{"id":10020409,"date":"2024-11-22T02:54:01","date_gmt":"2024-11-21T18:54:01","guid":{"rendered":"https:\/\/itmax.cn\/?p=10020409"},"modified":"2024-11-22T02:54:01","modified_gmt":"2024-11-21T18:54:01","slug":"java%e6%80%a7%e8%83%bd%e6%b5%8b%e8%af%95%e5%88%a9%e5%99%a8%ef%bc%9ajmh%e5%85%a5%e9%97%a8%e4%b8%8e%e5%ae%9e%e8%b7%b5%ef%bd%9c%e5%be%97%e7%89%a9%e6%8a%80%e6%9c%af","status":"publish","type":"post","link":"https:\/\/itmax.cn\/?p=10020409","title":{"rendered":"Java\u6027\u80fd\u6d4b\u8bd5\u5229\u5668\uff1aJMH\u5165\u95e8\u4e0e\u5b9e\u8df5\uff5c\u5f97\u7269\u6280\u672f"},"content":{"rendered":"

\u5728\u8f6f\u4ef6\u5f00\u53d1\u4e2d\uff0c\u6027\u80fd\u6d4b\u8bd5\u662f\u4e0d\u53ef\u6216\u7f3a\u7684\u4e00\u73af\u3002\u4f46\u662f\u7f16\u5199\u57fa\u51c6\u6d4b\u8bd5\u6765\u6b63\u786e\u8861\u91cf\u5927\u578b\u5e94\u7528\u7a0b\u5e8f\u7684\u4e00\u5c0f\u90e8\u5206\u7684\u6027\u80fd\u5374\u53c8\u975e\u5e38\u56f0\u96be\u3002\u5f53\u57fa\u51c6\u6d4b\u8bd5\u5355\u72ec\u6267\u884c\u7ec4\u4ef6\u65f6\uff0cJVM\u6216\u5e95\u5c42\u786c\u4ef6\u53ef\u80fd\u4f1a\u5bf9\u60a8\u7684\u7ec4\u4ef6\u5e94\u7528\u8bb8\u591a\u4f18\u5316\u3002\u5f53\u7ec4\u4ef6\u4f5c\u4e3a\u5927\u578b\u5e94\u7528\u7a0b\u5e8f\u7684\u4e00\u90e8\u5206\u8fd0\u884c\u65f6\uff0c\u8fd9\u4e9b\u4f18\u5316\u53ef\u80fd\u65e0\u6cd5\u5e94\u7528\u3002\u56e0\u6b64\uff0c\u5b9e\u65bd\u4e0d\u5f53\u7684\u5fae\u57fa\u51c6\u6d4b\u8bd5\u53ef\u80fd\u4f1a\u8ba9\u60a8\u76f8\u4fe1\u7ec4\u4ef6\u7684\u6027\u80fd\u6bd4\u5b9e\u9645\u60c5\u51b5\u66f4\u597d\u3002\u7f16\u5199\u6b63\u786e\u7684Java\u5fae\u57fa\u51c6\u6d4b\u8bd5\u901a\u5e38\u9700\u8981\u9632\u6b62JVM\u548c\u786c\u4ef6\u5728\u5fae\u57fa\u51c6\u6d4b\u8bd5\u6267\u884c\u671f\u95f4\u5e94\u7528\u7684\u4f18\u5316\uff0c\u800c\u8fd9\u4e9b\u4f18\u5316\u5728\u5b9e\u9645\u751f\u4ea7\u7cfb\u7edf\u4e2d\u662f\u65e0\u6cd5\u5e94\u7528\u7684\u3002\u8fd9\u5c31\u662fJMH\uff08Java \u5fae\u57fa\u51c6\u6d4b\u8bd5\u5de5\u5177\uff09\u53ef\u4ee5\u5e2e\u52a9\u60a8\u5b9e\u73b0\u7684\u529f\u80fd\u3002\u8fd9\u7bc7\u6587\u7ae0\u6211\u4f1a\u5168\u9762\u7ed9\u5927\u5bb6\u4ecb\u7ecd\u4e0bJMH\u7684\u5404\u4e2a\u65b9\u9762\u3002<\/p>\n

\u4e00\u3001JMH\u6982\u8ff0<\/h2>\n

JMH\u662f\u4e00\u4e2a\u7528\u4e8e\u5fae\u57fa\u51c6\u6d4b\u8bd5\u7684Java\u5e93\uff0c\u5b83\u5141\u8bb8\u5f00\u53d1\u8005\u5bf9\u4ee3\u7801\u7684\u70ed\u70b9\u8fdb\u884c\u7cbe\u786e\u7684\u6027\u80fd\u6d4b\u8bd5\u3002JMH\u7531OpenJDK\u56e2\u961f\u5f00\u53d1\uff0c\u662fJava\u6027\u80fd\u6d4b\u8bd5\u9886\u57df\u7684\u4e8b\u5b9e\u6807\u51c6\u3002<\/p>\n

JMH\u7684\u4e3b\u8981\u7279\u70b9:<\/p>\n

\u9ad8\u7cbe\u5ea6\uff1a\u652f\u6301\u7eb3\u79d2\u7ea7\u522b\u7684\u6027\u80fd\u6d4b\u8bd5\u3002<\/p>\n

\u6613\u7528\u6027\uff1a\u901a\u8fc7\u6ce8\u89e3\u914d\u7f6e\u6d4b\u8bd5\uff0c\u65e0\u9700\u590d\u6742\u7684\u6d4b\u8bd5\u73af\u5883\u642d\u5efa\u3002<\/p>\n

\u591a\u6a21\u5f0f\u6d4b\u8bd5\uff1a\u652f\u6301\u591a\u79cd\u6d4b\u8bd5\u6a21\u5f0f\uff0c\u5982\u541e\u5410\u91cf\u3001\u5e73\u5747\u65f6\u95f4\u7b49\u3002<\/p>\n

\u591a\u7ef4\u5ea6\u6d4b\u8bd5\uff1a\u53ef\u4ee5\u6d4b\u8bd5\u4ee3\u7801\u5728\u4e0d\u540c\u6761\u4ef6\u4e0b\u7684\u6027\u80fd\u8868\u73b0\u3002<\/p>\n

JMH\u4e0e\u5176\u4ed6\u6027\u80fd\u6d4b\u8bd5\u5de5\u5177\u7684\u6bd4\u8f83<\/p>\n

\u4e0eJVM\u5176\u4ed6\u6027\u80fd\u6d4b\u8bd5\u5de5\u5177\u76f8\u6bd4\uff0cJMH\u63d0\u4f9b\u4e86\u66f4\u7ec6\u7c92\u5ea6\u7684\u63a7\u5236\u548c\u66f4\u9ad8\u7684\u6d4b\u8bd5\u7cbe\u5ea6\u3002<\/p>\n

\u4e8c\u3001\u5feb\u901f\u5f00\u59cb<\/h2>\n

\u539f\u578b\u65b9\u5f0f\u751f\u6210Maven\u9879\u76ee<\/p>\n

\u4f7f\u7528JMH\u7684\u6700\u7b80\u5355\u65b9\u6cd5\u662f\u4f7f\u7528Maven\u539f\u578b\u751f\u6210\u4e00\u4e2a\u65b0\u7684JMH\u9879\u76ee\u3002Maven\u4f1a\u751f\u6210\u4e00\u4e2a\u65b0\u7684Java\u9879\u76ee\uff0c\u5176\u4e2d\u5305\u542b\u4e00\u4e2aJava\u793a\u4f8b\u7c7b\u548c\u4e00\u4e2apom.xml\u6587\u4ef6\u3002pom.xml\u6587\u4ef6\u5305\u542b\u7f16\u8bd1\u548c\u6784\u5efaJMH\u5fae\u57fa\u51c6\u6d4b\u8bd5Java\u793a\u4f8b\u7c7b\u6240\u9700\u7684Maven\u4f9d\u8d56\u3002<\/p>\n

\u4ee5\u4e0b\u662f\u751f\u6210JMH\u9879\u76ee\u6a21\u677f\u6240\u9700\u7684Maven\u547d\u4ee4\u884c\uff1a<\/p>\n

mvn archetype:generate\n          -DinteractiveMode=false\n          -DarchetypeGroupId=org.openjdk.jmh\n          -DarchetypeArtifactId=jmh-java-benchmark-archetype\n          -DgroupId=com.dewu\n          -DartifactId=first-benchmark\n          -Dversion=1.0<\/code><\/pre>\n
\u8fd9\u4e2a\u547d\u4ee4\u884c\u5c06\u521b\u5efa\u4e00\u4e2a\u540d\u4e3afirst-benchmark\uff08Maven \u547d\u4ee4\u4e2d\u6307\u5b9a\u7684artifactId\uff09\u7684\u65b0\u76ee\u5f55\u3002\u8fd9\u4e2a\u76ee\u5f55\u4e0b\u5c06\u751f\u6210\u4e00\u4e2a\u65b0\u7684Maven\u6e90\u76ee\u5f55\u7ed3\u6784\uff08src\/main\/java\uff09\u3002java\u6e90\u6839\u76ee\u5f55\u4e2d\u5c06\u751f\u6210\u4e00\u4e2a\u540d\u4e3acom.dewu\u7684\u5305\u3002\u5305\u5185\u662f\u4e00\u4e2a\u540d\u4e3aMyBenchmark\u7684JMH\u57fa\u51c6\u6d4b\u8bd5\u7c7b\u3002<\/p>\n
\u5df2\u6709\u9879\u76ee\u914d\u7f6eJMH<\/p>\n
\u5982\u679c\u662f\u5df2\u6709\u9879\u76ee\uff0c\u4f60\u53ef\u4ee5\u5728Maven\u9879\u76ee\u4e2d\u6dfb\u52a0\u4ee5\u4e0b\u4f9d\u8d56\uff1a<\/p>\n
xml\n<dependency>\n    <groupId>org.openjdk.jmh<\/groupId>\n    <artifactId>jmh-core<\/artifactId>\n    <version>1.33<\/version>\n    <scope>test<\/scope>\n<\/dependency>\n<dependency>\n    <groupId>org.openjdk.jmh<\/groupId>\n    <artifactId>jmh-generator-annprocess<\/artifactId>\n    <version>1.33<\/version>\n    <scope>test<\/scope>\n<\/dependency><\/code><\/pre>\n
\u7136\u540e\u518d\u7f16\u5199\u4f60\u7684\u7b2c\u4e00\u4e2aJMH\u57fa\u51c6\u6d4b\u8bd5\u7c7b\uff0c\u4e0b\u9762\u662f\u6211\u5199\u7684\u4e00\u4e2a\u793a\u4f8b\uff1a<\/p>\n
package com.dewu; \nimport org.openjdk.jmh.annotations.Benchmark; \npublic class MyBenchmark { \n    @Benchmark \n    public void testMethod() { \n        \/\/ \u8fd9\u662f\u7528\u4e8e\u6784\u5efa JMH \u57fa\u51c6\u7684\u6f14\u793a\/\u793a\u4f8b\u6a21\u677f\u3002\u6839\u636e\u9700\u8981\u8fdb\u884c\u7f16\u8f91\u3002\n        \/\/ \u5728\u6b64\u5904\u653e\u7f6e\u57fa\u51c6\u4ee3\u7801\u3002\n    } \n}<\/code><\/pre>\n
\u4f60\u53ef\u4ee5\u628a\u8981\u6d4b\u91cf\u7684\u4ee3\u7801\u653e\u5728testMethod()\u65b9\u6cd5\u4f53\u91cc\u9762\u3002\u4e0b\u9762\u662f\u4e00\u4e2a\u4f8b\u5b50\uff1a<\/p>\n
package com.dewu; \nimport org.openjdk.jmh.annotations.Benchmark; \npublic class MyBenchmark { \n    @Benchmark \n    public void testMethod() { \n        \/\/ \u8fd9\u662f\u7528\u4e8e\u6784\u5efa JMH \u57fa\u51c6\u7684\u6f14\u793a\/\u793a\u4f8b\u6a21\u677f\u3002\u6839\u636e\u9700\u8981\u8fdb\u884c\u7f16\u8f91\u3002\n        \/\/ \u5728\u6b64\u5904\u653e\u7f6e\u57fa\u51c6\u4ee3\u7801\u3002\n        int a = 1; \n        int b = 2; \n        int sum = a + b; \n    } \n}<\/code><\/pre>\n
\u6ce8\u610f\uff1a\u8fd9\u4e2a\u7279\u5b9a\u793a\u4f8b\u662f\u4e00\u4e2a\u7cdf\u7cd5\u7684\u57fa\u51c6\u6d4b\u8bd5\u5b9e\u73b0\uff0c\u56e0\u4e3a JVM \u68c0\u6d4b\u5230sum\u53d8\u91cf\u4ece\u672a\u4f7f\u7528\u8fc7\uff0c\u56e0\u6b64\u53ef\u80fd\u4f1a\u6d88\u9664\u8fd9\u6bb5\u603b\u548c\u8ba1\u7b97\u7684\u4ee3\u7801\u3002\u6211\u5c06\u5728\u672c\u6559\u7a0b\u7684\u540e\u9762\u90e8\u5206\u4ecb\u7ecd\u5982\u4f55\u4f7f\u7528 JMH \u6b63\u786e\u7684\u5b9e\u73b0\u57fa\u51c6\u6d4b\u8bd5\u6765\u907f\u514dJVM\u7684\u6b7b\u4ee3\u7801\u6d88\u9664\u3002<\/p>\n
\u4e09\u3001JMH\u7684\u6838\u5fc3\u6982\u5ff5\u548c\u6ce8\u89e3<\/h2>\n
\u57fa\u51c6\u6d4b\u8bd5\u65b9\u6cd5<\/strong><\/p>\n
\u4f7f\u7528@Benchmark\u6ce8\u89e3\u6807\u8bb0\u9700\u8981\u8dd1\u57fa\u51c6\u6d4b\u8bd5\u7684\u65b9\u6cd5\u3002<\/p>\n
\u6d4b\u8bd5\u6a21\u5f0f\uff08Benchmark Mode\uff09<\/strong><\/p>\n
\u6d4b\u8bd5\u6a21\u5f0f\u4f7f\u7528@BenchmarkMode\u6ce8\u89e3\u6807\u8bb0\uff0c\u4e3b\u8981\u5305\u542b\u4ee5\u4e0b\u51e0\u79cd\u6a21\u5f0f\uff1a<\/p>\n
Throughput\uff1a\u541e\u5410\u91cf\uff0c\u5355\u4f4d\u65f6\u95f4\u5185\u53ef\u4ee5\u5b8c\u6210\u7684\u64cd\u4f5c\u6570\u3002<\/p>\n
AverageTime\uff1a\u5e73\u5747\u65f6\u95f4\uff0c\u5b8c\u6210\u4e00\u6b21\u64cd\u4f5c\u6240\u9700\u7684\u5e73\u5747\u65f6\u95f4\u3002<\/p>\n
SampleTime\uff1a\u57fa\u4e8e\u91c7\u6837\u7684\u6267\u884c\u65f6\u95f4\uff0c\u63d0\u4f9b\u7edf\u8ba1\u5206\u5e03\u6570\u636e\u3002<\/p>\n
SingleShotTime\uff1a\u5355\u6b21\u6267\u884c\u65f6\u95f4\uff0c\u7528\u4e8e\u6d4b\u8bd5\u51b7\u542f\u52a8\u6027\u80fd\u3002<\/p>\n
ALL\uff1a\u8fd0\u884c\u6240\u6709\u6a21\u5f0f\u3002<\/p>\n
\u72b6\u6001\uff08State\uff09<\/strong><\/p>\n
\u4f7f\u7528@State\u6ce8\u89e3\u5b9a\u4e49\uff0c\u8868\u793a\u6d4b\u8bd5\u72b6\u6001\u7684\u751f\u547d\u5468\u671f\u548c\u4f5c\u7528\u57df\u3002<\/p>\n
Scope.Thread\uff1a\u6bcf\u4e2a\u7ebf\u7a0b\u4e00\u4e2a\u5b9e\u4f8b\u3002<\/p>\n
Scope.Benchmark\uff1a\u6240\u6709\u7ebf\u7a0b\u5171\u4eab\u4e00\u4e2a\u5b9e\u4f8b\u3002<\/p>\n
Scope.Group\uff1a\u6bcf\u4e2a\u7ebf\u7a0b\u7ec4\u5171\u4eab\u4e00\u4e2a\u5b9e\u4f8b\u3002<\/p>\n
\u9884\u70ed\uff08Warmup\uff09\uff1a<\/strong><\/p>\n
\u4f7f\u7528@Warmup\u6ce8\u89e3\u914d\u7f6e\uff0c\u9884\u70ed\u662f\u6b63\u5f0f\u6d4b\u8bd5\u524d\u7684\u51c6\u5907\u9636\u6bb5\uff0c\u7528\u4e8e\u201c\u70ed\u8eab\u201dJVM\uff0c\u51cf\u5c11JIT\u7f16\u8bd1\u7684\u5f71\u54cd\u3002<\/p>\n
\u6d4b\u91cf\uff08Measurement\uff09\uff1a<\/strong><\/p>\n
\u4f7f\u7528@Measurement\u6ce8\u89e3\u914d\u7f6e\uff0c\u6307\u5b9a\u6b63\u5f0f\u6d4b\u8bd5\u7684\u8fed\u4ee3\u6b21\u6570\u548c\u6bcf\u6b21\u8fed\u4ee3\u7684\u8fd0\u884c\u65f6\u95f4\u3002<\/p>\n
\u8f93\u51fa\u65f6\u95f4\u5355\u4f4d\uff08Output Time Unit\uff09\uff1a<\/strong><\/p>\n
\u4f7f\u7528@OutputTimeUnit\u6ce8\u89e3\u6307\u5b9a\u6d4b\u8bd5\u7ed3\u679c\u7684\u65f6\u95f4\u5355\u4f4d\u3002<\/p>\n
\u591a\u7ebf\u7a0b\uff08Threads\uff09\uff1a<\/strong><\/p>\n
\u4f7f\u7528@Threads\u6ce8\u89e3\u6307\u5b9a\u6d4b\u8bd5\u65b9\u6cd5\u8fd0\u884c\u7684\u7ebf\u7a0b\u6570\u3002<\/p>\n
\u53c2\u6570\u5316\uff08Params\uff09\uff1a<\/strong><\/p>\n
\u4f7f\u7528@Param\u6ce8\u89e3\u4e3a\u57fa\u51c6\u6d4b\u8bd5\u65b9\u6cd5\u63d0\u4f9b\u53c2\u6570\uff0c\u5141\u8bb8\u5728\u5355\u4e2a\u6d4b\u8bd5\u4e2d\u8fd0\u884c\u591a\u4e2a\u53c2\u6570\u96c6\u3002<\/p>\n
\u9694\u79bb\uff08Fork\uff09\uff1a<\/strong><\/p>\n
\u4f7f\u7528@Fork\u6ce8\u89e3\u6307\u5b9a\u6d4b\u8bd5\u8fd0\u884c\u5728\u4e0d\u540c\u7684JVM\u8fdb\u7a0b\u4e2d\u8fdb\u884c\uff0c\u4ee5\u907f\u514d\u6d4b\u8bd5\u95f4\u7684\u76f8\u4e92\u5f71\u54cd\u3002\u901a\u5e38\u8bbe\u7f6e\u4e3a1\u3002<\/p>\n
\u8f85\u52a9\u8ba1\u6570\u5668\uff08AuxCounters\uff09\uff1a<\/strong><\/p>\n
\u4f7f\u7528@AuxCounters\u6ce8\u89e3\u63d0\u4f9b\u989d\u5916\u7684\u6027\u80fd\u8ba1\u6570\u5668\u3002<\/p>\n
\u63a7\u5236\u7f16\u8bd1\u5668\u4f18\u5316\uff08CompilerControl\uff09\uff1a<\/strong><\/p>\n
\u4f7f\u7528@CompilerControl\u6ce8\u89e3\u63a7\u5236JVM\u7684\u7f16\u8bd1\u4f18\u5316\u884c\u4e3a\u3002<\/p>\n
Blackhole\uff1a<\/strong><\/p>\n
JMH\u63d0\u4f9b\u7684\u4e00\u4e2a\u673a\u5236\uff0c\u7528\u4e8e\u201c\u541e\u566c\u201d\u6d4b\u8bd5\u65b9\u6cd5\u7684\u8f93\u51fa\uff0c\u9632\u6b62JVM\u7684\u6b7b\u4ee3\u7801\u6d88\u9664\u4f18\u5316\u3002<\/p>\n
\u7ed3\u679c\u5206\u6790\uff08Result Analysis\uff09\uff1a<\/strong><\/p>\n
JMH\u751f\u6210\u8be6\u7ec6\u7684\u6d4b\u8bd5\u62a5\u544a\uff0c\u5305\u62ec\u64cd\u4f5c\u7684\u5e73\u5747\u65f6\u95f4\u3001\u541e\u5410\u91cf\u3001\u8bef\u5dee\u8303\u56f4\u7b49\u3002<\/p>\n
API\u548c\u6ce8\u89e3\uff08API and Annotations\uff09\uff1a<\/p>\n
JMH\u63d0\u4f9b\u4e86\u4e30\u5bcc\u7684API\u548c\u6ce8\u89e3\u6765\u914d\u7f6e\u548c\u8fd0\u884c\u57fa\u51c6\u6d4b\u8bd5\u3002<\/p>\n
\u56db\u3001JMH\u7684\u5de5\u4f5c\u539f\u7406<\/h2>\n
JVM\u5bf9\u6027\u80fd\u6d4b\u8bd5\u7684\u5f71\u54cd<\/h4>\n
JVM\u7684\u5373\u65f6\u7f16\u8bd1\u5668\uff08JIT\uff09\u4f1a\u5bf9\u4ee3\u7801\u8fdb\u884c\u4f18\u5316\uff0c\u8fd9\u53ef\u80fd\u4f1a\u5f71\u54cd\u6027\u80fd\u6d4b\u8bd5\u7684\u7ed3\u679c\u3002JMH\u901a\u8fc7\u63a7\u5236\u6d4b\u8bd5\u73af\u5883\uff0c\u786e\u4fdd\u6d4b\u8bd5\u7ed3\u679c\u7684\u51c6\u786e\u6027\u3002<\/p>\n
JMH\u5982\u4f55\u63d0\u4f9b\u51c6\u786e\u7684\u6d4b\u8bd5\u7ed3\u679c<\/p>\n
JMH\u901a\u8fc7\u9884\u70ed\u3001\u591a\u8f6e\u8fed\u4ee3\u3001\u591a\u8fdb\u7a0b\u6d4b\u8bd5\u7b49\u673a\u5236\uff0c\u51cf\u5c11JVM\u4f18\u5316\u5bf9\u6d4b\u8bd5\u7ed3\u679c\u7684\u5f71\u54cd\u3002\u4ee5\u4e0b\u662f\u4e00\u4e2a\u4f7f\u7528JMH\u8fdb\u884c\u57fa\u51c6\u6d4b\u8bd5\u7684\u793a\u4f8b\uff0c\u5b83\u5c55\u793a\u4e86JMH\u5982\u4f55\u901a\u8fc7\u9884\u70ed\u3001\u591a\u6b21\u8fed\u4ee3\u548c\u907f\u514dJVM\u4f18\u5316\u6765\u63d0\u4f9b\u51c6\u786e\u7684\u6d4b\u8bd5\u7ed3\u679c\u3002<\/p>\n
\u9996\u5148\uff0c\u786e\u4fdd\u4f60\u7684\u9879\u76ee\u4e2d\u5df2\u7ecf\u6dfb\u52a0\u4e86JMH\u7684\u4f9d\u8d56\u3002\u7136\u540e\uff0c\u521b\u5efa\u4e00\u4e2a\u57fa\u51c6\u6d4b\u8bd5\u7c7b\uff0c\u6211\u4eec\u5c06\u6d4b\u8bd5\u4e24\u4e2a\u65b9\u6cd5\uff1a\u4e00\u4e2a\u7b80\u5355\u7684\u6570\u5b66\u8fd0\u7b97\u548c\u4e00\u4e2a\u66f4\u590d\u6742\u7684\u6570\u5b66\u8fd0\u7b97\uff0c\u4ee5\u6bd4\u8f83\u5b83\u4eec\u7684\u6267\u884c\u65f6\u95f4\u3002<\/p>\n
import org.openjdk.jmh.annotations.Benchmark;\nimport org.openjdk.jmh.annotations.BenchmarkMode;\nimport org.openjdk.jmh.annotations.Mode;\nimport org.openjdk.jmh.annotations.OutputTimeUnit;\nimport org.openjdk.jmh.annotations.Warmup;\nimport org.openjdk.jmh.annotations.Measurement;\nimport org.openjdk.jmh.annotations.Fork;\nimport org.openjdk.jmh.annotations.State;\nimport org.openjdk.jmh.annotations.Scope;\nimport org.openjdk.jmh.infra.Blackhole;\nimport org.openjdk.jmh.runner.Runner;\nimport org.openjdk.jmh.runner.RunnerException;\nimport org.openjdk.jmh.runner.options.Options;\nimport org.openjdk.jmh.runner.options.OptionsBuilder;\nimport java.util.concurrent.TimeUnit;\n@State(Scope.Thread)\n@BenchmarkMode(Mode.AverageTime)\n@OutputTimeUnit(TimeUnit.NANOSECONDS)\n@Warmup(iterations = 5, time = 1, timeUnit = TimeUnit.SECONDS)\n@Measurement(iterations = 5, time = 1, timeUnit = TimeUnit.SECONDS)\n@Fork(1)\npublic class AccuracyBenchmark {\n    @Benchmark\n    public void measure() {\n        \/\/ \u7a7a\u6267\u884c\uff0c\u7528\u4e8e\u6a21\u62df\u4f18\u5316\u6389\u6d4b\u8bd5\u4ee3\u7801\u60c5\u666f\n    }\n    @Benchmark\n    public void measureSimpleMath(Blackhole blackhole) {\n        \/\/ \u7b80\u5355\u7684\u6570\u5b66\u8fd0\u7b97\uff0c\u7528\u4e8e\u6a21\u62df\u8f7b\u91cf\u7ea7\u64cd\u4f5c\n        blackhole.consume(add(1, 2));\n    }\n    @Benchmark\n    public void measureComplexMath(Blackhole blackhole) {\n        \/\/ \u590d\u6742\u7684\u6570\u5b66\u8fd0\u7b97\uff0c\u7528\u4e8e\u6a21\u62df\u91cd\u91cf\u7ea7\u64cd\u4f5c\n        blackhole.consume(calculate(123, 456, 789));\n    }\n    private int add(int a, int b) {\n        return a + b;\n    }\n    private int calculate(int a, int b, int c) {\n        int result = a;\n        for (int i = 0; i < b; i++) {\n            result += c;\n        }\n        return result;\n    }\n    \/\/ Blackhole\u6d88\u8017\u65b9\u6cd5\uff0c\u9632\u6b62JVM\u4f18\u5316\u6389\u6d4b\u8bd5\u4ee3\u7801\n    \/\/ \u4e3b\u65b9\u6cd5\uff0c\u7528\u4e8e\u8fd0\u884c\u57fa\u51c6\u6d4b\u8bd5\n    public static void main(String[] args) throws RunnerException {\n        Options opt = new OptionsBuilder()\n                .include(AccuracyBenchmark.class.getSimpleName())\n                .build();\n        new Runner(opt).run();\n    }\n}<\/code><\/pre>\n
\u8fd0\u884c\u4e0a\u8ff0\u4ee3\u7801\u540e\uff0cJMH\u4f1a\u8f93\u51fa\u7c7b\u4f3c\u4ee5\u4e0b\u7684\u6d4b\u8bd5\u7ed3\u679c\uff1a<\/em><\/p>\n
# Run complete. Total time: 00:00:33\n\nREMEMBER: The numbers below are just data. To gain reusable insights, you need to follow up on\nwhy the numbers are the way they are. Use profilers (see -prof, -lprof), design factorial\nexperiments, perform baseline and negative tests that provide experimental control, make sure\nthe benchmarking environment is safe on JVM\/OS\/HW level, ask for reviews from the domain experts.\nDo not assume the numbers tell you what you want them to tell.\n\nBenchmark                             Mode  Cnt  Score   Error  Units\nAccuracyBenchmark.measure             avgt    5  0.293 \u00b1 0.104  ns\/op\nAccuracyBenchmark.measureComplexMath  avgt    5  2.118 \u00b1 0.622  ns\/op\nAccuracyBenchmark.measureSimpleMath   avgt    5  2.222 \u00b1 0.539  ns\/op\n\nProcess finished with exit code 0<\/code><\/pre>\n
\u5728\u8fd9\u4e2a\u4f8b\u5b50\u4e2d\uff0c\u6211\u4eec\u4f7f\u7528\u4e86\u4ee5\u4e0bJMH\u7279\u6027\u6765\u786e\u4fdd\u6d4b\u8bd5\u7ed3\u679c\u7684\u51c6\u786e\u6027\uff1a<\/p>\n
    \n
  1. \u9884\u70ed\uff08Warmup\uff09\uff1a\u901a\u8fc7\u9884\u70ed\u8fed\u4ee3\uff0c\u6211\u4eec\u786e\u4fddJVM\u7684\u5373\u65f6\u7f16\u8bd1\u5668\uff08JIT\uff09\u6709\u8db3\u591f\u7684\u65f6\u95f4\u5bf9\u4ee3\u7801\u8fdb\u884c\u4f18\u5316\uff0c\u4ece\u800c\u6a21\u62df\u5b9e\u9645\u8fd0\u884c\u60c5\u51b5\u3002<\/li>\n
  2. \u591a\u6b21\u6d4b\u91cf\uff08Measurement\uff09\uff1a\u901a\u8fc7\u591a\u6b21\u6d4b\u91cf\u8fed\u4ee3\uff0c\u6211\u4eec\u53ef\u4ee5\u51cf\u5c11\u5076\u7136\u8bef\u5dee\u5e76\u8ba1\u7b97\u7edf\u8ba1\u4e0a\u663e\u8457\u7684\u7ed3\u679c\u3002<\/li>\n
  3. \u9694\u79bb\u6d4b\u8bd5\uff08Fork\uff09\uff1a\u901a\u8fc7\u5728\u5355\u72ec\u7684JVM\u8fdb\u7a0b\u4e2d\u8fd0\u884c\u6bcf\u4e2a\u57fa\u51c6\u6d4b\u8bd5\uff0c\u6211\u4eec\u907f\u514d\u4e86\u6d4b\u8bd5\u4e4b\u95f4\u7684\u76f8\u4e92\u5f71\u54cd\uff0c\u5e76\u786e\u4fdd\u6bcf\u4e2a\u6d4b\u8bd5\u90fd\u5728\u76f8\u540c\u7684\u521d\u59cb\u6761\u4ef6\u4e0b\u8fdb\u884c\u3002<\/li>\n
  4. Blackhole\u6d88\u8017\uff1aBlackhole\u662f\u4e00\u4e2aJMH\u63d0\u4f9b\u7684\u5de5\u5177\uff0c\u7528\u4e8e\u6d88\u8017\u6d4b\u8bd5\u65b9\u6cd5\u7684\u8f93\u51fa\uff0c\u9632\u6b62JVM\u4f18\u5316\u6389\u6d4b\u8bd5\u4ee3\u7801\uff08\u4f8b\u5982\uff0c\u6b7b\u4ee3\u7801\u6d88\u9664\uff09\u3002<\/li>\n<\/ol>\n
    \u8981\u8fd0\u884c\u8fd9\u4e2a\u57fa\u51c6\u6d4b\u8bd5\uff0c\u4f60\u53ef\u4ee5\u6267\u884cmain\u65b9\u6cd5\uff0cJMH\u4f1a\u8f93\u51fa\u6bcf\u4e2a\u65b9\u6cd5\u7684\u5e73\u5747\u6267\u884c\u65f6\u95f4\u3002\u8fd9\u4e2a\u4f8b\u5b50\u5c55\u793a\u4e86\u7b80\u5355\u6570\u5b66\u8fd0\u7b97\u548c\u590d\u6742\u6570\u5b66\u8fd0\u7b97\u7684\u6027\u80fd\u5dee\u5f02\u3002<\/p>\n
    \u8bf7\u6ce8\u610f\uff0c\u8fd9\u4e2a\u4f8b\u5b50\u662f\u4e00\u4e2a\u7b80\u5355\u7684\u57fa\u51c6\u6d4b\u8bd5\uff0c\u5b9e\u9645\u4f7f\u7528\u65f6\u53ef\u80fd\u9700\u8981\u66f4\u590d\u6742\u7684\u6d4b\u8bd5\u573a\u666f\u548c\u66f4\u591a\u7684\u914d\u7f6e\u3002\u6b64\u5916\uff0cJMH\u7684\u8f93\u51fa\u5e94\u8be5\u88ab\u89e3\u91ca\u4e3a\u8d8b\u52bf\u800c\u4e0d\u662f\u7edd\u5bf9\u503c\uff0c\u56e0\u4e3a\u6027\u80fd\u6d4b\u8bd5\u53d7\u5230\u5f88\u591a\u56e0\u7d20\u7684\u5f71\u54cd\uff0c\u5305\u62ecJVM\u72b6\u6001\u3001\u7cfb\u7edf\u8d1f\u8f7d\u7b49\u3002<\/strong><\/p>\n
    \u4e94\u3001JMH\u7684\u9ad8\u7ea7\u7279\u6027<\/h2>\n
    \u591a\u7ebf\u7a0b\u6d4b\u8bd5\u548c\u540c\u6b65<\/h3>\n
    JMH\u652f\u6301\u591a\u7ebf\u7a0b\u6d4b\u8bd5\uff0c\u5e76\u63d0\u4f9b\u4e86\u540c\u6b65\u673a\u5236\u4ee5\u786e\u4fdd\u6d4b\u8bd5\u7684\u51c6\u786e\u6027\u3002<\/p>\n
    \u5728JMH\u4e2d\u8fdb\u884c\u591a\u7ebf\u7a0b\u6d4b\u8bd5\u65f6\uff0c\u4f60\u9700\u8981\u4f7f\u7528@Threads\u6216@Fork\u6ce8\u89e3\u6765\u6307\u5b9a\u7ebf\u7a0b\u6570\u91cf\u3002\u4e3a\u4e86\u786e\u4fdd\u6240\u6709\u7ebf\u7a0b\u5728\u6d4b\u91cf\u9636\u6bb5\u540c\u65f6\u5f00\u59cb\u548c\u7ed3\u675f\uff0c\u53ef\u4ee5\u4f7f\u7528@Benchmark\u6ce8\u89e3\u7684syncIterations\u53c2\u6570\u3002<\/p>\n
    \u4ee5\u4e0b\u662f\u4e00\u4e2a\u4f7f\u7528JMH\u8fdb\u884c\u591a\u7ebf\u7a0b\u6d4b\u8bd5\u7684\u793a\u4f8b\uff1a<\/p>\n
    import org.openjdk.jmh.annotations.*;\nimport org.openjdk.jmh.runner.Runner;\nimport org.openjdk.jmh.runner.options.Options;\nimport org.openjdk.jmh.runner.options.OptionsBuilder;\n\nimport java.util.concurrent.TimeUnit;\n\n@State(Scope.Thread) \/\/ \u6bcf\u4e2a\u7ebf\u7a0b\u90fd\u6709\u81ea\u5df1\u7684\u72b6\u6001\n@BenchmarkMode(Mode.Throughput) \/\/ \u6d4b\u8bd5\u541e\u5410\u91cf\n@OutputTimeUnit(TimeUnit.SECONDS) \/\/ \u65f6\u95f4\u5355\u4f4d\u4e3a\u79d2\n@Warmup(iterations = 5) \/\/ \u9884\u70ed\u8fed\u4ee35\u6b21\npublic class MultiThreadBenchmark {\n\n    @Benchmark\n    @Threads(2) \/\/ \u6307\u5b9a\u4f7f\u75282\u4e2a\u7ebf\u7a0b\u6267\u884c\u6d4b\u8bd5\n    public void multiThreadTest() {\n        \/\/ \u8fd9\u91cc\u662f\u9700\u8981\u6d4b\u8bd5\u7684\u591a\u7ebf\u7a0b\u4ee3\u7801\n    }\n\n    \/\/ \u4e3b\u65b9\u6cd5\uff0c\u7528\u4e8e\u8fd0\u884c\u57fa\u51c6\u6d4b\u8bd5\n    public static void main(String[] args) throws Exception {\n        Options opt = new OptionsBuilder()\n                .include(MultiThreadBenchmark.class.getSimpleName())\n                .syncIterations(true) \/\/ \u542f\u7528\u540c\u6b65\u8fed\u4ee3\n                .build();\n        new Runner(opt).run();\n    }\n}<\/code><\/pre>\n
    \u5728\u8fd9\u4e2a\u4f8b\u5b50\u4e2d\uff0c\u6211\u4eec\u4f7f\u7528@Threads(2)\u6ce8\u89e3\u6765\u6307\u5b9a\u6d4b\u8bd5\u65b9\u6cd5multiThreadTest\u5c06\u57282\u4e2a\u7ebf\u7a0b\u4e2d\u5e76\u884c\u6267\u884c\uff0c\u4f7f\u7528syncIterations(true)\u786e\u4fdd\u6240\u6709\u7ebf\u7a0b\u5728\u6bcf\u4e2a\u6d4b\u91cf\u8fed\u4ee3\u4e2d\u540c\u6b65\u6267\u884c\u3002\u8fd9\u610f\u5473\u7740JMH\u5c06\u521b\u5efa2\u4e2a\u7ebf\u7a0b\uff0c\u6bcf\u4e2a\u7ebf\u7a0b\u90fd\u5c06\u6267\u884cmultiThreadTest\u65b9\u6cd5\u3002<\/p>\n
    \u5982\u679c\u4f60\u60f3\u8981\u66f4\u7ec6\u81f4\u5730\u63a7\u5236\u6bcf\u4e2a\u7ebf\u7a0b\u7684\u884c\u4e3a\uff0c\u4f60\u53ef\u4ee5\u4f7f\u7528@Group\u548c@GroupThreads\u6ce8\u89e3\u6765\u5b9a\u4e49\u7ebf\u7a0b\u7ec4\uff1a<\/p>\n
    import org.openjdk.jmh.annotations.*;\nimport org.openjdk.jmh.runner.Runner;\nimport org.openjdk.jmh.runner.options.Options;\nimport org.openjdk.jmh.runner.options.OptionsBuilder;\n\nimport java.util.concurrent.TimeUnit;\n\n@BenchmarkMode(Mode.Throughput) \/\/ \u6d4b\u8bd5\u541e\u5410\u91cf\n@OutputTimeUnit(TimeUnit.SECONDS) \/\/ \u65f6\u95f4\u5355\u4f4d\u4e3a\u79d2\n@Warmup(iterations = 5) \/\/ \u9884\u70ed\u8fed\u4ee35\u6b21\n@State(Scope.Group) \/\/ \u6bcf\u4e2a\u7ebf\u7a0b\u90fd\u6709\u81ea\u5df1\u7684\u72b6\u6001\npublic class ThreadGroupBenchmark {\n    private int counter;\n\n    @Setup(Level.Trial)\n    public void setUp() {\n        counter = 0;\n    }\n\n    @Benchmark\n    @GroupThreads(2)\n    @Group("testGroup")\n    public void increment( ThreadGroupState state) {\n        state.increment();\n    }\n\n    @Benchmark\n    @Group("testGroup")\n    public void decrement(ThreadGroupState state) {\n        state.decrement();\n    }\n\n    @State(Scope.Thread)\n    public static class ThreadGroupState {\n        private int value;\n\n        public void increment() {\n            value++;\n        }\n\n        public void decrement() {\n            value--;\n        }\n    }\n    \/\/ \u4e3b\u65b9\u6cd5\uff0c\u7528\u4e8e\u8fd0\u884c\u57fa\u51c6\u6d4b\u8bd5\n    public static void main(String[] args) throws Exception {\n        Options opt = new OptionsBuilder()\n                .include(ThreadGroupBenchmark.class.getSimpleName())\n                .syncIterations(true) \/\/ \u542f\u7528\u540c\u6b65\u8fed\u4ee3\n                .build();\n        new Runner(opt).run();\n    }\n}<\/code><\/pre>\n
    \u5728\u8fd9\u4e2a\u4f8b\u5b50\u4e2d\uff0c\u6211\u4eec\u5b9a\u4e49\u4e86\u4e00\u4e2a\u7ebf\u7a0b\u7ec4testGroup\uff0c\u5e76\u4f7f\u7528@GroupThreads(2)\u6ce8\u89e3\u6307\u5b9a\u6bcf\u4e2a\u7ebf\u7a0b\u7ec4\u67092\u4e2a\u7ebf\u7a0b\u3002increment\u548cdecrement\u65b9\u6cd5\u90fd\u5c5e\u4e8etestGroup\u7ebf\u7a0b\u7ec4\uff0c\u5b83\u4eec\u5c06\u5e76\u884c\u6267\u884c\u3002ThreadGroupState\u7c7b\u5b9a\u4e49\u4e86\u7ebf\u7a0b\u7ec4\u5171\u4eab\u7684\u72b6\u6001\u3002<\/p>\n
    \u8fd9\u4e24\u4e2a\u793a\u4f8b\u5c55\u793a\u4e86\u5982\u4f55\u5728JMH\u4e2d\u8bbe\u7f6e\u548c\u8fd0\u884c\u591a\u7ebf\u7a0b\u57fa\u51c6\u6d4b\u8bd5\u3002\u901a\u8fc7\u8fd9\u79cd\u65b9\u5f0f\uff0c\u4f60\u53ef\u4ee5\u8bc4\u4f30\u5e76\u53d1\u4ee3\u7801\u5728\u591a\u7ebf\u7a0b\u73af\u5883\u4e2d\u7684\u6027\u80fd\u3002<\/p>\n
    \u53c2\u6570\u5316\u6d4b\u8bd5<\/h4>\n
    \u5728JMH\u4e2d\u5b9e\u73b0\u53c2\u6570\u5316\u6d4b\u8bd5\uff0c\u53ef\u4ee5\u4f7f\u7528@Param\u6ce8\u89e3\u6765\u4e3a\u57fa\u51c6\u6d4b\u8bd5\u65b9\u6cd5\u63d0\u4f9b\u4e0d\u540c\u7684\u53c2\u6570\u503c\u3002\u8fd9\u79cd\u65b9\u5f0f\u7279\u522b\u9002\u5408\u4e8e\u6d4b\u91cf\u65b9\u6cd5\u6027\u80fd\u4e0e\u53c2\u6570\u53d6\u503c\u4e4b\u95f4\u7684\u5173\u7cfb\u3002\u4e0b\u9762\u662f\u4e00\u4e2a\u53c2\u6570\u5316\u6d4b\u8bd5\u7684\u793a\u4f8b\uff1a<\/p>\n
    import org.openjdk.jmh.annotations.*;\nimport org.openjdk.jmh.runner.Runner;\nimport org.openjdk.jmh.runner.RunnerException;\nimport org.openjdk.jmh.runner.options.Options;\nimport org.openjdk.jmh.runner.options.OptionsBuilder;\n\nimport java.util.concurrent.TimeUnit;\n\n@State(Scope.Thread)\n@BenchmarkMode(Mode.AverageTime)\n@OutputTimeUnit(TimeUnit.NANOSECONDS)\n@Warmup(iterations = 5, time = 1, timeUnit = TimeUnit.SECONDS)\n@Measurement(iterations = 5, time = 1, timeUnit = TimeUnit.SECONDS)\n@Fork(1)\npublic class ParametrizedBenchmark {\n    @Param({"1", "10", "100"})\n    private int numberOfElements;\n\n    private int[] array;\n\n    @Setup\n    public void setup() {\n        array = new int[numberOfElements];\n        for (int i = 0; i < numberOfElements; i++) {\n            array[i] = i;\n        }\n    }\n\n    @Benchmark\n    public int sumArray() {\n        int sum = 0;\n        for (int value : array) {\n            sum += value;\n        }\n        return sum;\n    }\n\n    public static void main(String[] args) throws RunnerException {\n        Options opt = new OptionsBuilder()\n                .include(ParametrizedBenchmark.class.getSimpleName())\n                .forks(1)\n                .warmupIterations(5)\n                .measurementIterations(5)\n                .build();\n\n\n        new Runner(opt).run();\n    }\n}<\/code><\/pre>\n
    \u5728\u8fd9\u4e2a\u4f8b\u5b50\u4e2d\uff0c@Param\u6ce8\u89e3\u7528\u4e8e\u5b9a\u4e49\u53c2\u6570numberOfElements\uff0c\u5b83\u5c06\u53d6\u4e09\u4e2a\u4e0d\u540c\u7684\u503c\uff1a1\u300110\u548c100\u3002setup\u65b9\u6cd5\u7528\u4e8e\u521d\u59cb\u5316\u6570\u7ec4\uff0csumArray\u65b9\u6cd5\u7528\u4e8e\u8ba1\u7b97\u6570\u7ec4\u5143\u7d20\u7684\u603b\u548c\u3002JMH\u5c06\u4e3a\u6bcf\u4e2a\u53c2\u6570\u503c\u8fd0\u884c\u57fa\u51c6\u6d4b\u8bd5\uff0c\u5e76\u751f\u6210\u76f8\u5e94\u7684\u7ed3\u679c\u3002<\/p>\n
    \u8fd9\u79cd\u65b9\u5f0f\u5141\u8bb8\u4f60\u7528\u4e00\u4e2a\u6d4b\u8bd5\u65b9\u6cd5\u6765\u8986\u76d6\u591a\u79cd\u8f93\u5165\u60c5\u51b5\u4e0b\u7684\u6027\u80fd\u6d4b\u8bd5\uff0c\u4ece\u800c\u66f4\u5168\u9762\u5730\u4e86\u89e3\u4ee3\u7801\u7684\u6027\u80fd\u8868\u73b0\u3002<\/p>\n
    \u63a7\u5236JVM\u7684\u7f16\u8bd1\u4f18\u5316<\/h4>\n
    @CompilerControl\u6ce8\u89e3\u662fJMH\u63d0\u4f9b\u7684\u4e00\u4e2a\u9ad8\u7ea7\u7279\u6027\uff0c\u5b83\u5141\u8bb8\u6d4b\u8bd5\u4f5c\u8005\u7cbe\u786e\u63a7\u5236JVM\u7684\u7f16\u8bd1\u884c\u4e3a\u3002\u8fd9\u5728\u57fa\u51c6\u6d4b\u8bd5\u4e2d\u975e\u5e38\u6709\u7528\uff0c\u56e0\u4e3a\u5b83\u53ef\u4ee5\u9632\u6b62JVM\u4f18\u5316\u6389\u6d4b\u8bd5\u4ee3\u7801\uff0c\u4ece\u800c\u786e\u4fdd\u6d4b\u8bd5\u7ed3\u679c\u7684\u51c6\u786e\u6027\u3002<\/p>\n
    \u4ee5\u4e0b\u662f\u5982\u4f55\u4f7f\u7528@CompilerControl\u6ce8\u89e3\u6765\u63a7\u5236JVM\u7684\u7f16\u8bd1\u4f18\u5316\u7684\u4e00\u4e2a\u793a\u4f8b\uff1a<\/p>\n
    import org.openjdk.jmh.annotations.*;\nimport org.openjdk.jmh.infra.Blackhole;\nimport org.openjdk.jmh.runner.Runner;\nimport org.openjdk.jmh.runner.RunnerException;\nimport org.openjdk.jmh.runner.options.Options;\nimport org.openjdk.jmh.runner.options.OptionsBuilder;\n\nimport java.util.concurrent.TimeUnit;\n\n@State(Scope.Thread)\n@BenchmarkMode(Mode.AverageTime)\n@OutputTimeUnit(TimeUnit.NANOSECONDS)\n@Warmup(iterations = 5, time = 1, timeUnit = TimeUnit.SECONDS)\n@Measurement(iterations = 5, time = 1, timeUnit = TimeUnit.SECONDS)\n@Fork(1)\npublic class CompilerControlExample {\n\n    @CompilerControl(CompilerControl.Mode.DONT_INLINE)\n    public static int doNotInlineMe(int x) {\n        \/\/ \u8fd9\u4e2a\u65b9\u6cd5\u4e0d\u4f1a\u88ab\u5185\u8054\uff0c\u5373\u4f7f\u5b83\u662f\u4e00\u4e2a\u7b80\u5355\u7684\u65b9\u6cd5\n        return x + 42;\n    }\n\n    @Benchmark\n    @Threads(1) \/\/ \u5355\u7ebf\u7a0b\u6267\u884c\n    public void testWithCompilerControl(Blackhole bh) {\n        int result = doNotInlineMe(1);\n        bh.consume(result);\n    }\n\n    @Benchmark\n    @Threads(1) \/\/ \u5355\u7ebf\u7a0b\u6267\u884c\n    public void testWithoutCompilerControl(Blackhole bh) {\n        int result = inlineMe(1);\n        bh.consume(result);\n    }\n\n    \/\/ \u8fd9\u662f\u4e00\u4e2a\u53ef\u80fd\u4f1a\u88abJVM\u5185\u8054\u7684\u7b80\u5355\u65b9\u6cd5\n    public static int inlineMe(int x) {\n        return x + 42;\n    }\n\n    \/\/ \u4e3b\u65b9\u6cd5\uff0c\u7528\u4e8e\u8fd0\u884c\u57fa\u51c6\u6d4b\u8bd5\n    public static void main(String[] args) throws RunnerException {\n        Options opt = new OptionsBuilder()\n                .include(CompilerControlExample.class.getSimpleName())\n                .build();\n        new Runner(opt).run();\n    }<\/code><\/pre>\n
    \u5728\u8fd9\u4e2a\u4f8b\u5b50\u4e2d\uff0cdoNotInlineMe\u65b9\u6cd5\u7528\u4e86@CompilerControl(CompilerControl.Mode.DONT_INLINE)\u6ce8\u89e3\uff0c\u8fd9\u544a\u8bc9JMH\u548cJVM\u4e0d\u8981\u5185\u8054\u8fd9\u4e2a\u65b9\u6cd5\uff0c\u5373\u4f7f\u5b83\u662f\u4e00\u4e2a\u7b80\u5355\u7684\u65b9\u6cd5\u3002\u8fd9\u53ef\u4ee5\u9632\u6b62JVM\u7684\u5373\u65f6\u7f16\u8bd1\u5668\uff08JIT\uff09\u5728\u6d4b\u8bd5\u8fc7\u7a0b\u4e2d\u4f18\u5316\u6389\u8fd9\u4e2a\u65b9\u6cd5\u3002testWithCompilerControl\u57fa\u51c6\u6d4b\u8bd5\u65b9\u6cd5\u8c03\u7528\u4e86doNotInlineMe\u65b9\u6cd5\uff0c\u5e76\u4e14\u5b83\u7684\u7ed3\u679c\u88ab\u4f20\u9012\u7ed9\u4e86Blackhole\uff0c\u8fd9\u662f\u4e00\u4e2a\u7528\u6765\u9632\u6b62\u7f16\u8bd1\u5668\u4f18\u5316\u6389\u6d4b\u8bd5\u4ee3\u7801\u7684\u5de5\u5177\u3002<\/p>\n
    \u53e6\u4e00\u65b9\u9762\uff0cinlineMe\u65b9\u6cd5\u662f\u4e00\u4e2a\u53ef\u80fd\u4f1a\u88abJVM\u5185\u8054\u7684\u7b80\u5355\u65b9\u6cd5\uff0ctestWithoutCompilerControl\u57fa\u51c6\u6d4b\u8bd5\u65b9\u6cd5\u8c03\u7528\u4e86\u8fd9\u4e2a\u65b9\u6cd5\uff0c\u5e76\u4e14\u6ca1\u6709\u4f7f\u7528@CompilerControl\u6ce8\u89e3\u3002<\/p>\n
    \u901a\u8fc7\u6bd4\u8f83\u8fd9\u4e24\u4e2a\u6d4b\u8bd5\u65b9\u6cd5\u7684\u7ed3\u679c\uff0c\u4f60\u53ef\u4ee5\u89c2\u5bdf\u5230\u662f\u5426\u5185\u8054\u5bf9\u6027\u80fd\u6d4b\u8bd5\u7ed3\u679c\u7684\u5f71\u54cd\u3002\u8fd9\u79cd\u63a7\u5236\u5bf9\u4e8e\u786e\u4fdd\u57fa\u51c6\u6d4b\u8bd5\u7684\u51c6\u786e\u6027\u975e\u5e38\u91cd\u8981\u3002\u4ee5\u4e0b\u662f\u8dd1\u5b8c\u8fd9\u4e2a\u4f8b\u5b50JMH\u8f93\u51fa\u7684\u6d4b\u8bd5\u7ed3\u679c\uff1a<\/p>\n
    # Run complete. Total time: 00:00:21\n\nREMEMBER: The numbers below are just data. To gain reusable insights, you need to follow up on\nwhy the numbers are the way they are. Use profilers (see -prof, -lprof), design factorial\nexperiments, perform baseline and negative tests that provide experimental control, make sure\nthe benchmarking environment is safe on JVM\/OS\/HW level, ask for reviews from the domain experts.\nDo not assume the numbers tell you what you want them to tell.\n\nBenchmark                                          Mode  Cnt  Score   Error  Units\nCompilerControlExample.testWithCompilerControl     avgt    5  2.916 \u00b1 0.333  ns\/op\nCompilerControlExample.testWithoutCompilerControl  avgt    5  1.857 \u00b1 0.094  ns\/op<\/code><\/pre>\n
    \u516d\u3001\u7f16\u5199\u6709\u6548\u7684\u57fa\u51c6\u6d4b\u8bd5<\/h2>\n
    \u907f\u514d\u5e38\u89c1\u7684\u6027\u80fd\u6d4b\u8bd5\u9677\u9631<\/h4>\n
    \u73b0\u5728\u6211\u4eec\u5df2\u7ecf\u4e86\u89e3\u4e86\u5982\u4f55\u4f7f\u7528JMH\u7f16\u5199\u57fa\u51c6\u6d4b\u8bd5\uff0c\u73b0\u5728\u662f\u65f6\u5019\u8ba8\u8bba\u5982\u4f55\u7f16\u5199\u6b63\u786e\u7684\u57fa\u51c6\u6d4b\u8bd5\u4e86\u3002\u5728\u5199\u57fa\u51c6\u6d4b\u8bd5\u65f6\uff0c\u6211\u4eec\u5f88\u5bb9\u6613\u9677\u5165\u51e0\u4e2a\u9677\u9631\u3002\u6211\u5c06\u5728\u4ee5\u4e0b\u90e8\u5206\u8ba8\u8bba\u5176\u4e2d\u4e00\u4e9b\u9677\u9631\u3002<\/p>\n
    \u4e00\u4e2a\u5e38\u89c1\u7684\u9677\u9631\u662f\uff0cJVM\u53ef\u80fd\u4f1a\u5728\u57fa\u51c6\u6d4b\u8bd5\u4e2d\u6267\u884c\u65f6\u5bf9\u60a8\u7684\u4ee3\u7801\u8fdb\u884c\u4f18\u5316\uff0c\u800c\u5982\u679c\u4ee3\u7801\u5728\u60a8\u7684\u5b9e\u9645\u5e94\u7528\u7a0b\u5e8f\u4e2d\u6267\u884c\uff0c\u5219\u65e0\u6cd5\u5e94\u7528\u8fd9\u4e9b\u4f18\u5316\u3002\u6b64\u7c7b\u4f18\u5316\u5c06\u4f7f\u60a8\u7684\u4ee3\u7801\u770b\u8d77\u6765\u6bd4\u5b9e\u9645\u8fd0\u884c\u901f\u5ea6\u66f4\u5feb\u3002<\/p>\n
    \u5faa\u73af\u4f18\u5316<\/h5>\n
    \u6211\u4eec\u5f88\u5bb9\u6613\u5c06\u57fa\u51c6\u6d4b\u8bd5\u4ee3\u7801\u653e\u5728\u57fa\u51c6\u6d4b\u8bd5\u65b9\u6cd5\u7684\u5faa\u73af\u4e2d\uff0c\u4ee5\u4fbf\u5728\u6bcf\u6b21\u8c03\u7528\u57fa\u51c6\u6d4b\u8bd5\u65b9\u6cd5\u65f6\u91cd\u590d\u591a\u6b21\uff08\u4ee5\u51cf\u5c11\u57fa\u51c6\u6d4b\u8bd5\u65b9\u6cd5\u8c03\u7528\u7684\u5f00\u9500\uff09\u3002\u4f46\u662f\uff0cJVM\u975e\u5e38\u64c5\u957f\u4f18\u5316\u5faa\u73af\uff0c\u56e0\u6b64\u6700\u7ec8\u7ed3\u679c\u53ef\u80fd\u4e0e\u9884\u671f\u4e0d\u540c\u3002\u4e00\u822c\u6765\u8bf4\uff0c\u60a8\u5e94\u8be5\u907f\u514d\u5728\u57fa\u51c6\u6d4b\u8bd5\u65b9\u6cd5\u4e2d\u4f7f\u7528\u5faa\u73af\u3002\u800c\u662f\u4f7f\u7528 @OperationsPerInvocation \u6ce8\u89e3\u6765\u544a\u8bc9JMH\u6bcf\u6b21\u8fed\u4ee3\u5e94\u8be5\u6267\u884c\u591a\u5c11\u6b21\u64cd\u4f5c\u3002\u6bd4\u5982\u8fd9\u4e2a\u57fa\u51c6\u6d4b\u8bd5\u793a\u4f8b\uff1a<\/p>\n
    @Benchmark\n@OperationsPerInvocation(1000)\npublic void measureLoop() {\n    for (int i = 0; i < 1000; i++) {\n        \/\/ ...\n    }\n}<\/code><\/pre>\n
    \u6d88\u9664\u6b7b\u4ee3\u7801<\/h5>\n
    \u6267\u884c\u6027\u80fd\u57fa\u51c6\u6d4b\u8bd5\u65f6\u8981\u907f\u514d\u7684JVM\u4f18\u5316\u4e4b\u4e00\u662f\u6d88\u9664\u6b7b\u4ee3\u7801\u3002\u5982\u679cJVM\u68c0\u6d4b\u5230\u67d0\u4e9b\u8ba1\u7b97\u7684\u7ed3\u679c\u4ece\u672a\u4f7f\u7528\u8fc7\uff0cJVM\u53ef\u80fd\u4f1a\u8ba4\u4e3a\u8be5\u8ba1\u7b97\u662f\u6b7b\u4ee3\u7801\u5e76\u5c06\u5176\u6d88\u9664\u3002\u6bd4\u5982\u4e0b\u9762\u8fd9\u4e2a\u57fa\u51c6\u6d4b\u8bd5\u793a\u4f8b\uff1a<\/p>\n
    import org.openjdk.jmh.annotations.Benchmark;\n\npublic class MyBenchmark {\n\n    @Benchmark\n    public void testMethod() {\n        int a = 1;\n        int b = 2;\n        int sum = a + b;\n    }\n}<\/code><\/pre>\n
    JVM \u53ef\u4ee5\u68c0\u6d4b\u5230a+b\u5206\u914d\u7ed9\u7684sum\u4ece\u672a\u4f7f\u7528\u8fc7\u3002\u56e0\u6b64\uff0cJVM\u53ef\u4ee5\u5b8c\u5168\u5220\u9664sum\u7684\u8ba1\u7b97\u3002\u6700\u540e\uff0c\u57fa\u51c6\u6d4b\u8bd5\u4e2d\u6ca1\u6709\u7559\u4e0b\u4efb\u4f55\u4ee3\u7801\u3002\u56e0\u6b64\uff0c\u8fd0\u884c\u6b64\u57fa\u51c6\u6d4b\u8bd5\u7684\u7ed3\u679c\u5177\u6709\u5f88\u5927\u7684\u8bef\u5bfc\u6027\u3002\u57fa\u51c6\u6d4b\u8bd5\u5b9e\u9645\u4e0a\u5e76\u6ca1\u6709\u6d4b\u91cf\u6dfb\u52a0\u4e24\u4e2a\u53d8\u91cf\u5e76\u5c06\u503c\u5206\u914d\u7ed9\u7b2c\u4e09\u4e2a\u53d8\u91cf\u7684\u65f6\u95f4\u3002\u57fa\u51c6\u6d4b\u8bd5\u6839\u672c\u6ca1\u6709\u6d4b\u91cf\u4efb\u4f55\u4ee3\u7801\u903b\u8f91\u3002<\/p>\n
    \u907f\u514d\u6d88\u9664\u6b7b\u4ee3\u7801<\/strong><\/p>\n
    \u4e3a\u4e86\u907f\u514d\u6d88\u9664\u6b7b\u4ee3\u7801\uff0c\u6211\u4eec\u5fc5\u987b\u786e\u4fdd\u8981\u6d4b\u91cf\u7684\u4ee3\u7801\u5bf9JVM\u6765\u8bf4\u4e0d\u50cf\u6b7b\u4ee3\u7801\u3002\u6709\u4e24\u79cd\u65b9\u6cd5\u53ef\u4ee5\u505a\u5230\u8fd9\u4e00\u70b9\u3002<\/p>\n
      \n
    • \u4ece\u57fa\u51c6\u6d4b\u8bd5\u65b9\u6cd5\u8fd4\u56de\u4ee3\u7801\u7684\u7ed3\u679c\u3002<\/li>\n
    • \u5c06\u8ba1\u7b97\u51fa\u7684\u503c\u4f20\u9012\u5230JMH\u63d0\u4f9b\u7684Blackhole\u4e2d\u3002<\/li>\n<\/ul>\n
      \u4ee5\u4e0b\u662f\u8fd9\u4e24\u79cd\u65b9\u6cd5\u7684\u793a\u4f8b\uff1a<\/p>\n
      \u57fa\u51c6\u6d4b\u8bd5\u65b9\u6cd5\u7684\u8fd4\u56de\u503c<\/strong>
      \u4eceJMH\u57fa\u51c6\u6d4b\u8bd5\u65b9\u6cd5\u8fd4\u56de\u8ba1\u7b97\u503c\u5982\u4e0b\u6240\u793a\uff1a<\/p>\n
      import org.openjdk.jmh.annotations.Benchmark;\n\npublic class MyBenchmark {\n\n    @Benchmark\n    public int testMethod() {\n        int a = 1;\n        int b = 2;\n        int sum = a + b;\n        return sum;\n    }\n\n}<\/code><\/pre>\n
      \u6ce8\u610ftestMethod()\u65b9\u6cd5\u73b0\u5728\u4f1a\u8fd4\u56desum\u53d8\u91cf\u3002\u8fd9\u6837\uff0cJVM\u5c31\u4e0d\u80fd\u76f4\u63a5\u6d88\u9664\u4ee3\u7801\uff0c\u56e0\u4e3a\u8fd4\u56de\u503c\u53ef\u80fd\u4f1a\u88ab\u8c03\u7528\u8005\u4f7f\u7528\u3002\u5982\u679c\u4f60\u7684\u57fa\u51c6\u6d4b\u8bd5\u65b9\u6cd5\u6b63\u5728\u8ba1\u7b97\u6700\u7ec8\u53ef\u80fd\u88ab\u89c6\u4e3a\u6b7b\u4ee3\u7801\u800c\u88ab\u6d88\u9664\u7684\u591a\u4e2a\u503c\uff0c\u90a3\u4e48\u60a8\u53ef\u4ee5\u5c06\u4e24\u4e2a\u503c\u7ec4\u5408\u4e3a\u4e00\u4e2a\uff0c\u7136\u540e\u8fd4\u56de\u8be5\u503c\uff08\u4f8b\u5982\uff0c\u5305\u542b\u4e24\u4e2a\u503c\u7684\u5bf9\u8c61\uff09\u3002<\/p>\n
      \u5c06\u503c\u4f20\u9012\u7ed9Blackhole<\/strong><\/p>\n
      \u8fd4\u56de\u7ec4\u5408\u503c\u7684\u53e6\u4e00\u79cd\u65b9\u6cd5\u662f\u5c06\u8ba1\u7b97\u503c\u4f20\u9012\u5230JMH\u63d0\u4f9b\u7684Blackhole\u53d8\u91cf\u4e2d\u3002\u5c06\u503c\u4f20\u9012\u5230Blackhole\u7684\u65b9\u5f0f\u5982\u4e0b\uff1a<\/p>\n
      import org.openjdk.jmh.annotations.Benchmark;\nimport org.openjdk.jmh.infra.Blackhole;\n\npublic class MyBenchmark {\n\n    @Benchmark\n   public void testMethod(Blackhole blackhole) {\n        int a = 1;\n        int b = 2;\n        int sum = a + b;\n        blackhole.consume(sum);\n    }\n}<\/code><\/pre>\n
      testMethod()\u57fa\u51c6\u6d4b\u8bd5\u65b9\u6cd5\u73b0\u5728\u5c06Blackhole\u5bf9\u8c61\u4f5c\u4e3a\u53c2\u6570\u3002\u8c03\u7528\u65f6\uff0cJMH\u5c06\u5411\u6d4b\u8bd5\u65b9\u6cd5\u63d0\u4f9b\u8be5\u53c2\u6570\u3002<\/p>\n
      \u8fd8\u8981\u6ce8\u610f\u53d8\u91cf\u4e2d\u8ba1\u7b97\u51fa\u7684\u603b\u548csum\u73b0\u5728\u662f\u4f20\u9012\u7ed9\u4e86\u5b9e\u4f8bBlackhole\u7684consume()\u65b9\u6cd5\u3002\u8fd9\u6837JVM\u4f1a\u8ba4\u4e3asum\u53d8\u91cf\u4f1a\u88ab\u4f7f\u7528\u3002\u5982\u679c\u60a8\u7684\u57fa\u51c6\u6d4b\u8bd5\u65b9\u6cd5\u4ea7\u751f\u591a\u4e2a\u7ed3\u679c\uff0c\u60a8\u53ef\u4ee5\u5c06\u8fd9\u4e9b\u7ed3\u679c\u90fd\u4f20\u9012\u7ed9Blackhole\u3002<\/p>\n
      \u5e38\u91cf\u6298\u53e0<\/h5>\n
      \u5e38\u91cf\u6298\u53e0\u662f\u53e6\u4e00\u79cd\u5e38\u89c1\u7684JVM\u4f18\u5316\u3002\u57fa\u4e8e\u5e38\u91cf\u7684\u8ba1\u7b97\u901a\u5e38\u4f1a\u5bfc\u81f4\u5b8c\u5168\u76f8\u540c\u7684\u7ed3\u679c\uff0c\u65e0\u8bba\u6267\u884c\u591a\u5c11\u6b21\u8ba1\u7b97\u3002JVM\u53ef\u80fd\u4f1a\u68c0\u6d4b\u5230\u8fd9\u4e00\u70b9\uff0c\u5e76\u7528\u8ba1\u7b97\u7ed3\u679c\u66ff\u6362\u8be5\u8ba1\u7b97\u3002<\/p>\n
      \u4e3e\u4e2a\u4f8b\u5b50\uff0c\u770b\u4e00\u4e0b\u8fd9\u4e2a\u57fa\u51c6\u6d4b\u8bd5\uff1a<\/p>\n
      import org.openjdk.jmh.annotations.Benchmark;\n\npublic class MyBenchmark {\n\n    @Benchmark\n    public int testMethod() {\n        int a = 1;\n        int b = 2;\n        int sum = a + b;\n        return sum;\n    }\n\n}<\/code><\/pre>\n
      JVM\u4f1a\u68c0\u6d4b\u5230sum\u7684\u503c\u662f\u57fa\u4e8e1\u548c2\u8fd9\u4e24\u4e2a\u5e38\u91cf\u503c\u7684\u548c \u3002\u56e0\u6b64\uff0c\u5b83\u53ef\u4ee5\u5c06\u4e0a\u8ff0\u4ee3\u7801\u66ff\u6362\u4e3a\u4ee5\u4e0b\u5185\u5bb9\uff1a<\/p>\n
      import org.openjdk.jmh.annotations.Benchmark;\n\npublic class MyBenchmark {\n\n    @Benchmark\n    public int testMethod() {\n        int sum = 3;\n        return sum;\n    }\n\n}<\/code><\/pre>\n
      \u6216\u8005\u76f4\u63a5return 3\u3002<\/p>\n
      \u907f\u514d\u5e38\u91cf\u6298\u53e0<\/strong><\/p>\n
      \u4e3a\u4e86\u907f\u514d\u5e38\u91cf\u6298\u53e0\uff0c\u6211\u4eec\u4e0d\u80fd\u5c06\u5e38\u91cf\u786c\u7f16\u7801\u5230\u57fa\u51c6\u6d4b\u8bd5\u65b9\u6cd5\u4e2d\u3002\u76f8\u53cd\uff0c\u8ba1\u7b97\u7684\u8f93\u5165\u5e94\u8be5\u6765\u81ea\u72b6\u6001\u5bf9\u8c61\u3002\u8fd9\u4f7f\u5f97JVM\u5f88\u96be\u770b\u51fa\u8ba1\u7b97\u662f\u57fa\u4e8e\u5e38\u91cf\u503c\u7684\u3002\u4ee5\u4e0b\u662f\u4e00\u4e2a\u4f8b\u5b50\uff1a<\/p>\n
      import org.openjdk.jmh.annotations.*;\n\npublic class MyBenchmark {\n\n    @State(Scope.Thread)\n    public static class MyState {\n        public int a = 1;\n        public int b = 2;\n    }\n\n\n    @Benchmark \n    public int testMethod(MyState state) {\n        int sum = state.a + state.b;\n        return sum;\n    }\n}<\/code><\/pre>\n
      \u5982\u679c\u4f60\u7684\u57fa\u51c6\u6d4b\u8bd5\u65b9\u6cd5\u8ba1\u7b97\u4e86\u591a\u4e2a\u503c\uff0c\u4f60\u53ef\u4ee5\u5c06\u5b83\u4eec\u4f20\u9012\u5230Blackhole\u800c\u4e0d\u662f\u8fd4\u56de\u5b83\u4eec\uff0c\u8fd9\u6837\u4e5f\u53ef\u4ee5\u907f\u514d\u6b7b\u4ee3\u7801\u6d88\u9664\u4f18\u5316\u3002\u4f8b\u5982\uff1a<\/p>\n
       @Benchmark \n    public void testMethod(MyState state, Blackhole blackhole) { \n        int sum1 = state.a + state.b; \n        int sum2 = state.a + state.a + state.b + state.b; \n        blackhole.consume(sum1); \n        blackhole.consume(sum2); \n    }<\/code><\/pre>\n
      \u4e03\u3001JMH\u6d4b\u8bd5\u7ed3\u679c\u5206\u6790<\/h2>\n
      \u89e3\u8bfbJMH\u8f93\u51fa\u7684\u62a5\u544a<\/h4>\n
      \u6bcf\u6b21\u8dd1\u5b8c\u57fa\u51c6\u6d4b\u8bd5\uff0cJMH\u90fd\u4f1a\u8f93\u51fa\u8be6\u7ec6\u7684\u6d4b\u8bd5\u62a5\u544a\uff0c\u5305\u62ec\u5e73\u5747\u65f6\u95f4\u3001\u541e\u5410\u91cf\u3001\u5355\u6b21\u64cd\u4f5c\u65f6\u95f4\u3001\u7edf\u8ba1\u8bef\u5dee\u7b49\u3002\u5206\u6790\u8fd9\u4e9b\u7ed3\u679c\u65f6\uff0c\u4f60\u9700\u8981\u5173\u6ce8\u51e0\u4e2a\u5173\u952e\u70b9\uff1a<\/p>\n
        \n
      1. \u541e\u5410\u91cf\uff08Throughput\uff09\uff1a\u8868\u793a\u5355\u4f4d\u65f6\u95f4\u5185\u53ef\u4ee5\u5b8c\u6210\u7684\u64cd\u4f5c\u6570\u91cf\u3002<\/li>\n
      2. \u5e73\u5747\u65f6\u95f4\uff08Average Time\uff09\uff1a\u8868\u793a\u5b8c\u6210\u4e00\u6b21\u64cd\u4f5c\u6240\u9700\u7684\u5e73\u5747\u65f6\u95f4\u3002<\/li>\n
      3. \u6837\u672c\u65f6\u95f4\uff08Sample Time\uff09\uff1a\u57fa\u4e8e\u91c7\u6837\u7684\u6267\u884c\u65f6\u95f4\uff0c\u901a\u5e38\u5305\u542b\u767e\u5206\u4f4d\u6570\u7edf\u8ba1\u3002<\/li>\n
      4. \u5355\u6b21\u6267\u884c\u65f6\u95f4\uff08Single Shot Time\uff09\uff1a\u8868\u793a\u5355\u6b21\u6267\u884c\u64cd\u4f5c\u6240\u9700\u7684\u65f6\u95f4\uff0c\u7528\u4e8e\u6d4b\u8bd5\u51b7\u542f\u52a8\u6027\u80fd\u3002<\/li>\n
      5. \u7edf\u8ba1\u8bef\u5dee\uff08Score Error\uff09\uff1a\u8868\u793a\u6d4b\u8bd5\u7ed3\u679c\u7684\u53ef\u53d8\u6027\uff0c\u8bef\u5dee\u8d8a\u5c0f\uff0c\u7ed3\u679c\u8d8a\u7a33\u5b9a\u3002<\/li>\n<\/ol>\n
        \u4ee5\u4e0b\u662f\u4e00\u4e2a\u7b80\u5355\u7684JMH\u6d4b\u8bd5\u793a\u4f8b\uff0c\u6211\u4eec\u4f1a\u6839\u636e\u8dd1\u5b8c\u8fd9\u4e2a\u5b9e\u4f8b\u518d\u6765\u5206\u6790\u751f\u6210\u7684\u7ed3\u679c\uff1a<\/p>\n
        import org.openjdk.jmh.annotations.Benchmark;\nimport org.openjdk.jmh.annotations.BenchmarkMode;\nimport org.openjdk.jmh.annotations.Mode;\nimport org.openjdk.jmh.annotations.OutputTimeUnit;\nimport org.openjdk.jmh.annotations.Warmup;\nimport org.openjdk.jmh.annotations.Measurement;\nimport org.openjdk.jmh.annotations.Fork;\nimport org.openjdk.jmh.runner.Runner;\nimport org.openjdk.jmh.runner.RunnerException;\nimport org.openjdk.jmh.runner.options.Options;\nimport org.openjdk.jmh.runner.options.OptionsBuilder;\n\nimport java.util.concurrent.TimeUnit;\n\n@BenchmarkMode(Mode.AverageTime)\n@OutputTimeUnit(TimeUnit.NANOSECONDS)\n@Warmup(iterations = 5)\n@Measurement(iterations = 5)\n@Fork(1)\npublic class AnalysisBenchmark {\n\n    @Benchmark\n    public void measureMethod() {\n        \/\/ \u6d4b\u8bd5\u65b9\u6cd5\n    }\n\n    public static void main(String[] args) throws RunnerException {\n        Options opt = new OptionsBuilder()\n                .include(AnalysisBenchmark.class.getSimpleName())\n                .build();\n        new Runner(opt).run();\n    }\n}<\/code><\/pre>\n
        \u8fd0\u884c\u4e0a\u8ff0\u4ee3\u7801\u540e\uff0cJMH\u4f1a\u8f93\u51fa\u7c7b\u4f3c\u4ee5\u4e0b\u7684\u6d4b\u8bd5\u7ed3\u679c\uff1a<\/p>\n
        # Run complete. Total time: 00:01:41\n\nREMEMBER: The numbers below are just data. To gain reusable insights, you need to follow up on\nwhy the numbers are the way they are. Use profilers (see -prof, -lprof), design factorial\nexperiments, perform baseline and negative tests that provide experimental control, make sure\nthe benchmarking environment is safe on JVM\/OS\/HW level, ask for reviews from the domain experts.\nDo not assume the numbers tell you what you want them to tell.\n\nBenchmark                        Mode  Cnt  Score   Error  Units\nAnalysisBenchmark.measureMethod  avgt    5  0.268 \u00b1 0.070  ns\/op<\/code><\/pre>\n
        \u6211\u4eec\u53ef\u4ee5\u4ece\u6d4b\u8bd5\u7ed3\u679c\u5206\u6790\u5230\u5982\u4e0b\u4fe1\u606f\uff1a<\/strong><\/p>\n
          \n
        1. Score\uff08\u5206\u6570\uff09\uff1a0.268 ns\/op\u8868\u793a\u6bcf\u6b21\u64cd\u4f5c\u7684\u5e73\u5747\u65f6\u95f4\u662f0.268\u7eb3\u79d2\u3002<\/li>\n
        2. Error\uff08\u8bef\u5dee\uff09\uff1a\u00b10.070%\u8868\u793a\u6d4b\u8bd5\u7ed3\u679c\u7684\u8bef\u5dee\u7387\uff0c\u8bef\u5dee\u8d8a\u5c0f\uff0c\u6d4b\u8bd5\u7ed3\u679c\u8d8a\u53ef\u9760\u3002<\/li>\n
        3. Score Error\uff08\u5206\u6570\u8bef\u5dee\uff09\uff1a\u8868\u793a\u6d4b\u8bd5\u7ed3\u679c\u7684\u53ef\u53d8\u6027\uff0c\u8fd9\u91cc\u6ca1\u6709\u7ed9\u51fa\u5177\u4f53\u6570\u503c\uff0c\u4f46\u901a\u5e38\u5728\u8f93\u51fa\u4e2d\u4f1a\u663e\u793a\u3002<\/li>\n<\/ol>\n
          \u901a\u8fc7\u7ed3\u679c\u5f97\u5230\u4e00\u4e0b\u7ed3\u8bba\uff1a<\/strong><\/p>\n
            \n
          • \u5982\u679c\u6d4b\u8bd5\u7ed3\u679c\u7684\u8bef\u5dee\u5f88\u5c0f\uff08\u4f8b\u5982\u00b10.01%\uff09\uff0c\u5219\u8868\u793a\u6d4b\u8bd5\u7ed3\u679c\u6bd4\u8f83\u7a33\u5b9a\u548c\u53ef\u9760\u3002<\/li>\n
          • \u5982\u679c\u6d4b\u8bd5\u7ed3\u679c\u663e\u793a\u9ad8\u8bef\u5dee\uff0c\u53ef\u80fd\u9700\u8981\u589e\u52a0\u8fed\u4ee3\u6b21\u6570\u6216\u9884\u70ed\u6b21\u6570\u6765\u964d\u4f4e\u8bef\u5dee\u3002<\/li>\n
          • \u901a\u8fc7\u6bd4\u8f83\u4e0d\u540c\u6d4b\u8bd5\u65b9\u6cd5\u7684\u7ed3\u679c\uff0c\u53ef\u4ee5\u4e86\u89e3\u4e0d\u540c\u5b9e\u73b0\u7684\u6027\u80fd\u5dee\u5f02\u3002<\/li>\n<\/ul>\n
            \u5206\u6790JMH\u6d4b\u8bd5\u7ed3\u679c\u65f6\uff0c\u5e94\u8be5\u7efc\u5408\u8003\u8651\u6240\u6709\u8f93\u51fa\u7684\u6570\u636e\uff0c\u5305\u62ec\u8bef\u5dee\u3001\u767e\u5206\u4f4d\u6570\u548c\u7f6e\u4fe1\u533a\u95f4\uff0c\u4ee5\u5f97\u51fa\u51c6\u786e\u7684\u7ed3\u8bba\u3002<\/p>\n
            \u516b\u3001\u6848\u4f8b\u7814\u7a76<\/h2>\n
            \u5b9e\u9645\u6848\u4f8b\u5206\u6790\uff1a\u4f7f\u7528JMH\u6d4b\u8bd5\u5b57\u7b26\u4e32\u62fc\u63a5\u6027\u80fd<\/h5>\n
            \u5728Java\u4e2d\uff0c\u5b57\u7b26\u4e32\u62fc\u63a5\u662f\u4e00\u4e2a\u5e38\u89c1\u7684\u64cd\u4f5c\uff0c\u6709\u591a\u79cd\u65b9\u5f0f\u53ef\u4ee5\u5b9e\u73b0\uff0c\u6bd4\u5982\u4f7f\u7528String\u5bf9\u8c61\u7684+\u64cd\u4f5c\u7b26\u3001StringBuilder\u6216StringBuffer\u3002\u4e0d\u540c\u7684\u65b9\u6cd5\u5728\u6027\u80fd\u4e0a\u53ef\u80fd\u5b58\u5728\u5dee\u5f02\uff0c\u7279\u522b\u662f\u5728\u5faa\u73af\u6216\u5927\u91cf\u62fc\u63a5\u64cd\u4f5c\u65f6\u3002\u4f7f\u7528JMH\u53ef\u4ee5\u5bf9\u8fd9\u4e9b\u4e0d\u540c\u7684\u5b57\u7b26\u4e32\u62fc\u63a5\u65b9\u6cd5\u8fdb\u884c\u6027\u80fd\u6d4b\u8bd5\u3002<\/p>\n
            \u4ee5\u4e0b\u662f\u4e00\u4e2a\u4f7f\u7528JMH\u6d4b\u8bd5\u4e0d\u540c\u5b57\u7b26\u4e32\u62fc\u63a5\u65b9\u6cd5\u6027\u80fd\u7684\u793a\u4f8b\uff1a<\/p>\n
            import org.openjdk.jmh.annotations.Benchmark;\nimport org.openjdk.jmh.annotations.BenchmarkMode;\nimport org.openjdk.jmh.annotations.Mode;\nimport org.openjdk.jmh.annotations.OutputTimeUnit;\nimport org.openjdk.jmh.annotations.Warmup;\nimport org.openjdk.jmh.annotations.Measurement;\nimport org.openjdk.jmh.annotations.Fork;\nimport org.openjdk.jmh.annotations.State;\nimport org.openjdk.jmh.runner.Runner;\nimport org.openjdk.jmh.runner.RunnerException;\nimport org.openjdk.jmh.runner.options.Options;\nimport org.openjdk.jmh.runner.options.OptionsBuilder;\n\nimport java.util.concurrent.TimeUnit;\n\n@State(Scope.Thread)\n@BenchmarkMode(Mode.Throughput)\n@OutputTimeUnit(TimeUnit.SECONDS)\n@Warmup(iterations = 5)\n@Measurement(iterations = 5)\n@Fork(1)\npublic class StringConcatenationBenchmark {\n\n    @Benchmark\n    public String concatUsingPlus() {\n        String string = "";\n        for (int i = 0; i < 100; i++) {\n            string += "String";\n        }\n        return string;\n    }\n\n    @Benchmark\n    public String concatUsingStringBuilder() {\n        StringBuilder sb = new StringBuilder();\n        for (int i = 0; i < 100; i++) {\n            sb.append("String ").append(i);\n        }\n        return sb.toString();\n    }\n\n    @Benchmark\n    public String concatUsingStringBuffer() {\n        StringBuffer sb = new StringBuffer();\n        for (int i = 0; i < 100; i++) {\n            sb.append("String ").append(i);\n        }\n        return sb.toString();\n    }\n\n    public static void main(String[] args) throws RunnerException {\n        Options opt = new OptionsBuilder()\n            .include(StringConcatenationBenchmark.class.getSimpleName())\n            .build();\n        new Runner(opt).run();\n    }\n}<\/code><\/pre>\n
            \u5728\u8fd9\u4e2a\u4f8b\u5b50\u4e2d\uff0c\u6211\u4eec\u5b9a\u4e49\u4e86\u4e09\u4e2a\u57fa\u51c6\u6d4b\u8bd5\u65b9\u6cd5\uff0c\u5206\u522b\u6d4b\u8bd5\u4f7f\u7528+\u64cd\u4f5c\u7b26\u3001StringBuilder\u548cStringBuffer\u8fdb\u884c\u5b57\u7b26\u4e32\u62fc\u63a5\u7684\u6027\u80fd\u3002\u6bcf\u4e2a\u65b9\u6cd5\u90fd\u4f1a\u5728\u5faa\u73af\u4e2d\u6267\u884c100\u6b21\u5b57\u7b26\u4e32\u62fc\u63a5\u64cd\u4f5c\u3002<\/p>\n
            \u8fd0\u884c\u8fd9\u4e2a\u57fa\u51c6\u6d4b\u8bd5\u540e\uff0cJMH\u4f1a\u8f93\u51fa\u6bcf\u4e2a\u65b9\u6cd5\u7684\u541e\u5410\u91cf\uff0c\u5373\u6bcf\u79d2\u53ef\u4ee5\u5b8c\u6210\u7684\u5b57\u7b26\u4e32\u62fc\u63a5\u64cd\u4f5c\u6570\u91cf\u3002\u6839\u636e\u6d4b\u8bd5\u7ed3\u679c\uff0c\u6211\u4eec\u53ef\u4ee5\u5f97\u51fa\u54ea\u79cd\u5b57\u7b26\u4e32\u62fc\u63a5\u65b9\u6cd5\u5728\u7279\u5b9a\u60c5\u51b5\u4e0b\u6027\u80fd\u66f4\u4f18\u3002<\/p>\n
            \u5206\u6790\u6d4b\u8bd5\u7ed3\u679c<\/h5>\n
            \u5047\u8bbeJMH\u8f93\u51fa\u7684\u6d4b\u8bd5\u7ed3\u679c\u5982\u4e0b\uff1a<\/p>\n
            Benchmark                                               Mode  Cnt       Score        Error  Units\nStringConcatenationBenchmark.concatUsingPlus           thrpt    5  127801.402 \u00b1   7365.452  ops\/s\nStringConcatenationBenchmark.concatUsingStringBuffer   thrpt    5  385107.338 \u00b1  66488.847  ops\/s\nStringConcatenationBenchmark.concatUsingStringBuilder  thrpt    5  411992.746 \u00b1 155229.314  ops\/s<\/code><\/pre>\n
            \u7ed3\u8bba<\/h5>\n