{"id":20,"date":"2017-04-19T17:31:25","date_gmt":"2017-04-19T09:31:25","guid":{"rendered":"http:\/\/www.myway5.com\/?p=20"},"modified":"2017-04-19T17:31:39","modified_gmt":"2017-04-19T09:31:39","slug":"jvm-study-lesson-2","status":"publish","type":"post","link":"https:\/\/www.myway5.com\/index.php\/2017\/04\/19\/jvm-study-lesson-2\/","title":{"rendered":"Java\u865a\u62df\u673a\u5b66\u4e60\u8bb0\u5f55(\u4e8c)-\u8fd0\u884c\u65f6\u6570\u636e\u533a\u57df"},"content":{"rendered":"

\u4e00\u3001\u524d\u8a00<\/h2>\n

Java\u865a\u62df\u673a\u5728\u6267\u884cJava\u7a0b\u5e8f\u7684\u8fc7\u7a0b\u4e2d\uff0c\u4f1a\u628a\u4ed6\u7ba1\u7406\u7684\u5185\u5b58\u5212\u5206\u4e3a\u591a\u4e2a\u4e0d\u540c\u7684\u6570\u636e\u533a\u57df\uff0c\u8fd9\u4e9b\u533a\u57df\u5404\u81ea\u6709\u5404\u81ea\u7684\u7528\u9014\uff0c\u4ee5\u53ca\u521b\u5efa\u548c\u9500\u6bc1\u7684\u65f6\u95f4\uff0c\u6709\u7684\u533a\u57df\u968f\u865a\u62df\u673a\u8fdb\u7a0b\u7684\u542f\u52a8\u800c\u5b58\u5728\uff0c\u6709\u7684\u533a\u57df\u4f9d\u8d56\u7528\u6237\u7ebf\u7a0b\u7684\u542f\u52a8\u548c\u7ed3\u675f\u800c\u5efa\u7acb\u548c\u9500\u6bc1\u3002<\/p>\n

Java\u865a\u62df\u673a\u6240\u7ba1\u7406\u7684\u5185\u5b58\u5c06\u4f1a\u5305\u62ec\u4ee5\u4e0b\u51e0\u4e2a\u8fd0\u884c\u65f6\u6570\u636e\u533a\u57df\u3002
\n1.\u65b9\u6cd5\u533a\uff08\u7ebf\u7a0b\u5171\u4eab\uff09,JDK1.7\u4e2d\u5df2\u7ecf\u5f00\u59cb\u6539\u53d8\uff0cJDK1.8\u4e2d\u88ab\u5143\u7a7a\u95f4<\/strong>\u66ff\u4ee3
\n2.\u5806\uff08\u7ebf\u7a0b\u5171\u4eab\uff09
\n3.\u865a\u62df\u673a\u6808\uff08\u7ebf\u7a0b\u9694\u79bb\uff09
\n4.\u672c\u5730\u65b9\u6cd5\u6808\uff08\u7ebf\u7a0b\u9694\u79bb\uff09
\n5.\u7a0b\u5e8f\u8ba1\u6570\u5668\uff08\u7ebf\u7a0b\u9694\u79bb\uff09<\/p>\n

Java\u865a\u62df\u673a\u8fd0\u884c\u65f6\u6d89\u53ca\u5230\u7684\u53e6\u5916\u7684\u5185\u5b58\u533a\u57df
\n1.\u76f4\u63a5\u5185\u5b58<\/p>\n

\u4e8c\u3001\u65b9\u6cd5\u533a\uff08Method Area\uff09<\/h2>\n

\u8fd9\u662f\u4e00\u4e2a\u7ebf\u7a0b\u5171\u4eab\u7684\u6570\u636e\u533a\u57df\uff0c\u7528\u6765\u4fdd\u5b58\u5df2\u88ab\u865a\u62df\u673a\u52a0\u8f7d\u7684\u7c7b\u4fe1\u606f\u3001\u5e38\u91cf\u3001\u9759\u6001\u53d8\u91cf\u3001\u5373\u65f6\u7f16\u8bd1\u5668\u7f16\u8bd1\u540e\u7684\u4ee3\u7801\u7b49\u6570\u636e\u3002Java\u865a\u62df\u673a\u5c06\u65b9\u6cd5\u533a\u63cf\u8ff0\u4e3a\u5806\u7684\u4e00\u4e2a\u903b\u8f91\u90e8\u5206\uff08\u5728HotSpot\u4e2d\u5177\u4f53\u8868\u73b0\u4e3a\u5728\u65b9\u6cd5\u533a\u7684\u5185\u5b58\u7ba1\u7406\u548c\u5806\u4e2d\u7684\u5185\u5b58\u7ba1\u7406\u662f\u4e00\u5957\u65b9\u6848\uff0c\u5f53\u7136\u8fd9\u91cc\u7684\u4e00\u5957\u65b9\u6848\u5e76\u4e0d\u662f\u8bf4\u4ed6\u4eec\u662f\u4e00\u6a21\u4e00\u6837\u7684\uff09\uff0c\u4f46\u662f\u65b9\u6cd5\u533a\u6709\u4e00\u4e2a\u522b\u540d\u53eb\u505aNon-Heap(\u975e\u5806),\u5e94\u8be5\u662f\u4e3a\u4e86\u548c\u5806\u4f5c\u533a\u522b(Heap)\u3002<\/p>\n

\u5728HotSpot\u865a\u62df\u673a\u4e2d\uff0c\u65b9\u6cd5\u533a\u53c8\u88ab\u5f88\u591a\u4eba\u53eb\u505a\u201c\u6c38\u4e45\u4ee3\u201d\uff08Permanent Generation),\u672c\u8d28\u4e0a\u4e24\u8005\u5e76\u4e0d\u7b49\u4ef7\uff0c\u4ec5\u4ec5\u662fHotSpot\u56e2\u961f\u5c06GC\u5206\u4ee3\u6536\u96c6\u6269\u5c55\u81f3\u65b9\u6cd5\u533a\uff0c\u4e5f\u5c31\u662f\u4f7f\u7528\u6c38\u4e45\u4ee3\u6765\u5b9e\u73b0\u65b9\u6cd5\u533a\u3002\u8fd9\u6837\u5c31\u548cJava\u5806\u4f7f\u7528\u4e86\u540c\u6837\u7684GC\u5206\u4ee3\u6536\u96c6\u7b56\u7565\uff0c\u4e0d\u5fc5\u91cd\u65b0\u5b9e\u73b0\u4e00\u5957\u7ba1\u7406\u7b56\u7565\u3002\u5bf9\u4e8e\u5176\u4ed6\u865a\u62df\u673a\uff08\u5982BEA JRockit\u3001IBM J9\u7b49\uff09\u6765\u8bf4\u662f\u4e0d\u5b58\u5728\u6c38\u4e45\u4ee3\u7684\u3002<\/p>\n

\u7136\u800c\u5728\u5b9e\u9645\u5e94\u7528\u4e2d\uff0c\u4f7f\u7528\u6c38\u4e45\u4ee3\u6765\u5b9e\u73b0\u65b9\u6cd5\u533a\u5e76\u4e0d\u662f\u4e00\u4e2a\u597d\u7684\u9009\u62e9\uff0c\u66f4\u5bb9\u6613\u9047\u5230\u5185\u5b58\u6ea2\u51fa\u7684\u95ee\u9898\u3002\u5728JDK1.7\u4e2d\uff0c\u5df2\u7ecf\u5c06\u5b57\u7b26\u4e32\u5e38\u91cf\u6c60\u4ece\u6c38\u4e45\u4ee3\u79fb\u51fa\u4e86\u3002<\/p>\n

\n \u5b57\u7b26\u4e32\u5e38\u91cf\u6c60\u7684\u79fb\u51fa<\/strong>:JDK1.7 \u88ab\u8f6c\u79fb\u5230Java\u5806\u4e2d(Java Heap)\n<\/p><\/blockquote>\n

Java\u865a\u62df\u673a\u89c4\u8303\u5806\u65b9\u6cd5\u533a\u7684\u9650\u5236\u5bbd\u677e\uff0c\u65b9\u6cd5\u533a\u4e0d\u9700\u8981\u8fde\u7eed\u7684\u5185\u5b58\uff0c\u4e5f\u53ef\u4ee5\u4e0d\u5b9e\u73b0\u5783\u573e\u6536\u96c6\u3002\u4e8b\u5b9e\u4e0a\uff0c\u5783\u573e\u6536\u96c6\u7684\u9891\u7387\u5728\u8fd9\u4e2a\u533a\u57df\u662f\u5f88\u5c0f\u7684\uff0c\u4f46\u662f\u5e76\u4e0d\u662f\u6240\u6709\u5728\u6b64\u7684\u6570\u636e\u771f\u7684\u662f\u201c\u6c38\u4e45\u201d\u7684\uff0c\u8fd9\u4e2a\u533a\u57df\u7684\u5783\u573e\u56de\u6536\u76ee\u6807\u4e3b\u8981\u662f\u9488\u5bf9\u5e38\u91cf\u6c60\u7684\u56de\u6536\u548c\u5bf9\u7c7b\u578b\u7684\u5378\u8f7d\u3002\u8fd9\u4e2a\u533a\u57df\u7684\u56de\u6536\u6210\u7ee9\u96be\u4ee5\u4ee4\u4eba\u6ee1\u610f\u3002\u5f53\u65b9\u6cd5\u533a\u65e0\u6cd5\u6ee1\u8db3\u5185\u5b58\u5206\u914d\u7684\u9700\u6c42\u65f6\uff0c\u4f1a\u629b\u51faOutOfMemoryError\u7684\u9519\u8bef\u3002<\/p>\n

\n \u5173\u4e8e\u7c7b\u578b\u5378\u8f7d<\/strong>\uff0c\u6211\u7406\u89e3\u4e3a\u5728Java\u865a\u62df\u673a\u8fd0\u884c\u65f6\uff0c\u4f1a\u5c06\u7c7b\u4fe1\u606f\u52a0\u8f7d\u5230\u65b9\u6cd5\u533a\uff0c\u5f53\u67d0\u4e9b\u7c7b\u4e0d\u4f1a\u7528\u5230\u7684\u65f6\u5019(unreachable)\uff0c\u5c31\u4f1a\u4ece\u65b9\u6cd5\u533a\u4e2d\u5378\u8f7d\u8fd9\u4e2a\u7c7b\u4ee5\u8282\u7701\u5185\u5b58),\u5177\u4f53\u53ef\u4ee5\u770b\u4e0b\u9762\u7684\u6587\u7ae0
\n 1.Java\u7c7b\u52a0\u8f7d\u539f\u7406\u89e3\u6790<\/a>
\n 2.Java\u865a\u62df\u673a\u7c7b\u578b\u5378\u8f7d\u548c\u7c7b\u578b\u66f4\u65b0\u89e3\u6790<\/a>\n<\/p><\/blockquote>\n

\u5728\u65b9\u6cd5\u533a\u4e2d\u6709\u4e00\u5757\u53eb\u505a\u8fd0\u884c\u65f6\u5e38\u91cf\u6c60(Runtime Constant Pool)\u7684\u533a\u57df\uff0cClass\u6587\u4ef6\u4e2d\u9664\u4e86\u6709\u7c7b\u7684\u7248\u672c\u3001\u5b57\u6bb5\u3001\u65b9\u6cd5\u3001\u63a5\u53e3\u7b49\u63cf\u8ff0\u4fe1\u606f\u5916\uff0c\u8fd8\u6709\u4e00\u9879\u4fe1\u606f\u5e38\u91cf\u6c60(Constant Pool Table),\u7528\u4e8e\u5b58\u653e\u7f16\u8bd1\u671f\u751f\u6210\u7684\u5404\u79cd\u5b57\u9762\u91cf\u548c\u7b26\u53f7\u5f15\u7528\uff0c\u8fd9\u90e8\u5206\u5728\u7c7b\u52a0\u8f7d\u5230\u65b9\u6cd5\u533a\u540e\u8fdb\u5165\u8fd0\u884c\u65f6\u5e38\u91cf\u6c60\u3002<\/p>\n

\n \u5b57\u9762\u91cf(literal):<\/strong> \u6211\u7684\u7406\u89e3\u4e3a\u5b57\u9762\u91cf\u6307\u7684\u51e0\u79cd\u57fa\u672c\u7c7b\u578b\u3002int,boolean,char,float,double,string,long,byte,null
\n \u5176\u4e2dfloat\u548cdouble\u7edf\u79f0\u4e3afloating-point literal,\u5f53\u4f60\u521b\u5efa\u4e00\u4e2a\u6d6e\u70b9\u6570\u65f6\uff0c\u9ed8\u8ba4\u7684\u662fdouble\u7c7b\u578b\u3002\u8fd9\u4e5f\u662f\u4e3a\u4ec0\u4e48float a = 0.1;\u662f\u9519\u8bef\u7684\uff0c\u4f60\u5f97float a = (float)0.1;
\n \u5177\u4f53\u5b57\u9762\u91cf\u7684\u5185\u5bb9\u53ef\u4ee5\u53c2\u8003\u8fd9\u91cc:Java Literals<\/a>
\n \u7b26\u53f7\u5f15\u7528:<\/strong> \u7b26\u53f7\u5f15\u7528\u662f\u4e00\u4e2a\u5b57\u7b26\u4e32\uff0c\u5b83\u7ed9\u51fa\u4e86\u88ab\u5f15\u7528\u7684\u5185\u5bb9\u7684\u540d\u5b57\u5e76\u4e14\u53ef\u80fd\u4f1a\u5305\u542b\u4e00\u4e9b\u5176\u4ed6\u5173\u4e8e\u8fd9\u4e2a\u88ab\u5f15\u7528\u9879\u7684\u4fe1\u606f\u2014\u2014\u8fd9\u4e9b\u4fe1\u606f\u5fc5\u987b\u8db3\u4ee5\u552f\u4e00\u7684\u8bc6\u522b\u4e00\u4e2a\u7c7b\u3001\u5b57\u6bb5\u3001\u65b9\u6cd5\u3002\u8fd9\u6837\uff0c\u5bf9\u4e8e\u5176\u4ed6\u7c7b\u7684\u7b26\u53f7\u5f15\u7528\u5fc5\u987b\u7ed9\u51fa\u7c7b\u7684\u5168\u540d\u3002\u5bf9\u4e8e\u5176\u4ed6\u7c7b\u7684\u5b57\u6bb5\uff0c\u5fc5\u987b\u7ed9\u51fa\u7c7b\u540d\u3001\u5b57\u6bb5\u540d\u4ee5\u53ca\u5b57\u6bb5\u63cf\u8ff0\u7b26\u3002\u5bf9\u4e8e\u5176\u4ed6\u7c7b\u7684\u65b9\u6cd5\u7684\u5f15\u7528\u5fc5\u987b\u7ed9\u51fa\u7c7b\u540d\u3001\u65b9\u6cd5\u540d\u4ee5\u53ca\u65b9\u6cd5\u7684\u63cf\u8ff0\u7b26\u3002
\n JVM\u4e2d\u7684\u76f4\u63a5\u5f15\u7528\u548c\u7b26\u53f7\u5f15\u7528<\/a><\/p>\n

\u5173\u4e8e\u5e38\u91cf\u6c60\u4e2d\u7684\u4e00\u4e9b\u7ec6\u8282\u53ef\u4ee5\u770b\u8fd9\u91cc\u7684\u5bf9\u6bd4
\n Java\u5e38\u91cf\u6c60<\/a><\/p>\n

\u65b9\u6cd5\u533a\u7684\u53d8\u8fc1<\/strong>:
\n 1\u3001JDK1.2 ~ JDK6
\n \u5728 JDK1.2 ~ JDK6 \u7684\u5b9e\u73b0\u4e2d\uff0cHotSpot \u4f7f\u7528\u6c38\u4e45\u4ee3\u5b9e\u73b0\u65b9\u6cd5\u533a\uff1bHotSpot \u4f7f\u7528 GC \u5206\u4ee3\u5b9e\u73b0\u65b9\u6cd5\u533a\u5e26\u6765\u4e86\u5f88\u5927\u4fbf\u5229\uff1b<\/p>\n

2\u3001JDK7
\n \u7531\u4e8e GC \u5206\u4ee3\u6280\u672f\u7684\u5f71\u54cd\uff0c\u4f7f\u4e4b\u8bb8\u591a\u4f18\u79c0\u7684\u5185\u5b58\u8c03\u8bd5\u5de5\u5177\u65e0\u6cd5\u5728 Oracle HotSpot\u4e4b\u4e0a\u8fd0\u884c\uff0c\u5fc5\u987b\u5355\u72ec\u5904\u7406\uff1b\u5e76\u4e14 Oracle \u540c\u65f6\u6536\u8d2d\u4e86 BEA \u548c Sun \u516c\u53f8\uff0c\u540c\u65f6\u62e5\u6709 JRockit \u548c HotSpot\uff0c\u5728\u5c06 JRockit \u8bb8\u591a\u4f18\u79c0\u7279\u6027\u79fb\u690d\u5230 HotSpot \u65f6\u7531\u4e8e GC \u5206\u4ee3\u6280\u672f\u9047\u5230\u4e86\u79cd\u79cd\u56f0\u96be\uff0c\u6240\u4ee5\u4ece JDK7 \u5f00\u59cb Oracle HotSpot \u5f00\u59cb\u79fb\u9664\u6c38\u4e45\u4ee3\u3002
\n JDK7\u4e2d\u7b26\u53f7\u8868\u88ab\u79fb\u52a8\u5230 Native Heap\u4e2d\uff0c\u5b57\u7b26\u4e32\u5e38\u91cf\u548c\u7c7b\u5f15\u7528\u88ab\u79fb\u52a8\u5230 Java Heap\u4e2d\u3002<\/p>\n

3\u3001JDK8
\n \u5728 JDK8 \u4e2d\uff0c\u6c38\u4e45\u4ee3\u5df2\u5b8c\u5168\u88ab\u5143\u7a7a\u95f4<\/strong>(Meatspace)\u6240\u53d6\u4ee3\u3002
\n \u5f15\u7528:Java \u5185\u5b58\u4e4b\u65b9\u6cd5\u533a\u548c\u8fd0\u884c\u65f6\u5e38\u91cf\u6c60<\/a>\n<\/p><\/blockquote>\n

##\u4e09\u3001\u5806\uff08Java Heap)
\n\u548c\u65b9\u6cd5\u533a\u4e00\u6837\uff0c\u8fd9\u4e5f\u662f\u4e00\u4e2a\u7ebf\u7a0b\u5171\u4eab\u7684\u6570\u636e\u533a\u57df\u3002\u5728java\u865a\u62df\u673a\u6267\u884cJava\u7a0b\u5e8f\u65f6\uff0c\u5b83\u5360\u636e\u4e86\u5927\u591a\u6570\u7684\u5185\u5b58\uff0c\u51e0\u4e4e\u6240\u6709\u7684\u5bf9\u8c61\u7684\u5b58\u50a8\u90fd\u662f\u5728\u8fd9\u4e2a\u533a\u57df\u3002\u4e3a\u4ec0\u4e48\u8bf4\u51e0\u4e4e\u5462\uff1f\u56e0\u4e3a\u968f\u7740JIT\u7f16\u8bd1\u5668\u7684\u53d1\u5c55\u548c\u9003\u9038\u5206\u6790\u6280\u672f\u7684\u9010\u6e10\u6210\u719f\uff0c\u6808\u4e0a\u5206\u914d\uff0c\u6807\u91cf\u66ff\u6362\u4f18\u5316\u6280\u672f\u5c06\u4f1a\u5bfc\u81f4\u4e00\u7cfb\u5217\u5fae\u5999\u7684\u53d8\u5316\u53d1\u751f\u3002<\/p>\n

\n JIT\u7f16\u8bd1\u5668:<\/strong>\u53ca\u65f6\u7f16\u8bd1\u5668\uff08Just-In-Time compiler)
\n \u9003\u9038\u5206\u6790\u6280\u672f:<\/strong>\u5168\u90e8\u53d8\u91cf\u8d4b\u503c\uff0c\u65b9\u6cd5\u8fd4\u56de\u503c\uff0c\u5b9e\u4f8b\u5f15\u7528\u4f20\u9012\u4e09\u79cd\u60c5\u51b5\u4f1a\u53d1\u751f\u6307\u9488\u9003\u9038\uff0c\u5982\u679c\u5728\u65b9\u6cd5\u5185\u65b0\u5efa\u5bf9\u8c61\uff0c\u5e76\u4e14\u8fd9\u4e2a\u5bf9\u8c61\u6ca1\u6709\u79bb\u5f00\u8fc7\u8fd9\u4e2a\u65b9\u6cd5\uff0c\u5219\u8fd9\u4e2a\u5bf9\u8c61\u6ca1\u6709\u5fc5\u8981\u5728\u5806\u4e2d\u5206\u914d\u5185\u5b58\uff0c\u76f4\u63a5\u5728Java\u865a\u62df\u673a\u6808\u4e2d\u5206\u914d\u5185\u5b58\uff0c\u7701\u53bb\u4e86\u5728\u5806\u4e2d\u5206\u914d\u5185\u5b58\u5806GC\u9020\u6210\u7684\u538b\u529b\u3002
\n \u4ec0\u4e48\u662f\u9003\u9038\u5206\u6790(Escape Analysis)?<\/a>
\n \u6808\u4e0a\u5206\u914d:<\/strong>\u5c06\u5bf9\u8c61\u5728\u6808\u4e0a\u5206\u914d\u5185\u5b58
\n \u6807\u91cf\u66ff\u6362\u4f18\u5316\u6280\u672f:<\/strong>Java\u4e2d\u7684\u539f\u59cb\u7c7b\u578b\u65e0\u6cd5\u518d\u5206\u89e3\uff0c\u53ef\u4ee5\u770b\u4f5c\u6807\u91cf\uff08scalar\uff09\uff1b\u6307\u5411\u5bf9\u8c61\u7684\u5f15\u7528\u4e5f\u662f\u6807\u91cf\uff1b\u800c\u5bf9\u8c61\u672c\u8eab\u5219\u662f\u805a\u5408\u91cf\uff08aggregate\uff09\uff0c\u53ef\u4ee5\u5305\u542b\u4efb\u610f\u4e2a\u6570\u7684\u6807\u91cf\u3002\u5982\u679c\u628a\u4e00\u4e2aJava\u5bf9\u8c61\u62c6\u6563\uff0c\u5c06\u5176\u6210\u5458\u53d8\u91cf\u6062\u590d\u4e3a\u5206\u6563\u7684\u53d8\u91cf\uff0c\u8fd9\u5c31\u53eb\u505a\u6807\u91cf\u66ff\u6362\u3002\u62c6\u6563\u540e\u7684\u53d8\u91cf\u4fbf\u53ef\u4ee5\u88ab\u5355\u72ec\u5206\u6790\u4e0e\u4f18\u5316\uff0c\u53ef\u4ee5\u5404\u81ea\u5206\u522b\u5728\u6d3b\u52a8\u8bb0\u5f55\uff08\u6808\u5e27\u6216\u5bc4\u5b58\u5668\uff09\u4e0a\u5206\u914d\u7a7a\u95f4\uff1b\u539f\u672c\u7684\u5bf9\u8c61\u5c31\u65e0\u9700\u6574\u4f53\u5206\u914d\u7a7a\u95f4\u4e86\u3002
\n HotSpot 17.0-b12\u7684\u9003\u9038\u5206\u6790\/\u6807\u91cf\u66ff\u6362\u7684\u4e00\u4e2a\u6f14\u793a<\/a>\n<\/p><\/blockquote>\n

Java\u5806\u662f\u5783\u573e\u6536\u96c6\u5668\u7ba1\u7406\u7684\u4e3b\u8981\u533a\u57df\uff0c\u53c8\u6210”GC\u5806”(Garbage Collected Heap)\u3002<\/p>\n

\u4ece\u5185\u5b58\u56de\u6536\u7684\u89d2\u5ea6\u6765\u770b\uff0c\u73b0\u5728\u6536\u96c6\u5668\u57fa\u672c\u90fd\u91c7\u7528\u5206\u4ee3\u6536\u96c6\u7b97\u6cd5\u3002\u6240\u4ee5Java\u5806\u53ef\u4ee5\u7ec6\u5206\u4e3a\uff1a\u65b0\u751f\u4ee3\u548c\u8001\u5e74\u4ee3\uff0c\u518d\u7ec6\u5206\u4e00\u70b9\uff0c\u53ef\u4ee5\u5206\u4e3aEden\u7a7a\u95f4J\uff0cFrom Survivor\u7a7a\u95f4\uff0cto Survivor\u7a7a\u95f4<\/p>\n

\u4ece\u5185\u5b58\u5206\u914d\u7684\u89d2\u5ea6\u6765\u770b\uff0cJava\u5806\u53ef\u80fd\u5212\u5206\u51fa\u591a\u4e2a\u7ebf\u7a0b\u79c1\u6709\u7684\u5206\u914d\u7f13\u51b2\u533a\uff08Thread Local Allocation Buffer,TLAB)<\/p>\n

Java\u5806\u7684\u5185\u5b58\u4e0d\u8981\u6c42\u5728\u7a7a\u95f4\u4e0a\u662f\u8fde\u7eed\u7684\uff0c\u53ea\u8981\u5728\u903b\u8f91\u4e0a\u8fde\u7eed\u5373\u53ef\u3002<\/p>\n

\u56db\u3001\u865a\u62df\u673a\u6808\uff08Java Virtual Machine Stack\uff09<\/h2>\n

\u7ebf\u7a0b\u79c1\u6709\uff0c\u548c\u7ebf\u7a0b\u7684\u751f\u547d\u5468\u671f\u76f8\u540c\u3002\u865a\u62df\u673a\u6808\u63cf\u8ff0\u7684\u662fJava\u65b9\u6cd5\u6267\u884c\u7684\u5185\u5b58\u6a21\u578b\uff1a\u6bcf\u4e2a\u65b9\u6cd5\u5728\u6267\u884c\u7684\u540c\u65f6\uff0c\u90fd\u4f1a\u521b\u5efa\u4e00\u4e2a\u6808\u5e27\uff08Stack Frame\uff09\uff0c\u7528\u4e8e\u5b58\u50a8\u5c40\u90e8\u53d8\u91cf\u8868\uff0c\u64cd\u4f5c\u6570\u6808\uff0c\u52a8\u6001\u94fe\u63a5\uff0c\u65b9\u6cd5\u51fa\u53e3\u7b49\u4fe1\u606f\u3002\u6bcf\u4e00\u4e2a\u65b9\u6cd5\u4ece\u8c03\u7528\u5230\u6267\u884c\u5b8c\u6210\u7684\u8fc7\u7a0b\uff0c\u5c31\u5bf9\u5e94\u7740\u4e00\u4e2a\u6808\u5e27\u4ece\u865a\u62df\u673a\u6808\u5165\u6808\u5230\u51fa\u6808\u7684\u8fc7\u7a0b\u3002<\/p>\n

\u5c40\u90e8\u53d8\u91cf\u8868\u4e2d\u5b58\u653e\u4e86\u7f16\u8bd1\u533a\u53ef\u77e5\u7684\u5404\u79cd\u57fa\u672c\u6570\u636e\u7c7b\u578b\uff08boolean,byte,char,int,float,double,long,short)\u3001\u5bf9\u8c61\u5f15\u7528(reference\uff0c\u5b83\u4e0d\u7b49\u540c\u4e8e\u5bf9\u8c61\u672c\u8eab\uff0c\u53ef\u80fd\u662f\u4e00\u4e2a\u6307\u5411\u5bf9\u8c61\u8d77\u59cb\u5730\u5740\u7684\u5f15\u7528\u6307\u9488\uff0c\u4e5f\u53ef\u80fd\u662f\u6307\u5411\u4e00\u4e2a\u4ee3\u8868\u5bf9\u8c61\u7684\u53e5\u67c4\u548c\u5176\u4ed6\u4e0e\u6b64\u5bf9\u8c61\u76f8\u5173\u7684\u4f4d\u7f6e)<\/p>\n

64\u4f4d\u7684double\u548clong\u4f1a\u5360\u636e\u4e24\u4e2a\u5c40\u90e8\u53d8\u91cf\u7a7a\u95f4(slot),\u5176\u4f59\u6570\u636e\u7c7b\u578b\u53ea\u5360\u4e00\u4e2a\u3002\u5c40\u90e8\u53d8\u91cf\u8868\u6240\u9700\u7684\u7a7a\u95f4\u5728\u7f16\u8bd1\u671f\u95f4\u5206\u914d\u5b8c\u6210\uff0c\u5f53\u8fdb\u5165\u4e00\u4e2a\u65b9\u6cd5\u65f6\uff0c\u8fd9\u4e2a\u65b9\u6cd5\u9700\u8981\u5728\u5e27\u4e2d\u5206\u914d\u591a\u5c11\u5c40\u90e8\u53d8\u91cf\u7a7a\u95f4\u5b8c\u5168\u65f6\u786e\u5b9a\u7684\u3002<\/p>\n

\u5728Java\u865a\u62df\u673a\u4e2d\uff0c\u5bf9\u8fd9\u4e2a\u533a\u57df\u89c4\u5b9a\u4e86\u4e24\u4e2d\u5f02\u5e38\u60c5\u51b5\u30021.\u5982\u679c\u7ebf\u7a0b\u8bf7\u6c42\u7684\u6808\u6df1\u5ea6\u5927\u4e8e\u865a\u62df\u673a\u6240\u5141\u8bb8\u7684\u6df1\u5ea6\uff0c\u5c06\u629b\u51faStackOverflowError;\u5982\u679c\u865a\u62df\u673a\u6808\u53ef\u4ee5\u52a8\u6001\u6269\u5c55\uff0c\u5728\u6269\u5c55\u65f6\u65e0\u6cd5\u7533\u8bf7\u5230\u8db3\u591f\u7684\u5185\u5b58\uff0c\u5219\u4f1a\u629b\u51faOutOfMemoryError\u5f02\u5e38\u3002<\/p>\n

\u4e94\u3001\u672c\u5730\u65b9\u6cd5\u6808\uff08Native Method Stack\uff09<\/h2>\n

\u8ddf\u865a\u62df\u673a\u6808\u7c7b\u4f3c,\u4e0d\u8fc7\u662f\u7528\u6765\u5b58\u50a8\u672c\u5730\u65b9\u6cd5\u7684\u3002<\/p>\n

\u516d\u3001\u7a0b\u5e8f\u8ba1\u6570\u5668\uff08Program Counter Register\uff09<\/h2>\n

\u7ebf\u7a0b\u79c1\u6709\uff0c\u8fd9\u662f\u4e00\u5757\u8f83\u5c0f\u7684\u5185\u5b58\u7a7a\u95f4\uff0c\u53ef\u4ee5\u770b\u4f5c\u662f\u5f53\u524d\u7ebf\u7a0b\u6240\u6267\u884c\u7684\u5b57\u8282\u7801\u7684\u884c\u53f7\u6307\u793a\u5668\u3002\u5b57\u8282\u7801\u89e3\u91ca\u5668\u5de5\u4f5c\u65f6\u5c31\u662f\u901a\u8fc7\u6539\u53d8\u8fd9\u4e2a\u8ba1\u6570\u5668\u7684\u503c\u6765\u9009\u53d6\u4e0b\u4e00\u6761\u9700\u8981\u6267\u884c\u7684\u5b57\u8282\u7801\u6307\u4ee4\uff0c\u5206\u652f\uff0c\u5faa\u73af\uff0c\u8df3\u8f6c\uff0c\u5f02\u5e38\u5904\u7406\uff0c\u7ebf\u7a0b\u6062\u590d\u7b49\u57fa\u7840\u529f\u80fd\u90fd\u4f9d\u8d56\u8fd9\u4e2a\u3002<\/p>\n

\u6bcf\u4e2a\u7ebf\u7a0b\u90fd\u9700\u8981\u4e00\u4e2a\u72ec\u7acb\u7684\u7a0b\u5e8f\u8ba1\u6570\u5668\uff0c\u4fdd\u8bc1\u5404\u6761\u7ebf\u7a0b\u6267\u884c\u4e2d\u4e0d\u4f1a\u6df7\u4e71\u3002<\/p>\n

\u5982\u679c\u5f53\u524d\u6267\u884c\u7684\u65f6Java\u65b9\u6cd5\uff0c\u8fd9\u4e2a\u8ba1\u6570\u5668\u8bb0\u5f55\u7684\u6b63\u662f\u5f53\u524d\u6b63\u5728\u6267\u884c\u7684\u865a\u62df\u673a\u5b57\u8282\u7801\u6307\u4ee4\u7684\u4f4d\u7f6e\uff0c\u5982\u679c\u6267\u884c\u7684\u65f6Native\u65b9\u6cd5\uff0c\u8fd9\u4e2a\u8ba1\u6570\u5668\u4e3a\u7a7a\u3002\u6b64\u533a\u57df\u65f6\u552f\u4e00\u4e00\u4e2a\u5728Java\u865a\u62df\u673a\u89c4\u8303\u4e2d\u6ca1\u89c4\u5b9a\u4efb\u4f55OutOfMemoryError\u7684\u533a\u57df\u3002<\/p>\n

\u4e03\u3001\u76f4\u63a5\u5185\u5b58\uff08Direct Memory\uff09<\/h2>\n

\u5728JDK1.4\u4e2d\u52a0\u5165\u4e86NIO(New Input\/Output)\u7c7b\uff0c\u5f15\u5165\u4e86\u4e00\u79cd\u57fa\u4e8e\u901a\u9053(Channel)\u548c\u7f13\u51b2\u533a(Buffer)\u7684I\/O\u65b9\u5f0f\uff0c\u5b83\u53ef\u4ee5\u4f7f\u7528Native\u51fd\u6570\u5e93\u76f4\u63a5\u5206\u914d\u5806\u5916\u5185\u5b58\uff0c\u7136\u540e\u901a\u8fc7\u4e00\u4e2a\u5b58\u50a8\u5728Java\u5806\u4e2d\u7684DirectByteBuffer\u5bf9\u8c61\u4f5c\u4e3a\u8fd9\u4e2a\u5185\u5b58\u7684\u5f15\u7528\u8fdb\u884c\u64cd\u4f5c\u3002\u8fd9\u6837\u80fd\u5728\u4e00\u4e9b\u573a\u666f\u4e2d\u663e\u8457\u63d0\u9ad8\u6027\u80fd\uff0c\u56e0\u4e3a\u907f\u514d\u4e86\u9891\u7e41\u7684\u5728Java\u5806\u4e2d\u548cNative\u5806\u4e2d\u590d\u5236\u6570\u636e\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"

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