{"id":10008399,"date":"2024-02-24T14:02:36","date_gmt":"2024-02-24T06:02:36","guid":{"rendered":"https:\/\/blog.itmax.cn\/?p=10008399"},"modified":"2024-02-24T14:02:36","modified_gmt":"2024-02-24T06:02:36","slug":"%e6%b7%b1%e5%85%a5%e6%b5%85%e5%87%bajvm%ef%bc%88%e4%b8%83%ef%bc%89%e4%b9%8b%e6%89%a7%e8%a1%8c%e5%bc%95%e6%93%8e%e7%9a%84%e8%a7%a3%e9%87%8a%e6%89%a7%e8%a1%8c%e4%b8%8e%e7%bc%96%e8%af%91%e6%89%a7","status":"publish","type":"post","link":"https:\/\/itmax.cn\/?p=10008399","title":{"rendered":"\u6df1\u5165\u6d45\u51faJVM\uff08\u4e03\uff09\u4e4b\u6267\u884c\u5f15\u64ce\u7684\u89e3\u91ca\u6267\u884c\u4e0e\u7f16\u8bd1\u6267\u884c"},"content":{"rendered":"<p>\u672c\u7bc7\u6587\u7ae0\u56f4\u7ed5\u6267\u884c\u5f15\u64ce\uff0c<strong>\u6df1\u5165\u6d45\u51fa\u7684\u89e3\u6790\u6267\u884c\u5f15\u64ce\u4e2d\u89e3\u91ca\u5668\u4e0e\u7f16\u8bd1\u5668\u7684\u89e3\u91ca\u6267\u884c\u548c\u7f16\u8bd1\u6267\u884c\u3001\u6267\u884c\u5f15\u64ce\u7684\u6267\u884c\u65b9\u5f0f\u3001\u9003\u9038\u5206\u6790\u5e26\u6765\u7684\u6808\u4e0a\u5206\u914d\u3001\u9501\u6d88\u9664\u3001\u6807\u91cf\u66ff\u6362\u7b49\u4f18\u5316\u4ee5\u53ca\u5373\u65f6\u7f16\u8bd1\u5668\u7f16\u8bd1\u5bf9\u70ed\u70b9\u4ee3\u7801\u7684\u63a2\u6d4b<\/strong><\/p>\n<h3>\u6267\u884c\u5f15\u64ce<\/h3>\n<blockquote><p>hotspot\u6267\u884c\u5f15\u64ce\u7ed3\u6784\u56fe<\/p><\/blockquote>\n<p>\u6267\u884c\u5f15\u64ce\u5206\u4e3a\u89e3\u91ca\u5668\u3001JIT\u5373\u65f6\u7f16\u8bd1\u5668\u4ee5\u53ca\u5783\u573e\u6536\u96c6\u5668<\/p>\n<p><strong>\u6267\u884c\u5f15\u64ce\u901a\u8fc7\u89e3\u91ca\u5668\/\u5373\u65f6\u7f16\u8bd1\u5668\u5c06\u5b57\u8282\u7801\u6307\u4ee4\u89e3\u91ca\/\u7f16\u8bd1\u4e3a\u5bf9\u5e94OS\u4e0a\u7684\u7684\u673a\u5668\u6307\u4ee4<\/strong><\/p>\n<p><img loading=\"lazy\" decoding=\"async\" width=\"643\" height=\"353\" referrerpolicy=\"no-referrer\" src=\"https:\/\/segmentfault.com\/img\/bVdbwNu\" alt=\"image-20210430191033833.png\" title=\"image-20210430191033833.png\"><\/p>\n<p>\u672c\u7bc7\u6587\u7ae0\u4e3b\u8981\u56f4\u7ed5\u89e3\u91ca\u5668\u4e0e\u5373\u65f6\u7f16\u8bd1\u5668\uff0c\u5783\u573e\u6536\u96c6\u5668\u5c06\u5728\u540e\u7eed\u6587\u7ae0\u89e3\u6790<\/p>\n<h3>\u89e3\u91ca\u6267\u884c\u4e0e\u7f16\u8bd1\u6267\u884c<\/h3>\n<p>Java\u865a\u62df\u673a\u6267\u884c\u5f15\u64ce\u5728\u6267\u884cJava\u4ee3\u7801\u65f6\uff0c\u4f1a\u6709\u4e24\u79cd\u9009\u62e9:<em>\u89e3\u91ca\u6267\u884c\u548c\u7f16\u8bd1\u6267\u884c<\/em><\/p>\n<p>\u89e3\u91ca\u6267\u884c\uff1a\u901a\u8fc7<strong>\u5b57\u8282\u7801\u89e3\u91ca\u5668\u628a\u5b57\u8282\u7801\u89e3\u6790\u4e3a\u673a\u5668\u8bed\u8a00<\/strong>\u6267\u884c<\/p>\n<p>\u7f16\u8bd1\u6267\u884c\uff1a\u901a\u8fc7<strong>\u5373\u65f6\u7f16\u8bd1\u5668\u4ea7\u751f\u672c\u5730\u4ee3\u7801<\/strong>\u6267\u884c<\/p>\n<p>Class\u6587\u4ef6\u4e2d\u7684\u4ee3\u7801\u5230\u5e95\u662f\u89e3\u91ca\u6267\u884c\u8fd8\u662f\u7f16\u8bd1\u6267\u884c\u53ea\u6709Java\u865a\u62df\u673a\u81ea\u5df1\u624d\u80fd\u5224\u65ad\u51c6\u786e<\/p>\n<blockquote><p>\u7f16\u8bd1\u8fc7\u7a0b<\/p><\/blockquote>\n<p><img decoding=\"async\" width=\"723\" height=\"369\" referrerpolicy=\"no-referrer\" src=\"https:\/\/segmentfault.com\/img\/bVdbwNv\" alt=\"image-20201113160400365.png\" title=\"image-20201113160400365.png\" loading=\"lazy\"><\/p>\n<p>\u7f16\u8bd1\u6d41\u7a0b\u5728\u524d\u4e00\u7bc7\u6587\u7ae0<a target=\"_blank\" href=\"https:\/\/link.segmentfault.com\/?enc=yp8jN7xBjrWaLHJC90%2Furw%3D%3D.e9AS7zuv7DXp7ZbEosAl9cZcXAOWSZ7%2FheUnT7kUI93tSm7hBqeWIm%2FzmiBqKwGz\" rel=\"noopener noreferrer\">\u6df1\u5165\u6d45\u51faJVM\u4e4b\u524d\u7aef\u7f16\u8bd1\u8fc7\u7a0b\u4e0e\u8bed\u6cd5\u7cd6\u539f\u7406<\/a>\u5df2\u7ecf\u8bf4\u660e\uff0c\u5728\u672c\u7bc7\u6587\u7ae0\u4e2d\u4e0d\u518d\u6982\u8ff0<\/p>\n<p>\u7ecf\u5178\u7f16\u8bd1\u539f\u7406: <strong>1.\u5bf9\u6e90\u7801\u8fdb\u884c\u8bcd\u6cd5\uff0c\u8bed\u6cd5\u5206\u6790\u5904\u7406 2.\u628a\u6e90\u7801\u8f6c\u6362\u4e3a\u62bd\u8c61\u8bed\u6cd5\u6811<\/strong><\/p>\n<p><strong>javac\u7f16\u8bd1\u5668\u5b8c\u6210\u4e86\u5bf9\u6e90\u7801\u8fdb\u884c\u8bcd\u6cd5\uff0c\u8bed\u6cd5\u5206\u6790\u5904\u7406\u4e3a\u62bd\u8c61\u8bed\u6cd5\u6811\uff0c\u518d\u904d\u5386\u62bd\u8c61\u8bed\u6cd5\u6811\u751f\u6210\u7ebf\u6027\u5b57\u8282\u7801\u6307\u4ee4\u6d41\u7684\u8fc7\u7a0b<\/strong><\/p>\n<p>\u5269\u4e0b\u7684\u6307\u4ee4\u6d41\u6709\u4e24\u79cd\u65b9\u5f0f\u6267\u884c<\/p>\n<ol>\n<li>\u7531\u865a\u62df\u673a\u5185\u90e8\u7684\u5b57\u8282\u7801\u89e3\u91ca\u5668\u53bb\u5c06\u5b57\u8282\u7801\u6307\u4ee4\u8fdb\u884c\u9010\u884c\u89e3\u91ca \uff08\u89e3\u91ca\u6267\u884c\uff09<\/li>\n<li>\u6216\u4f18\u5316\u5668\uff08\u5373\u65f6\u7f16\u8bd1\u5668\uff09\u4f18\u5316\u4ee3\u7801\u6700\u540e\u751f\u6210\u76ee\u6807\u4ee3\u7801 \uff08\u7f16\u8bd1\u6267\u884c\uff09<\/li>\n<\/ol>\n<blockquote><p>\u6267\u884c\u5f15\u64ce\u6d41\u7a0b\u56fe<\/p><\/blockquote>\n<p><img decoding=\"async\" width=\"723\" height=\"397\" referrerpolicy=\"no-referrer\" src=\"https:\/\/segmentfault.com\/img\/bVdbwNw\" alt=\"image-20210430150736000.png\" title=\"image-20210430150736000.png\" loading=\"lazy\"><\/p>\n<h3>\u89e3\u91ca\u5668\u4e0e\u7f16\u8bd1\u5668<\/h3>\n<blockquote><p>\u89e3\u91ca\u5668<\/p><\/blockquote>\n<p><strong>\u4f5c\u7528: \u5bf9\u5b57\u8282\u7801\u6307\u4ee4\u9010\u884c\u89e3\u91ca<\/strong><\/p>\n<p>\u4f18\u70b9: \u7a0b\u5e8f\u542f\u52a8\uff0c\u89e3\u91ca\u5668\u7acb\u5373\u89e3\u91ca\u6267\u884c<\/p>\n<p>\u7f3a\u70b9: \u4f4e\u6548<\/p>\n<blockquote><p>\u5373\u65f6\u7f16\u8bd1\u5668 (just in time compiler)<\/p><\/blockquote>\n<p>Java\u4e2d\u7684&#8221;\u7f16\u8bd1\u671f&#8221;\u4e0d\u786e\u5b9a<\/p>\n<ul>\n<li>\u53ef\u80fd\u8bf4\u7684\u662f\u6267\u884cjavac\u6307\u4ee4\u65f6\u7684\u524d\u7aef\u7f16\u8bd1\u5668 (.java-&gt;.class)<\/li>\n<li>\u4e5f\u53ef\u80fd\u662f\u540e\u7aef\u7f16\u8bd1\u5668JIT (\u5b57\u8282\u6307\u4ee4-&gt;\u673a\u5668\u6307\u4ee4)<\/li>\n<li>\u8fd8\u53ef\u80fd\u662fAOT\u7f16\u8bd1\u5668(\u9759\u6001\u63d0\u524d\u7f16\u8bd1\u5668) (.java-&gt;\u673a\u5668\u6307\u4ee4)<\/li>\n<\/ul>\n<p><strong>\u4f5c\u7528: \u5c06\u65b9\u6cd5\u7f16\u8bd1\u6210\u673a\u5668\u7801\u7f13\u5b58\u5230\u65b9\u6cd5\u533a\uff0c\u6bcf\u6b21\u8c03\u7528\u8be5\u65b9\u6cd5\u6267\u884c\u7f16\u8bd1\u540e\u7684\u673a\u5668\u7801<\/strong><\/p>\n<p>\u4f18\u70b9: \u5373\u65f6\u7f16\u8bd1\u5668\u628a\u4ee3\u7801\u7f16\u8bd1\u6210\u672c\u5730\u673a\u5668\u7801\uff0c\u6267\u884c\u6548\u7387\u9ad8\uff0c\u9ad8\u6548<\/p>\n<p>\u7f3a\u70b9: \u7a0b\u5e8f\u542f\u52a8\u65f6\uff0c\u9700\u8981\u5148\u7f16\u8bd1\u518d\u6267\u884c<\/p>\n<h3>\u6267\u884c\u5f15\u64ce\u6267\u884c\u65b9\u5f0f<\/h3>\n<p>\u6267\u884c\u5f15\u64ce\u6267\u884c\u65b9\u5f0f\u5927\u81f4\u5206\u4e3a3\u79cd<\/p>\n<p><code>-Xint<\/code>: \u5b8c\u5168\u91c7\u7528\u89e3\u91ca\u5668\u6267\u884c<\/p>\n<p><code>-Xcomp<\/code>: \u4f18\u5148\u91c7\u7528\u5373\u65f6\u7f16\u8bd1\u5668\u6267\u884c\uff0c\u89e3\u91ca\u5668\u662f\u540e\u5907\u9009\u62e9<\/p>\n<p><code>-Xmixed<\/code>: \u91c7\u7528\u89e3\u91ca\u5668 + \u5373\u65f6\u7f16\u8bd1\u5668<\/p>\n<p><img decoding=\"async\" width=\"723\" height=\"496\" referrerpolicy=\"no-referrer\" src=\"https:\/\/segmentfault.com\/img\/bVdbwNx\" alt=\"image-20210430194043245.png\" title=\"image-20210430194043245.png\" loading=\"lazy\"><\/p>\n<p>hotspot\u4e2d\u6709\u4e24\u79cdJIT\u5373\u65f6\u7f16\u8bd1\u5668<\/p>\n<p>Client\u6a21\u5f0f\u4e0b\u7684<strong>C1\u7f16\u8bd1\u5668\uff1a\u7b80\u5355\u4f18\u5316\uff0c\u8017\u65f6\u77ed<\/strong>\uff08C1\u4f18\u5316\u7b56\u7565\uff1a\u65b9\u6cd5\u5185\u8054\uff0c\u53bb\u865a\u62df\u5316\uff0c\u5197\u4f59\u6d88\u9664\uff09<\/p>\n<p>Server\u6a21\u5f0f\u4e0b\u7684<strong>C2\u7f16\u8bd1\u5668\uff1a\u6df1\u5ea6\u4f18\u5316\uff0c\u8017\u65f6\u957f<\/strong> \uff08C2\u4e3b\u8981\u662f\u9003\u9038\u5206\u6790\u7684\u4f18\u5316\uff1a\u6807\u91cf\u66ff\u6362\uff0c\u9501\u6d88\u9664\uff0c\u6808\u4e0a\u5206\u914d\uff09<\/p>\n<p><strong>\u5206\u5c42\u7f16\u8bd1\u7b56\u7565\uff1a\u7a0b\u5e8f\u89e3\u91ca\u6267\u884c\uff08\u4e0d\u5f00\u542f\u9003\u9038\u5206\u6790\uff09\u53ef\u4ee5\u89e6\u53d1C1\u7f16\u8bd1\uff0c\u5f00\u542f\u9003\u9038\u5206\u6790\u53ef\u4ee5\u89e6\u53d1C2\u7f16\u8bd1<\/strong><\/p>\n<p><strong>\u89e3\u91ca\u5668\uff0cC1\uff0cC2\u7f16\u8bd1\u5668\u540c\u65f6\u5de5\u4f5c\uff0c\u70ed\u70b9\u4ee3\u7801\u53ef\u80fd\u88ab\u7f16\u8bd1\u591a\u6b21<\/strong><\/p>\n<p>\u89e3\u91ca\u5668\u5728\u7a0b\u5e8f\u521a\u521a\u5f00\u59cb\u7684\u65f6\u5019\u89e3\u91ca\u6267\u884c\uff0c\u4e0d\u9700\u8981\u627f\u62c5\u76d1\u63a7\u7684\u5f00\u9500<\/p>\n<p>C1\u6709\u7740\u66f4\u5feb\u7684\u7f16\u8bd1\u901f\u5ea6\uff0c\u80fd\u4e3aC2\u7f16\u8bd1\u4f18\u5316\u4e89\u53d6\u66f4\u591a\u65f6\u95f4<\/p>\n<p>C2\u7528\u9ad8\u590d\u6742\u5ea6\u7b97\u6cd5\uff0c\u7f16\u8bd1\u4f18\u5316\u7a0b\u5ea6\u5f88\u9ad8\u7684\u4ee3\u7801<\/p>\n<h3>\u9003\u9038\u5206\u6790\u5e26\u6765\u7684\u4f18\u5316<\/h3>\n<p><strong>\u5f53\u5bf9\u8c61\u4f5c\u7528\u57df\u53ea\u5728\u67d0\u4e2a\u65b9\u6cd5\u65f6\uff0c\u4e0d\u4f1a\u88ab\u5916\u754c\u8c03\u7528\u5230<\/strong>\uff0c\u90a3\u4e48\u8fd9\u4e2a\u5bf9\u8c61\u5c31\u4e0d\u4f1a\u53d1\u751f\u9003\u9038<\/p>\n<p>\u5f00\u542f\u9003\u9038\u5206\u6790\u540e\uff0c\u4f1a\u5206\u6790\u5bf9\u8c61\u662f\u5426\u53d1\u751f\u9003\u9038\uff0c<strong>\u5f53\u4e0d\u80fd\u53d1\u751f\u9003\u9038\u65f6\u4f1a\u8fdb\u884c\u6808\u4e0a\u5206\u914d\u3001\u9501\u6d88\u9664\u3001\u6807\u91cf\u66ff\u6362\u7b49\u4f18\u5316<\/strong><\/p>\n<h4>\u6808\u4e0a\u5206\u914d\u5185\u5b58<\/h4>\n<pre><code class=\"java\">\u00a0\/\/-Xms1G -Xmx1G -XX:+PrintGCDetails \n\u00a0public class StackMemory {\n\u00a0 \u00a0 \u00a0public static void main(String[] args) {\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0long start = System.currentTimeMillis();\n\u00a0\u200b\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0for (int i = 0; i &lt; 10000000; i++) {\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0memory();\n\u00a0 \u00a0 \u00a0 \u00a0  }\n\u00a0\u200b\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0System.out.println(&quot;\u82b1\u8d39\u65f6\u95f4:&quot;+(System.currentTimeMillis()-start)+&quot;ms&quot;);\n\u00a0\u200b\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0try {\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0TimeUnit.SECONDS.sleep(1000);\n\u00a0 \u00a0 \u00a0 \u00a0  } catch (InterruptedException e) {\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0e.printStackTrace();\n\u00a0 \u00a0 \u00a0 \u00a0  }\n\u00a0 \u00a0  }\n\u00a0\u200b\n\u00a0 \u00a0 \u00a0private static void memory(){\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0StackMemory memory = new StackMemory();\n\u00a0 \u00a0  }\n\u00a0}<\/code><\/pre>\n<p>-XX:-DoEscapeAnalysis \u82b1\u8d39\u65f6\u95f4:63ms (\u672a\u5f00\u542f\u9003\u9038\u5206\u6790)<\/p>\n<p>-XX:+DoEscapeAnalysis \u82b1\u8d39\u65f6\u95f4:4ms (\u5f00\u542f\u9003\u9038\u5206\u6790)<\/p>\n<p><strong>\u9ed8\u8ba4\u5f00\u542f\u9003\u9038\u5206\u6790<\/strong><\/p>\n<h4>\u9501\u6d88\u9664<\/h4>\n<p>\u540c\u6b65\u52a0\u9501\u4f1a\u5e26\u6765\u5f00\u9500<\/p>\n<p>\u9501\u6d88\u9664\uff1a\u5f53\u52a0\u9501\u5bf9\u8c61\u53ea\u4f5c\u7528\u67d0\u4e2a\u65b9\u6cd5\u65f6\uff0cJIT\u7f16\u8bd1\u5668\u501f\u52a9\u9003\u9038\u5206\u6790<strong>\u5224\u65ad\u4f7f\u7528\u7684\u9501\u5bf9\u8c61\u662f\u4e0d\u662f\u53ea\u80fd\u88ab\u4e00\u4e2a\u7ebf\u7a0b\u8bbf\u95ee<\/strong>\uff0c\u5982\u679c\u662f\u8fd9\u79cd\u60c5\u51b5\u4e0b\u5c31\u4e0d\u9700\u8981\u540c\u6b65\uff0c\u53ef\u4ee5\u53d6\u6d88\u8fd9\u90e8\u5206\u4ee3\u7801\u7684\u540c\u6b65\uff0c\u63d0\u9ad8\u5e76\u53d1\u6027\u80fd<\/p>\n<h4>\u6807\u91cf\u66ff\u6362<\/h4>\n<p>\u6807\u91cf: \u65e0\u6cd5\u518d\u5206\u89e3\u7684\u6570\u636e (\u57fa\u672c\u6570\u636e\u7c7b\u578b)<\/p>\n<p>\u805a\u5408\u91cf: \u8fd8\u53ef\u4ee5\u518d\u5206\u89e3\u7684\u6570\u636e (\u5bf9\u8c61)<\/p>\n<p><strong>\u6807\u91cf\u66ff\u6362: JIT\u501f\u52a9\u9003\u9038\u5206\u6790\uff0c\u8be5\u5bf9\u8c61\u4e0d\u53d1\u751f\u9003\u9038\uff0c\u53ea\u4f5c\u7528\u4e8e\u67d0\u4e2a\u65b9\u6cd5\u4f1a\u628a\u8be5\u5bf9\u8c61(\u805a\u5408\u91cf)\u62c6\u6210\u82e5\u5e72\u4e2a\u6210\u5458\u53d8\u91cf(\u6807\u91cf)\u6765\u4ee3\u66ff<\/strong><\/p>\n<p><strong>\u9ed8\u8ba4\u5f00\u542f\u6807\u91cf\u66ff\u6362<\/strong><\/p>\n<pre><code class=\"java\">\u00a0public class ScalarSubstitution {\n\u00a0 \u00a0 \u00a0static class Man{\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0int age;\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0int id;\n\u00a0\u200b\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0public Man() {\n\u00a0 \u00a0 \u00a0 \u00a0  }\n\u00a0 \u00a0  }\n\u00a0\u200b\n\u00a0 \u00a0 \u00a0public static void createInstance(){\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0Man man = new Man();\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0man.id = 123;\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0man.age = 321;\n\u00a0 \u00a0  }\n\u00a0 \u00a0 \u00a0public static void main(String[] args) {\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0long start = System.currentTimeMillis();\n\u00a0\u200b\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0for (int i = 0; i &lt; 10000000; i++) {\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0createInstance();\n\u00a0 \u00a0 \u00a0 \u00a0  }\n\u00a0\u200b\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0System.out.println(&quot;\u82b1\u8d39\u65f6\u95f4:&quot;+(System.currentTimeMillis()-start)+&quot;ms&quot;);\n\u00a0\u200b\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0try {\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0TimeUnit.SECONDS.sleep(1000);\n\u00a0 \u00a0 \u00a0 \u00a0  } catch (InterruptedException e) {\n\u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0 \u00a0e.printStackTrace();\n\u00a0 \u00a0 \u00a0 \u00a0  }\n\u00a0 \u00a0  }\n\u00a0}<\/code><\/pre>\n<pre><code>\u00a0\/\/-Xmx200m -Xms200m -XX:+PrintGCDetails \n\u00a0\/\/-XX:+DoEscapeAnalysis \u8bbe\u7f6e\u5f00\u542f\u9003\u9038\u5206\u6790\n\u00a0\/\/-XX:-EliminateAllocations \u8bbe\u7f6e\u4e0d\u5f00\u542f\u6807\u91cf\u66ff\u6362 \n\u00a0\/\/\u5f00\u542f\u9003\u9038\u5206\u6790 + \u5173\u95ed\u6807\u91cf\u66ff\u6362 : \u82b1\u8d39\u65f6\u95f4:93ms\n \/\/\u5f00\u542f\u9003\u9038\u5206\u6790 + \u5f00\u542f\u6807\u91cf\u66ff\u6362  : \u82b1\u8d39\u65f6\u95f4:6ms<\/code><\/pre>\n<h3>\u70ed\u70b9\u4ee3\u7801\u4e0e\u70ed\u70b9\u63a2\u6d4b<\/h3>\n<p>JIT\u7f16\u8bd1\u5668\u5e76\u4e0d\u662f\u7f16\u8bd1\u6240\u6709\u7684\u5b57\u8282\u7801\uff0cJIT\u7f16\u8bd1\u5668\u53ea\u7f16\u8bd1\u70ed\u70b9\u4ee3\u7801<\/p>\n<p><strong>\u70ed\u70b9\u4ee3\u7801: \u88ab\u591a\u6b21\u8c03\u7528\u7684\u65b9\u6cd5 \u6216 \u65b9\u6cd5\u4e2d\u591a\u6b21\u5faa\u73af\u7684\u5faa\u73af\u4f53<\/strong><\/p>\n<p><strong>\u6808\u4e0a\u66ff\u6362(OSR): JIT\u5c06\u65b9\u6cd5\u4e2d\u7684\u70ed\u70b9\u4ee3\u7801\u7f16\u8bd1\u4e3a\u672c\u5730\u673a\u5668\u6307\u4ee4\uff08\u88ab\u591a\u6b21\u6267\u884c\u7684\u5faa\u73af\u4f53\uff09<\/strong><\/p>\n<p><strong>\u7f16\u8bd1\u5bf9\u8c61\u90fd\u662f\u65b9\u6cd5\uff0c\u5982\u679c\u662f\u6808\u4e0a\u66ff\u6362\u5219&#8221;\u5165\u53e3&#8221;\u5728\u65b9\u6cd5\u7684\u5faa\u73af\u4f53\u5f00\u59cb\u90a3\u91cc<\/strong><\/p>\n<p><strong>\u70ed\u70b9\u63a2\u6d4b\u529f\u80fd<\/strong>\u51b3\u5b9a\u4e86\u88ab\u8c03\u7528\u591a\u5c11\u6b21\u7684\u65b9\u6cd5\u80fd\u6210\u4e3a\u70ed\u70b9\u4ee3\u7801<\/p>\n<p>hotspot\u91c7\u7528<strong>\u57fa\u4e8e\u8ba1\u6570\u5668\u7684\u70ed\u70b9\u63a2\u6d4b<\/strong><\/p>\n<ul>\n<li><strong>\u65b9\u6cd5\u8c03\u7528\u8ba1\u6570\u5668 : \u7edf\u8ba1\u65b9\u6cd5\u8c03\u7528\u6b21\u6570<\/strong><\/li>\n<li><strong>\u56de\u8fb9\u8ba1\u6570\u5668 : \u7edf\u8ba1\u5faa\u73af\u4f53\u6267\u884c\u5faa\u73af\u6b21\u6570<\/strong><\/li>\n<\/ul>\n<p>\u65b9\u6cd5\u8c03\u7528\u65f6\u5148\u5224\u65ad\u662f\u5426\u6709\u6267\u884c\u7f16\u8bd1\u540e\u7684\u673a\u5668\u7801\uff0c\u6709\u5219\u76f4\u63a5\u4f7f\u7528\u65b9\u6cd5\u533a\u7684Code cache\u4e2d\u7684\u673a\u5668\u7801\uff1b\u6ca1\u6709\u673a\u5668\u7801\u5219\u5224\u65ad\u8ba1\u6570\u5668\u6b21\u6570\u662f\u5426\u8d85\u8fc7\u9608\u503c\uff0c\u8d85\u8fc7\u5219\u89e6\u53d1\u7f16\u8bd1\uff0c\u7f16\u8bd1\u540e\u673a\u5668\u7801\u5b58\u50a8\u5728\u65b9\u6cd5\u533aCode cache\u4e2d\u4f7f\u7528\uff1b\u6700\u540e\u90fd\u6ca1\u6709\u5c31\u4f7f\u7528\u89e3\u91ca\u6267\u884c<\/p>\n<h3>\u603b\u7ed3<\/h3>\n<p>\u672c\u7bc7\u6587\u7ae0\u5c06\u56f4\u7ed5\u6267\u884c\u5f15\u64ce\uff0c\u6df1\u5165\u6d45\u51fa\u7684\u89e3\u6790\u6267\u884c\u5f15\u64ce\u4e2d\u7684\u89e3\u91ca\u5668\u3001\u5373\u65f6\u7f16\u8bd1\u5668\u5404\u81ea\u6267\u884c\u7684\u4f18\u7f3a\u70b9\u4ee5\u53ca\u539f\u7406<\/p>\n<p><strong>\u6267\u884c\u5f15\u64ce\u7531\u89e3\u91ca\u5668\u3001\u5373\u65f6\u7f16\u8bd1\u5668\u3001\u5783\u573e\u6536\u96c6\u5668\u6784\u6210\uff0c\u9ed8\u8ba4\u60c5\u51b5\u4e0b\u4f7f\u7528\u89e3\u91ca\u5668\u4e0e\u7f16\u8bd1\u5668\u7684\u6df7\u5408\u65b9\u5f0f\u6267\u884c<\/strong><\/p>\n<p><strong>\u5373\u65f6\u7f16\u8bd1\u5668\u5206\u4e3aC1\u3001C2\u7f16\u8bd1\u5668\uff0c\u5176\u4e2dC1\u7f16\u8bd1\u5feb\u4f46\u4f18\u5316\u5c0f\uff0cC2\u5f00\u542f\u9003\u9038\u5206\u6790\u4f7f\u7528\u6808\u4e0a\u5206\u914d\u3001\u9501\u6d88\u9664\u3001\u6807\u91cf\u66ff\u6362\u8fdb\u884c\u4f18\u5316\uff0c\u7f16\u8bd1\u8017\u65f6\u4f46\u662f\u4f18\u5316\u5927<\/strong><\/p>\n<p><strong>\u5373\u65f6\u7f16\u8bd1\u5668\u5e76\u4e0d\u662f\u6240\u6709\u4ee3\u7801\u90fd\u7f16\u8bd1\uff0c\u800c\u662f\u4f7f\u7528\u65b9\u6cd5\u6280\u672f\u548c\u5faa\u73af\u8ba1\u6570\u6765\u5c06\u70ed\u70b9\u4ee3\u7801\u7f16\u8bd1\u6210\u673a\u5668\u7801\u5b58\u653e\u5728\u65b9\u6cd5\u533a\u7684Code Cache\u4e2d<\/strong><\/p>\n<p><strong>\u5728\u6df7\u5408\u6267\u884c\u7684\u6a21\u5f0f\u4e0b\uff0c\u89e3\u91ca\u5668\u3001C1\u3001C2\u7f16\u8bd1\u5668\u540c\u65f6\u5de5\u4f5c\uff0c\u5206\u5c42\u7f16\u8bd1<\/strong><\/p>\n<h3>\u6700\u540e\uff08\u4e00\u952e\u4e09\u8fde\u6c42\u6c42\u62c9~\uff09<\/h3>\n<p>\u672c\u7bc7\u6587\u7ae0\u7b14\u8bb0\u4ee5\u53ca\u6848\u4f8b\u88ab\u6536\u5165 <a target=\"_blank\" href=\"https:\/\/link.segmentfault.com\/?enc=gdyDzIBFU2BijhYVHk5zRA%3D%3D.7Gmg%2Fmt%2BfsU%2FBgvKMozARrJzcGUsxOYd1WcmlR%2BQFOChWmcHfKMD3jVqUjnu6V1mXbI2e4jSxct0dQ42kD5KPforjgLWmLeQ7rt7xvBTn5Jk1ay3%2BupFx1ye3lZCefjv\" rel=\"noopener noreferrer\">gitee-StudyJava<\/a>\u3001 <a target=\"_blank\" href=\"https:\/\/link.segmentfault.com\/?enc=l8owcwaXxW4vtUL11nraTQ%3D%3D.1V7b%2BXfi4B5VztUJ9Db2j9pEeTDJweEm4fp%2FvLM44V8JbfhObddqzs0Wnp0aWZMw2gId1TcUIrNeX1UtsBvc7tH7Bgcdz%2BTGqD1OkXZNVLo%3D\" rel=\"noopener noreferrer\">github-StudyJava<\/a> \u611f\u5174\u8da3\u7684\u540c\u5b66\u53ef\u4ee5stat\u4e0b\u6301\u7eed\u5173\u6ce8\u5594\/~<\/p>\n<p>\u6709\u4ec0\u4e48\u95ee\u9898\u53ef\u4ee5\u5728\u8bc4\u8bba\u533a\u4ea4\u6d41\uff0c\u5982\u679c\u89c9\u5f97\u83dc\u83dc\u5199\u7684\u4e0d\u9519\uff0c\u53ef\u4ee5\u70b9\u8d5e\u3001\u5173\u6ce8\u3001\u6536\u85cf\u652f\u6301\u4e00\u4e0b\/~<\/p>\n<p>\u5173\u6ce8\u83dc\u83dc\uff0c\u5206\u4eab\u66f4\u591a\u5e72\u8d27\uff0c\u516c\u4f17\u53f7\uff1a\u83dc\u83dc\u7684\u540e\u7aef\u79c1\u623f\u83dc<\/p>\n<blockquote><p>\u672c\u6587\u7531\u535a\u5ba2\u4e00\u6587\u591a\u53d1\u5e73\u53f0 <a target=\"_blank\" href=\"https:\/\/link.segmentfault.com\/?enc=c%2FUHvnvW4nLpeB9xTU%2F%2BkQ%3D%3D.s%2Bc5BOPqMI3QrNEB%2FD6PhNI9hiiNY74pL6Lb88Dg3qQBf6jF2kMF6RElQF4SGLx1\" rel=\"noopener noreferrer\">OpenWrite<\/a> \u53d1\u5e03\uff01<\/p><\/blockquote>\n<p><a href=\"https:\/\/segmentfault.com\/a\/1190000044654346\">https:\/\/segmentfault.com\/a\/1190000044654346<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u672c\u7bc7\u6587\u7ae0\u56f4\u7ed5\u6267\u884c\u5f15\u64ce\uff0c\u6df1\u5165\u6d45\u51fa\u7684\u89e3\u6790\u6267\u884c\u5f15\u64ce\u4e2d\u89e3\u91ca\u5668\u4e0e\u7f16\u8bd1\u5668\u7684\u89e3\u91ca\u6267\u884c\u548c\u7f16\u8bd1\u6267\u884c\u3001\u6267\u884c\u5f15\u64ce\u7684\u6267\u884c\u65b9\u5f0f\u3001\u9003\u9038\u5206\u6790 [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_jetpack_memberships_contains_paid_content":false,"footnotes":""},"categories":[4],"tags":[],"class_list":["post-10008399","post","type-post","status-publish","format-standard","hentry","category-share"],"jetpack_sharing_enabled":true,"jetpack_featured_media_url":"","_links":{"self":[{"href":"https:\/\/itmax.cn\/index.php?rest_route=\/wp\/v2\/posts\/10008399","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/itmax.cn\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/itmax.cn\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/itmax.cn\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/itmax.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=10008399"}],"version-history":[{"count":0,"href":"https:\/\/itmax.cn\/index.php?rest_route=\/wp\/v2\/posts\/10008399\/revisions"}],"wp:attachment":[{"href":"https:\/\/itmax.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=10008399"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/itmax.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=10008399"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/itmax.cn\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=10008399"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}