{"id":101165,"date":"2026-09-06T08:56:55","date_gmt":"2026-09-06T00:56:55","guid":{"rendered":"https:\/\/www.wsisp.com\/helps\/101165.html"},"modified":"2026-09-06T08:56:55","modified_gmt":"2026-09-06T00:56:55","slug":"%e8%99%9a%e6%8b%9f%e7%ba%bf%e7%a8%8b%e5%ba%95%e5%b1%82forkjoinpool%e7%9a%84%e5%b7%a5%e4%bd%9c%e7%aa%83%e5%8f%96%e7%ae%97%e6%b3%95%e6%9c%ba%e5%88%b6","status":"publish","type":"post","link":"https:\/\/www.wsisp.com\/helps\/101165.html","title":{"rendered":"\u865a\u62df\u7ebf\u7a0b\u5e95\u5c42ForkJoinPool\u7684\u5de5\u4f5c\u7a83\u53d6\u7b97\u6cd5\u673a\u5236"},"content":{"rendered":"<\/p>\n<h4>\u865a\u62df\u7ebf\u7a0b\u5e95\u5c42ForkJoinPool\u7684\u5de5\u4f5c\u7a83\u53d6\u7b97\u6cd5\u673a\u5236<\/h4>\n<ul>\n<li>\u524d\u8a00<\/li>\n<li>\u865a\u62df\u7ebf\u7a0b\u5e95\u5c42\u5de5\u4f5c\u7a83\u53d6\u7b97\u6cd5<\/li>\n<li>\n<ul>\n<li>\u4e00\u3001 \u865a\u62df\u7ebf\u7a0b\u8c03\u5ea6\u7684\u5e95\u5c42\u627f\u8f7d\u67b6\u6784&#xff1a;ForkJoinPool \u6df1\u5ea6\u89e3\u6784<\/li>\n<li>\n<ul>\n<li>1. \u6838\u5fc3\u7ec4\u4ef6\u62c6\u89e3\u4e0e\u5185\u5b58\u5e03\u5c40<\/li>\n<\/ul>\n<\/li>\n<li>\u4e8c\u3001 Work-Stealing&#xff08;\u5de5\u4f5c\u7a83\u53d6&#xff09;\u7b97\u6cd5\u7684\u6838\u5fc3\u6570\u636e\u7ed3\u6784\u4e0e\u5e76\u53d1\u63a7\u5236<\/li>\n<li>\n<ul>\n<li>1. Top \u4e0e Base \u6307\u9488\u7684\u5e76\u53d1\u8bed\u4e49<\/li>\n<li>2. Push\u3001Pop \u4e0e Steal \u7684\u65e0\u9501\u7b97\u6cd5\u903b\u8f91<\/li>\n<li>\n<ul>\n<li>Push \u64cd\u4f5c&#xff08;Owner \u7ebf\u7a0b\u6267\u884c&#xff09;<\/li>\n<li>Pop \u64cd\u4f5c&#xff08;Owner \u7ebf\u7a0b\u6267\u884c&#xff09;<\/li>\n<li>Steal \u64cd\u4f5c&#xff08;Stealer \u7ebf\u7a0b\u6267\u884c&#xff09;<\/li>\n<\/ul>\n<\/li>\n<li>3. 64 \u4f4d &#096;ctl&#096; \u72b6\u6001\u5bc4\u5b58\u5668\u4e0e Phase-based \u6302\u8d77\u5524\u9192\u673a\u5236<\/li>\n<\/ul>\n<\/li>\n<li>\u4e09\u3001 \u865a\u62df\u7ebf\u7a0b\u4e0e ForkJoinPool \u7684\u6df1\u5c42\u4ea4\u7ec7\u4e0e Mount\/Unmount \u6d41\u7a0b<\/li>\n<li>\u56db\u3001 CPU \u5bc6\u96c6\u578b\u4e0e I\/O \u5bc6\u96c6\u578b\u6df7\u5408\u573a\u666f\u4e0b\u7684\u6027\u80fd\u74f6\u9888\u5206\u6790<\/li>\n<li>\n<ul>\n<li>1. \u75db\u70b9\u4e00&#xff1a;Carrier Thread \u88ab CPU \u5bc6\u96c6\u578b\u4efb\u52a1\u957f\u4e45\u5360\u636e&#xff08;Starvation &amp; Latency Spike&#xff09;<\/li>\n<li>2. \u75db\u70b9\u4e8c&#xff1a;\u4e0d\u53ef Unmount \u7684\u963b\u585e\u5bfc\u81f4\u7684 Carrier \u7ebf\u7a0b\u66b4\u6da8&#xff08;Compensating Threads&#xff09;<\/li>\n<\/ul>\n<\/li>\n<li>\u4e94\u3001 FIFO \u4e0e LIFO \u961f\u5217\u6a21\u5f0f\u5bf9\u6bd4\u4e0e\u6df1\u5ea6\u8c03\u4f18<\/li>\n<li>\n<ul>\n<li>1. \u961f\u5217\u6a21\u5f0f\u5e95\u5c42\u673a\u5236\u5bf9\u6bd4<\/li>\n<li>2. \u4e3a\u4ec0\u4e48\u865a\u62df\u7ebf\u7a0b\u9ed8\u8ba4\u4e14\u5fc5\u987b\u5f3a\u5236\u5f00\u542f &#096;FIFO (asyncMode)&#096;&#xff1f;<\/li>\n<\/ul>\n<\/li>\n<li>\u516d\u3001 \u6df7\u5408\u573a\u666f\u53c2\u6570\u8c03\u4f18\u4e0e\u7cfb\u7edf\u5de5\u7a0b\u6700\u4f73\u5b9e\u8df5<\/li>\n<li>\n<ul>\n<li>1. \u6838\u5fc3 JVM \u53c2\u6570\u8c03\u4f18\u77e9\u9635<\/li>\n<li>\n<ul>\n<li>\u2460 &#096;parallelism&#096;&#xff08;\u5e76\u884c\u5ea6 \/ \u6838\u5fc3 Carrier \u7ebf\u7a0b\u6570&#xff09;<\/li>\n<li>\u2461 &#096;maxPoolSize&#096;&#xff08;\u6700\u5927 Carrier \u7ebf\u7a0b\u4e0a\u9650&#xff09;<\/li>\n<li>\u2462 &#096;minRunnable&#096;&#xff08;\u6700\u5c0f\u4fdd\u8bc1\u8fd0\u884c\u7ebf\u7a0b\u6570&#xff09;<\/li>\n<\/ul>\n<\/li>\n<li>2. \u6df7\u5408\u573a\u666f\u67b6\u6784\u843d\u5730\u4e09\u5927\u539f\u5219&#xff08;\u8231\u58c1\u9694\u79bb\u4e0e\u9632 Pinning&#xff09;<\/li>\n<li>\n<ul>\n<li>\u539f\u5219\u4e00&#xff1a;CPU \u5bc6\u96c6\u578b\u4efb\u52a1\u4e0e\u865a\u62df\u7ebf\u7a0b\u89e3\u8026&#xff08;\u8231\u58c1\u9694\u79bb Bulkheading&#xff09;<\/li>\n<li>\u539f\u5219\u4e8c&#xff1a;\u5f7b\u5e95\u6d88\u9664 Pinning&#xff08;\u8f7d\u4f53\u7ebf\u7a0b\u951a\u5b9a&#xff09;<\/li>\n<li>\u539f\u5219\u4e09&#xff1a;\u63a7\u5236\u6587\u4ef6 I\/O \u7684\u5e76\u53d1\u7c92\u5ea6<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<\/li>\n<li>\u4e03\u3001 \u603b\u7ed3<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<hr \/>\n<h2>\u524d\u8a00<\/h2>\n<p>\u672c\u6587\u65e8\u5728\u8bb0\u5f55\u8fd1\u671f\u7814\u8bfbJava\u6e90\u7801\u7684\u5b66\u4e60\u5fc3\u5f97\u4e0e\u7591\u96be\u95ee\u9898\u3002\u7531\u4e8e\u4e2a\u4eba\u7406\u89e3\u6c34\u5e73\u6709\u9650&#xff0c;\u6587\u4e2d\u5185\u5bb9\u96be\u514d\u5b58\u5728\u758f\u6f0f&#xff0c;\u6073\u8bf7\u8bfb\u8005\u4e0d\u541d\u6307\u6b63\u3002<\/p>\n<h2>\u865a\u62df\u7ebf\u7a0b\u5e95\u5c42\u5de5\u4f5c\u7a83\u53d6\u7b97\u6cd5<\/h2>\n<h3>\u4e00\u3001 \u865a\u62df\u7ebf\u7a0b\u8c03\u5ea6\u7684\u5e95\u5c42\u627f\u8f7d\u67b6\u6784&#xff1a;ForkJoinPool \u6df1\u5ea6\u89e3\u6784<\/h3>\n<p>\u5728 Java 21&#043; \u7684 Project Loom \u4f53\u7cfb\u4e2d&#xff0c;\u865a\u62df\u7ebf\u7a0b&#xff08;VirtualThread&#xff09;\u5e76\u4e0d\u76f4\u63a5\u5bf9\u5e94\u64cd\u4f5c\u7cfb\u7edf\u7684\u5185\u6838\u7ebf\u7a0b&#xff0c;\u800c\u662f\u4f5c\u4e3a\u8f7b\u91cf\u7ea7\u7684 Java \u5bf9\u8c61\u5b58\u5728\u4e8e JVM \u5806\u5185\u5b58\u4e2d\u3002\u865a\u62df\u7ebf\u7a0b\u7684\u8c03\u5ea6\u5668&#xff08;Scheduler&#xff09;\u9ed8\u8ba4\u7531\u4e00\u4e2a\u4e13\u95e8\u914d\u7f6e\u7684 ForkJoinPool \u5b9e\u4f8b\u627f\u8f7d&#xff08;\u5373 VirtualThread.DEFAULT_SCHEDULER&#xff09;\u3002<\/p>\n<p>\u8be5 ForkJoinPool \u4e0e\u4f20\u7edf\u7528\u4e8e\u5206\u5316\u6c47\u603b\u8ba1\u7b97\u7684 ForkJoinPool.commonPool() \u5728\u62d3\u6251\u7ed3\u6784\u4e0e\u8c03\u5ea6\u7b56\u7565\u4e0a\u5b58\u5728\u663e\u8457\u5dee\u5f02\u3002<\/p>\n<p>&#043;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8211;&#043;<br \/>\n|                            VirtualThread.DEFAULT_SCHEDULER                        |<br \/>\n|                                (ForkJoinPool)                                     |<br \/>\n|                                                                                   |<br \/>\n|  &#043;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;-&#043;   &#043;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8211;&#043;  |<br \/>\n|  |  WorkerThread 0 (Carrier Thread)    |   |  WorkerThread 1 (Carrier Thread)  |  |<br \/>\n|  |  &#043;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;-&#043;  |   |  &#043;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;-&#043; |  |<br \/>\n|  |  | WorkQueue 1 (Deque)           |  |   |  | WorkQueue 3 (Deque)           | |  |<br \/>\n|  |  | [VT-Cont] [VT-Cont] [VT-Cont] |  |   |  | [VT-Cont] [VT-Cont]           | |  |<br \/>\n|  |  &#043;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;-&#043;  |   |  &#043;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;-&#043; |  |<br \/>\n|  &#043;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;\u2502&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#043;   &#043;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;\u25b2&#8212;&#8212;&#8212;&#8212;&#8212;-&#043;  |<br \/>\n|                     \u2502 (LIFO Pop \/ FIFO Push)                  \u2502                   |<br \/>\n|                     \u25bc                                         \u2502 (FIFO Steal)      |<br \/>\n|           Owner Thread \u72ec\u81ea\u64cd\u4f5c Top \u7aef \u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2518                   |<br \/>\n|                                                                                   |<br \/>\n|  &#043;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8211;&#043;  |<br \/>\n|  |  Submission Queues (Shared External WorkQueues: Index 0, 2, 4&#8230;)            |  |<br \/>\n|  |  [VT-Unparked]  [VT-Unparked]  [VT-Unparked]                                 |  |<br \/>\n|  &#043;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8211;&#043;  |<br \/>\n&#043;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8211;&#043;<\/p>\n<h4>1. \u6838\u5fc3\u7ec4\u4ef6\u62c6\u89e3\u4e0e\u5185\u5b58\u5e03\u5c40<\/h4>\n<ul>\n<li>\n<p>\u8f7d\u4f53\u7ebf\u7a0b&#xff08;Carrier Thread&#xff09;&#xff1a; \u5b9e\u9645\u5360\u7528\u64cd\u4f5c\u7cfb\u7edf\u5185\u6838\u7ebf\u7a0b\u8fd0\u884c\u7684\u5e73\u53f0\u7ebf\u7a0b&#xff0c;\u672c\u8d28\u4e0a\u662f ForkJoinWorkerThread\u3002\u5b83\u8d1f\u8d23\u6267\u884c\u865a\u62df\u7ebf\u7a0b\u7684 Continuation \u6808\u5e27\u3002<\/p>\n<\/li>\n<li>\n<p>\u53cc\u7aef\u5de5\u4f5c\u961f\u5217&#xff08;WorkQueue&#xff09;&#xff1a; ForkJoinPool \u5185\u90e8\u7ef4\u62a4\u4e86\u4e00\u4e2a WorkQueue[] \u6570\u7ec4\u3002<\/p>\n<\/li>\n<li>\n<p>\u5947\u6570\u7d22\u5f15\u961f\u5217&#xff08;Worker Queue&#xff09;&#xff1a; \u5c5e\u4e8e\u7279\u5b9a\u7684 Carrier Thread \u79c1\u6709&#xff0c;\u65e0\u9501\u5316\u538b\u5165\u4efb\u52a1\u3002<\/p>\n<\/li>\n<li>\n<p>\u5076\u6570\u7d22\u5f15\u961f\u5217&#xff08;Submission Queue&#xff09;&#xff1a; \u5171\u4eab\u7684\u5916\u90e8\u63d0\u4ea4\u961f\u5217\u3002\u5f53\u975e Carrier Thread&#xff08;\u5982\u7cfb\u7edf\u7684 Timer \u7ebf\u7a0b\u3001I\/O \u54cd\u5e94\u7ebf\u7a0b&#xff09;\u8c03\u7528 LockSupport.unpark(virtualThread) \u5524\u9192\u865a\u62df\u7ebf\u7a0b\u65f6&#xff0c;\u4efb\u52a1\u4f1a\u88ab\u63d0\u4ea4\u5230\u5076\u6570\u961f\u5217\u4e2d&#xff0c;\u6b64\u8fc7\u7a0b\u9700\u8981 CAS \u52a0\u9501\u6216\u9501\u91cd\u8bd5\u3002<\/p>\n<\/li>\n<li>\n<p>\u73af\u5f62\u7f13\u51b2\u533a&#xff08;WorkQueue.array&#xff09;&#xff1a; \u6bcf\u4e2a WorkQueue \u5185\u90e8\u6301\u6709\u4e00\u4e2a\u52a8\u6001\u6269\u5bb9\u7684\u6570\u7ec4&#xff0c;\u4e13\u95e8\u5b58\u653e\u5f85\u6267\u884c\u7684 ForkJoinTask&lt;?&gt;&#xff08;\u5728\u865a\u62df\u7ebf\u7a0b\u4f53\u7cfb\u4e2d&#xff0c;\u5305\u88c5\u4e3a VirtualThread.submitRunContinuation() \u8fd4\u56de\u7684 Runnable\/Task&#xff09;\u3002<\/p>\n<\/li>\n<\/ul>\n<hr \/>\n<h3>\u4e8c\u3001 Work-Stealing&#xff08;\u5de5\u4f5c\u7a83\u53d6&#xff09;\u7b97\u6cd5\u7684\u6838\u5fc3\u6570\u636e\u7ed3\u6784\u4e0e\u5e76\u53d1\u63a7\u5236<\/h3>\n<p>Work-Stealing \u7b97\u6cd5\u7684\u6838\u5fc3\u601d\u60f3\u662f&#xff1a;\u8ba9\u7a7a\u95f2\u7684 Carrier Thread&#xff08;Stealer&#xff09;\u4e3b\u52a8\u4ece\u7e41\u5fd9\u7684 Carrier Thread&#xff08;Owner&#xff09;\u7684\u961f\u5217\u5c3e\u90e8\u7a83\u53d6\u4efb\u52a1&#xff0c;\u4ee5\u6700\u5927\u5316 CPU \u6240\u6709\u6838\u5fc3\u7684\u5229\u7528\u7387&#xff0c;\u5e76\u6d88\u9664\u5168\u5c40\u9501\u7ade\u4e89\u3002<\/p>\n<h4>1. Top \u4e0e Base \u6307\u9488\u7684\u5e76\u53d1\u8bed\u4e49<\/h4>\n<p>\u6bcf\u4e2a WorkQueue \u4f9d\u9760\u4e24\u4e2a\u6838\u5fc3\u6e38\u6807\u6307\u9488\u7ef4\u6301\u53cc\u7aef\u961f\u5217\u7684\u65e0\u9501\u5e76\u53d1&#xff1a;<\/p>\n<p><span class=\"katex--display\"><span class=\"katex-display\"><span class=\"katex\"><span class=\"katex-mathml\"><\/p>\n<p>         WorkQueue<\/p>\n<p>         &#061;<\/p>\n<p>         {<\/p>\n<p>         array<\/p>\n<p>         :<\/p>\n<p>         Task<\/p>\n<p>         [<\/p>\n<p>         ]<\/p>\n<p>         ,<br \/>\n        \u2009<\/p>\n<p>         top<\/p>\n<p>         :<\/p>\n<p>         int<\/p>\n<p>         ,<br \/>\n        \u2009<\/p>\n<p>         base<\/p>\n<p>         :<\/p>\n<p>         volatile\u00a0int<\/p>\n<p>         }<\/p>\n<p>        \\\\text{WorkQueue} &#061; \\\\{ \\\\text{array}: \\\\text{Task}[], \\\\, \\\\text{top}: \\\\text{int}, \\\\, \\\\text{base}: \\\\text{volatile int} \\\\}<\/p>\n<p>     <\/span><span class=\"katex-html\"><span class=\"base\"><span class=\"strut\" style=\"height: 0.8889em;vertical-align: -0.1944em\"><\/span><span class=\"mord text\"><span class=\"mord\">WorkQueue<\/span><\/span><span class=\"mspace\" style=\"margin-right: 0.2778em\"><\/span><span class=\"mrel\">&#061;<\/span><span class=\"mspace\" style=\"margin-right: 0.2778em\"><\/span><\/span><span class=\"base\"><span class=\"strut\" style=\"height: 1em;vertical-align: -0.25em\"><\/span><span class=\"mopen\">{<\/span><span class=\"mord text\"><span class=\"mord\">array<\/span><\/span><span class=\"mspace\" style=\"margin-right: 0.2778em\"><\/span><span class=\"mrel\">:<\/span><span class=\"mspace\" style=\"margin-right: 0.2778em\"><\/span><\/span><span class=\"base\"><span class=\"strut\" style=\"height: 1em;vertical-align: -0.25em\"><\/span><span class=\"mord text\"><span class=\"mord\">Task<\/span><\/span><span class=\"mopen\">[<\/span><span class=\"mclose\">]<\/span><span class=\"mpunct\">,<\/span><span class=\"mspace\" style=\"margin-right: 0.1667em\"><\/span><span class=\"mspace\" style=\"margin-right: 0.1667em\"><\/span><span class=\"mord text\"><span class=\"mord\">top<\/span><\/span><span class=\"mspace\" style=\"margin-right: 0.2778em\"><\/span><span class=\"mrel\">:<\/span><span class=\"mspace\" style=\"margin-right: 0.2778em\"><\/span><\/span><span class=\"base\"><span class=\"strut\" style=\"height: 0.8889em;vertical-align: -0.1944em\"><\/span><span class=\"mord text\"><span class=\"mord\">int<\/span><\/span><span class=\"mpunct\">,<\/span><span class=\"mspace\" style=\"margin-right: 0.1667em\"><\/span><span class=\"mspace\" style=\"margin-right: 0.1667em\"><\/span><span class=\"mord text\"><span class=\"mord\">base<\/span><\/span><span class=\"mspace\" style=\"margin-right: 0.2778em\"><\/span><span class=\"mrel\">:<\/span><span class=\"mspace\" style=\"margin-right: 0.2778em\"><\/span><\/span><span class=\"base\"><span class=\"strut\" style=\"height: 1em;vertical-align: -0.25em\"><\/span><span class=\"mord text\"><span class=\"mord\">volatile\u00a0int<\/span><\/span><span class=\"mclose\">}<\/span><\/span><\/span><\/span><\/span><\/span><\/p>\n<p>                   \u7a83\u53d6\u7aef (Steal \/ FIFO)                             \u538b\u5165\/\u5f39\u51fa\u7aef (Push\/Pop \/ LIFO or FIFO)<br \/>\n                           \u2502                                                          \u2502<br \/>\n                           \u25bc                                                          \u25bc<br \/>\n               &#043;\u2500\u2500\u2500\u252c\u2500\u2500\u2500\u252c\u2500\u2500\u2500\u252c\u2500\u2500\u2500\u252c\u2500\u2500\u2500\u252c\u2500\u2500\u2500\u252c\u2500\u2500\u2500\u252c\u2500\u2500\u2500&#043;<br \/>\n  Array Memory |   | T | T | T | T | T |   |   |<br \/>\n               &#043;\u2500\u2500\u2500&#043;\u2500\u2500\u2500&#043;\u2500\u2500\u2500&#043;\u2500\u2500\u2500&#043;\u2500\u2500\u2500&#043;\u2500\u2500\u2500&#043;\u2500\u2500\u2500&#043;\u2500\u2500\u2500&#043;<br \/>\n                     \u25b2                   \u25b2<br \/>\n                     \u2502                   \u2502<br \/>\n                   base                 top<br \/>\n             (Stealer CAS \u4fee\u6539)     (Owner \u72ec\u5360\u4fee\u6539)<\/p>\n<ul>\n<li>top \u6307\u9488&#xff08;Owner \u72ec\u5360&#xff09;&#xff1a; \u4ec5\u7531\u5f53\u524d WorkQueue \u7684\u5f52\u5c5e Carrier Thread \u4fee\u6539\u3002Push \u548c Pop \u64cd\u4f5c\u9ed8\u8ba4\u5728 top \u7aef\u8fdb\u884c\u3002\u7531\u4e8e\u662f\u5355\u7ebf\u7a0b\u5199\u5165&#xff0c;top \u7684\u9012\u589e\/\u9012\u51cf\u4e0d\u9700\u8981\u91cd\u91cf\u7ea7\u7684 CAS \u6307\u4ee4&#xff0c;\u4ec5\u9700 VarHandle.setRelease \u4fdd\u8bc1\u5185\u5b58\u5c4f\u969c\u8bed\u4e49\u3002<\/li>\n<li>base \u6307\u9488&#xff08;\u591a\u7ebf\u7a0b\u5171\u4eab&#xff09;&#xff1a; \u8bb0\u5f55\u961f\u5217\u4e2d\u6700\u65e9\u5165\u961f\u7684\u4efb\u52a1\u4f4d\u7f6e\u3002\u5f53\u5176\u4ed6\u7a7a\u95f2 Carrier Thread \u524d\u6765\u7a83\u53d6\u4efb\u52a1\u65f6&#xff0c;\u901a\u8fc7 CAS \u6307\u4ee4\u9012\u589e base&#xff0c;\u4ece base \u7aef\u62c9\u53d6\u4efb\u52a1&#xff08;FIFO \u987a\u5e8f&#xff09;\u3002<\/li>\n<\/ul>\n<h4>2. Push\u3001Pop \u4e0e Steal \u7684\u65e0\u9501\u7b97\u6cd5\u903b\u8f91<\/h4>\n<h5>Push \u64cd\u4f5c&#xff08;Owner \u7ebf\u7a0b\u6267\u884c&#xff09;<\/h5>\n<p>\u5f53\u5f53\u524d Carrier Thread \u4ea7\u751f\u7684\u65b0\u7684\u865a\u62df\u7ebf\u7a0b\u53d8\u4e3a Runnable \u72b6\u6001\u65f6&#xff1a;<\/p>\n<p><span class=\"token comment\">\/\/ \u7b80\u5316\u540e\u7684\u903b\u8f91\u793a\u610f&#xff08;\u57fa\u4e8e Java 21 \u6e90\u7801 VarHandle \u539f\u8bed&#xff09;<\/span><br \/>\n<span class=\"token keyword\">final<\/span> <span class=\"token keyword\">void<\/span> <span class=\"token function\">push<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">ForkJoinTask<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token operator\">?<\/span><span class=\"token punctuation\">&gt;<\/span><\/span> task<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">int<\/span> b <span class=\"token operator\">&#061;<\/span> base<span class=\"token punctuation\">,<\/span> s <span class=\"token operator\">&#061;<\/span> top<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token class-name\">ForkJoinTask<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token operator\">?<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><span class=\"token punctuation\">[<\/span><span class=\"token punctuation\">]<\/span> a <span class=\"token operator\">&#061;<\/span> array<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>a <span class=\"token operator\">!&#061;<\/span> <span class=\"token keyword\">null<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">int<\/span> m <span class=\"token operator\">&#061;<\/span> a<span class=\"token punctuation\">.<\/span>length <span class=\"token operator\">&#8211;<\/span> <span class=\"token number\">1<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token comment\">\/\/ \u5c06\u4efb\u52a1\u5199\u5165\u73af\u5f62\u6570\u7ec4 top \u4f4d\u7f6e (\u4f7f\u7528 Release \u8bed\u4e49)<\/span><br \/>\n        <span class=\"token constant\">QA<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">setRelease<\/span><span class=\"token punctuation\">(<\/span>a<span class=\"token punctuation\">,<\/span> i<span class=\"token punctuation\">,<\/span> task<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token comment\">\/\/ top \u6307\u9488\u52a0 1<\/span><br \/>\n        <span class=\"token constant\">TOP<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">setRelease<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">this<\/span><span class=\"token punctuation\">,<\/span> s <span class=\"token operator\">&#043;<\/span> <span class=\"token number\">1<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">int<\/span> sub <span class=\"token operator\">&#061;<\/span> s <span class=\"token operator\">&#8211;<\/span> b<span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token comment\">\/\/ \u82e5\u961f\u5217\u6ee1&#xff0c;\u89e6\u53d1\u6269\u5bb9\u6216\u5524\u9192\u5176\u4ed6\u7a7a\u95f2 Worker<\/span><br \/>\n        <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>sub <span class=\"token operator\">&lt;&#061;<\/span> <span class=\"token number\">1<\/span><span class=\"token punctuation\">)<\/span><br \/>\n            <span class=\"token function\">signalWork<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">else<\/span> <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>sub <span class=\"token operator\">&gt;&#061;<\/span> m<span class=\"token punctuation\">)<\/span><br \/>\n            <span class=\"token function\">growArray<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<h5>Pop \u64cd\u4f5c&#xff08;Owner \u7ebf\u7a0b\u6267\u884c&#xff09;<\/h5>\n<p>Owner \u7ebf\u7a0b\u4f18\u5148\u4ece\u81ea\u5df1\u7684 top \u7aef\u83b7\u53d6\u4efb\u52a1&#xff1a;<\/p>\n<p><span class=\"token keyword\">final<\/span> <span class=\"token class-name\">ForkJoinTask<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token operator\">?<\/span><span class=\"token punctuation\">&gt;<\/span><\/span> <span class=\"token function\">pop<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">int<\/span> b <span class=\"token operator\">&#061;<\/span> base<span class=\"token punctuation\">,<\/span> s <span class=\"token operator\">&#061;<\/span> top<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token class-name\">ForkJoinTask<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token operator\">?<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><span class=\"token punctuation\">[<\/span><span class=\"token punctuation\">]<\/span> a <span class=\"token operator\">&#061;<\/span> array<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>a <span class=\"token operator\">!&#061;<\/span> <span class=\"token keyword\">null<\/span> <span class=\"token operator\">&amp;&amp;<\/span> b <span class=\"token operator\">!&#061;<\/span> s<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">int<\/span> i <span class=\"token operator\">&#061;<\/span> <span class=\"token punctuation\">(<\/span>a<span class=\"token punctuation\">.<\/span>length <span class=\"token operator\">&#8211;<\/span> <span class=\"token number\">1<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&amp;<\/span> <span class=\"token operator\">&#8212;<\/span>s<span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token comment\">\/\/ \u9884\u6263 top \u6307\u9488<\/span><br \/>\n        <span class=\"token constant\">TOP<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">setRelease<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">this<\/span><span class=\"token punctuation\">,<\/span> s<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token class-name\">ForkJoinTask<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token operator\">?<\/span><span class=\"token punctuation\">&gt;<\/span><\/span> t <span class=\"token operator\">&#061;<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token class-name\">ForkJoinTask<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token operator\">?<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><span class=\"token punctuation\">)<\/span> <span class=\"token constant\">QA<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">getAcquire<\/span><span class=\"token punctuation\">(<\/span>a<span class=\"token punctuation\">,<\/span> i<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>t <span class=\"token operator\">&#061;&#061;<\/span> <span class=\"token keyword\">null<\/span><span class=\"token punctuation\">)<\/span><br \/>\n            <span class=\"token keyword\">return<\/span> <span class=\"token keyword\">null<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token comment\">\/\/ \u88ab\u7a83\u53d6\u6216\u7a7a<\/span><br \/>\n        <span class=\"token comment\">\/\/ \u5c06\u6570\u7ec4\u5bf9\u5e94\u4f4d\u7f6e\u7f6e\u7a7a<\/span><br \/>\n        <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token constant\">QA<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">compareAndSet<\/span><span class=\"token punctuation\">(<\/span>a<span class=\"token punctuation\">,<\/span> i<span class=\"token punctuation\">,<\/span> t<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">null<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><br \/>\n            <span class=\"token keyword\">return<\/span> t<span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token comment\">\/\/ \u4e34\u754c\u70b9&#xff1a;\u5f53\u53ea\u5269\u4e0b\u6700\u540e\u4e00\u4e2a\u5143\u7d20 (s &#061;&#061; b) \u65f6&#xff0c;Owner \u4e0e Stealer \u4ea7\u751f\u7ade\u4e89&#xff0c;\u9000\u5316\u4e3a CAS<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n    <span class=\"token keyword\">return<\/span> <span class=\"token keyword\">null<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<h5>Steal \u64cd\u4f5c&#xff08;Stealer \u7ebf\u7a0b\u6267\u884c&#xff09;<\/h5>\n<p>\u5f53 Carrier Thread \u81ea\u8eab\u7684\u961f\u5217\u4e3a\u7a7a\u65f6&#xff0c;\u8fdb\u5165 scan() \u9636\u6bb5&#xff0c;\u968f\u673a\u6311\u9009\u5176\u4ed6 WorkQueue \u5c1d\u8bd5\u7a83\u53d6&#xff1a;<\/p>\n<p><span class=\"token keyword\">final<\/span> <span class=\"token class-name\">ForkJoinTask<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token operator\">?<\/span><span class=\"token punctuation\">&gt;<\/span><\/span> <span class=\"token function\">pollAt<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">int<\/span> b<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token class-name\">ForkJoinTask<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token operator\">?<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><span class=\"token punctuation\">[<\/span><span class=\"token punctuation\">]<\/span> a <span class=\"token operator\">&#061;<\/span> array<span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>a <span class=\"token operator\">!&#061;<\/span> <span class=\"token keyword\">null<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token keyword\">int<\/span> i <span class=\"token operator\">&#061;<\/span> <span class=\"token punctuation\">(<\/span>a<span class=\"token punctuation\">.<\/span>length <span class=\"token operator\">&#8211;<\/span> <span class=\"token number\">1<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token operator\">&amp;<\/span> b<span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token class-name\">ForkJoinTask<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token operator\">?<\/span><span class=\"token punctuation\">&gt;<\/span><\/span> t <span class=\"token operator\">&#061;<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token class-name\">ForkJoinTask<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token operator\">?<\/span><span class=\"token punctuation\">&gt;<\/span><\/span><span class=\"token punctuation\">)<\/span> <span class=\"token constant\">QA<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">getAcquire<\/span><span class=\"token punctuation\">(<\/span>a<span class=\"token punctuation\">,<\/span> i<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n        <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>t <span class=\"token operator\">!&#061;<\/span> <span class=\"token keyword\">null<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n            <span class=\"token comment\">\/\/ CAS \u66f4\u65b0 base&#xff1a;\u4ece b \u53d8\u4e3a b &#043; 1<\/span><br \/>\n            <span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span><span class=\"token constant\">BASE<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">compareAndSet<\/span><span class=\"token punctuation\">(<\/span><span class=\"token keyword\">this<\/span><span class=\"token punctuation\">,<\/span> b<span class=\"token punctuation\">,<\/span> b <span class=\"token operator\">&#043;<\/span> <span class=\"token number\">1<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n                <span class=\"token constant\">QA<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">setRelease<\/span><span class=\"token punctuation\">(<\/span>a<span class=\"token punctuation\">,<\/span> i<span class=\"token punctuation\">,<\/span> <span class=\"token keyword\">null<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token comment\">\/\/ \u6e05\u7a7a\u5df2\u88ab\u7a83\u53d6\u7684\u69fd\u4f4d<\/span><br \/>\n                <span class=\"token keyword\">return<\/span> t<span class=\"token punctuation\">;<\/span><br \/>\n            <span class=\"token punctuation\">}<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n    <span class=\"token keyword\">return<\/span> <span class=\"token keyword\">null<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<h4>3. 64 \u4f4d ctl \u72b6\u6001\u5bc4\u5b58\u5668\u4e0e Phase-based \u6302\u8d77\u5524\u9192\u673a\u5236<\/h4>\n<p>ForkJoinPool \u6ca1\u6709\u4f7f\u7528\u4f20\u7edf\u7684 ReentrantLock \u6765\u7ba1\u7406\u7ebf\u7a0b\u6c60\u72b6\u6001&#xff0c;\u800c\u662f\u4f9d\u8d56\u4e00\u4e2a volatile long ctl 64 \u4f4d\u590d\u5408\u590d\u5408\u72b6\u6001\u5bc4\u5b58\u5668&#xff1a;<\/p>\n<p>&#043;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;-&#043;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;-&#043;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;-&#043;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;-&#043;<br \/>\n|  AC (Active Count)|  TC (Total Count) |   SS (Status\/Seq) |   ID (Parked Head)|<br \/>\n|      16 bits      |      16 bits      |      16 bits      |      16 bits      |<br \/>\n&#043;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;-&#043;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;-&#043;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;-&#043;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;-&#043;<br \/>\n 63               48 47               32 31               16 15                0<\/p>\n<ul>\n<li>AC (Active Count)&#xff1a; \u6b63\u5728\u6267\u884c\u4efb\u52a1\u7684\u6d3b\u8dc3 Carrier Thread \u6570\u91cf\u3002\u5982\u679c AC &lt;&#061; 0&#xff0c;\u8bf4\u660e\u6ca1\u6709\u8db3\u591f\u7684\u7ebf\u7a0b\u5728\u5904\u7406\u4efb\u52a1\u3002<\/li>\n<li>TC (Total Count)&#xff1a; \u5f53\u524d\u6c60\u5185\u521b\u5efa\u7684\u603b Carrier Thread \u6570\u91cf\u3002<\/li>\n<li>SS (Status\/Seq) &#043; ID&#xff1a; \u6784\u6210\u4e00\u4e2a Treiber Stack&#xff08;\u65e0\u9501\u65e0\u6808\u9501&#xff09;&#xff0c;\u4fdd\u5b58\u5f53\u524d\u88ab LockSupport.park() \u6302\u8d77&#xff08;\u4f11\u7720&#xff09;\u7684 Carrier Thread \u94fe\u8868\u5934\u8282\u70b9\u53ca\u7248\u672c\u53f7&#xff08;\u9632 ABA \u95ee\u9898&#xff09;\u3002<\/li>\n<\/ul>\n<p>\u4f2a\u968f\u673a\u626b\u63cf\u4e0e\u9000\u907f&#xff08;Scan &amp; Park&#xff09;&#xff1a;<\/p>\n<li>Step 1&#xff1a; \u7ebf\u7a0b\u751f\u6210\u4e00\u4e2a\u4f2a\u968f\u673a\u6b65\u957f&#xff0c;\u904d\u5386 WorkQueue[] \u6570\u7ec4\u3002<\/li>\n<li>Step 2&#xff1a; \u5982\u679c\u626b\u63cf\u4e00\u5708\u672a\u53d1\u73b0\u53ef\u7a83\u53d6\u4efb\u52a1&#xff0c;\u8c03\u7528 Thread.yield() \u964d\u4f4e CPU \u5360\u7528\u3002<\/li>\n<li>Step 3&#xff1a; \u8fde\u7eed\u591a\u6b21\u626b\u63cf&#xff08;Scan&#xff09;\u5931\u8d25\u540e&#xff0c;\u66f4\u65b0 ctl \u5c06\u81ea\u8eab\u63a8\u5165\u7a7a\u95f2\u7ebf\u7a0b\u6808&#xff08;Treiber Stack&#xff09;&#xff0c;\u5e76\u8c03\u7528 LockSupport.park() \u6302\u8d77\u5185\u6838\u7ebf\u7a0b&#xff0c;\u7b49\u5f85\u65b0\u7684\u865a\u62df\u7ebf\u7a0b\u88ab\u5524\u9192\u65f6\u901a\u8fc7 signalWork() \u7cbe\u51c6 Unpark\u3002<\/li>\n<hr \/>\n<h3>\u4e09\u3001 \u865a\u62df\u7ebf\u7a0b\u4e0e ForkJoinPool \u7684\u6df1\u5c42\u4ea4\u7ec7\u4e0e Mount\/Unmount \u6d41\u7a0b<\/h3>\n<p>\u865a\u62df\u7ebf\u7a0b\u7684\u8c03\u5ea6\u5e76\u4e0d\u662f\u628a\u865a\u62df\u7ebf\u7a0b\u76f4\u63a5\u653e\u5230 Carrier \u961f\u5217\u91cc&#xff0c;\u800c\u662f\u5c06\u5176\u5c01\u88c5\u4e3a Continuation\u3002<\/p>\n<p>[VirtualThread.run()]<br \/>\n        \u2502<br \/>\n        \u25bc<br \/>\n[Continuation.run()]<br \/>\n        \u2502<br \/>\n        \u251c\u2500\u2500\u2500&gt; \u6b63\u5e38\u6267\u884c\u4e1a\u52a1\u4ee3\u7801<br \/>\n        \u2502<br \/>\n        \u2514\u2500\u2500\u2500&gt; \u9047\u5230 blocking I\/O \u6216 LockSupport.park()<br \/>\n                \u2502<br \/>\n                \u25bc<br \/>\n        [Continuation.yield()]<br \/>\n                \u2502<br \/>\n                \u251c\u2500\u2500\u2500&gt; 1. \u5c06 CPU \u5bc4\u5b58\u5668\u4e0e JVM \u6808\u5e27\u4fdd\u5b58\u81f3 Heap (VirtualThread \u5b9e\u4f8b\u5185)<br \/>\n                \u251c\u2500\u2500\u2500&gt; 2. VirtualThread \u72b6\u6001\u4ece RUNNING \u53d8\u4e3a PARKED<br \/>\n                \u2514\u2500\u2500\u2500&gt; 3. Carrier Thread \u76f4\u63a5\u8c03\u7528 top\/pop() \u6216 scan() \u83b7\u53d6\u4e0b\u4e00\u4e2a VT<\/p>\n<p>\u5f53\u88ab\u963b\u585e\u7684\u865a\u62df\u7ebf\u7a0b\u6536\u5230\u4e86\u7f51\u7edc I\/O \u5c31\u7eea\u4fe1\u53f7&#xff08;\u901a\u8fc7 JVM \u5185\u90e8\u7684 Poller\/epoll \u7ebf\u7a0b&#xff09;&#xff1a;<\/p>\n<li>Poller \u7ebf\u7a0b\u627e\u5230\u8be5\u865a\u62df\u7ebf\u7a0b\u5bf9\u5e94\u7684 VirtualThread \u5bf9\u8c61\u3002<\/li>\n<li>\u4fee\u6539\u5176\u72b6\u6001\u4e3a RUNNABLE\u3002<\/li>\n<li>\u5c06\u865a\u62df\u7ebf\u7a0b\u7684 runContinuation \u4efb\u52a1\u6295\u9012\u5230 ForkJoinPool \u7684 Submission Queue&#xff08;\u5076\u6570\u7d22\u5f15\u961f\u5217&#xff09;\u6216\u5f53\u524d Carrier Thread \u7684 Worker Queue \u4e2d\u3002<\/li>\n<li>\u6267\u884c signalWork()&#xff0c;\u5524\u9192\u6302\u8d77\u7684 Carrier Thread \u91cd\u65b0\u6302\u8f7d&#xff08;Mount&#xff09;\u8be5 Continuation \u7ee7\u7eed\u6267\u884c\u3002<\/li>\n<hr \/>\n<h3>\u56db\u3001 CPU \u5bc6\u96c6\u578b\u4e0e I\/O \u5bc6\u96c6\u578b\u6df7\u5408\u573a\u666f\u4e0b\u7684\u6027\u80fd\u74f6\u9888\u5206\u6790<\/h3>\n<p>\u5728\u771f\u5b9e\u7684\u5fae\u670d\u52a1\u6216\u590d\u6742\u4e1a\u52a1\u573a\u666f\u4e2d&#xff0c;\u5e94\u7528\u5f80\u5f80\u65e2\u5305\u542b\u5927\u91cf\u7684\u7f51\u7edc\/\u6570\u636e\u5e93 I\/O&#xff0c;\u53c8\u5305\u542b JSON \u5e8f\u5217\u5316\u3001\u52a0\u5bc6\u89e3\u5bc6\u3001\u89c4\u5219\u5f15\u64ce\u7b49 CPU \u5bc6\u96c6\u578b\u8ba1\u7b97\u3002\u5728\u865a\u62df\u7ebf\u7a0b\u67b6\u6784\u4e0b&#xff0c;\u8fd9\u79cd\u6df7\u5408\u573a\u666f\u6781\u5176\u5bb9\u6613\u89e6\u53d1\u4ee5\u4e0b\u6027\u80fd\u9677\u9631&#xff1a;<\/p>\n<h4>1. \u75db\u70b9\u4e00&#xff1a;Carrier Thread \u88ab CPU \u5bc6\u96c6\u578b\u4efb\u52a1\u957f\u4e45\u5360\u636e&#xff08;Starvation &amp; Latency Spike&#xff09;<\/h4>\n<p>\u865a\u62df\u7ebf\u7a0b\u662f\u975e\u62a2\u5360\u5f0f\u8c03\u5ea6&#xff08;Non-preemptive Scheduling&#xff09;\u3002\u53ea\u6709\u5f53\u865a\u62df\u7ebf\u7a0b\u4e3b\u52a8\u8c03\u7528\u4e86\u53ef\u6302\u8d77\u7684\u65b9\u6cd5&#xff08;\u5982 Socket I\/O\u3001Thread.sleep()\u3001LockSupport.park()&#xff09;\u65f6&#xff0c;Continuation.yield() \u624d\u4f1a\u89e6\u53d1 Unmount\u3002<\/p>\n<p>\u5982\u679c\u67d0\u4e2a\u865a\u62df\u7ebf\u7a0b\u5728\u6267\u884c\u4e00\u6bb5\u8017\u65f6 200ms \u7684 CPU \u5bc6\u96c6\u578b\u8ba1\u7b97&#xff08;\u5982\u5927 JSON \u89e3\u6790\/\u56fe\u50cf\u5904\u7406&#xff09;&#xff1a;<\/p>\n<ul>\n<li>\u8be5\u865a\u62df\u7ebf\u7a0b\u5c06\u4e00\u76f4\u9501\u6b7b\u5f53\u524d\u7684 Carrier Thread\u3002<\/li>\n<li>Carrier Thread \u65e0\u6cd5\u5265\u79bb\u8be5 VT&#xff0c;\u5176 WorkQueue \u540e\u65b9\u6392\u961f\u7684\u5176\u5b83 I\/O \u578b\u865a\u62df\u7ebf\u7a0b\u65e0\u6cd5\u5f97\u5230\u54cd\u5e94\u3002<\/li>\n<li>\u5bfc\u81f4\u7cfb\u7edf P99\/P999 \u670d\u52a1\u54cd\u5e94\u5ef6\u8fdf&#xff08;Tail Latency&#xff09;\u5267\u70c8\u98d9\u5347\u3002<\/li>\n<\/ul>\n<h4>2. \u75db\u70b9\u4e8c&#xff1a;\u4e0d\u53ef Unmount \u7684\u963b\u585e\u5bfc\u81f4\u7684 Carrier \u7ebf\u7a0b\u66b4\u6da8&#xff08;Compensating Threads&#xff09;<\/h4>\n<p>\u5f53\u865a\u62df\u7ebf\u7a0b\u9677\u5165\u771f\u6b63\u7684\u64cd\u4f5c\u7cfb\u7edf\u7ea7\u963b\u585e&#xff08;\u4f8b\u5982&#xff1a;synchronized \u5757\u5f15\u8d77\u7684 Pinning\u3001\u539f\u751f JNI \u8c03\u7528\u3001\u6587\u4ef6 FileChannel \u540c\u6b65\u8bfb\u5199&#xff09;&#xff1a;<\/p>\n<ul>\n<li>JVM \u65e0\u6cd5\u89e6\u53d1 Continuation.yield()\u3002<\/li>\n<li>ForkJoinPool \u4f9d\u9760 ManagedBlocker \u673a\u5236\u68c0\u6d4b\u5230 AC&#xff08;\u6d3b\u8dc3\u7ebf\u7a0b\u6570&#xff09;\u4e0b\u964d\u3002<\/li>\n<li>\u4e3a\u4e86\u7ef4\u6301\u7cfb\u7edf\u9884\u8bbe\u7684 parallelism \u541e\u5410\u91cf&#xff0c;FJP \u4f1a\u88ab\u8feb\u521b\u5efa\u65b0\u7684 Carrier Thread&#xff08;Compensating Thread&#xff09;\u3002<\/li>\n<li>\u4e00\u65e6\u5e76\u53d1\u91cf\u6fc0\u589e&#xff0c;Carrier Thread \u6570\u91cf\u53ef\u80fd\u8fc5\u901f\u8fbe\u5230\u9ed8\u8ba4\u4e0a\u9650&#xff08;maxPoolSize &#061; 256&#xff09;&#xff0c;\u5f15\u53d1\u5267\u70c8\u7684\u64cd\u4f5c\u7cfb\u7edf\u7ebf\u7a0b\u4e0a\u4e0b\u6587\u5207\u6362&#xff0c;\u76f4\u63a5\u51fb\u7a7f\u7cfb\u7edf CPU \u7f13\u5b58&#xff08;L1\/L2 Cache&#xff09;\u3002<\/li>\n<\/ul>\n<hr \/>\n<h3>\u4e94\u3001 FIFO \u4e0e LIFO \u961f\u5217\u6a21\u5f0f\u5bf9\u6bd4\u4e0e\u6df1\u5ea6\u8c03\u4f18<\/h3>\n<p>ForkJoinPool \u5185\u90e8\u652f\u6301\u4e24\u79cd\u4efb\u52a1\u83b7\u53d6\u6a21\u5f0f&#xff1a;LIFO&#xff08;\u540e\u8fdb\u5148\u51fa&#xff09;\u4e0e FIFO&#xff08;\u5148\u8fdb\u5148\u51fa&#xff0c;\u4e5f\u79f0 asyncMode&#xff09;\u3002<\/p>\n<h4>1. \u961f\u5217\u6a21\u5f0f\u5e95\u5c42\u673a\u5236\u5bf9\u6bd4<\/h4>\n<table>\n<tr>\u7279\u6027LIFO \u6a21\u5f0f (asyncMode &#061; false)FIFO \u6a21\u5f0f (asyncMode &#061; true)<\/tr>\n<tbody>\n<tr>\n<td>\u4efb\u52a1\u5f39\u51fa\u65b9\u5411<\/td>\n<td>\u5c40\u90e8 Owner \u7ebf\u7a0b\u4ece top \u7aef Pop&#xff08;\u540e\u538b\u5165\u7684\u5148\u6267\u884c&#xff09;<\/td>\n<td>\u5c40\u90e8 Owner \u7ebf\u7a0b\u4ece base \u7aef Poll&#xff08;\u5148\u538b\u5165\u7684\u5148\u6267\u884c&#xff09;<\/td>\n<\/tr>\n<tr>\n<td>\u7b97\u6cd5\u503e\u5411<\/td>\n<td>\u6df1\u5ea6\u4f18\u5148&#xff08;Depth-First&#xff09;<\/td>\n<td>\u5e7f\u5ea6\u4f18\u5148&#xff08;Breadth-First&#xff09;<\/td>\n<\/tr>\n<tr>\n<td>CPU \u7f13\u5b58\u5229\u7528\u7387<\/td>\n<td>\u6781\u9ad8&#xff08;\u521a\u751f\u6210\u7684\u4efb\u52a1\u6570\u636e\u8fd8\u5728 L1\/L2 Cache \u4e2d&#xff09;<\/td>\n<td>\u8f83\u4f4e&#xff08;\u5148\u5165\u961f\u7684\u4efb\u52a1\u7f13\u5b58\u53ef\u80fd\u5df2\u7ecf\u5931\u6548&#xff09;<\/td>\n<\/tr>\n<tr>\n<td>\u516c\u5e73\u6027\u4e0e\u5ef6\u8fdf\u5206\u5e03<\/td>\n<td>\u4e0d\u4fdd\u8bc1\u516c\u5e73&#xff0c;\u5148\u5165\u961f\u4efb\u52a1\u53ef\u80fd\u9677\u5165\u957f\u5c3e\u5ef6\u8fdf<\/td>\n<td>\u4e25\u683c\u4fdd\u8bc1\u516c\u5e73\u6027&#xff0c;\u4efb\u52a1\u54cd\u5e94\u65f6\u95f4\u5206\u5e03\u5747\u5300<\/td>\n<\/tr>\n<tr>\n<td>\u9002\u7528\u573a\u666f<\/td>\n<td>\u4f20\u7edf Fork\/Join \u5206\u6cbb\u8ba1\u7b97&#xff08;\u5982 RecursiveTask&#xff09;<\/td>\n<td>\u865a\u62df\u7ebf\u7a0b\u8c03\u5ea6\u3001\u4e8b\u4ef6\u9a71\u52a8\u3001HTTP \u8bf7\u6c42\u5904\u7406<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h4>2. \u4e3a\u4ec0\u4e48\u865a\u62df\u7ebf\u7a0b\u9ed8\u8ba4\u4e14\u5fc5\u987b\u5f3a\u5236\u5f00\u542f FIFO (asyncMode)&#xff1f;<\/h4>\n<p>\u5728 VirtualThread.DEFAULT_SCHEDULER \u4e2d&#xff0c;FJP \u7684 asyncMode \u88ab\u786c\u7f16\u7801\u8bbe\u7f6e\u4e3a true&#xff08;\u5373 FIFO \u6a21\u5f0f&#xff09;\u3002<\/p>\n<p>\u7406\u7531\u5982\u4e0b&#xff1a; \u5f53\u4e00\u4e2a\u865a\u62df\u7ebf\u7a0b\u5904\u7406\u7f51\u7edc\u8bf7\u6c42\u65f6&#xff0c;\u53ef\u80fd\u4f1a\u9891\u7e41\u89e6\u53d1 unpark() \u5e76\u91cd\u65b0\u538b\u5165 WorkQueue\u3002<\/p>\n<ul>\n<li>\u5982\u679c\u4f7f\u7528 LIFO \u6a21\u5f0f&#xff1a;\u6700\u65b0\u88ab\u5524\u9192\u7684\u865a\u62df\u7ebf\u7a0b\u603b\u662f\u4f18\u5148\u62a2\u5360 CPU&#xff0c;\u6781\u5ea6\u6d3b\u8dc3\u7684 VT \u4f1a\u5bfc\u81f4\u65e9\u671f\u6302\u8d77\u4f46\u5df2\u88ab\u5524\u9192\u7684 VT \u957f\u671f\u65e0\u6cd5\u83b7\u5f97 Carrier \u6267\u884c\u6743&#xff0c;\u9020\u6210\u4e25\u91cd\u7684\u7ebf\u7a0b\u9965\u997f&#xff08;Starvation&#xff09;\u4e0e\u9ad8 P99 \u5ef6\u8fdf\u3002<\/li>\n<li>\u5982\u679c\u4f7f\u7528 FIFO \u6a21\u5f0f&#xff1a;\u6240\u6709\u5c31\u7eea\u7684\u865a\u62df\u7ebf\u7a0b\u6309\u7167\u5165\u961f\u987a\u5e8f\u4f9d\u6b21\u6392\u961f Mount \u5230 Carrier Thread \u4e0a&#xff0c;\u786e\u4fdd\u4e86\u5904\u7406\u8bf7\u6c42\u7684\u54cd\u5e94\u65f6\u95f4\u516c\u5e73\u6027&#xff08;Fairness&#xff09;\u3002<\/li>\n<\/ul>\n<hr \/>\n<h3>\u516d\u3001 \u6df7\u5408\u573a\u666f\u53c2\u6570\u8c03\u4f18\u4e0e\u7cfb\u7edf\u5de5\u7a0b\u6700\u4f73\u5b9e\u8df5<\/h3>\n<p>\u4e3a\u4e86\u5728 CPU \u5bc6\u96c6\u4e0e I\/O \u5bc6\u96c6\u6df7\u5408\u7684\u9ad8\u5e76\u53d1\u573a\u666f\u4e0b\u6700\u5927\u5316\u865a\u62df\u7ebf\u7a0b\u541e\u5410\u91cf&#xff0c;\u5fc5\u987b\u9488\u5bf9 JVM \u53c2\u6570\u53ca\u4ee3\u7801\u67b6\u6784\u8fdb\u884c\u7cbe\u51c6\u8c03\u4f18\u3002<\/p>\n<h4>1. \u6838\u5fc3 JVM \u53c2\u6570\u8c03\u4f18\u77e9\u9635<\/h4>\n<p>\u865a\u62df\u7ebf\u7a0b\u8c03\u5ea6\u5668\u63d0\u4f9b\u4e86\u4e00\u7cfb\u5217\u4ee5 jdk.virtualThreadScheduler. \u5f00\u5934\u7684\u7cfb\u7edf\u5c5e\u6027&#xff1a;<\/p>\n<p><span class=\"token function\">java<\/span> <span class=\"token punctuation\">\\\\<\/span><br \/>\n  <span class=\"token parameter variable\">-Djdk.virtualThreadScheduler.parallelism<\/span><span class=\"token operator\">&#061;<\/span><span class=\"token number\">16<\/span> <span class=\"token punctuation\">\\\\<\/span><br \/>\n  <span class=\"token parameter variable\">-Djdk.virtualThreadScheduler.maxPoolSize<\/span><span class=\"token operator\">&#061;<\/span><span class=\"token number\">32<\/span> <span class=\"token punctuation\">\\\\<\/span><br \/>\n  <span class=\"token parameter variable\">-Djdk.virtualThreadScheduler.minRunnable<\/span><span class=\"token operator\">&#061;<\/span><span class=\"token number\">8<\/span> <span class=\"token punctuation\">\\\\<\/span><br \/>\n  <span class=\"token parameter variable\">-Djdk.tracePinnedThreads<\/span><span class=\"token operator\">&#061;<\/span>short <span class=\"token punctuation\">\\\\<\/span><br \/>\n  <span class=\"token parameter variable\">-jar<\/span> app.jar<\/p>\n<h5>\u2460 parallelism&#xff08;\u5e76\u884c\u5ea6 \/ \u6838\u5fc3 Carrier \u7ebf\u7a0b\u6570&#xff09;<\/h5>\n<ul>\n<li>\u9ed8\u8ba4\u503c&#xff1a; Runtime.getRuntime().availableProcessors()&#xff08;\u903b\u8f91 CPU \u6838\u5fc3\u6570&#xff09;\u3002<\/li>\n<li>\u8c03\u4f18\u7b56\u7565&#xff1a;<\/li>\n<li>\u7eaf\u975e\u963b\u585e I\/O \u573a\u666f&#xff1a; \u4fdd\u6301\u9ed8\u8ba4\u503c\u5373\u53ef\u3002\u589e\u52a0 parallelism \u5e76\u4e0d\u80fd\u63d0\u5347\u7f51\u7edc I\/O \u541e\u5410&#xff0c;\u53cd\u800c\u589e\u52a0\u7ebf\u7a0b\u5207\u6362\u5f00\u9500\u3002<\/li>\n<li>\u6df7\u5408\u578b\u573a\u666f&#xff08;\u542b CPU \u8ba1\u7b97&#xff09;&#xff1a; \u5343\u4e07\u4e0d\u8981\u4e3a\u4e86\u89e3\u51b3 CPU \u5bc6\u96c6\u8ba1\u7b97\u6162\u800c\u76f2\u76ee\u8c03\u5927 parallelism&#xff01;\u8fd9\u4f1a\u5bfc\u81f4 CPU \u6838\u5fc3\u8fc7\u5ea6\u4e0a\u4e0b\u6587\u5207\u6362\u3002\u5e94\u8be5\u5c06 parallelism \u7ef4\u6301\u5728\u7269\u7406 CPU \u6838\u5fc3\u6570\u9644\u8fd1&#xff08;\u4f8b\u5982\u8bbe\u7f6e\u4e3a <span class=\"katex--inline\"><span class=\"katex\"><span class=\"katex-mathml\">\n<p>         N<\/p>\n<p>        N<\/p>\n<p>     <\/span><span class=\"katex-html\"><span class=\"base\"><span class=\"strut\" style=\"height: 0.6833em\"><\/span><span class=\"mord mathnormal\" style=\"margin-right: 0.109em\">N<\/span><\/span><\/span><\/span><\/span> \u6216 <span class=\"katex--inline\"><span class=\"katex\"><span class=\"katex-mathml\"><\/p>\n<p>         N<\/p>\n<p>         &#043;<\/p>\n<p>         1<\/p>\n<p>        N&#043;1<\/p>\n<p>     <\/span><span class=\"katex-html\"><span class=\"base\"><span class=\"strut\" style=\"height: 0.7667em;vertical-align: -0.0833em\"><\/span><span class=\"mord mathnormal\" style=\"margin-right: 0.109em\">N<\/span><span class=\"mspace\" style=\"margin-right: 0.2222em\"><\/span><span class=\"mbin\">&#043;<\/span><span class=\"mspace\" style=\"margin-right: 0.2222em\"><\/span><\/span><span class=\"base\"><span class=\"strut\" style=\"height: 0.6444em\"><\/span><span class=\"mord\">1<\/span><\/span><\/span><\/span><\/span>&#xff09;\u3002<\/li>\n<\/ul>\n<h5>\u2461 maxPoolSize&#xff08;\u6700\u5927 Carrier \u7ebf\u7a0b\u4e0a\u9650&#xff09;<\/h5>\n<ul>\n<li>\u9ed8\u8ba4\u503c&#xff1a; 256\u3002<\/li>\n<li>\u8c03\u4f18\u7b56\u7565&#xff1a;<\/li>\n<li>maxPoolSize \u662f\u5f53\u53d1\u751f\u65e0\u6cd5 Unmount \u7684\u963b\u585e&#xff08;\u5982 Pinning \u6216 ManagedBlocker&#xff09;\u65f6&#xff0c;FJP \u5bb9\u5fcd\u521b\u5efa\u7684\u6700\u5927\u5e94\u6025\u8865\u507f\u7ebf\u7a0b\u6570\u3002<\/li>\n<li>\u5982\u679c\u4ee3\u7801\u5e93\u4e2d\u5b58\u5728\u65e0\u6cd5\u6d88\u9664\u7684\u963b\u585e&#xff08;\u5982\u65e7\u7248 JDBC \u9a71\u52a8\u3001\u6587\u4ef6 I\/O&#xff09;&#xff0c;\u5e94\u5f53\u9650\u5236 maxPoolSize&#xff08;\u5982\u8bbe\u4e3a 2 * parallelism \u6216 64&#xff09;&#xff0c;\u9632\u6b62\u5728\u5927\u4fc3\u6d41\u91cf\u4e0b JVM \u77ac\u95f4\u521b\u5efa\u6570\u767e\u4e2a\u5185\u6838\u7ebf\u7a0b\u5bfc\u81f4 OOM \u6216 CPU \u762b\u75ea\u3002<\/li>\n<\/ul>\n<h5>\u2462 minRunnable&#xff08;\u6700\u5c0f\u4fdd\u8bc1\u8fd0\u884c\u7ebf\u7a0b\u6570&#xff09;<\/h5>\n<ul>\n<li>\u9ed8\u8ba4\u503c&#xff1a; Math.max(1, parallelism \/ 2)\u3002<\/li>\n<li>\u8c03\u4f18\u7b56\u7565&#xff1a; \u5f53\u5927\u91cf Carrier Thread \u56e0\u8865\u507f\u673a\u5236\u5904\u4e8e\u6302\u8d77\u72b6\u6001\u65f6&#xff0c;\u4fdd\u8bc1\u6c60\u5185\u81f3\u5c11\u6709 minRunnable \u4e2a\u6d3b\u8dc3 Carrier \u5904\u4e8e\u53ef\u8fd0\u884c\u72b6\u6001\u3002\u5bf9\u4e8e\u4f4e\u5ef6\u8fdf\u654f\u611f\u578b\u5e94\u7528&#xff0c;\u53ef\u5c06\u5176\u8c03\u6574\u4e3a\u7b49\u4e8e parallelism\u3002<\/li>\n<\/ul>\n<hr \/>\n<h4>2. \u6df7\u5408\u573a\u666f\u67b6\u6784\u843d\u5730\u4e09\u5927\u539f\u5219&#xff08;\u8231\u58c1\u9694\u79bb\u4e0e\u9632 Pinning&#xff09;<\/h4>\n<h5>\u539f\u5219\u4e00&#xff1a;CPU \u5bc6\u96c6\u578b\u4efb\u52a1\u4e0e\u865a\u62df\u7ebf\u7a0b\u89e3\u8026&#xff08;\u8231\u58c1\u9694\u79bb Bulkheading&#xff09;<\/h5>\n<p>\u7edd\u5bf9\u4e0d\u8981\u5728\u865a\u62df\u7ebf\u7a0b\u4e2d\u76f4\u63a5\u8dd1\u8017\u65f6\u8d85\u8fc7 1ms \u7684\u7eaf CPU \u8ba1\u7b97\u903b\u8f91&#xff01; \u5fc5\u987b\u5c06 CPU \u5bc6\u96c6\u578b\u8ba1\u7b97\u5265\u79bb\u5230\u72ec\u7acb\u7684\u3001\u6709\u754c\u9650\u7684\u5e73\u53f0\u7ebf\u7a0b\u6c60&#xff08;Platform Thread Pool&#xff09;\u4e2d\u6267\u884c&#xff1a;<\/p>\n<p><span class=\"token keyword\">public<\/span> <span class=\"token keyword\">class<\/span> <span class=\"token class-name\">HybridWorkloadService<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token comment\">\/\/ \u4e13\u95e8\u7528\u4e8e CPU \u5bc6\u96c6\u578b\u4efb\u52a1&#xff08;\u5982\u590d\u6742\u52a0\u89e3\u5bc6\/\u56fe\u50cf\u5904\u7406&#xff09;\u7684\u5e73\u53f0\u7ebf\u7a0b\u6c60<\/span><br \/>\n    <span class=\"token keyword\">private<\/span> <span class=\"token keyword\">static<\/span> <span class=\"token keyword\">final<\/span> <span class=\"token class-name\">ExecutorService<\/span> <span class=\"token constant\">CPU_BOUND_EXECUTOR<\/span> <span class=\"token operator\">&#061;<\/span><br \/>\n        <span class=\"token class-name\">Executors<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">newFixedThreadPool<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">Runtime<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">getRuntime<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">availableProcessors<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">,<\/span><br \/>\n            <span class=\"token keyword\">new<\/span> <span class=\"token class-name\">ThreadFactoryBuilder<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">setNameFormat<\/span><span class=\"token punctuation\">(<\/span><span class=\"token string\">&#034;cpu-worker-%d&#034;<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">build<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>    <span class=\"token keyword\">public<\/span> <span class=\"token keyword\">void<\/span> <span class=\"token function\">handleRequest<\/span><span class=\"token punctuation\">(<\/span><span class=\"token class-name\">Request<\/span> req<span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n        <span class=\"token comment\">\/\/ 1. \u865a\u62df\u7ebf\u7a0b\u5904\u7406 I\/O (\u7f51\u7edc\u8bfb\u53d6)<\/span><br \/>\n        <span class=\"token class-name\">String<\/span> rawData <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">httpSubRequest<\/span><span class=\"token punctuation\">(<\/span>req<span class=\"token punctuation\">.<\/span><span class=\"token function\">getUrl<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>        <span class=\"token comment\">\/\/ 2. \u5c06 CPU \u5bc6\u96c6\u578b\u8ba1\u7b97\u5207\u51fa\u5230\u5e73\u53f0\u7ebf\u7a0b\u6c60&#xff0c;\u907f\u514d\u9501\u6b7b Carrier Thread<\/span><br \/>\n        <span class=\"token class-name\">CompletableFuture<\/span><span class=\"token generics\"><span class=\"token punctuation\">&lt;<\/span><span class=\"token class-name\">Result<\/span><span class=\"token punctuation\">&gt;<\/span><\/span> future <span class=\"token operator\">&#061;<\/span> <span class=\"token class-name\">CompletableFuture<\/span><span class=\"token punctuation\">.<\/span><span class=\"token function\">supplyAsync<\/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            <span class=\"token keyword\">return<\/span> <span class=\"token function\">heavyCpuCalculation<\/span><span class=\"token punctuation\">(<\/span>rawData<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token comment\">\/\/ \u8017\u65f6\u8ba1\u7b97<\/span><br \/>\n        <span class=\"token punctuation\">}<\/span><span class=\"token punctuation\">,<\/span> <span class=\"token constant\">CPU_BOUND_EXECUTOR<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><\/p>\n<p>        <span class=\"token comment\">\/\/ 3. \u865a\u62df\u7ebf\u7a0b\u65e0\u963b\u585e\u7b49\u5f85\u7ed3\u679c (Continuation.yield, \u91ca\u653e Carrier)<\/span><br \/>\n        <span class=\"token class-name\">Result<\/span> result <span class=\"token operator\">&#061;<\/span> future<span class=\"token punctuation\">.<\/span><span class=\"token function\">join<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span> <\/p>\n<p>        <span class=\"token comment\">\/\/ 4. \u865a\u62df\u7ebf\u7a0b\u7ee7\u7eed\u5904\u7406 I\/O (\u6570\u636e\u5e93\u5199\u5165)<\/span><br \/>\n        <span class=\"token function\">saveToDb<\/span><span class=\"token punctuation\">(<\/span>result<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token punctuation\">}<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<h5>\u539f\u5219\u4e8c&#xff1a;\u5f7b\u5e95\u6d88\u9664 Pinning&#xff08;\u8f7d\u4f53\u7ebf\u7a0b\u951a\u5b9a&#xff09;<\/h5>\n<p>\u5728 JVM \u542f\u52a8\u53c2\u6570\u4e2d\u52a0\u5165 -Djdk.tracePinnedThreads&#061;full\u3002\u5728\u65e5\u5fd7\u4e2d\u76d1\u63a7\u662f\u5426\u6709 pinned \u63d0\u793a\u3002<\/p>\n<ul>\n<li>\u75db\u70b9&#xff1a; \u865a\u62df\u7ebf\u7a0b\u5728 synchronized \u5757\u5185\u6267\u884c I\/O \u6216\u6302\u8d77\u65f6&#xff0c;\u4f1a\u5bfc\u81f4 Carrier \u88ab Pin \u4f4f\u3002<\/li>\n<li>\u91cd\u6784\u65b9\u6848&#xff1a; \u5168\u9762\u4f7f\u7528\u57fa\u4e8e AQS \u7684 ReentrantLock \u66ff\u6362 synchronized\u3002AQS \u5185\u90e8\u4f7f\u7528 LockSupport.park()&#xff0c;\u5728\u865a\u62df\u7ebf\u7a0b\u4e0b\u5b8c\u7f8e\u652f\u6301 Continuation.yield()&#xff0c;\u53ef\u4ee5 100% \u91ca\u653e Carrier Thread\u3002<\/li>\n<\/ul>\n<p><span class=\"token comment\">\/\/ \u274c \u6781\u5ea6\u5371\u9669&#xff1a;\u5728 synchronized \u5185\u90e8\u53d1\u8d77 blocking I\/O \u5bfc\u81f4 Carrier Thread Pinning<\/span><br \/>\n<span class=\"token keyword\">public<\/span> <span class=\"token keyword\">synchronized<\/span> <span class=\"token class-name\">String<\/span> <span class=\"token function\">badRead<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token keyword\">return<\/span> restTemplate<span class=\"token punctuation\">.<\/span><span class=\"token function\">getForObject<\/span><span class=\"token punctuation\">(<\/span>url<span class=\"token punctuation\">,<\/span> <span class=\"token class-name\">String<\/span><span class=\"token punctuation\">.<\/span><span class=\"token keyword\">class<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<p><span class=\"token comment\">\/\/ \u2705 \u6b63\u786e\u5199\u6cd5&#xff1a;\u4f7f\u7528 ReentrantLock (\u57fa\u4e8e AQS)&#xff0c;\u65e0 Pinning \u98ce\u9669<\/span><br 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