{"id":10021041,"date":"2025-10-19T21:36:38","date_gmt":"2025-10-19T13:36:38","guid":{"rendered":"https:\/\/itmax.cn\/?p=10021041"},"modified":"2025-10-19T21:36:38","modified_gmt":"2025-10-19T13:36:38","slug":"%e5%8f%98%e9%87%8f%e5%90%8d%e8%b6%8a%e6%80%aa%ef%bc%8cjvm-%e8%b6%8a%e5%bf%ab%ef%bc%9f","status":"publish","type":"post","link":"https:\/\/itmax.cn\/?p=10021041","title":{"rendered":"\u53d8\u91cf\u540d\u8d8a\u602a\uff0cJVM \u8d8a\u5feb\uff1f"},"content":{"rendered":"<p>\u5728\u8f6f\u4ef6\u5de5\u7a0b\u7684\u5171\u8bc6\u91cc\uff0c\u53d8\u91cf\u547d\u540d\u8d8a\u6e05\u6670\u8d8a\u597d\u2014\u2014\u610f\u56fe\u660e\u786e\u3001\u8bed\u4e49\u5b8c\u6574\u3001\u89c1\u540d\u77e5\u610f\uff0c\u8fd9\u80fd\u964d\u4f4e\u6c9f\u901a\u6210\u672c\u3001\u51cf\u5c11\u8bef\u89e3\u3001\u63d0\u5347\u53ef\u7ef4\u62a4\u6027\u3002\u51e0\u4e4e\u6240\u6709\u98ce\u683c\u6307\u5357\u90fd\u628a\u201c\u6709\u610f\u4e49\u7684\u547d\u540d\u201d\u89c6\u4e3a\u7b2c\u4e00\u539f\u5219\u3002<\/p>\n<p>\u4f46\u4eca\u5929\u8bfb\u5230\u7684\u4e00\u7bc7\u6587\u7ae0<a href=\"https:\/\/link.segmentfault.com\/?enc=74yYaLqN0imB1hzuDVSzdQ%3D%3D.MWDe3O04y4dFzqgBkkJjtetQfeuXLbspicgdfiuxzS11l5j84ta2whzbpFoMeWLfFrtdEYsrJLWYciBWX8%2F7VfQ7WjWSBKC0mvjKC6W46zAQdX%2F%2BqeZ3K4UHAi62poEqotbyMDa4JHwoX9aNHMaVpA%3D%3D\" rel=\"nofollow noopener noreferrer\" target=\"_blank\">\u300aJava Performs Better When You Misspell Variable Names\u300b<\/a>\uff0c\u628a\u8fd9\u6761\u94c1\u5f8b\u91cc\u7684\u201c\u6027\u80fd\u90e8\u5206\u201d\u6380\u4e86\u684c\uff1a\u5728 Java \u7684\u67d0\u4e9b\u6808\u4e2d\uff0c\u523b\u610f\u7f29\u77ed\u3001\u751a\u81f3\u201c\u9519\u62fc\u201d\u7684\u53d8\u91cf\u540d\uff0c\u53ef\u80fd\u771f\u7684\u8ba9\u670d\u52a1\u66f4\u5feb\u3002\u4e0d\u662f\u4e1a\u52a1\u903b\u8f91\u7684\u53d8\u5316\uff0c\u800c\u662f\u66f4\u77ed\u3001\u66f4\u201c\u968f\u673a\u201d\u7684\u540d\u5b57\u5728\u5b57\u7b26\u4e32\u5e38\u91cf\u6c60\u3001\u54c8\u5e0c\u548c\u53cd\u5c04\u8def\u5f84\u4e0a\u66f4\u7701\u3002\u5728\u4f5c\u8005\u7684\u538b\u6d4b\u91cc\uff0c\u541e\u5410\u63d0\u5347\u6700\u9ad8\u63a5\u8fd1 49%\u3002\u8fd9\u542c\u8d77\u6765\u53cd\u5e38\u8bc6\uff0c\u4f46\u4ed6\u7528\u5fae\u57fa\u51c6\u3001\u538b\u6d4b\u4e0e\u5206\u6790\u5668\u628a\u5b83\u53d8\u6210\u4e86\u4e00\u4e2a\u4e25\u8083\u547d\u9898\u3002<\/p>\n<h2>\u8fd9\u4e8b\u662f\u600e\u4e48\u88ab\u53d1\u73b0\u7684<\/h2>\n<p>\u6545\u4e8b\u5f00\u59cb\u4e8e\u4e00\u6b21\u201c\u4e8b\u6545\u201d\u3002\u4f5c\u8005\u91cd\u6784\u65f6\u4e0d\u5c0f\u5fc3\u628a <code>customerEmail<\/code>\u3001<code>orderHistory<\/code>\u3001<code>totalAmount<\/code> \u4e4b\u7c7b\u7684\u53d8\u91cf\u5199\u6210\u4e86 <code>custEmil<\/code>\u3001<code>ordrHstry<\/code>\u3001<code>totlAmnt<\/code>\u3002<\/p>\n<pre><code class=\"java\">\/\/ \u672c\u6765\u8981\u5199\uff1a\nprivate String customerEmail;\nprivate List&lt;Order&gt; orderHistory;\nprivate BigDecimal totalAmount;\n\n\/\/ \u5b9e\u9645\u4e0a\u7ebf\u7684\u662f\nprivate String custEmil;\nprivate List&lt;Order&gt; ordrHstry;\nprivate BigDecimal totlAmnt;<\/code><\/pre>\n<p>\u7ed3\u679c\u7b2c\u4e8c\u5929\u76d1\u63a7\u663e\u793a\uff1a\u5e73\u5747\u5ef6\u8fdf\u4ece 127ms \u76f4\u63a5\u964d\u5230 80ms\u3002\u4f5c\u8005\u8d77\u521d\u6000\u7591\u662f\u7f13\u5b58\u5076\u7136\u547d\u4e2d\u3001\u7f51\u7edc\u6ce2\u52a8\u6216\u8005\u6d4b\u91cf\u8bef\u5dee\uff0c\u56de\u6eda\u5230\u201c\u6574\u6d01\u547d\u540d\u201d\uff0c\u5ef6\u8fdf\u53c8\u56de\u5230 127ms\u3002\u8fd9\u4e00\u6765\u4e00\u56de\uff0c\u903c\u7740\u4ed6\u628a\u8fd9\u4ef6\u4e8b\u5f53\u771f\u3002<\/p>\n<p>\u4e8e\u662f\u4ed6\u7cfb\u7edf\u5316\u5730\u505a\u4e86\u9a8c\u8bc1\u3002\u7528 JMH \u5199\u5bf9\u7167\u5b9e\u9a8c\uff0c\u4e24\u4e2a\u7248\u672c\u4ee3\u7801\u903b\u8f91\u5b8c\u5168\u4e00\u81f4\uff0c\u552f\u4e00\u53d8\u91cf\u662f\u201c\u547d\u540d\u957f\u5ea6\u4e0e\u5f62\u6001\u201d\uff1a\u4e00\u4e2a\u7248\u672c\u7528\u89c4\u8303\u3001\u5b8c\u6574\u3001\u53ef\u8bfb\u7684\u540d\u5b57\uff0c\u53e6\u4e00\u4e2a\u7248\u672c\u628a\u5143\u97f3\u5220\u6389\u3001\u524d\u7f00\u7f29\u77ed\u3001\u5076\u5c14\u628a\u540d\u5b57\u53d8\u5f97\u66f4\u968f\u673a\u3002\u7136\u540e\u662f\u66f4\u63a5\u8fd1\u751f\u4ea7\u7684\u9a8c\u8bc1\uff1a\u628a\u540c\u6837\u7684\u7b56\u7565\u5e94\u7528\u5230\u4e00\u4e2a Spring Boot \u670d\u52a1\uff0c\u5728 1000 \u5e76\u53d1\u300160 \u79d2\u7684 JMeter \u538b\u6d4b\u4e0b\u5bf9\u6bd4\u4e24\u7248\u541e\u5410\u548c\u5ef6\u8fdf\u3002\u6700\u540e\u7528\u5206\u6790\u5668\uff08\u5982 YourKit\uff09\u53bb\u770b\u5b57\u7b26\u4e32\u76f8\u5173\u70ed\u70b9\u5230\u5e95\u662f\u4e0d\u662f\u5728\u4e0b\u964d\u3002<\/p>\n<h2>\u6570\u636e\u4e0e\u5206\u6790\uff1a\u4e0d\u662f\u201c\u7384\u5b66\u201d\uff0c\u800c\u662f\u6210\u672c\u6808\u91cc\u7684\u4e00\u6bb5\u88ab\u5ffd\u89c6\u7684\u8def<\/h2>\n<p>\u5728\u5fae\u57fa\u51c6\u91cc\uff0c\u4f5c\u8005\u62a5\u544a\u4ec5\u5220\u9664\u5143\u97f3\u5c31\u80fd\u5e26\u6765\u7ea6 26% \u7684\u63d0\u5347\uff1b\u800c\u5f53\u540d\u5b57\u66f4\u77ed\u3001\u66f4\u201c\u4e71\u201d\uff08\u6bd4\u5982\u4e09\u56db\u4e2a\u5b57\u7b26\u7684\u7f29\u5199\u6216\u65e0\u610f\u4e49\u7ec4\u5408\uff09\uff0c\u63d0\u5347\u66f4\u660e\u663e\u3002\u5728\u538b\u6d4b\u91cc\uff0c\u5e73\u5747\u54cd\u5e94\u4ece 143ms \u964d\u5230 91ms\uff0c\u541e\u5410\u4ece 6847 req\/s \u5230 10234 req\/s\uff0c\u9519\u8bef\u7387\u4e0d\u53d8\u3002\u5206\u6790\u5668\u5219\u663e\u793a <code>String.hashCode()<\/code> \u7684\u603b\u8017\u65f6\u663e\u8457\u4e0b\u964d\uff08\u8c03\u7528\u6b21\u6570\u4e00\u6837\uff09\uff0c\u4f46\u77ed\u540d\u5b57\u7684\u603b\u8017\u65f6\u5c11\u4e86\u8fd1\u4e00\u79d2\uff08\u6309 60 \u79d2\u7a97\u53e3\uff09\u3002<\/p>\n<p>\u4e3a\u4ec0\u4e48\u53ef\u80fd\u6210\u7acb\uff1f\u56e0\u4e3a JVM \u7684\u5b57\u7b26\u4e32\u5e38\u91cf\u6c60\uff08String Table\uff09\u662f\u54c8\u5e0c\u8868\u7ed3\u6784\uff0c\u53cd\u5c04\u3001\u8c03\u8bd5\u3001\u5806\u6808\u3001\u6846\u67b6\u5185\u7701\u90fd\u4f1a\u4e0d\u65ad\u5730\u89e6\u53d1\u5bf9\u8fd9\u4e9b\u5b57\u7b26\u4e32\u7684\u67e5\u627e\u548c\u54c8\u5e0c\u3002\u957f\u4e14\u524d\u7f00\u76f8\u4f3c\u7684\u540d\u5b57\u66f4\u5bb9\u6613\u53d1\u751f\u54c8\u5e0c\u78b0\u649e\uff0c\u67e5\u627e\u94fe\u66f4\u957f\uff0c\u7f13\u5b58\u5c40\u90e8\u6027\u66f4\u5dee\uff0cGC \u5728\u6807\u8bb0-\u6e05\u9664\u9636\u6bb5\u626b\u63cf\u4fdd\u7559\u8fd9\u6279\u5b57\u7b26\u4e32\u7684\u6210\u672c\u4e5f\u66f4\u9ad8\u3002JIT \u80fd\u4f18\u5316\u8ba1\u7b97\uff0c\u4f46\u5b83\u4f18\u5316\u4e0d\u6389\u5b57\u7b26\u4e32\u8868\u3001\u53cd\u5c04\u548c GC \u7684\u56fa\u5b9a\u6210\u672c\u3002\u77ed\u4e14\u66f4\u201c\u968f\u673a\u201d\u7684\u540d\u5b57\uff0c\u5f80\u5f80\u6709\u66f4\u597d\u7684\u54c8\u5e0c\u5206\u5e03\uff0c\u66f4\u4f4e\u7684\u78b0\u649e\u7387\uff0c\u66f4\u53cb\u597d\u7684\u7f13\u5b58\u547d\u4e2d\u3002<\/p>\n<p>\u8fd9\u4e5f\u89e3\u91ca\u4e86\u4e00\u4e2a\u8ba9\u4eba\u4e0d\u9002\u7684\u73b0\u5b9e\uff1a<strong>\u5728\u53cd\u5c04\u5bc6\u96c6\u7684\u6808\u4e2d\uff08Spring\u3001Hibernate\u3001Jackson \u7b49\uff09\uff0c\u540d\u5b57\u5e76\u975e\u201c\u8fd0\u884c\u65f6\u514d\u8d39\u201d\u3002\u5728\u67d0\u4e9b\u8def\u5f84\u4e0a\uff0c\u540d\u5b57\u7684\u957f\u5ea6\u4e0e\u5206\u5e03\u4f1a\u6210\u4e3a\u53ef\u6d4b\u7684\u6210\u672c<\/strong>\u3002<\/p>\n<h2>\u6211\u4eec\u8be5\u600e\u4e48\u529e\uff1a\u547d\u540d\uff0c\u4e0d\u518d\u53ea\u662f\u98ce\u683c\u95ee\u9898<\/h2>\n<p>\u77e5\u9053\u8fd9\u4e2a\u7ed3\u8bba\u4e4b\u540e\uff0c\u6211\u4eec\u5e94\u8be5\u8c03\u6574\u547d\u540d\u7b56\u7565\u5417\uff1f\u6211\u89c9\u5f97\u5e94\u8be5\uff0c\u4f46\u53ea\u5728\u8be5\u7528\u7684\u5730\u65b9\u7528\uff0c\u5e76\u4e14\u7ed9\u5b83\u52a0\u4e0a\u6e05\u6670\u7684\u8fb9\u754c\u3002<\/p>\n<ul>\n<li>\u5148\u5256\u6790\u518d\u52a8\u5200\uff1a\u7528\u5206\u6790\u5668\u5b9a\u4f4d\u5b57\u7b26\u4e32\u76f8\u5173\u70ed\u70b9\uff08\u4f8b\u5982\u53cd\u5c04\u5165\u53e3\u3001\u5e8f\u5217\u5316\/\u53cd\u5e8f\u5217\u5316\u3001\u6846\u67b6\u5185\u7701\u3001<code>StringTable<\/code>\uff09\uff0c\u786e\u8ba4\u5b83\u4eec\u786e\u5b9e\u5728\u5403\u6389\u4f60\u7684\u65f6\u95f4\u3002<\/li>\n<li>\u53ea\u5728\u70ed\u70b9\u5904\u8c03\u547d\u540d\uff1a\u628a\u7b56\u7565\u9650\u5b9a\u5728\u9ad8\u9891\u53cd\u5c04\u548c\u5e8f\u5217\u5316\u7684\u7c7b\u578b\u3001\u5b57\u6bb5\u3001\u65b9\u6cd5\u4e0a\uff1b\u9886\u57df\u6a21\u578b\u548c\u4e1a\u52a1\u89c4\u5219\u4fdd\u6301\u53ef\u8bfb\u6027\uff0c\u522b\u628a\u56e2\u961f\u534f\u4f5c\u53d8\u6210\u89e3\u8c1c\u6e38\u620f\u3002<\/li>\n<li>\n<p>\u4fdd\u5b88\u4f18\u5148\u3001\u6fc0\u8fdb\u8bd5\u70b9\uff1a<\/p>\n<ul>\n<li>\u4fdd\u5b88\u6863\uff1a\u5220\u9664\u660e\u663e\u5143\u97f3\u3001\u7f29\u77ed\u524d\u7f00\uff08<code>customerEmailAddress \u2192 cstmrEmlAdr<\/code>\uff09\uff0c\u76ee\u6807\u589e\u76ca 8\u201312%\u3002<\/li>\n<li>\u6fc0\u8fdb\u6863\uff1a\u66f4\u79ef\u6781\u5730\u7f29\u77ed\u5e76\u5f31\u5316\u76f8\u4f3c\u524d\u7f00\uff08<code>orderHistoryList \u2192 ordrHstryLst<\/code>\uff09\uff0c\u76ee\u6807\u589e\u76ca 18\u201324%\u3002<\/li>\n<li>\u6781\u7aef\u6863\uff1a\u4e09\u56db\u5b57\u7b26\u7684\u5f3a\u7f29\u5199\uff08<code>totalAmountPaid \u2192 tAP<\/code>\uff09\uff0c\u589e\u76ca\u53ef\u80fd\u66f4\u9ad8\uff0c\u4f46\u4e0d\u5efa\u8bae\u7528\u4e8e\u751f\u4ea7\u7684\u6838\u5fc3\u4e1a\u52a1\u57df\u3002<\/li>\n<\/ul>\n<\/li>\n<li>\u642d\u914d\u66ff\u4ee3\u65b9\u6848\uff1a\u80fd\u7528\u4ee3\u7801\u751f\u6210\/\u6ce8\u89e3\u5904\u7406\u5668\u66ff\u4ee3\u53cd\u5c04\u5c31\u66ff\u4ee3\uff1b\u5e8f\u5217\u5316\u5c42\u9009\u62e9\u66f4\u9ad8\u6548\u7684\u5b9e\u73b0\uff1b\u5fc5\u8981\u65f6\u5fae\u8c03 <code>-XX:StringTableSize<\/code> \u5e76\u505a\u5bf9\u7167\u9a8c\u8bc1\u3002<\/li>\n<li>\u5de5\u7a0b\u5316\u9a8c\u8bc1\uff1a\u8bbe\u7f6e\u53ef\u9760\u7684\u57fa\u51c6\uff08JIT \u9884\u70ed\u3001\u56fa\u5b9a\u53c2\u6570\u3001\u5c4f\u853d I\/O \u5e72\u6270\uff09\uff0c\u770b p95\/p99 \u4e0e\u541e\u5410\u7684\u53d8\u5316\uff0c\u518d\u51b3\u5b9a\u662f\u5426\u63a8\u5e7f\u3002<\/li>\n<\/ul>\n<h2>\u601d\u8003\uff1a\u6570\u636e\u4e0e\u6559\u6761\uff0c\u8c01\u8be5\u8ba9\u6b65\uff1f<\/h2>\n<ul>\n<li>\u5982\u679c\u547d\u540d\u5728\u67d0\u4e9b\u6808\u91cc\u662f\u6210\u672c\uff0c\u6211\u4eec\u662f\u5426\u5e94\u8be5\u5efa\u7acb\u4e00\u4efd\u201c\u70ed\u70b9\u547d\u540d\u7b56\u7565\u201d\uff0c\u50cf\u6027\u80fd\u9884\u7b97\u4e00\u6837\uff0c\u5141\u8bb8\u5728\u5c11\u6570\u5173\u952e\u8def\u5f84\u727a\u7272\u4e00\u70b9\u53ef\u8bfb\u6027\u6765\u6362\u53d6\u541e\u5410\uff1f<\/li>\n<li>\u4e0d\u540c JVM \u7248\u672c\u3001\u4e0d\u540c GC \u7b56\u7565\u3001\u4e0d\u540c\u6846\u67b6\u7ec4\u5408\u4e0b\uff0c\u8fd9\u4e2a\u6548\u679c\u662f\u5426\u4e00\u81f4\uff1f\u662f\u5426\u53ef\u4ee5\u7528\u5de5\u5177\u94fe\uff08\u91cd\u547d\u540d\u5668\u3001lint 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