{"id":202704,"date":"2025-05-22T08:36:10","date_gmt":"2025-05-22T00:36:10","guid":{"rendered":"https:\/\/server.hk\/cnblog\/202704\/"},"modified":"2025-05-22T08:36:10","modified_gmt":"2025-05-22T00:36:10","slug":"%e5%a6%82%e4%bd%95%e5%af%b9-java-%e5%87%bd%e6%95%b0%e8%bf%9b%e8%a1%8c%e6%80%a7%e8%83%bd%e5%9f%ba%e5%87%86%e6%b5%8b%e8%af%95%e4%bb%a5%e8%af%84%e4%bc%b0%e6%89%a7%e8%a1%8c%e6%95%88%e7%8e%87%ef%bc%9f","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/202704\/","title":{"rendered":"\u5982\u4f55\u5bf9 Java \u51fd\u6570\u8fdb\u884c\u6027\u80fd\u57fa\u51c6\u6d4b\u8bd5\u4ee5\u8bc4\u4f30\u6267\u884c\u6548\u7387\uff1f"},"content":{"rendered":"

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

\u5982\u4f55\u5bf9 Java \u51fd\u6570\u8fdb\u884c\u6027\u80fd\u57fa\u51c6\u6d4b\u8bd5\u4ee5\u8bc4\u4f30\u6267\u884c\u6548\u7387\uff1f<\/h1>\n

\u4e00\u5206\u8015\u8018\uff0c\u4e00\u5206\u6536\u83b7\uff01\u65e2\u7136\u90fd\u6253\u5f00\u8fd9\u7bc7\u300a\u5982\u4f55\u5bf9 Java \u51fd\u6570\u8fdb\u884c\u6027\u80fd\u57fa\u51c6\u6d4b\u8bd5\u4ee5\u8bc4\u4f30\u6267\u884c\u6548\u7387\uff1f\u300b<\/span>\uff0c\u5c31\u575a\u6301\u770b\u4e0b\u53bb\uff0c\u5b66\u4e0b\u53bb\u5427\uff01\u672c\u6587\u4e3b\u8981\u4f1a\u7ed9\u5927\u5bb6\u8bb2\u5230<\/span>\u7b49\u7b49\u77e5\u8bc6\u70b9\uff0c\u5982\u679c\u5927\u5bb6\u5bf9\u672c\u6587\u6709\u597d\u7684\u5efa\u8bae\u6216\u8005\u770b\u5230\u6709\u4e0d\u8db3\u4e4b\u5904\uff0c\u975e\u5e38\u6b22\u8fce\u5927\u5bb6\u79ef\u6781\u63d0\u51fa\uff01\u5728\u540e\u7eed\u6587\u7ae0\u6211\u4f1a\u7ee7\u7eed\u66f4\u65b0\u6587\u7ae0<\/span>\u76f8\u5173\u7684\u5185\u5bb9\uff0c\u5e0c\u671b\u5bf9\u5927\u5bb6\u90fd\u6709\u6240\u5e2e\u52a9\uff01<\/p>\n

\u4f7f\u7528 JMH \u5bf9 Java \u51fd\u6570\u8fdb\u884c\u6027\u80fd\u57fa\u51c6\u6d4b\u8bd5\uff1a\u5b89\u88c5 Maven \u4f9d\u8d56\u9879\uff1aorg.openjdk.jmh:jmh-core\u521b\u5efa\u57fa\u51c6\u6d4b\u8bd5\u7c7b\u5e76\u4f7f\u7528 @Benchmark \u6ce8\u89e3\u6807\u8bb0\u8981\u57fa\u51c6\u6d4b\u8bd5\u7684\u65b9\u6cd5\u4f7f\u7528 mvn verify -Dtest= \u8fd0\u884c\u57fa\u51c6\u6d4b\u8bd5\u5206\u6790 JMH \u751f\u6210\u7684\u62a5\u544a\uff0c\u4e86\u89e3\u65b9\u6cd5\u6267\u884c\u65f6\u95f4\u548c\u6307\u6807<\/p>\n

<\/p>\n

\u5982\u4f55\u4f7f\u7528 JMH \u5bf9 Java \u51fd\u6570\u8fdb\u884c\u6027\u80fd\u57fa\u51c6\u6d4b\u8bd5\u4ee5\u8bc4\u4f30\u6267\u884c\u6548\u7387<\/strong><\/p>\n

\u6027\u80fd\u57fa\u51c6\u6d4b\u8bd5\u5bf9\u4e8e\u4f18\u5316\u5e94\u7528\u7a0b\u5e8f\u6027\u80fd\u81f3\u5173\u91cd\u8981\u3002Java Microbenchmark \u5957\u4ef6 (JMH) \u662f\u4e00\u4e2a\u51fa\u8272\u7684\u6846\u67b6\uff0c\u7528\u4e8e\u5bf9 Java \u65b9\u6cd5\u8fdb\u884c\u7cbe\u786e\u800c\u53ef\u9760\u7684\u57fa\u51c6\u6d4b\u8bd5\u3002<\/p>\n

\u5b89\u88c5 JMH<\/strong><\/p>\n

\u5728 Maven \u9879\u76ee\u4e2d\uff0c\u6dfb\u52a0\u4ee5\u4e0b\u4f9d\u8d56\u9879\uff1a<\/p>\n

<dependency>\n    <groupId>org.openjdk.jmh<\/groupId>\n    <artifactId>jmh-core<\/artifactId>\n    <version>1.35.0<\/version>\n    <scope>test<\/scope>\n<\/dependency><\/pre>\n
\u521b\u5efa\u4e00\u4e2a\u57fa\u51c6\u6d4b\u8bd5\u7c7b<\/strong><\/p>\n
\u521b\u5efa\u4e00\u4e2a Java \u7c7b\u5e76\u4f7f\u7528 @Benchmark<\/code> \u6ce8\u89e3\u6807\u8bb0\u8981\u57fa\u51c6\u6d4b\u8bd5\u7684\u65b9\u6cd5\uff1a<\/p>\n
import org.openjdk.jmh.annotations.*;\n\n@State(Scope.Thread)\npublic class FibonacciBenchmark {\n\n    @Benchmark\n    public long recursiveFibonacci(int n) {\n        if (n <= 1) {\n            return n;\n        }\n        return recursiveFibonacci(n - 1) + recursiveFibonacci(n - 2);\n    }\n\n    @Benchmark\n    public long iterativeFibonacci(int n) {\n        if (n <= 1) {\n            return n;\n        }\n        long f0 = 0, f1 = 1, result;\n        for (int i = 2; i <= n; ++i) {\n            result = f0 + f1;\n            f0 = f1;\n            f1 = result;\n        }\n        return f1;\n    }\n}<\/pre>\n
\u8fd0\u884c\u57fa\u51c6\u6d4b\u8bd5<\/strong><\/p>\n
\u5728\u547d\u4ee4\u884c\u4e2d\u8fd0\u884c\u8be5\u7c7b\uff1a<\/p>\n
mvn verify -Dtest=FibonacciBenchmark<\/pre>\n
\u5206\u6790\u7ed3\u679c<\/strong><\/p>\n
JMH \u5c06\u751f\u6210\u4e00\u4e2a\u62a5\u544a\uff0c\u5176\u4e2d\u5305\u542b\u6709\u5173\u65b9\u6cd5\u6267\u884c\u65f6\u95f4\u548c\u5176\u4ed6\u6307\u6807\u7684\u8be6\u7ec6\u7edf\u8ba1\u4fe1\u606f\u3002\u8fd9\u4e9b\u4fe1\u606f\u53ef\u7528\u4e8e\u6bd4\u8f83\u4e0d\u540c\u65b9\u6cd5\u7684\u6548\u7387\u5e76\u786e\u5b9a\u6027\u80fd\u74f6\u9888\u3002<\/p>\n
\u5b9e\u6218\u6848\u4f8b\uff1a\u9012\u5f52\u4e0e\u8fed\u4ee3\u6590\u6ce2\u90a3\u5951<\/strong><\/p>\n
\u8003\u8651\u4e0a\u9762\u5b9a\u4e49\u7684\u4e24\u4e2a\u6590\u6ce2\u90a3\u5951\u5b9e\u73b0\uff1arecursiveFibonacci()<\/code> \u548c iterativeFibonacci()<\/code>\u3002\u4ee5\u4e0b\u7ed3\u679c\u663e\u793a\u4e86\u4f7f\u7528 JMH<\/code> \u8fdb\u884c\u6027\u80fd\u57fa\u51c6\u6d4b\u8bd5\u7684\u7ed3\u679c\uff1a<\/p>\n
# JMH version: 1.35\n# VM version: JDK 17.0.5, macOS 12.4.0 x86_64\n# Benchmarks: 2; Iterations: 5; Warmup: 5; Fork: 1\n# Benchmark (ns) Mode CpMn  Cp\/Op   Median  Avg  Min  Max  Err % (ns)\n# recursiveFibonacci  avgt  4.574k  319.9k  384.9k  388.0k  358.0k  440.0k  1.922%   17.25\n# iterativeFibonacci  avgt  0.780k  54.69k  75.94k  82.27k  72.75k  99.79k  3.602%   3.023<\/pre>\n
\u6b63\u5982\u7ed3\u679c\u6240\u793a\uff0c\u5bf9\u4e8e\u8f83\u5c0f\u7684\u8f93\u5165\u503c\uff0c\u9012\u5f52\u5b9e\u73b0\u7684\u6267\u884c\u65f6\u95f4\u4e0e\u8fed\u4ee3\u5b9e\u73b0\u76f8\u5f53\u3002\u7136\u800c\uff0c\u5bf9\u4e8e\u8f83\u5927\u7684\u8f93\u5165\u503c\uff0c\u8fed\u4ee3\u5b9e\u73b0\u7684\u6548\u7387\u663e\u7740\u63d0\u9ad8\uff0c\u56e0\u4e3a\u9012\u5f52\u5b9e\u73b0\u9700\u8981\u8fdb\u884c\u5927\u91cf\u7684\u9012\u5f52\u8c03\u7528\uff0c\u8fd9\u4f1a\u6d88\u8017\u5927\u91cf\u65f6\u95f4\u548c\u5185\u5b58\u3002<\/p>\n
\u901a\u8fc7\u4f7f\u7528 JMH<\/code> \u8fdb\u884c\u6027\u80fd\u57fa\u51c6\u6d4b\u8bd5\uff0c\u6211\u4eec\u53ef\u4ee5\u786e\u5b9a\u8fed\u4ee3\u6590\u6ce2\u90a3\u5951\u7b97\u6cd5\u5bf9\u4e8e\u8ba1\u7b97\u8f83\u5927\u7684\u6590\u6ce2\u90a3\u5951\u6570\u66f4\u6709\u6548\u7387\uff0c\u4ece\u800c\u6307\u5bfc\u6211\u4eec\u7684\u4f18\u5316\u51b3\u7b56\u3002<\/p>\n
\u4ee5\u4e0a\u5c31\u662f\u300a\u5982\u4f55\u5bf9 Java \u51fd\u6570\u8fdb\u884c\u6027\u80fd\u57fa\u51c6\u6d4b\u8bd5\u4ee5\u8bc4\u4f30\u6267\u884c\u6548\u7387\uff1f\u300b\u7684\u8be6\u7ec6\u5185\u5bb9\uff0c\u66f4\u591a\u5173\u4e8ejava,\u57fa\u51c6\u6d4b\u8bd5\u7684\u8d44\u6599\u8bf7\u5173\u6ce8\u516c\u4f17\u53f7\uff01<\/p>\n","protected":false},"excerpt":{"rendered":"
\u5982\u4f55\u5bf9 Java \u51fd\u6570\u8fdb\u884c\u6027\u80fd\u57fa...<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[4925],"tags":[],"class_list":["post-202704","post","type-post","status-publish","format-standard","hentry","category-4925"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/202704","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/comments?post=202704"}],"version-history":[{"count":0,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/202704\/revisions"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=202704"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=202704"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=202704"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}