{"id":57695,"date":"2025-03-04T20:33:16","date_gmt":"2025-03-04T12:33:16","guid":{"rendered":"https:\/\/fwq.ai\/blog\/?p=57695"},"modified":"2025-03-04T20:33:16","modified_gmt":"2025-03-04T12:33:16","slug":"%e9%ab%98%e6%80%a7%e8%83%bdlinux%e7%bc%96%e7%a8%8b%ef%bc%9a%e6%97%b6%e9%97%b4%e8%bd%ae%e7%ae%97%e6%b3%95%e5%9c%a8%e7%be%8e%e5%9b%bd%e6%9c%8d%e5%8a%a1%e5%99%a8%e4%b8%ad%e7%9a%84%e5%ba%94%e7%94%a8","status":"publish","type":"post","link":"https:\/\/fwq.ai\/blog\/57695\/","title":{"rendered":"\u9ad8\u6027\u80fdLinux\u7f16\u7a0b\uff1a\u65f6\u95f4\u8f6e\u7b97\u6cd5\u5728\u7f8e\u56fd\u670d\u52a1\u5668\u4e2d\u7684\u5e94\u7528"},"content":{"rendered":"<p>\u5728\u9ad8\u5e76\u53d1\u3001\u9ad8\u541e\u5410\u7684\u7cfb\u7edf\u4e2d\uff0c\u9ad8\u6548\u7684\u5b9a\u65f6\u4efb\u52a1\u8c03\u5ea6\u662f\u5fc5\u4e0d\u53ef\u5c11\u7684\u3002\u65f6\u95f4\u8f6e\uff08Timing Wheel\uff09\u662f\u4e00\u79cd\u7ecf\u5178\u7684\u9ad8\u6548\u5b9a\u65f6\u4efb\u52a1\u7ba1\u7406\u673a\u5236\uff0c\u88ab\u5e7f\u6cdb\u5e94\u7528\u4e8eKafka\u3001Skynet\u3001Linux\u5185\u6838\u7b49\u8457\u540d\u5f00\u6e90\u9879\u76ee\u4e2d\u3002\u5c24\u5176\u5728\u9700\u8981\u4f18\u5316\u7f8e\u56fd\u670d\u52a1\u5668\u7684\u6027\u80fd\u65f6\uff0c\u65f6\u95f4\u8f6e\u53ef\u4ee5\u5e2e\u52a9\u964d\u4f4e\u5b9a\u65f6\u4efb\u52a1\u7ba1\u7406\u7684\u590d\u6742\u5ea6\uff0c\u63d0\u9ad8\u7cfb\u7edf\u54cd\u5e94\u901f\u5ea6\u3002<\/p>\n<h2>1. \u521d\u8bc6\u65f6\u95f4\u8f6e<\/h2>\n<p>\u65f6\u95f4\u8f6e\u672c\u8d28\u4e0a\u662f\u4e00\u4e2a\u73af\u5f62\u961f\u5217\uff0c\u5e95\u5c42\u7531\u6570\u7ec4\u5b9e\u73b0\uff0c\u6570\u7ec4\u7684\u6bcf\u4e2a\u5143\u7d20\u90fd\u662f\u4e00\u4e2a\u94fe\u8868\uff0c\u5b58\u50a8\u7740\u591a\u4e2a\u5b9a\u65f6\u4efb\u52a1\u3002<\/p>\n<h3>1.1 \u5b9a\u65f6\u4efb\u52a1\u7684\u5206\u7c7b<\/h3>\n<p>\u5b9a\u65f6\u4efb\u52a1\u53ef\u5206\u4e3a\u4ee5\u4e0b\u51e0\u79cd\uff1a<\/p>\n<ul>\n<li><strong>\u5ef6\u65f6\u4efb\u52a1<\/strong>\uff1a\u4efb\u52a1\u5728\u7279\u5b9a\u65f6\u95f4\u70b9\u6267\u884c\u3002<\/li>\n<li><strong>\u5468\u671f\u6027\u4efb\u52a1<\/strong>\uff1a\u4efb\u52a1\u6309\u7167\u56fa\u5b9a\u95f4\u9694\u91cd\u590d\u6267\u884c\u3002<\/li>\n<\/ul>\n<h3>1.2 \u65f6\u95f4\u8f6e\u7684\u5e38\u89c1\u5e94\u7528<\/h3>\n<p>\u65f6\u95f4\u8f6e\u5e7f\u6cdb\u7528\u4e8e\u5404\u79cd\u9700\u8981\u5b9a\u65f6\u6267\u884c\u7684\u529f\u80fd\u573a\u666f\uff0c\u4f8b\u5982\uff1a<\/p>\n<ul>\n<li><strong>\u5fc3\u8df3\u68c0\u6d4b<\/strong>\uff1a\u5728\u5206\u5e03\u5f0f\u7cfb\u7edf\u4e2d\uff0c\u65f6\u95f4\u8f6e\u7528\u4e8e\u68c0\u6d4b\u8282\u70b9\u5b58\u6d3b\u72b6\u6001\u3002<\/li>\n<li><strong>\u5468\u671f\u6027\u6570\u636e\u540c\u6b65<\/strong>\uff1a\u5982\u670d\u52a1\u5668\u95f4\u72b6\u6001\u540c\u6b65\uff0c\u63d0\u9ad8\u7cfb\u7edf\u4e00\u81f4\u6027\u3002<\/li>\n<li><strong>\u8d85\u65f6\u63a7\u5236<\/strong>\uff1a\u5982\u7f51\u7edc\u8bf7\u6c42\u8d85\u65f6\u3001\u4efb\u52a1\u6267\u884c\u8d85\u65f6\u7b49\u3002<\/li>\n<li><strong>\u901a\u77e5\u673a\u5236<\/strong>\uff1a\u5b9a\u671f\u89e6\u53d1\u901a\u77e5\uff0c\u63d0\u9ad8\u4e8b\u4ef6\u9a71\u52a8\u7cfb\u7edf\u7684\u6548\u7387\u3002<\/li>\n<\/ul>\n<p>\u7279\u522b\u662f\u5728\u7f8e\u56fd\u670d\u52a1\u5668\u7684\u5927\u89c4\u6a21\u90e8\u7f72\u4e2d\uff0c\u65f6\u95f4\u8f6e\u53ef\u4ee5\u51cf\u5c11\u9ad8\u5e76\u53d1\u73af\u5883\u4e0b\u7684CPU\u548c\u5185\u5b58\u5f00\u9500\uff0c\u63d0\u9ad8\u7cfb\u7edf\u541e\u5410\u80fd\u529b\u3002<\/p>\n<h2>2. \u65f6\u95f4\u8f6e\u5b9e\u73b0\u539f\u7406<\/h2>\n<h3>2.1 \u65f6\u95f4\u8f6e\u7684\u6838\u5fc3\u7ec4\u4ef6<\/h3>\n<p>\u65f6\u95f4\u8f6e\u4e3b\u8981\u7531\u4ee5\u4e0b\u56db\u4e2a\u6838\u5fc3\u7ec4\u4ef6\u6784\u6210\uff1a<\/p>\n<ol>\n<li><strong>\u65f6\u95f4\u8f6e\u76d8\uff08Timing Wheel\uff09<\/strong>\n<ul>\n<li>\u7531\u56fa\u5b9a\u6570\u91cf\u7684\u69fd\u4f4d\uff08wheelSize\uff09\u7ec4\u6210\uff0c\u6bcf\u4e2a\u69fd\u4f4d\u5bf9\u5e94\u4e00\u4e2a\u65f6\u95f4\u8de8\u5ea6\uff08tickMS\uff09\u3002<\/li>\n<li>\u65f6\u95f4\u8f6e\u7684\u6700\u5927\u5b9a\u65f6\u65f6\u95f4\u4e0d\u80fd\u8d85\u8fc7\u6700\u9ad8\u5c42\u7ea7\u7684\u65f6\u95f4\u8de8\u5ea6\u3002<\/li>\n<li>\u4efb\u52a1\u5b58\u653e\u5728\u5bf9\u5e94\u69fd\u4f4d\u7684\u94fe\u8868\u4e2d\uff0c\u7b49\u5f85\u65f6\u95f4\u5230\u8fbe\u540e\u6267\u884c\u3002<\/li>\n<\/ul>\n<\/li>\n<li><strong>\u65f6\u95f4\u6307\u9488\uff08Time Pointer\uff09<\/strong>\n<ul>\n<li>\u6307\u5411\u5f53\u524d\u65f6\u95f4\u6240\u5728\u7684\u69fd\u4f4d\uff0c\u6bcf\u6b21\u79fb\u52a8\u4e00\u4e2a\u69fd\u4f4d\u3002<\/li>\n<li>\u4f4e\u7ea7\u65f6\u95f4\u8f6e\u8f6c\u5b8c\u4e00\u5708\u540e\uff0c\u4f1a\u63a8\u52a8\u66f4\u9ad8\u7ea7\u65f6\u95f4\u8f6e\u7684\u6307\u9488\u3002<\/li>\n<\/ul>\n<\/li>\n<li><strong>\u5b9a\u65f6\u4efb\u52a1\uff08Timer Task\uff09<\/strong>\n<ul>\n<li>\u4ee5\u94fe\u8868\u5f62\u5f0f\u5b58\u50a8\u5728\u69fd\u4f4d\u4e2d\u3002<\/li>\n<li>\u4efb\u52a1\u5177\u6709\u5230\u671f\u65f6\u95f4\u3001\u5468\u671f\u65f6\u95f4\u548c\u56de\u8c03\u51fd\u6570\u3002<\/li>\n<\/ul>\n<\/li>\n<li><strong>\u65f6\u95f4\u9a71\u52a8\u5668\uff08Time Driver\uff09<\/strong>\n<ul>\n<li>\u8d1f\u8d23\u63a8\u8fdb\u65f6\u95f4\u8f6e\u7684\u8fd0\u884c\uff0c\u901a\u5e38\u7531\u72ec\u7acb\u7ebf\u7a0b\u9a71\u52a8\u3002<\/li>\n<li>\u53ef\u91c7\u7528 <code>sleep<\/code> \u6216 <code>epoll<\/code> \u65b9\u5f0f\u5b9e\u73b0\u3002<\/li>\n<\/ul>\n<\/li>\n<\/ol>\n<h3>2.2 \u7ec4\u4ef6\u8bbe\u8ba1\u4e0e\u5b9e\u73b0<\/h3>\n<h4>2.2.1 \u65f6\u95f4\u8f6e\u76d8\u8bbe\u8ba1<\/h4>\n<pre><code class=\"language-c\">struct tw {\r\n    uint32_t tick_ms; \/\/ \u6700\u5c0f\u65f6\u95f4\u8de8\u5ea6\r\n    uint32_t cur_tick; \/\/ \u5f53\u524d\u65f6\u95f4\r\n    struct link slots[TW_LEVEL][TW_SIZE]; \/\/ \u69fd\u4f4d\u5b58\u50a8\u4efb\u52a1\r\n    pthread_spinlock_t lock; \/\/ \u7ebf\u7a0b\u5b89\u5168\u63a7\u5236\r\n};\r\n<\/code><\/pre>\n<h4>2.2.2 \u65f6\u95f4\u6307\u9488\u8bbe\u8ba1<\/h4>\n<pre><code class=\"language-c\">#define TW_BITS (8)\r\n#define TW_SIZE (1 &lt;&lt; TW_BITS) \/\/ \u5355\u7ea7\u65f6\u95f4\u8f6e\u5927\u5c0f\r\n#define TW_MASK (TW_SIZE - 1)\r\n\r\n#define IDX0(data) data &amp; TW_MASK; \/\/ \u4e00\u7ea7\u6307\u9488\r\n#define IDX1(data) (data &gt;&gt; TW_BITS) &amp; TW_MASK; \/\/ \u4e8c\u7ea7\u6307\u9488\r\n#define IDX2(data) (data &gt;&gt; (2 * TW_BITS)) &amp; TW_MASK; \/\/ \u4e09\u7ea7\u6307\u9488\r\n<\/code><\/pre>\n<h4>2.2.3 \u5b9a\u65f6\u4efb\u52a1\u8bbe\u8ba1<\/h4>\n<pre><code class=\"language-c\">typedef void (*func)(void *arg);\r\nstruct tw_node {\r\n    struct link link;\r\n    int32_t expire_tick;\r\n    int32_t period_ticks;\r\n    int flags;\r\n    func cb;\r\n    void *arg;\r\n};\r\n<\/code><\/pre>\n<ul>\n<li><code>expire_tick<\/code>\uff1a\u4efb\u52a1\u7684\u5230\u671f\u65f6\u95f4\u3002<\/li>\n<li><code>period_ticks<\/code>\uff1a\u5468\u671f\u6027\u4efb\u52a1\u7684\u95f4\u9694\u65f6\u95f4\u3002<\/li>\n<li><code>flags<\/code>\uff1a\u6807\u8bc6\u4efb\u52a1\u7c7b\u578b\uff08\u4e00\u6b21\u6027\u4efb\u52a1\u6216\u5468\u671f\u4efb\u52a1\uff09\u3002<\/li>\n<\/ul>\n<h4>2.2.4 \u65f6\u95f4\u9a71\u52a8\u5668\u8bbe\u8ba1<\/h4>\n<ul>\n<li><strong>\u65b9\u6cd51\uff1a<code>sleep<\/code> \u65b9\u5f0f<\/strong><\/li>\n<\/ul>\n<pre><code class=\"language-c\">void *tw_driver_thread(void *arg) {\r\n    struct tw *tw = (struct tw *)arg;\r\n    while(1) {\r\n        usleep(TICK_MS * 1000);\r\n        tw_update(tw);\r\n    }\r\n}\r\n<\/code><\/pre>\n<ul>\n<li><strong>\u65b9\u6cd52\uff1a<code>epoll<\/code> \u65b9\u5f0f<\/strong><\/li>\n<\/ul>\n<pre><code class=\"language-c\">void *tw_driver_thread(void *arg) {\r\n    struct tw *tw = (struct tw *)arg;\r\n    int efd = epoll_create(1024);\r\n    struct epoll_event ev, events[MAX_EVENTS];\r\n    while(1) {\r\n        int nfds = epoll_wait(efd, events, MAX_EVENTS, TICK_MS);\r\n        tw_update(tw);\r\n    }\r\n}\r\n<\/code><\/pre>\n<p>\u5728\u7f8e\u56fd\u670d\u52a1\u5668\u7684\u9ad8\u5e76\u53d1\u73af\u5883\u4e0b\uff0c<code>epoll<\/code> \u65b9\u5f0f\u66f4\u9002\u5408\u7528\u4e8eI\/O\u5bc6\u96c6\u578b\u4efb\u52a1\uff0c\u800c <code>sleep<\/code> \u65b9\u5f0f\u5219\u9002\u7528\u4e8e\u7b80\u5355\u7684\u5b9a\u65f6\u4efb\u52a1\u8c03\u5ea6\u3002<\/p>\n<h2>3. \u65f6\u95f4\u8f6e\u7684\u63a5\u53e3\u8bbe\u8ba1<\/h2>\n<pre><code class=\"language-c\">\/\/ 1. \u521d\u59cb\u5316\u65f6\u95f4\u8f6e\r\nvoid tw_init(struct tw *tw, uint32_t tick_ms);\r\n\/\/ 2. \u91ca\u653e\u65f6\u95f4\u8f6e\r\nvoid tw_free(struct tw *tw);\r\n\/\/ 3. \u6dfb\u52a0\u5b9a\u65f6\u4efb\u52a1\r\nvoid tw_add(struct tw *tw, struct tw_node *node, bool nolock);\r\n\/\/ 4. \u9a71\u52a8\u65f6\u95f4\u8f6e\r\nint tw_update(struct tw *tw);\r\n<\/code><\/pre>\n<h3>3.1 <code>tw_add<\/code> \u6dfb\u52a0\u5b9a\u65f6\u4efb\u52a1<\/h3>\n<ul>\n<li>\u8ba1\u7b97\u4efb\u52a1\u7684\u5230\u671f\u65f6\u95f4\u3002<\/li>\n<li>\u6839\u636e\u5230\u671f\u65f6\u95f4\u63d2\u5165\u76f8\u5e94\u5c42\u7ea7\u7684\u65f6\u95f4\u8f6e\u3002<\/li>\n<li>\u82e5\u4efb\u52a1\u662f\u5468\u671f\u6027\u4efb\u52a1\uff0c\u5219\u5728\u6267\u884c\u5b8c\u6bd5\u540e\u91cd\u65b0\u8ba1\u7b97\u5230\u671f\u65f6\u95f4\u5e76\u518d\u6b21\u63d2\u5165\u3002<\/li>\n<\/ul>\n<h3>3.2 <code>tw_update<\/code> \u9a71\u52a8\u65f6\u95f4\u8f6e<\/h3>\n<ul>\n<li>\u63a8\u8fdb\u65f6\u95f4\u6307\u9488\u3002<\/li>\n<li>\u904d\u5386\u5f53\u524d\u69fd\u4f4d\u7684\u4efb\u52a1\uff0c\u5224\u65ad\u662f\u5426\u5230\u671f\u6267\u884c\u3002<\/li>\n<li>\u82e5\u4efb\u52a1\u5c1a\u672a\u5230\u671f\uff0c\u5219\u91cd\u65b0\u6620\u5c04\u5230\u66f4\u9ad8\u7ea7\u7684\u65f6\u95f4\u8f6e\u3002<\/li>\n<\/ul>\n<h2>4. \u9002\u7528\u4e8e<a href=\"https:\/\/fwq.ai\/\">\u7f8e\u56fd\u670d\u52a1\u5668<\/a>\u7684\u4f18\u5316\u7b56\u7565<\/h2>\n<p>\u5728\u7f8e\u56fd\u670d\u52a1\u5668\u7684\u9ad8\u6027\u80fd\u5e94\u7528\u573a\u666f\u4e0b\uff0c\u53ef\u4ee5\u9488\u5bf9\u65f6\u95f4\u8f6e\u8fdb\u884c\u4f18\u5316\uff1a<\/p>\n<ul>\n<li><strong>\u8c03\u6574\u65f6\u95f4\u7cbe\u5ea6<\/strong>\uff1a\u6839\u636e\u4e1a\u52a1\u9700\u6c42\uff0c\u52a8\u6001\u8c03\u6574 <code>tick_ms<\/code> \u4ee5\u9002\u5e94\u4e0d\u540c\u7684\u4efb\u52a1\u8c03\u5ea6\u9891\u7387\u3002<\/li>\n<li><strong>\u4f7f\u7528 <code>epoll<\/code> \u65b9\u5f0f\u9a71\u52a8<\/strong>\uff1a\u9002\u7528\u4e8e\u5927\u89c4\u6a21 I\/O \u5904\u7406\uff0c\u63d0\u9ad8\u7cfb\u7edf\u541e\u5410\u91cf\u3002<\/li>\n<li><strong>\u591a\u7ea7\u65f6\u95f4\u8f6e\u8bbe\u8ba1<\/strong>\uff1a\u91c7\u7528\u4e09\u7ea7\u65f6\u95f4\u8f6e\u53ef\u4ee5\u51cf\u5c11\u69fd\u4f4d\u904d\u5386\u7684\u5f00\u9500\uff0c\u63d0\u9ad8\u67e5\u627e\u6548\u7387\u3002<\/li>\n<li><strong>\u4efb\u52a1\u8d1f\u8f7d\u5747\u8861<\/strong>\uff1a\u5728\u96c6\u7fa4\u73af\u5883\u4e0b\uff0c\u53ef\u7ed3\u5408 <code>Consistent Hashing<\/code> \u8fdb\u884c\u4efb\u52a1\u5206\u5e03\u3002<\/li>\n<\/ul>\n<h2>5. \u7ed3\u8bed<\/h2>\n<p>\u65f6\u95f4\u8f6e\u662f\u4e00\u79cd\u9ad8\u6548\u7684\u5b9a\u65f6\u4efb\u52a1\u7ba1\u7406\u673a\u5236\uff0c\u5728\u9ad8\u5e76\u53d1\u3001\u9ad8\u541e\u5410\u7684\u73af\u5883\u4e0b\u8868\u73b0\u5c24\u4e3a\u4f18\u8d8a\u3002\u5bf9\u4e8e\u90e8\u7f72\u5728\u7f8e\u56fd\u670d\u52a1\u5668\u7684\u5e94\u7528\uff0c\u4f18\u5316\u65f6\u95f4\u8f6e\u7684\u7ed3\u6784\u548c\u8c03\u5ea6\u65b9\u5f0f\uff0c\u80fd\u591f\u663e\u8457\u63d0\u5347\u670d\u52a1\u5668\u7684\u54cd\u5e94\u901f\u5ea6\u548c\u8d44\u6e90\u5229\u7528\u7387\u3002\u5e0c\u671b\u672c\u7bc7\u5185\u5bb9\u80fd\u591f\u5e2e\u52a9\u5927\u5bb6\u6df1\u5165\u7406\u89e3\u65f6\u95f4\u8f6e\u7684\u539f\u7406\uff0c\u5e76\u5728\u5b9e\u9645\u5f00\u53d1\u4e2d\u52a0\u4ee5\u5e94\u7528\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u5728\u9ad8\u5e76\u53d1\u3001\u9ad8\u541e\u5410\u7684\u7cfb\u7edf\u4e2d\uff0c\u9ad8\u6548\u7684\u5b9a\u65f6\u4efb\u52a1\u8c03\u5ea6\u662f\u5fc5\u4e0d\u53ef\u5c11\u7684\u3002\u65f6\u95f4\u8f6e\uff08Timing Wheel\uff09\u662f\u4e00\u79cd\u7ecf\u5178\u7684\u9ad8\u6548\u5b9a\u65f6\u4efb\u52a1\u7ba1\u7406\u673a\u5236\uff0c\u88ab\u5e7f\u6cdb\u5e94\u7528\u4e8eKafka\u3001Skynet\u3001Linux\u5185\u6838\u7b49\u8457\u540d\u5f00\u6e90\u9879\u76ee\u4e2d\u3002\u5c24\u5176\u5728\u9700\u8981\u4f18\u5316\u7f8e\u56fd\u670d\u52a1\u5668\u7684\u6027\u80fd\u65f6\uff0c\u65f6\u95f4\u8f6e\u53ef\u4ee5\u5e2e\u52a9\u964d\u4f4e\u5b9a\u65f6\u4efb\u52a1\u7ba1\u7406\u7684\u590d\u6742\u5ea6\uff0c\u63d0\u9ad8\u7cfb\u7edf\u54cd\u5e94\u901f\u5ea6\u3002 1. \u521d\u8bc6\u65f6\u95f4\u8f6e \u65f6\u95f4\u8f6e\u672c\u8d28\u4e0a\u662f\u4e00\u4e2a\u73af\u5f62\u961f\u5217\uff0c\u5e95\u5c42\u7531\u6570\u7ec4\u5b9e\u73b0\uff0c\u6570\u7ec4\u7684\u6bcf\u4e2a\u5143\u7d20\u90fd\u662f\u4e00\u4e2a\u94fe\u8868\uff0c\u5b58\u50a8\u7740\u591a\u4e2a\u5b9a\u65f6\u4efb\u52a1\u3002 1.1 \u5b9a\u65f6\u4efb\u52a1\u7684\u5206\u7c7b \u5b9a\u65f6\u4efb\u52a1\u53ef\u5206\u4e3a\u4ee5\u4e0b\u51e0\u79cd\uff1a 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\u901a\u77e5\u673a\u5236\uff1a\u5b9a\u671f\u89e6\u53d1\u901a\u77e5\uff0c\u63d0\u9ad8\u4e8b\u4ef6\u9a71\u52a8\u7cfb\u7edf\u7684\u6548\u7387\u3002 \u7279\u522b\u662f\u5728\u7f8e\u56fd\u670d\u52a1\u5668\u7684\u5927\u89c4\u6a21\u90e8\u7f72\u4e2d\uff0c\u65f6\u95f4\u8f6e\u53ef\u4ee5\u51cf\u5c11\u9ad8\u5e76\u53d1\u73af\u5883\u4e0b\u7684CPU\u548c\u5185\u5b58\u5f00\u9500\uff0c\u63d0\u9ad8\u7cfb\u7edf\u541e\u5410\u80fd\u529b\u3002 2. \u65f6\u95f4\u8f6e\u5b9e\u73b0\u539f\u7406 2.1 \u65f6\u95f4\u8f6e\u7684\u6838\u5fc3\u7ec4\u4ef6 \u65f6\u95f4\u8f6e\u4e3b\u8981\u7531\u4ee5\u4e0b\u56db\u4e2a\u6838\u5fc3\u7ec4\u4ef6\u6784\u6210\uff1a \u65f6\u95f4\u8f6e\u76d8\uff08Timing Wheel\uff09 \u7531\u56fa\u5b9a\u6570\u91cf\u7684\u69fd\u4f4d\uff08wheelSize\uff09\u7ec4\u6210\uff0c\u6bcf\u4e2a\u69fd\u4f4d\u5bf9\u5e94\u4e00\u4e2a\u65f6\u95f4\u8de8\u5ea6\uff08tickMS\uff09\u3002 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