{"id":2919,"date":"2022-04-24T00:23:26","date_gmt":"2022-04-23T16:23:26","guid":{"rendered":"https:\/\/www.zeroheart.xyz\/wordpress\/?p=2919"},"modified":"2022-04-24T00:30:15","modified_gmt":"2022-04-23T16:30:15","slug":"java%e5%af%b9%e8%b1%a1%e5%86%85%e5%ad%98%e5%88%86%e9%85%8d","status":"publish","type":"post","link":"https:\/\/www.zeroheart.xyz\/wordpress\/?p=2919","title":{"rendered":"java\u5bf9\u8c61\u5185\u5b58\u5206\u914d"},"content":{"rendered":"\n

\u5bf9\u8c61\u4e00\u5b9a\u662f\u5206\u914d\u5230\u5806\u4e0a\u5417\uff1f<\/p>\n\n\n\n

\u4e0d\u662f\u7684<\/p>\n\n\n\n

java\u5bf9\u8c61\u7684\u5185\u5b58\u5206\u914d\u6d41\u7a0b – \u524d\u5ea6\u5218\u90ce – \u535a\u5ba2\u56ed (cnblogs.com)<\/a><\/p>\n\n\n\n

https:\/\/img2020.cnblogs.com\/blog\/1187916\/202110\/1187916-20211012101818062-1048005036.png<\/a><\/p>\n\n\n\n

\"\"<\/figure>\n\n\n\n

<\/p>\n\n\n\n

\u7b2c\u4e00\u6b65\u3001\u6ee1\u8db3\u4e00\u5b9a\u6761\u4ef6\uff0c\u53ef\u4ee5\u5728\u6808\u4e0a\u5206\u914d\u5bf9\u8c61<\/h2>\n\n\n\n
\"\"<\/figure>\n\n\n\n

Test2()\u65b9\u6cd5\u7684user\u5bf9\u8c61\u53ea\u4f1a\u5728\u5f53\u524d\u65b9\u6cd5\u5185\u6709\u6548\uff0c\u5982\u679c\u653e\u5728\u5806\u91cc\uff0c\u5728\u65b9\u6cd5\u7ed3\u675f\u540e\uff0c\u5176\u5b9e\u8fd9\u4e2a\u5bf9\u8c61\u5c31\u5df2\u7ecf\u662f\u5783\u573e\u7684\uff0c\u4f46\u5374\u5728\u5806\u91cc\u5360\u7528\u5806\u5185\u5b58\u7a7a\u95f4\u3002\u5982\u679c\u5c06\u8fd9\u4e2a\u5bf9\u8c61\u653e\u5165\u6808\u4e2d\uff0c\u968f\u7740\u65b9\u6cd5\u5165\u6808\uff0c\u903b\u8f91\u5904\u7406\u7ed3\u675f\uff0c\u5bf9\u8c61\u5c31\u53d8\u6210\u5783\u573e\u4e86\uff0c\u518d\u968f\u7740\u6808\u5e27\u51fa\u6808\u3002\u8fd9\u6837\u53ef\u4ee5\u8282\u7ea6\u5806\u7a7a\u95f4\u3002\u5c24\u5176\u662f\u8fd9\u79cd\u975e\u9003\u9038\u5bf9\u8c61\u5f88\u591a\u7684\u65f6\u5019\u3002\u53ef\u4ee5\u8282\u7701\u5927\u91cf\u7684\u5806\u7a7a\u95f4\uff0c\u964d\u4f4eGC\u7684\u6b21\u6570\u3002<\/p>\n\n\n\n

1.\u5f00\u542f\u9003\u9038\u5206\u6790\uff0c2\u5f00\u542f\u6807\u91cf\u66ff\u6362\u3002\u9ed8\u8ba4\u5f00\u542f<\/p>\n\n\n\n

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\u6807\u91cf\u66ff\u6362\uff0c\u6808\u5185\u6ca1\u6709\u8fde\u7eed\u7a7a\u95f4\u653e\u5bf9\u8c61\uff0c\u90a3\u4e48\u4f1a\u628a\u5bf9\u8c61\u7684\u5c5e\u6027\u653e\u5230\u4e0d\u540c\u7684\u7a7a\u95f2\u7a7a\u95f4\u4e0a\u3002<\/p>\n\n\n\n

\u8fd9\u6837\u7684\u5bf9\u8c61\uff0c\u5c31\u4f1a\u5728\u6808\u4e0a\u76f4\u63a5\u5206\u914d\u4e86\u3002<\/p>\n\n\n\n

\u7b2c\u4e8c\u6b65\uff1a\u5224\u65ad\u662f\u5426\u662f\u5927\u5bf9\u8c61\uff0c\u4e0d\u662f\u653e\u5230Eden\u533a<\/h2>\n\n\n\n

\u5224\u65ad\u662f\u5426\u662f\u5927\u5bf9\u8c61\uff0c\u5982\u679c\u662f\u5219\u76f4\u63a5\u653e\u5165\u5230\u8001\u5e74\u4ee3\u4e2d\u3002<\/p>\n\n\n\n

\u5982\u679c\u4e0d\u662f\uff0c\u5219\u5224\u65ad\u662f\u5426\u662fTLAB\uff1f\u5982\u679c\u662f\u5219\u5728Eden\u53bb\u5206\u914d\u4e00\u5c0f\u5757\u7a7a\u95f4\u7ed9\u7ebf\u7a0b\uff0c\u628a\u8fd9\u4e2a\u5bf9\u8c61\u653e\u5728Eden\u533a\u3002\u5982\u679c\u4e0d\u91c7\u7528TLAB\uff0c\u5219\u76f4\u63a5\u653e\u5230Eden\u533a\u3002<\/p>\n\n\n\n

\u4ec0\u4e48\u662fTLAB\u5462\uff1f\u672c\u5730\u7ebf\u7a0b\u5206\u914d\u7f13\u51b2\uff08Thread Local Allocation Buffer,TLAB\uff09\u3002\u7b80\u5355\u8bf4\uff0cTLAB\u662f\u4e3a\u4e86\u907f\u514d\u591a\u7ebf\u7a0b\u4e89\u62a2\u5185\u5b58\uff0c\u5728\u6bcf\u4e2a\u7ebf\u7a0b\u521d\u59cb\u5316\u7684\u65f6\u5019\uff0c\u5c31\u5728\u5806\u7a7a\u95f4\u4e2d\u4e3a\u7ebf\u7a0b\u5206\u914d\u4e00\u5757\u4e13\u5c5e\u7684\u5185\u5b58\u3002\u81ea\u5df1\u7ebf\u7a0b\u7684\u5bf9\u8c61\u5c31\u5f80\u81ea\u5df1\u4e13\u5c5e\u7684\u90a3\u5757\u5185\u5b58\u5b58\u653e\u5c31\u53ef\u4ee5\u4e86\u3002\u8fd9\u6837\u591a\u4e2a\u7ebf\u7a0b\u4e4b\u95f4\u5c31\u4e0d\u4f1a\u53bb\u54c4\u62a2\u540c\u4e00\u5757\u5185\u5b58\u4e86\u3002jdk8\u9ed8\u8ba4\u4f7f\u7528\u7684\u5c31\u662fTLAB\u7684\u65b9\u5f0f\u5206\u914d\u5185\u5b58\u3002<\/p>\n\n\n\n

\u901a\u8fc7-XX:+UseTLAB\u53c2\u6570\u6765\u8bbe\u5b9a\u865a\u62df\u673a\u662f\u5426\u542f\u7528TLAB(JVM\u4f1a\u9ed8\u8ba4\u5f00\u542f-XX:+UseTLAB)\uff0c\u00ad-XX:TLABSize \u6307\u5b9aTLAB\u5927\u5c0f\u3002<\/p>\n\n\n\n

\u7b2c\u4e09\u6b65 \u662f\u5927\u5bf9\u8c61 \u653e\u5165\u5230\u8001\u5e74\u4ee3<\/h2>\n\n\n\n

1.\u4ec0\u4e48\u662f\u5927\u5bf9\u8c61\uff1f<\/h3>\n\n\n\n
  • Eden\u56ed\u533a\u653e\u4e0d\u4e0b\u4e86\u80af\u5b9a\u662f\u5927\u5bf9\u8c61\u3002<\/li>
  • \u901a\u8fc7\u53c2\u6570\u8bbe\u7f6e\u4ec0\u4e48\u662f\u5927\u5bf9\u8c61\u3002-XX:PretenureSizeThreshold=1000000 (\u5355\u4f4d\u662f\u5b57\u8282) -XX:+UseSerialGC\u3002\u5982\u679c\u5bf9\u8c61\u8d85\u8fc7\u8bbe\u7f6e\u5927\u5c0f\u4f1a\u76f4\u63a5\u8fdb\u5165\u8001\u5e74\u4ee3\uff0c\u4e0d\u4f1a\u8fdb\u5165\u5e74\u8f7b\u4ee3\uff0c\u8fd9\u4e2a\u53c2\u6570\u53ea\u5728 Serial \u548cParNew\u4e24\u4e2a\u6536\u96c6\u5668\u4e0b\u6709\u6548\u3002<\/li>
  • \u957f\u671f\u5b58\u6d3b\u7684\u5bf9\u8c61\u5c06\u8fdb\u5165\u8001\u5e74\u4ee3\u3002\u865a\u62df\u673a\u91c7\u7528\u5206\u4ee3\u6536\u96c6\u7684\u601d\u60f3\u6765\u7ba1\u7406\u5185\u5b58\uff0c\u865a\u62df\u673a\u7ed9\u6bcf\u4e2a\u5bf9\u8c61\u8bbe\u7f6e\u4e86\u4e00\u4e2a\u5bf9\u8c61\u5e74\u9f84\uff08Age\uff09\u8ba1\u6570\u5668\u3002 \u5982\u679c\u5bf9\u8c61\u5728 Eden \u51fa\u751f\u5e76\u7ecf\u8fc7\u7b2c\u4e00\u6b21 Minor GC \u540e\u4ecd\u7136\u80fd\u591f\u5b58\u6d3b\uff0c\u5e76\u4e14\u80fd\u88ab Survivor \u5bb9\u7eb3\u7684\u8bdd\uff0c\u5c06\u88ab\u79fb\u52a8\u5230 Survivor \u7a7a\u95f4\u4e2d\uff0c\u5e76\u5c06\u5bf9\u8c61\u5e74\u9f84\u8bbe\u4e3a1\u3002\u5bf9\u8c61\u5728 Survivor \u4e2d\u6bcf\u71ac\u8fc7\u4e00\u6b21 MinorGC\uff0c\u5e74\u9f84\u5c31\u589e\u52a01\u5c81\uff0c\u5f53\u5b83\u7684\u5e74\u9f84\u589e\u52a0\u5230\u4e00\u5b9a\u7a0b\u5ea6\uff08\u9ed8\u8ba4\u4e3a15\u5c81\uff0cCMS\u6536\u96c6\u5668\u9ed8\u8ba46\u5c81\uff0c\u4e0d\u540c\u7684\u5783\u573e\u6536\u96c6\u5668\u4f1a\u7565\u5fae\u6709\u70b9\u4e0d\u540c\uff09\uff0c\u5c31\u4f1a\u88ab\u664b\u5347\u5230\u8001\u5e74\u4ee3\u4e2d\u3002\u5bf9\u8c61\u664b\u5347\u5230\u8001\u5e74\u4ee3\u7684\u5e74\u9f84\u9608\u503c\uff0c\u53ef\u4ee5\u901a\u8fc7\u53c2\u6570 -XX:MaxTenuringThreshold \u6765\u8bbe\u7f6e\u3002<\/li><\/ul>\n\n\n\n

    2.\u4e3a\u4ec0\u4e48\u8981\u5c06\u5927\u5bf9\u8c61\u76f4\u63a5\u653e\u5165\u5230\u8001\u5e74\u4ee3\u5462\uff1f<\/h3>\n\n\n\n

    \u4e3a\u4e86\u907f\u514d\u4e3a\u5927\u5bf9\u8c61\u5206\u914d\u5185\u5b58\u65f6\u7684\u590d\u5236\u64cd\u4f5c\u800c\u964d\u4f4e\u6548\u7387\u3002<\/p>\n\n\n\n

    3.\u4ec0\u4e48\u60c5\u51b5\u8981\u624b\u52a8\u8bbe\u7f6e\u5206\u4ee3\u5e74\u9f84\u5462\uff1f<\/h3>\n\n\n\n

    \u5982\u679c\u6211\u7684\u7cfb\u7edf\u91cc80%\u7684\u5bf9\u8c61\u90fd\u662f\u6709\u7528\u7684\u5bf9\u8c61\uff0c\u90a3\u4e48\u7ecf\u8fc715\u6b21GC\u540e\u4f1a\u5728Survivor\u4e2d\u6765\u56de\u7ffb\u8f6c\uff0c\u8fd9\u65f6\u5019\u4e0d\u5982\u5c31\u5c06\u5206\u4ee3\u5e74\u9f84\u8bbe\u7f6e\u4e3a5\u6216\u80058\uff0c\u8fd9\u6837\u51cf\u5c11\u5728Survivor\u4e2d\u6765\u56de\u7ffb\u8f6c\u7684\u6b21\u6570\uff0c\u76f4\u63a5\u653e\u5165\u5230\u8001\u5e74\u4ee3\uff0c\u8282\u7701\u4e86\u5e74\u8f7b\u4ee3\u7684\u7a7a\u95f4\u3002<\/p>\n\n\n\n

    <\/p>\n","protected":false},"excerpt":{"rendered":"

    \u5bf9\u8c61\u4e00\u5b9a\u662f\u5206\u914d\u5230\u5806\u4e0a\u5417\uff1f \u4e0d\u662f\u7684 java\u5bf9\u8c61\u7684\u5185\u5b58\u5206\u914d\u6d41\u7a0b – \u524d\u5ea6\u5218\u90ce – \u535a\u5ba2\u56ed […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[6],"tags":[],"_links":{"self":[{"href":"https:\/\/www.zeroheart.xyz\/wordpress\/index.php?rest_route=\/wp\/v2\/posts\/2919"}],"collection":[{"href":"https:\/\/www.zeroheart.xyz\/wordpress\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.zeroheart.xyz\/wordpress\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.zeroheart.xyz\/wordpress\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.zeroheart.xyz\/wordpress\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=2919"}],"version-history":[{"count":13,"href":"https:\/\/www.zeroheart.xyz\/wordpress\/index.php?rest_route=\/wp\/v2\/posts\/2919\/revisions"}],"predecessor-version":[{"id":2934,"href":"https:\/\/www.zeroheart.xyz\/wordpress\/index.php?rest_route=\/wp\/v2\/posts\/2919\/revisions\/2934"}],"wp:attachment":[{"href":"https:\/\/www.zeroheart.xyz\/wordpress\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=2919"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.zeroheart.xyz\/wordpress\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=2919"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.zeroheart.xyz\/wordpress\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=2919"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}