{"id":82037,"date":"2026-07-25T06:11:25","date_gmt":"2026-07-24T22:11:25","guid":{"rendered":"https:\/\/www.wsisp.com\/helps\/82037.html"},"modified":"2026-07-25T06:11:25","modified_gmt":"2026-07-24T22:11:25","slug":"%e5%88%ab%e4%b9%b1%e7%94%a8-java-8-%e7%9a%84%e5%b9%b6%e8%a1%8c%e6%b5%81%e4%ba%86%ef%bc%81%e4%b8%80%e6%96%87%e7%9c%8b%e6%87%82-forkjoinpool-%e6%98%af%e5%a6%82%e4%bd%95%e6%8a%8a%e6%9c%8d%e5%8a%a1","status":"publish","type":"post","link":"https:\/\/www.wsisp.com\/helps\/82037.html","title":{"rendered":"\u522b\u4e71\u7528 Java 8 \u7684\u5e76\u884c\u6d41\u4e86\uff01\u4e00\u6587\u770b\u61c2 ForkJoinPool \u662f\u5982\u4f55\u628a\u670d\u52a1\u5668\u641e\u6302\u7684"},"content":{"rendered":"<p><img decoding=\"async\" src=\"https:\/\/www.wsisp.com\/helps\/wp-content\/uploads\/2026\/07\/20260724221121-6a63e30998508.png\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\" \/><br \/>\n\u5728\u540e\u7aef\u5f00\u53d1\u7684\u804c\u4e1a\u751f\u6daf\u4e2d&#xff0c;\u6700\u8ba9\u4eba\u80be\u4e0a\u817a\u7d20\u98d9\u5347\u7684\u62a5\u8b66\u83ab\u8fc7\u4e8e\u4e24\u6761&#xff1a;<\/p>\n<li>CPU \u4f7f\u7528\u7387\u98d9\u5347\u81f3 100%\u3002<\/li>\n<li>java.lang.OutOfMemoryError (OOM)\u3002<\/li>\n<p>\u5f53\u8fd9\u4e24\u4e2a\u62a5\u8b66\u540c\u65f6\u51fa\u73b0\u65f6&#xff0c;\u7cfb\u7edf\u901a\u5e38\u5df2\u7ecf\u5904\u4e8e\u201c\u762b\u75ea\u201d\u72b6\u6001\u3002\u5f88\u591a\u7f3a\u4e4f\u7ecf\u9a8c\u7684\u5f00\u53d1\u8005\u4e00\u770b\u5230 OOM&#xff0c;\u7b2c\u4e00\u53cd\u5e94\u5c31\u662f\u201c\u52a0\u5185\u5b58\u201d\u6216\u8005\u201c\u91cd\u542f\u673a\u5668\u201d\u3002<br \/>\n\u4f46\u8fd9\u53ea\u662f\u996e\u9e29\u6b62\u6e34\u3002\u4eca\u5929&#xff0c;\u6211\u4eec\u5c31\u7528\u4e00\u4e2a\u6781\u5177\u9690\u853d\u6027\u7684\u771f\u5b9e\u751f\u4ea7\u6848\u4f8b\u2014\u2014\u6ee5\u7528 Java 8 parallelStream \u5bfc\u81f4 OOM&#xff0c;\u6765\u6252\u4e00\u6252\u6392\u67e5 JVM \u7ebf\u4e0a\u6545\u969c\u7684\u6807\u51c6\u59ff\u52bf\u3002<\/p>\n<hr \/>\n<h3>&#x1f6a8; \u4e00\u3001\u6848\u53d1\u73b0\u573a&#xff1a;\u96ea\u5d29\u53ea\u5728\u4e00\u77ac\u95f4<\/h3>\n<ul>\n<li>\u75c7\u72b6&#xff1a;\u67d0\u4e2a\u666e\u901a\u7684\u4e0b\u5348&#xff0c;\u76d1\u63a7\u5927\u76d8\u7a81\u7136\u98d8\u7ea2\u3002\u67d0\u6838\u5fc3\u670d\u52a1\u7684 CPU \u77ac\u95f4\u6253\u6ee1 100%&#xff0c;\u54cd\u5e94\u65f6\u95f4 (RT) \u4ece 50ms \u98d9\u5347\u5230 30000ms&#xff0c;\u7d27\u63a5\u7740\u670d\u52a1\u5668\u75af\u72c2\u629b\u51fa OutOfMemoryError: GC overhead limit exceeded\u3002<\/li>\n<li>\u4e1a\u52a1\u573a\u666f&#xff1a;\u8fd9\u662f\u4e00\u4e2a\u6279\u91cf\u5bfc\u51fa\/\u5904\u7406\u6570\u636e\u7684\u63a5\u53e3&#xff0c;\u4e3a\u4e86\u201c\u52a0\u901f\u201d\u5904\u7406&#xff0c;\u5f00\u53d1\u4eba\u5458\u6109\u5feb\u5730\u4f7f\u7528\u4e86 Java 8 \u7684\u5e76\u884c\u6d41 list.parallelStream().forEach(&#8230;)\u3002<\/li>\n<\/ul>\n<p>\u4e3a\u4ec0\u4e48\u4e00\u6bb5\u770b\u8d77\u6765\u6781\u5176\u4f18\u96c5\u7684\u201c\u8bed\u6cd5\u7cd6\u201d\u4ee3\u7801&#xff0c;\u4f1a\u628a\u670d\u52a1\u5668\u76f4\u63a5\u5e72\u8db4\u4e0b&#xff1f;<\/p>\n<hr \/>\n<h3>&#x1f575;\ufe0f\u200d\u2642\ufe0f \u4e8c\u3001\u539f\u7406\u89e3\u5256&#xff1a;\u5168\u516c\u53f8\u5171\u7528\u4e00\u4e2a\u201c\u516c\u5171\u5395\u6240\u201d<\/h3>\n<p>\u5728 Java 8 \u4e2d&#xff0c;parallelStream() \u5e95\u5c42\u4f9d\u8d56\u7684\u662f ForkJoinPool\u3002\u4f46\u8fd9\u91cc\u6709\u4e00\u4e2a\u6781\u5176\u81f4\u547d\u7684\u5751&#xff1a;\u5982\u679c\u4f60\u4e0d\u663e\u5f0f\u6307\u5b9a\u7ebf\u7a0b\u6c60&#xff0c;\u6240\u6709\u7684 parallelStream() \u90fd\u4f1a\u5171\u4eab\u540c\u4e00\u4e2a\u5168\u5c40\u9ed8\u8ba4\u7684\u7ebf\u7a0b\u6c60 \u2014\u2014 ForkJoinPool.commonPool()\u3002<\/p>\n<p>\u8fd9\u4e2a commonPool \u7684\u6838\u5fc3\u7ebf\u7a0b\u6570\u9ed8\u8ba4\u7b49\u4e8e CPU \u6838\u5fc3\u6570 &#8211; 1\u3002\u5047\u8bbe\u4f60\u7684\u670d\u52a1\u5668\u662f 8 \u6838&#xff0c;\u90a3\u4e48\u8fd9\u4e2a\u6c60\u5b50\u91cc\u53ea\u6709 7 \u4e2a\u7ebf\u7a0b\u3002<\/p>\n<h4>\u707e\u96be\u662f\u5982\u4f55\u53d1\u751f\u7684&#xff1f;<\/h4>\n<li>\u963b\u585e\u64cd\u4f5c\u5165\u6c60&#xff1a;\u5f00\u53d1\u4eba\u5458\u5728 parallelStream().forEach() \u91cc\u9762\u5199\u4e86\u67e5\u6570\u636e\u5e93\u3001\u8c03\u7b2c\u4e09\u65b9 API \u7b49\u8017\u65f6\u7684 IO \u64cd\u4f5c&#xff08;\u6bd4\u5982\u8017\u65f6 1 \u79d2&#xff09;\u3002<\/li>\n<li>\u6c60\u5b50\u88ab\u77ac\u95f4\u69a8\u5e72&#xff1a;\u5f53\u6709 7 \u4e2a\u5143\u7d20\u8fdb\u5165\u6d41\u65f6&#xff0c;commonPool \u7684 7 \u4e2a\u7ebf\u7a0b\u77ac\u95f4\u5168\u90e8\u5904\u4e8e \u963b\u585e (Blocked\/Waiting) \u72b6\u6001\u3002<\/li>\n<li>Tomcat \u7ebf\u7a0b\u5806\u79ef (OOM \u7684\u5143\u51f6)&#xff1a;<\/li>\n<ul>\n<li>\u5916\u754c\u7684\u7528\u6237\u8bf7\u6c42\u8fd8\u5728\u6e90\u6e90\u4e0d\u65ad\u5730\u6253\u5165\u7cfb\u7edf\u3002<\/li>\n<li>Tomcat \u7684\u5de5\u4f5c\u7ebf\u7a0b&#xff08;\u6bd4\u5982 200 \u4e2a&#xff09;\u63a5\u5230\u8bf7\u6c42\u540e&#xff0c;\u7eb7\u7eb7\u8c03\u7528\u8fd9\u4e2a\u5305\u542b parallelStream() \u7684\u65b9\u6cd5\u3002<\/li>\n<li>\u56e0\u4e3a\u5e95\u5c42\u7684 commonPool \u5df2\u7ecf\u6ee1\u4e86&#xff0c;\u8fd9 200 \u4e2a Tomcat \u7ebf\u7a0b\u5168\u90e8\u88ab\u8feb\u6392\u961f\u7b49\u5f85\u3002<\/li>\n<li>\u6bcf\u4e00\u4e2a\u6302\u8d77\u7684 Tomcat \u7ebf\u7a0b\u80cc\u540e&#xff0c;\u90fd\u6293\u7740\u4e00\u5927\u5806\u7684 Request\u3001Response \u5bf9\u8c61\u548c\u4e1a\u52a1\u4e0a\u4e0b\u6587\u4e0d\u653e&#xff01;<\/li>\n<\/ul>\n<li>GC \u75af\u72c2\u4f5c\u795f (CPU 100% \u7684\u5143\u51f6)&#xff1a;<\/li>\n<ul>\n<li>Tomcat \u7ebf\u7a0b\u5806\u79ef\u5bfc\u81f4\u5806\u5185\u5b58 (Heap) \u8fc5\u901f\u88ab\u586b\u6ee1\u3002<\/li>\n<li>JVM \u53d1\u73b0\u5185\u5b58\u4e0d\u591f\u4e86&#xff0c;\u8d76\u7d27\u6d3e \u5783\u573e\u56de\u6536\u5668 (GC) \u53bb\u6253\u626b\u536b\u751f\u3002<\/li>\n<li>\u4f46\u90a3\u4e9b\u5bf9\u8c61\u90fd\u5728\u88ab\u6392\u961f\u7684\u7ebf\u7a0b\u5f15\u7528\u7740&#xff0c;\u6839\u672c\u56de\u6536\u4e0d\u6389&#xff01;<\/li>\n<li>GC \u4e0d\u7518\u5fc3&#xff0c;\u5f00\u59cb\u8fdb\u5165\u201c\u75af\u72c2\u6a21\u5f0f\u201d&#xff08;Full GC \u9891\u7e41\u89e6\u53d1&#xff09;\u3002\u6240\u6709\u7684 CPU \u7b97\u529b\u90fd\u88ab\u7528\u6765\u505a\u65e0\u7528\u529f\u7684\u5783\u573e\u56de\u6536&#xff0c;\u5bfc\u81f4 CPU \u77ac\u95f4\u98d9\u5347\u5230 100%\u3002<\/li>\n<\/ul>\n<hr \/>\n<h3>&#x1f6e0;\ufe0f \u4e09\u3001\u6cd5\u533b\u89e3\u5256&#xff1a;\u7ebf\u4e0a\u6392\u67e5\u6807\u51c6 3 \u677f\u65a7<\/h3>\n<p>\u9047\u5230\u8fd9\u79cd\u6545\u969c&#xff0c;\u7edd\u5bf9\u4e0d\u80fd\u76f2\u76ee\u91cd\u542f&#xff0c;\u5fc5\u987b\u4fdd\u7559\u6848\u53d1\u73b0\u573a&#xff01;\u8ddf\u7740\u8fd9\u4e09\u6b65\u8d70&#xff1a;<\/p>\n<h4>\u7b2c\u4e00\u65a7&#xff1a;\u5b9a\u4f4d CPU \u98d9\u5347\u7684\u7ebf\u7a0b (top &#043; jstack)<\/h4>\n<li>\u627e\u51fa\u8017 CPU \u6700\u591a\u7684\u8fdb\u7a0b PID&#xff1a;top (\u5047\u8bbe PID \u662f 12345)\u3002<\/li>\n<li>\u627e\u51fa\u8be5\u8fdb\u7a0b\u91cc\u8017 CPU \u6700\u591a\u7684\u7ebf\u7a0b ID&#xff1a;top -Hp 12345 (\u5047\u8bbe TID \u662f 12350)\u3002<\/li>\n<li>\u5c06 TID \u8f6c\u4e3a 16 \u8fdb\u5236&#xff1a;printf &#034;%x\\\\n&#034; 12350 -&gt; \u5f97\u5230 303e\u3002<\/li>\n<li>\u5bfc\u51fa\u7ebf\u7a0b\u5feb\u7167\u5e76\u67e5\u627e&#xff1a;jstack 12345 | grep -A 20 303e\u3002<\/li>\n<ul>\n<li>\u73b0\u8c61&#xff1a;\u4f60\u4f1a\u60ca\u6050\u5730\u53d1\u73b0&#xff0c;\u6700\u8017 CPU \u7684\u7ebf\u7a0b\u5168\u662f GC task thread\u3002\u8fd9\u5370\u8bc1\u4e86\u6211\u4eec\u7684\u731c\u60f3&#xff1a;\u5185\u5b58\u4e0d\u591f\u5bfc\u81f4\u9891\u7e41 Full GC&#xff0c;\u5403\u5149\u4e86 CPU\u3002<\/li>\n<\/ul>\n<h4>\u7b2c\u4e8c\u65a7&#xff1a;\u67e5\u770b\u5230\u5e95\u662f\u8c01\u5728\u5835\u8f66 (jstack \u5168\u5c40\u5206\u6790)<\/h4>\n<li>\u76f4\u63a5\u641c jstack \u65e5\u5fd7\u91cc\u7684 WAITING \u6216 BLOCKED \u72b6\u6001\u3002<\/li>\n<li>\u73b0\u8c61&#xff1a;\u4f60\u4f1a\u770b\u5230\u5927\u91cf\u7684 Tomcat \u7ebf\u7a0b (http-nio-8080-exec-*) \u505c\u7559\u5728 ForkJoinTask.join() \u6216\u8005\u7b49\u5f85\u83b7\u53d6\u6570\u636e\u5e93\u8fde\u63a5\u4e0a\u3002\u7834\u6848\u4e86&#xff01;\u7ebf\u7a0b\u5927\u9762\u79ef\u62e5\u5835\u3002<\/li>\n<h4>\u7b2c\u4e09\u65a7&#xff1a;\u89e3\u5256\u5c38\u4f53\u67e5\u627e\u5185\u5b58\u771f\u51f6 (jmap &#043; MAT)<\/h4>\n<li>\u5bfc\u51fa\u5806\u5185\u5b58\u5feb\u7167 (Heap Dump)&#xff1a;<br \/>\njmap -dump:format&#061;b,file&#061;heap.hprof 12345<br \/>\n(\u6ce8\u610f&#xff1a;\u5982\u679c\u5df2\u7ecf OOM \u5b95\u673a&#xff0c;\u8bb0\u5f97\u5728\u542f\u52a8\u811a\u672c\u52a0\u4e0a -XX:&#043;HeapDumpOnOutOfMemoryError \u8ba9\u5b83\u81ea\u52a8\u5bfc\u51fa)\u3002<\/li>\n<li>\u5c06 heap.hprof \u4e0b\u8f7d\u5230\u672c\u5730&#xff0c;\u7528 Eclipse MAT (Memory Analyzer Tool) \u6253\u5f00\u3002<\/li>\n<li>\u70b9\u51fb Leak Suspects (\u6cc4\u6f0f\u5acc\u7591\u4eba)\u3002<\/li>\n<li>\u73b0\u8c61&#xff1a;MAT \u4f1a\u660e\u786e\u544a\u8bc9\u4f60&#xff0c;\u67d0\u4e2a Tomcat ThreadPoolExecutor \u5360\u636e\u4e86 90% \u7684\u5185\u5b58&#xff0c;\u70b9\u5f00\u5b83\u7684\u5f15\u7528\u6811 (Dominator Tree)&#xff0c;\u91cc\u9762\u5168\u662f\u88ab\u6302\u8d77\u7684 parallelStream \u4efb\u52a1\u548c\u5e9e\u5927\u7684\u4e1a\u52a1\u5bf9\u8c61\u3002<\/li>\n<hr \/>\n<h3>&#x1f48a; \u56db\u3001\u7ec8\u6781\u89e3\u6cd5&#xff1a;\u7ed9\u5e76\u884c\u6d41\u7a7f\u4e0a\u201c\u9632\u62a4\u670d\u201d<\/h3>\n<p>\u7edd\u5bf9\u4e0d\u80fd\u628a\u8017\u65f6\u7684 IO \u64cd\u4f5c\u6254\u8fdb\u9ed8\u8ba4\u7684 commonPool&#xff01;\u89e3\u51b3\u65b9\u6848\u6709\u4e24\u6761&#xff1a;<\/p>\n<h4>\u89e3\u6cd5 1&#xff1a;\u653e\u5f03\u5e76\u884c\u6d41&#xff0c;\u6539\u7528\u81ea\u5b9a\u4e49\u7ebf\u7a0b\u6c60 (\u63a8\u8350)<\/h4>\n<p>\u5bf9\u4e8e\u6d89\u53ca\u6570\u636e\u5e93\u3001\u7f51\u7edc\u8c03\u7528\u7684 IO \u5bc6\u96c6\u578b\u4efb\u52a1&#xff0c;\u8001\u8001\u5b9e\u5b9e\u4f7f\u7528 ThreadPoolExecutor \u624b\u52a8\u521b\u5efa\u7ebf\u7a0b\u6c60&#xff0c;\u5e76\u914d\u7f6e\u5408\u9002\u7684\u961f\u5217\u5927\u5c0f\u548c\u62d2\u7edd\u7b56\u7565\u3002<\/p>\n<h4>\u89e3\u6cd5 2&#xff1a;\u5f3a\u5236 parallelStream \u4f7f\u7528\u81ea\u5b9a\u4e49 ForkJoinPool (\u9ed1\u79d1\u6280)<\/h4>\n<p>\u5982\u679c\u4f60\u975e\u8981\u4eab\u53d7\u5e76\u884c\u6d41\u7684\u8bed\u6cd5\u7cd6&#xff0c;\u53ef\u4ee5\u4f7f\u7528\u4e00\u4e2a\u201c\u6b3a\u9a97\u201d JVM \u7684\u6280\u5de7\u3002ForkJoin \u4efb\u52a1\u4f1a\u9ed8\u8ba4\u7ee7\u627f\u63d0\u4ea4\u5b83\u7684\u90a3\u4e2a\u7ebf\u7a0b\u6c60&#xff1a;<\/p>\n<p><span class=\"token comment\">\/\/ 1. \u5b9a\u4e49\u4e00\u4e2a\u4e13\u5c5e\u7684\u3001\u9694\u79bb\u7684\u7ebf\u7a0b\u6c60<\/span><br \/>\n<span class=\"token class-name\">ForkJoinPool<\/span> customThreadPool <span class=\"token operator\">&#061;<\/span> <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">ForkJoinPool<\/span><span class=\"token punctuation\">(<\/span><span class=\"token number\">10<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span> <\/p>\n<p><span class=\"token comment\">\/\/ 2. \u5c06 parallelStream \u5305\u88c5\u5728\u81ea\u5b9a\u4e49\u7ebf\u7a0b\u6c60\u4e2d\u63d0\u4ea4<\/span><br \/>\n<span class=\"token keyword\">try<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    customThreadPool<span class=\"token punctuation\">.<\/span><span class=\"token function\">submit<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">-&gt;<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        list<span class=\"token punctuation\">.<\/span><span class=\"token function\">parallelStream<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">forEach<\/span><span class=\"token punctuation\">(<\/span>item <span class=\"token operator\">-&gt;<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            <span class=\"token comment\">\/\/ \u8017\u65f6\u7684\u6570\u636e\u5e93\u6216\u7f51\u7edc IO \u64cd\u4f5c<\/span><br \/>\n            <span class=\"token function\">doHeavyIoOperation<\/span><span class=\"token punctuation\">(<\/span>item<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">get<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token comment\">\/\/ \u963b\u585e\u7b49\u5f85\u6267\u884c\u5b8c\u6210<\/span><br \/>\n<span class=\"token punctuation\">}<\/span> <span class=\"token keyword\">catch<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token class-name\">Exception<\/span> e<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token comment\">\/\/ \u5904\u7406\u5f02\u5e38<\/span><br \/>\n<span class=\"token punctuation\">}<\/span> <span class=\"token keyword\">finally<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token comment\">\/\/ customThreadPool.shutdown(); \/\/ \u89c6\u60c5\u51b5\u51b3\u5b9a\u662f\u5426\u5173\u95ed<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p>\u901a\u8fc7\u8fd9\u79cd\u65b9\u5f0f&#xff0c;\u5373\u4f7f\u8fd9\u91cc\u7684 10 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