u7c7b\u8fdb\u884c\u4e0d\u540c\u7684\u5783\u573e\u56de\u6536\u7b97\u6cd5\uff0c\u5bf9\u7b97\u6cd5\u626c\u957f\u907f\u77ed<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u4e3a\u4ec0\u4e48Survivor\u5206\u4e3a\u4e24\u5757\u5927\u5c0f\u76f8\u7b49\u7684\u5e78\u5b58\u7a7a\u95f4\uff1f<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u4e3b\u8981\u4e3a\u4e86\u89e3\u51b3\u788e\u7247\u5316\u3002\u5982\u679c\u5185\u5b58\u788e\u7247\u5316\u4e25\u91cd\uff0c\u4e5f\u5c31\u662f\u4e24\u4e2a\u5bf9\u8c61\u5360\u7528\u4e0d\u8fde\u7eed\u7684\u5185\u5b58\uff0c\u5df2\u6709\u7684\u8fde\u7eed\u5185\u5b58\u4e0d\u591f\u65b0\u5bf9\u8c61\u5b58\u653e\uff0c\u5c31\u4f1a\u89e6\u53d1GC<\/p>\n\n\n\n<p class=\"has-text-align-center wp-block-paragraph\">\u5783\u573e\u56de\u6536\u7b97\u6cd5<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">1\u3001\u6807\u8bb0-\u6e05\u9664\uff08Mark-Sweep\uff09<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">GC\u5206\u4e3a\u4e24\u4e2a\u9636\u6bb5\uff0c\u6807\u8bb0\u548c\u6e05\u9664\u3002\u9996\u5148\u6807\u8bb0\u6240\u6709\u53ef\u56de\u6536\u7684\u5bf9\u8c61\uff0c\u5728\u6807\u8bb0\u5b8c\u6210\u540e\u7edf\u4e00\u56de\u6536\u6240\u6709\u88ab\u6807\u8bb0\u7684\u5bf9\u8c61\u3002\u540c\u65f6\u4f1a\u4ea7\u751f\u4e0d\u8fde\u7eed\u7684\u5185\u5b58\u788e\u7247\u3002\u788e\u7247\u8fc7\u591a\u4f1a\u5bfc\u81f4\u4ee5\u540e\u7a0b\u5e8f\u8fd0\u884c\u65f6\u9700\u8981\u5206\u914d\u8f83\u5927\u5bf9\u8c61\u65f6\uff0c\u65e0\u6cd5\u627e\u5230\u8db3\u591f\u7684\u8fde\u7eed\u5185\u5b58\uff0c\u800c\u4e0d\u5f97\u5df2\u518d\u6b21\u89e6\u53d1GC<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">2\u3001\u590d\u5236\uff08Copy\uff09<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u5c06\u5185\u5b58\u6309\u5bb9\u91cf\u5212\u5206\u4e3a\u4e24\u5757\uff0c\u6bcf\u6b21\u53ea\u4f7f\u7528\u5176\u4e2d\u4e00\u5757\u3002\u5f53\u8fd9\u4e00\u5757\u5185\u5b58\u7528\u5b8c\u4e86\uff0c\u5c31\u5c06\u5b58\u6d3b\u7684\u5bf9\u8c61\u590d\u5236\u5230\u53e6\u4e00\u5757\u4e0a\uff0c\u7136\u540e\u518d\u628a\u5df2\u4f7f\u7528\u7684\u5185\u5b58\u7a7a\u95f4\u4e00\u6b21\u6e05\u7406\u6389\u3002\u8fd9\u6837\u4f7f\u5f97\u6bcf\u6b21\u90fd\u662f\u5bf9\u534a\u4e2a\u5185\u5b58\u533a\u56de\u6536\uff0c\u4e5f\u4e0d\u7528\u8003\u8651\u5185\u5b58\u788e\u7247\u95ee\u9898\uff0c\u7b80\u5355\u9ad8\u6548\u3002\u7f3a\u70b9\u9700\u8981\u4e24\u500d\u7684\u5185\u5b58\u7a7a\u95f4<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">3\u3001\u6807\u8bb0-\u6574\u7406\uff08Mark-Compact\uff09<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u4e5f\u5206\u4e3a\u4e24\u4e2a\u9636\u6bb5\uff0c\u9996\u5148\u6807\u8bb0\u53ef\u56de\u6536\u7684\u5bf9\u8c61\uff0c\u518d\u5c06\u5b58\u6d3b\u7684\u5bf9\u8c61\u90fd\u5411\u4e00\u7aef\u79fb\u52a8\uff0c\u7136\u540e\u6e05\u7406\u6389\u8fb9\u754c\u4ee5\u5916\u7684\u5185\u5b58\u3002\u6b64\u65b9\u6cd5\u907f\u514d\u6807\u8bb0-\u6e05\u9664\u7b97\u6cd5\u7684\u788e\u7247\u95ee\u9898\uff0c\u540c\u65f6\u4e5f\u907f\u514d\u4e86\u590d\u5236\u7b97\u6cd5\u7684\u7a7a\u95f4\u95ee\u9898<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u4e00\u822c\u5e74\u8f7b\u4ee3\u4e2d\u6267\u884cGC\u540e\uff0c\u4f1a\u6709\u5c11\u91cf\u7684\u5bf9\u8c61\u5b58\u6d3b\uff0c\u5c31\u4f1a\u9009\u7528\u590d\u5236\u7b97\u6cd5\uff0c\u53ea\u8981\u4ed8\u51fa\u5c11\u91cf\u7684\u5b58\u6d3b\u5bf9\u8c61\u590d\u5236\u6210\u672c\u5c31\u53ef\u4ee5\u5b8c\u6210\u6536\u96c6\u3002\u800c\u8001\u5e74\u4ee3\u4e2d\u56e0\u4e3a\u5bf9\u8c61\u5b58\u6d3b\u7387\u9ad8\uff0c\u6ca1\u6709\u989d\u5916\u8fc7\u591a\u5185\u5b58\u7a7a\u95f4\u5206\u914d\uff0c\u5c31\u9700\u8981\u4f7f\u7528\u6807\u8bb0-\u6e05\u7406\u6216\u8005\u6807\u8bb0-\u6574\u7406\u7b97\u6cd5\u6765\u8fdb\u884c\u56de\u6536<\/p>\n\n\n\n<p class=\"has-text-align-center wp-block-paragraph\">\u5783\u573e\u6536\u96c6\u5668<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">1\u3001\u4e32\u884c\u6536\u96c6\u5668\uff08Serial\uff09<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u6bd4\u8f83\u8001\u7684\u6536\u96c6\u5668\uff0c\u5355\u7ebf\u7a0b\u3002\u6536\u96c6\u65f6\uff0c\u5fc5\u987b\u6682\u505c\u5e94\u7528\u7684\u5de5\u4f5c\u7ebf\u7a0b\uff0c\u76f4\u5230\u6536\u96c6\u7ed3\u675f<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">2\u3001\u5e76\u884c\u6536\u96c6\u5668\uff08Parallel\uff09<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u591a\u6761\u5783\u573e\u6536\u96c6\u7ebf\u7a0b\u5e76\u884c\u5de5\u4f5c\uff0c\u5728\u591a\u6838CPU\u4e0b\u6548\u7387\u66f4\u9ad8\uff0c\u5e94\u7528\u7ebf\u7a0b\u4ecd\u7136\u5904\u4e8e\u7b49\u5f85\u72b6\u6001<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">3\u3001CMS\u6536\u96c6\u5668\uff08Concurrent Mark Sweep\uff09<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">CMS\u6536\u96c6\u5668\u662f\u7f29\u77ed\u6682\u505c\u5e94\u7528\u65f6\u95f4\u4e3a\u76ee\u6807\u800c\u8bbe\u8ba1\u7684\uff0c\u662f\u57fa\u4e8e\u6807\u8bb0-\u6e05\u9664\u7b97\u6cd5\u5b9e\u73b0\uff0c\u6574\u4e2a\u8fc7\u7a0b\u5206\u4e3a4\u4e2a\u6b65\u9aa4\uff0c\u5305\u62ec\uff1a<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u521d\u59cb\u6807\u8bb0\uff08Initial Mark\uff09<\/li>\n\n\n\n<li>\u5e76\u53d1\u6807\u8bb0\uff08Concurrent Mark\uff09<\/li>\n\n\n\n<li>\u91cd\u65b0\u6807\u8bb0\uff08Remark\uff09<\/li>\n\n\n\n<li>\u5e76\u53d1\u6e05\u9664\uff08Concurrent Sweep\uff09<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">\u521d\u59cb\u6807\u8bb0\u3001\u91cd\u65b0\u6807\u8bb0\u8fd9\u4e24\u4e2a\u6b65\u9aa4\u4ecd\u7136\u9700\u8981\u6682\u505c\u5e94\u7528\u7ebf\u7a0b\u3002\u521d\u59cb\u6807\u8bb0\u53ea\u662f\u6807\u8bb0\u4e00\u4e0bGC Roots\u80fd\u76f4\u63a5\u5173\u8054\u5230\u7684\u5bf9\u8c61\uff0c\u901f\u5ea6\u5f88\u5feb\uff0c\u5e76\u53d1\u6807\u8bb0\u9636\u6bb5\u662f\u6807\u8bb0\u53ef\u56de\u6536\u5bf9\u8c61\uff0c\u800c\u91cd\u65b0\u6807\u8bb0\u9636\u6bb5\u5219\u662f\u4e3a\u4e86\u4fee\u6b63\u5e76\u53d1\u6807\u8bb0\u671f\u95f4\u56e0\u7528\u6237\u7a0b\u5e8f\u7ee7\u7eed\u8fd0\u4f5c\u5bfc\u81f4\u6807\u8bb0\u4ea7\u751f\u53d8\u52a8\u7684\u90a3\u4e00\u90e8\u5206\u5bf9\u8c61\u7684\u6807\u8bb0\u8bb0\u5f55\uff0c\u8fd9\u4e2a\u9636\u6bb5\u6682\u505c\u65f6\u95f4\u6bd4\u521d\u59cb\u6807\u8bb0\u9636\u6bb5\u7a0d\u957f\u4e00\u70b9\uff0c\u4f46\u8fdc\u6bd4\u5e76\u53d1\u6807\u8bb0\u65f6\u95f4\u6bb5\uff0c\u7531\u4e8e\u6574\u4e2a\u8fc7\u7a0b\u4e2d\u6d88\u8017\u6700\u957f\u7684\u5e76\u53d1\u6807\u8bb0\u548c\u5e76\u53d1\u6e05\u9664\u8fc7\u7a0b\u6536\u96c6\u5668\u7ebf\u7a0b\u90fd\u53ef\u4ee5\u4e0e\u7528\u6237\u7ebf\u7a0b\u4e00\u8d77\u5de5\u4f5c\uff0c\u6240\u4ee5\uff0cCMS\u6536\u96c6\u5668\u5185\u5b58\u56de\u6536\u4e0e\u7528\u6237\u4e00\u8d77\u5e76\u53d1\u6267\u884c\u7684\uff0c\u5927\u5927\u51cf\u5c11\u4e86\u6682\u505c\u65f6\u95f4<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">4\u3001G1\u6536\u96c6\u5668\uff08Garbage First\uff09<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">G1\u6536\u96c6\u5668\u5c06\u5806\u5185\u5b58\u5212\u5206\u591a\u4e2a\u5927\u5c0f\u76f8\u7b49\u7684\u72ec\u7acb\u533a\u57df\uff08Region\uff09\uff0c\u5e76\u4e14\u80fd\u9884\u6d4b\u6682\u505c\u65f6\u95f4\uff0c\u80fd\u9884\u6d4b\u539f\u56e0\u5b83\u80fd\u907f\u514d\u5bf9\u6574\u4e2a\u5806\u8fdb\u884c\u5168\u533a\u6536\u96c6\u3002G1\u8ddf\u8e2a\u5404\u4e2aRegion\u91cc\u7684\u5783\u573e\u5806\u79ef\u4ef7\u503c\u5927\u5c0f\uff08\u6240\u83b7\u5f97\u7a7a\u95f4\u5927\u5c0f\u4ee5\u53ca\u56de\u6536\u6240\u9700\u65f6\u95f4\uff09\uff0c\u5728\u540e\u53f0\u7ef4\u62a4\u4e00\u4e2a\u4f18\u5148\u5217\u8868\uff0c\u6bcf\u6b21\u6839\u636e\u5141\u8bb8\u7684\u6536\u96c6\u65f6\u95f4\uff0c\u4f18\u5148\u56de\u6536\u4ef7\u503c\u6700\u5927\u7684Region\uff0c\u4ece\u800c\u4fdd\u8bc1\u4e86\u518d\u6709\u9650\u65f6\u95f4\u5185\u83b7\u5f97\u66f4\u9ad8\u7684\u6536\u96c6\u6548\u7387<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">G1\u6536\u96c6\u5668\u5de5\u4f5c\u5de5\u7a0b\u5206\u4e3a4\u4e2a\u6b65\u9aa4\uff0c\u5305\u62ec\uff1a<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u521d\u59cb\u6807\u8bb0\uff08Initial Mark\uff09<\/li>\n\n\n\n<li>\u5e76\u53d1\u6807\u8bb0\uff08Concurrent Mark\uff09<\/li>\n\n\n\n<li>\u6700\u7ec8\u6807\u8bb0\uff08Final Mark\uff09<\/li>\n\n\n\n<li>\u7b5b\u9009\u56de\u6536\uff08Live Data Counting and Evacuation\uff09<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">\u521d\u59cb\u6807\u8bb0\u4e0eCMS\u4e00\u6837\uff0c\u6807\u8bb0\u4e00\u4e0bGC Roots\u80fd\u76f4\u63a5\u5173\u8054\u5230\u7684\u5bf9\u8c61\u3002\u5e76\u53d1\u6807\u8bb0\u4eceGC Root\u5f00\u59cb\u6807\u8bb0\u5b58\u6d3b\u5bf9\u8c61\uff0c\u8fd9\u4e2a\u9636\u6bb5\u8017\u65f6\u6bd4\u8f83\u957f\uff0c\u4f46\u4e5f\u53ef\u4ee5\u4e0e\u5e94\u7528\u7ebf\u7a0b\u5e76\u53d1\u6267\u884c\u3002\u800c\u6700\u7ec8\u6807\u8bb0\u4e5f\u662f\u4e3a\u4e86\u4fee\u6b63\u5728\u5e76\u53d1\u6807\u8bb0\u671f\u95f4\u56e0\u7528\u6237\u7a0b\u5e8f\u7ee7\u7eed\u8fd0\u4f5c\u800c\u5bfc\u81f4\u6807\u8bb0\u4ea7\u751f\u53d8\u5316\u7684\u90a3\u4e00\u90e8\u5206\u6807\u8bb0\u8bb0\u5f55\u3002\u6700\u540e\u5728\u7b5b\u9009\u56de\u6536\u9636\u6bb5\u5bf9\u5404\u4e2aRegion\u56de\u6536\u4ef7\u503c\u548c\u6210\u672c\u8fdb\u884c\u6392\u5e8f\uff0c\u6839\u636e\u7528\u6237\u6240\u671f\u671b\u7684GC\u6682\u505c\u65f6\u95f4\u6765\u6267\u884c\u56de\u6536<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u5783\u573e\u6536\u96c6\u5668\u53c2\u6570<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table><tbody><tr><td class=\"has-text-align-center\" data-align=\"center\">\u53c2\u6570<\/td><td class=\"has-text-align-center\" data-align=\"center\">\u63cf\u8ff0<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\">-XX:+UseSerialGC<\/td><td class=\"has-text-align-center\" data-align=\"center\">\u4e32\u884c\u6536\u96c6\u5668<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\">-XX:+UseParallelGC<\/td><td class=\"has-text-align-center\" data-align=\"center\">\u5e76\u884c\u6536\u96c6\u5668<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\">-XX:+UseParallelGCThreads=8<\/td><td class=\"has-text-align-center\" data-align=\"center\">\u5e76\u884c\u6536\u96c6\u5668\u7ebf\u7a0b\u6570\uff0c\u540c\u65f6\u6709\u591a\u5c11\u4e2a\u7ebf\u7a0b\u8fdb\u884c\u5783\u573e\u56de\u6536\uff0c\u4e00\u822c\u4e0eCPU\u6570\u91cf\u76f8\u7b49<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\">-XX:+UseParallelOldGC<\/td><td class=\"has-text-align-center\" data-align=\"center\">\u6307\u5b9a\u8001\u5e74\u4ee3\u4e3a\u5e76\u884c\u6536\u96c6<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\">-XX:+UseConcMarkSweepGC<\/td><td class=\"has-text-align-center\" data-align=\"center\">CMS\u6536\u96c6\u5668\uff08\u5e76\u53d1\u6536\u96c6\u5668\uff09<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\">-XX:+UseCMSCompactAtFullCollection<\/td><td class=\"has-text-align-center\" data-align=\"center\"><code>\u5f00\u542f\u5185\u5b58\u7a7a\u95f4\u538b\u7f29\u548c\u6574\u7406\uff0c\u9632\u6b62\u8fc7\u591a\u5185\u5b58\u788e\u7247<\/code><\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\">-XX:CMSFullGCsBeforeCompaction=0<\/td><td class=\"has-text-align-center\" data-align=\"center\">\u8868\u793a\u591a\u5c11\u6b21Full GC\u540e\u5f00\u59cb\u538b\u7f29\u548c\u6574\u7406\uff0c0\u8868\u793a\u6bcf\u6b21Full GC\u540e\u7acb\u5373\u6267\u884c\u538b\u7f29\u548c\u6574\u7406<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\">-XX:CMSInitiatingOccupancyFraction=80%<\/td><td class=\"has-text-align-center\" data-align=\"center\">\u8868\u793a\u8001\u5e74\u4ee3\u5185\u5b58\u7a7a\u95f4\u4f7f\u752880%\u65f6\u5f00\u59cb\u6267\u884cCMS\u6536\u96c6\uff0c\u9632\u6b62\u8fc7\u591a\u7684Full GC<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\">-XX:+UseG1GC<\/td><td class=\"has-text-align-center\" data-align=\"center\">G1\u6536\u96c6\u5668<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\">-XX:MaxTenuringThreshold=0<\/td><td class=\"has-text-align-center\" data-align=\"center\">\u5728\u5e74\u8f7b\u4ee3\u7ecf\u8fc7\u51e0\u6b21GC\u540e\u8fd8\u5b58\u6d3b\uff0c\u5c31\u8fdb\u5165\u8001\u5e74\u4ee3\uff0c0\u8868\u793a\u76f4\u63a5\u8fdb\u5165\u8001\u5e74\u4ee3<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">\u914d\u7f6e\u793a\u4f8b<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">1\u3001\u914d\u7f6e\u5e74\u8f7b\u4ee3\u4f7f\u7528\u5e76\u884c\u6536\u96c6\u5668\uff0c\u5982\u4e0b\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>java -Xmx2048m -Xms2048m -Xmn2g -Xss256k -XX:+UseParallelGC -XX:ParallelGCThreads=8<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\u4e0a\u8ff0\u914d\u7f6e\u7684\u5e76\u884c\u6536\u96c6\u5668\u4ec5\u5bf9\u5e74\u8f7b\u4ee3\u6709\u6548\uff0c\u8001\u5e74\u4ee3\u4ecd\u7136\u4f7f\u7528\u4e32\u884c\u6536\u96c6\u5668<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">2\u3001\u6dfb\u52a0\u4e00\u4e2a\u53c2\u6570\uff0c\u8ba9\u8001\u5e74\u4ee3\u4e5f\u662f\u7528\u5e76\u884c\u6536\u96c6\u5668\uff0c\u5982\u4e0b\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>java -Xmx2048m -Xms2048m -Xmn2g -Xss256k -XX:+UseParallelGC -XX:ParallelGCThreads=8 -XX:+UseParallelOldGC<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\u5e38\u89c1\u914d\u7f6e\u5982\u4e0b\uff1a<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">1\u3001\u5806\u914d\u7f6e<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>-Xms:\u521d\u59cb\u5806\u5927\u5c0f \n-Xmx:\u6700\u5927\u5806\u5927\u5c0f \n-XX:NewSize=n:\u8bbe\u7f6e\u5e74\u8f7b\u4ee3\u5927\u5c0f \n-XX:NewRatio=n:\u8bbe\u7f6e\u5e74\u8f7b\u4ee3\u548c\u5e74\u8001\u4ee3\u7684\u6bd4\u503c.\u5982:\u4e3a3,\u8868\u793a\u5e74\u8f7b\u4ee3\u4e0e\u5e74\u8001\u4ee3\u6bd4\u503c\u4e3a1:3,\u5e74\u8f7b\u4ee3\u5360\u6574\u4e2a\u5e74\u8f7b\u4ee3\u5e74\u8001\u4ee3\u548c\u76841\/4 \n-XX:SurvivorRatio=n:\u5e74\u8f7b\u4ee3\u4e2dEden\u533a\u4e0e\u4e24\u4e2aSurvivor\u533a\u7684\u6bd4\u503c.\u6ce8\u610fSurvivor\u533a\u6709\u4e24\u4e2a.\u5982:3,\u8868\u793aEden:Survivor=3:2,\u4e00\u4e2aSurvivor\u533a\u5360\u6574\u4e2a\u5e74\u8f7b\u4ee3\u76841\/5 \n-XX:MaxPermSize=n:\u8bbe\u7f6e\u6301\u4e45\u4ee3\u5927\u5c0f<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">2\u3001\u6536\u96c6\u5668\u8bbe\u7f6e&nbsp;<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>-XX:+UseSerialGC:\u8bbe\u7f6e\u4e32\u884c\u6536\u96c6\u5668 \n-XX:+UseParallelGC:\u8bbe\u7f6e\u5e76\u884c\u6536\u96c6\u5668 \n-XX:+UseParalledlOldGC:\u8bbe\u7f6e\u5e76\u884c\u5e74\u8001\u4ee3\u6536\u96c6\u5668 \n-XX:+UseConcMarkSweepGC:\u8bbe\u7f6e\u5e76\u53d1\u6536\u96c6\u5668<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">3\u3001\u5783\u573e\u56de\u6536\u7edf\u8ba1\u4fe1\u606f<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>-XX:+PrintGC \n-XX:+PrintGCDetails \n-XX:+PrintGCTimeStamps \n-Xloggc:filename<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">4\u3001\u5e76\u884c\u6536\u96c6\u5668\u8bbe\u7f6e<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>-XX:ParallelGCThreads=n:\u8bbe\u7f6e\u5e76\u884c\u6536\u96c6\u5668\u6536\u96c6\u65f6\u4f7f\u7528\u7684CPU\u6570.\u5e76\u884c\u6536\u96c6\u7ebf\u7a0b\u6570. \n-XX:MaxGCPauseMillis=n:\u8bbe\u7f6e\u5e76\u884c\u6536\u96c6\u6700\u5927\u6682\u505c\u65f6\u95f4 \n-XX:GCTimeRatio=n:\u8bbe\u7f6e\u5783\u573e\u56de\u6536\u65f6\u95f4\u5360\u7a0b\u5e8f\u8fd0\u884c\u65f6\u95f4\u7684\u767e\u5206\u6bd4.\u516c\u5f0f\u4e3a1\/(1+n)<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">JVM\u521d\u59cb\u5206\u914d\u7684\u5185\u5b58\u7531-Xms\u6307\u5b9a,\u9ed8\u8ba4\u662f\u7269\u7406\u5185\u5b58\u76841\/64;JVM\u6700\u5927\u5206\u914d\u7684\u5185\u5b58\u7531-Xmx\u6307\u5b9a,\u9ed8\u8ba4\u662f\u7269\u7406\u5185\u5b58\u76841\/4.\u9ed8\u8ba4\u7a7a\u4f59\u5806\u5185\u5b58\u5c0f\u4e8e40%\u65f6,JVM\u5c31\u4f1a\u589e\u5927\u5806\u76f4\u5230-Xmx\u7684\u6700\u5927\u9650\u5236;\u7a7a\u4f59\u5806\u5185\u5b58\u5927\u4e8e70%\u65f6, JVM\u4f1a\u51cf\u5c11\u5806\u76f4\u5230-Xms\u7684\u6700\u5c0f\u9650\u5236.<strong><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-vivid-purple-color\">\u56e0\u6b64\u4e00\u822c\u8bbe\u7f6e-Xms,-Xmx\u76f8\u7b49<\/mark><\/strong>\u4ee5\u907f\u514d\u5728\u6bcf\u6b21GC \u540e\u8c03\u6574\u5806\u7684\u5927\u5c0f<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u5e38\u7528\u547d\u4ee4<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">1\u3001\u67e5\u770b\u5806\u5185\u5b58\u4fe1\u606f<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>jmap -heap pid      #\u67e5\u770b\u5806\u5185\u5b58<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">2\u3001\u6253\u5370\u5806\u6808\u4fe1\u606f<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>jmap -dump:format=b,file=java.dump PID<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">3\u3001\u5728\u542f\u52a8java\u7a0b\u5e8f\u7684\u65f6\u5019\u6307\u5b9a\u53c2\u6570\u6765\u6253\u5370dump<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>-XX:+HeapDumpOnOutOfMemoryError -XX:HeapDumpPath=D:\\jvm.dump<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">4\u3001\u751f\u4ea7\u73af\u5883\u53ef\u4f7f\u7528arthas\u6765\u6392\u67e5\u95ee\u9898<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u9996\u5148\u6267\u884c\u547d\u4ee4jar -jar arthas-boot.jar\uff0c\u6b64\u65f6\u4f1a\u5217\u51fa\u673a\u5668\u4e0a\u5168\u90e8\u7684Java\u8fdb\u7a0b\uff0c\u5982\u56fe\uff1a<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"706\" height=\"379\" src=\"https:\/\/blog.ywdevops.cn\/wp-content\/uploads\/2023\/07\/10-6.png\" alt=\"\" class=\"wp-image-14143\" srcset=\"https:\/\/blog.ywdevops.cn\/wp-content\/uploads\/2023\/07\/10-6.png 706w, https:\/\/blog.ywdevops.cn\/wp-content\/uploads\/2023\/07\/10-6-300x161.png 300w, https:\/\/blog.ywdevops.cn\/wp-content\/uploads\/2023\/07\/10-6-600x322.png 600w\" sizes=\"auto, (max-width: 706px) 100vw, 706px\" \/><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">\u8f93\u5165\u524d\u9762\u7684\u5e8f\u53f7\uff0c\u8fdb\u5165\u5230\u8fdb\u7a0b\u91cc\u9762\uff0c\u5982\u56fe\uff1a<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"704\" height=\"445\" src=\"https:\/\/blog.ywdevops.cn\/wp-content\/uploads\/2023\/07\/1-9.png\" alt=\"\" class=\"wp-image-14145\" srcset=\"https:\/\/blog.ywdevops.cn\/wp-content\/uploads\/2023\/07\/1-9.png 704w, https:\/\/blog.ywdevops.cn\/wp-content\/uploads\/2023\/07\/1-9-300x190.png 300w, https:\/\/blog.ywdevops.cn\/wp-content\/uploads\/2023\/07\/1-9-600x379.png 600w\" sizes=\"auto, (max-width: 704px) 100vw, 704px\" \/><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">\u8f93\u5165dashboard\u540e\uff0c\u8fdb\u5165\u5168\u5c40\u9875\u9762\uff0c\u53ef\u67e5\u770b\u7ebf\u7a0b\uff0c\u5185\u5b58\uff0cGC\uff0c\u73af\u5883\u7b49\u4fe1\u606f\uff0c\u622a\u53d6\u5806\u5185\u5b58\u90e8\u5206\u5982\u56fe\uff1a<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"706\" height=\"241\" src=\"https:\/\/blog.ywdevops.cn\/wp-content\/uploads\/2023\/07\/2-7.png\" alt=\"\" class=\"wp-image-14147\" srcset=\"https:\/\/blog.ywdevops.cn\/wp-content\/uploads\/2023\/07\/2-7.png 706w, https:\/\/blog.ywdevops.cn\/wp-content\/uploads\/2023\/07\/2-7-300x102.png 300w, https:\/\/blog.ywdevops.cn\/wp-content\/uploads\/2023\/07\/2-7-600x205.png 600w\" sizes=\"auto, (max-width: 706px) 100vw, 706px\" \/><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">\u8f93\u5165thread\u53ef\u4ee5\u67e5\u770b\u7ebf\u7a0b\u8be6\u7ec6\u60c5\u51b5\uff0c\u5982\u56fe\uff1a<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"703\" height=\"235\" src=\"https:\/\/blog.ywdevops.cn\/wp-content\/uploads\/2023\/07\/3-8.png\" alt=\"\" class=\"wp-image-14150\" srcset=\"https:\/\/blog.ywdevops.cn\/wp-content\/uploads\/2023\/07\/3-8.png 703w, https:\/\/blog.ywdevops.cn\/wp-content\/uploads\/2023\/07\/3-8-300x100.png 300w, https:\/\/blog.ywdevops.cn\/wp-content\/uploads\/2023\/07\/3-8-600x201.png 600w\" sizes=\"auto, (max-width: 703px) 100vw, 703px\" \/><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">\u8f93\u5165&nbsp;<strong>thread<\/strong>\u52a0\u4e0a\u7ebf\u7a0bID<strong>&nbsp;<\/strong>\u53ef\u4ee5\u67e5\u770b\u7ebf\u7a0b\u5806\u6808\uff0c\u5982\u56fe\uff1a<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"704\" height=\"239\" src=\"https:\/\/blog.ywdevops.cn\/wp-content\/uploads\/2023\/07\/4-7.png\" alt=\"\" class=\"wp-image-14152\" srcset=\"https:\/\/blog.ywdevops.cn\/wp-content\/uploads\/2023\/07\/4-7.png 704w, https:\/\/blog.ywdevops.cn\/wp-content\/uploads\/2023\/07\/4-7-300x102.png 300w, https:\/\/blog.ywdevops.cn\/wp-content\/uploads\/2023\/07\/4-7-600x204.png 600w\" sizes=\"auto, (max-width: 704px) 100vw, 704px\" \/><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">5\u3001\u914d\u7f6e\u8f93\u51faGC\u65e5\u5fd7<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>java -jar -Xloggc:\/data\/gc.log -XX:+PrintGCDetails -XX:+PrintGCDateStamps  -XX:+PrintGCTimeStamps -XX:+PrintGCCause  -XX:+UseGCLogFileRotation -XX:NumberOfGCLogFiles=10 -XX:GCLogFileSize=100M    abc.jar<\/code><\/pre>\n\n\n\n<ul class=\"wp-block-list\">\n<li>-XX:+PrintGCDetails\uff1a\u6253\u5370\u6bcf\u6b21GC\u7684\u8be6\u7ec6\u65e5\u5fd7<\/li>\n\n\n\n<li>-XX:+PrintGCDateStamps\uff1a\u5728GC\u65e5\u5fd7\u524d\u6253\u5370\u5f53\u524d\u65e5\u671f<\/li>\n\n\n\n<li>-XX:+PrintGCTimeStamps\uff1a\u5728GC\u65e5\u5fd7\u524d\u6253\u5370\u5f53\u524d\u65f6\u95f4<\/li>\n\n\n\n<li>-XX:+PrintGCCause\uff1a\u6253\u5370\u89e6\u53d1GC\u7684\u539f\u56e0<\/li>\n\n\n\n<li>-XX:+UseGCLogFileRotation\uff1a\u542f\u7528GC\u65e5\u5fd7\u6587\u4ef6\u7684\u81ea\u52a8\u8f6c\u50a8<\/li>\n\n\n\n<li>-XX:NumberOfGCLogFiles=10\uff1aGC\u65e5\u5fd7\u6587\u4ef6\u5faa\u73af\u6570\u76ee\u4e3a10<\/li>\n\n\n\n<li>-XX:GCLogFileSize=100M\uff1a\u6bcf\u4e2aGC\u65e5\u5fd7\u6587\u4ef6\u7684\u5927\u5c0f\u4e3a100MB<\/li>\n<\/ul>\n","protected":false},"excerpt":{"rendered":"<p>JAVA\u5806\u5185\u5b58\u7ba1\u7406\u662f\u5f71\u54cd\u6027\u80fd\u4e3b\u8981\u56e0\u7d20\u4e4b\u4e00\uff0c\u5806\u5185\u5b58\u6ea2\u51fa\u662fJava\u8fd0\u884c\u65f6\u5e38\u89c1\u7684\u6545\u969c\uff0c\u9996\u5148\u770b\u4e0bJAVA\u5806\u5185\u5b58\u5de5\u4f5c\u5212\u5206 [&hellip;]<\/p>\n","protected":false},"author":3,"featured_media":14046,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[119,22],"tags":[],"class_list":["post-14045","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-java","category-server"],"blocksy_meta":{"styles_descriptor":{"styles":{"desktop":"","tablet":"","mobile":""},"google_fonts":[],"version":8}},"_links":{"self":[{"href":"https:\/\/blog.ywdevops.cn\/index.php\/wp-json\/wp\/v2\/posts\/14045","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/blog.ywdevops.cn\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/blog.ywdevops.cn\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/blog.ywdevops.cn\/index.php\/wp-json\/wp\/v2\/users\/3"}],"replies":[{"embeddable":true,"href":"https:\/\/blog.ywdevops.cn\/index.php\/wp-json\/wp\/v2\/comments?post=14045"}],"version-history":[{"count":80,"href":"https:\/\/blog.ywdevops.cn\/index.php\/wp-json\/wp\/v2\/posts\/14045\/revisions"}],"predecessor-version":[{"id":14159,"href":"https:\/\/blog.ywdevops.cn\/index.php\/wp-json\/wp\/v2\/posts\/14045\/revisions\/14159"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/blog.ywdevops.cn\/index.php\/wp-json\/wp\/v2\/media\/14046"}],"wp:attachment":[{"href":"https:\/\/blog.ywdevops.cn\/index.php\/wp-json\/wp\/v2\/media?parent=14045"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/blog.ywdevops.cn\/index.php\/wp-json\/wp\/v2\/categories?post=14045"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/blog.ywdevops.cn\/index.php\/wp-json\/wp\/v2\/tags?post=14045"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}