Nginx \u662f\u4ee5 event\uff08\u4e8b\u4ef6\uff09\u5904\u7406\u6a21\u578b\u4e3a\u57fa\u7840\u7684\u6a21\u5757\u3002\u5b83\u4e3a\u4e86\u652f\u6301\u8de8\u5e73\u53f0\uff0c\u62bd\u8c61\u51fa\u4e86 event \u6a21\u5757\u3002\u5b83\u652f\u6301\u7684 event \u5904\u7406\u7c7b\u578b\u6709\uff1aAIO\uff08\u5f02\u6b65IO\uff09\uff0c\/dev\/poll\uff08Solaris \u548c Unix \u7279\u6709\uff09\uff0cepoll\uff08Linux \u7279\u6709\uff09\uff0ceventport\uff08Solaris 10 \u7279\u6709\uff09\uff0ckqueue\uff08BSD \u7279\u6709\uff09\uff0cpoll\uff0crtsig\uff08\u5b9e\u65f6\u4fe1\u53f7\uff09\uff0cselect \u7b49\u3002<\/p>\n
event \u6a21\u5757\u7684\u4e3b\u8981\u529f\u80fd\u5c31\u662f\uff0c\u76d1\u542c accept \u540e\u5efa\u7acb\u7684\u8fde\u63a5\uff0c\u5bf9\u8bfb\u5199\u4e8b\u4ef6\u8fdb\u884c\u6dfb\u52a0\u5220\u9664\u3002\u4e8b\u4ef6\u5904\u7406\u6a21\u578b\u548c Nginx \u7684\u975e\u963b\u585e IO \u6a21\u578b\u7ed3\u5408\u5728\u4e00\u8d77\u4f7f\u7528\u3002\u5f53 IO \u53ef\u8bfb\u53ef\u5199\u7684\u65f6\u5019\uff0c\u76f8\u5e94\u7684\u8bfb\u5199\u4e8b\u4ef6\u5c31\u4f1a\u88ab\u5524\u9192\uff0c\u6b64\u65f6\u5c31\u4f1a\u53bb\u5904\u7406\u4e8b\u4ef6\u7684\u56de\u8c03\u51fd\u6570\u3002<\/p>\n
\u7279\u522b\u5bf9\u4e8e Linux\uff0cNginx \u5927\u90e8\u5206 event \u91c7\u7528 epoll EPOLLET\uff08\u8fb9\u6cbf\u89e6\u53d1\uff09\u7684\u65b9\u6cd5\u6765\u89e6\u53d1\u4e8b\u4ef6\uff0c\u53ea\u6709 listen \u7aef\u53e3\u7684\u8bfb\u4e8b\u4ef6\u662f EPOLLLT\uff08\u6c34\u5e73\u89e6\u53d1\uff09\u3002\u5bf9\u4e8e\u8fb9\u6cbf\u89e6\u53d1\uff0c\u5982\u679c\u51fa\u73b0\u4e86\u53ef\u8bfb\u4e8b\u4ef6\uff0c\u5fc5\u987b\u53ca\u65f6\u5904\u7406\uff0c\u5426\u5219\u53ef\u80fd\u4f1a\u51fa\u73b0\u8bfb\u4e8b\u4ef6\u4e0d\u518d\u89e6\u53d1\uff0c\u8fde\u63a5\u997f\u6b7b\u7684\u60c5\u51b5\u3002<\/p>\n
typedef struct {\n \/* \u6dfb\u52a0\u5220\u9664\u4e8b\u4ef6 *\/\n ngx_int_t (*add)(ngx_event_t *ev, ngx_int_t event, ngx_uint_t flags);\n ngx_int_t (*del)(ngx_event_t *ev, ngx_int_t event, ngx_uint_t flags);\n\n ngx_int_t (*enable)(ngx_event_t *ev, ngx_int_t event, ngx_uint_t flags);\n ngx_int_t (*disable)(ngx_event_t *ev, ngx_int_t event, ngx_uint_t flags);\n\n \/* \u6dfb\u52a0\u5220\u9664\u8fde\u63a5\uff0c\u4f1a\u540c\u65f6\u76d1\u542c\u8bfb\u5199\u4e8b\u4ef6 *\/\n ngx_int_t (*add_conn)(ngx_connection_t *c);\n ngx_int_t (*del_conn)(ngx_connection_t *c, ngx_uint_t flags);\n\n ngx_int_t (*process_changes)(ngx_cycle_t *cycle, ngx_uint_t nowait);\n \/* \u5904\u7406\u4e8b\u4ef6\u7684\u51fd\u6570 *\/\n ngx_int_t (*process_events)(ngx_cycle_t *cycle, ngx_msec_t timer,\n ngx_uint_t flags);\n\n ngx_int_t (*init)(ngx_cycle_t *cycle, ngx_msec_t timer);\n void (*done)(ngx_cycle_t *cycle);\n} ngx_event_actions_t;<\/code><\/pre>\n\u4e0a\u8ff0\u662f event \u5904\u7406\u62bd\u8c61\u51fa\u6765\u7684\u5173\u952e\u7ed3\u6784\u4f53\uff0c\u53ef\u4ee5\u770b\u5230\uff0c\u6bcf\u4e2a event \u5904\u7406\u6a21\u578b\uff0c\u90fd\u9700\u8981\u5b9e\u73b0\u90e8\u5206\u529f\u80fd\u3002\u6700\u5173\u952e\u7684\u662f add \u548c del \u529f\u80fd\uff0c\u5c31\u662f\u6700\u57fa\u672c\u7684\u6dfb\u52a0\u548c\u5220\u9664\u4e8b\u4ef6\u7684\u51fd\u6570\u3002<\/p>\n
accept \u9501<\/h2>\n
Nginx \u662f\u591a\u8fdb\u7a0b\u7a0b\u5e8f\uff0c80 \u7aef\u53e3\u662f\u5404\u8fdb\u7a0b\u6240\u5171\u4eab\u7684\uff0c\u591a\u8fdb\u7a0b\u540c\u65f6 listen 80 \u7aef\u53e3\uff0c\u52bf\u5fc5\u4f1a\u4ea7\u751f\u7ade\u4e89\uff0c\u4e5f\u4ea7\u751f\u4e86\u6240\u8c13\u7684\u201c\u60ca\u7fa4\u201d\u6548\u5e94\u3002\u5f53\u5185\u6838 accept \u4e00\u4e2a\u8fde\u63a5\u65f6\uff0c\u4f1a\u5524\u9192\u6240\u6709\u7b49\u5f85\u4e2d\u7684\u8fdb\u7a0b\uff0c\u4f46\u5b9e\u9645\u4e0a\u53ea\u6709\u4e00\u4e2a\u8fdb\u7a0b\u80fd\u83b7\u53d6\u8fde\u63a5\uff0c\u5176\u4ed6\u7684\u8fdb\u7a0b\u90fd\u662f\u88ab\u65e0\u6548\u5524\u9192\u7684\u3002\u6240\u4ee5 Nginx \u91c7\u7528\u4e86\u81ea\u6709\u7684\u4e00\u5957 accept \u52a0\u9501\u673a\u5236\uff0c\u907f\u514d\u591a\u4e2a\u8fdb\u7a0b\u540c\u65f6\u8c03\u7528 accept\u3002Nginx \u591a\u8fdb\u7a0b\u7684\u9501\u5728\u5e95\u5c42\u9ed8\u8ba4\u662f\u901a\u8fc7 CPU \u81ea\u65cb\u9501\u6765\u5b9e\u73b0\u3002\u5982\u679c\u64cd\u4f5c\u7cfb\u7edf\u4e0d\u652f\u6301\u81ea\u65cb\u9501\uff0c\u5c31\u91c7\u7528\u6587\u4ef6\u9501\u3002<\/p>\n
Nginx \u4e8b\u4ef6\u5904\u7406\u7684\u5165\u53e3\u51fd\u6570\u662f ngx_process_events_and_timers()\uff0c\u4e0b\u9762\u662f\u90e8\u5206\u4ee3\u7801\uff0c\u53ef\u4ee5\u770b\u5230\u5176\u52a0\u9501\u7684\u8fc7\u7a0b\uff1a<\/p>\n
if (ngx_use_accept_mutex) {\n if (ngx_accept_disabled > 0) {\n ngx_accept_disabled--;\n\n } else {\n if (ngx_trylock_accept_mutex(cycle) == NGX_ERROR) {\n return;\n }\n\n if (ngx_accept_mutex_held) {\n flags |= NGX_POST_EVENTS;\n\n } else {\n if (timer == NGX_TIMER_INFINITE\n || timer > ngx_accept_mutex_delay)\n {\n timer = ngx_accept_mutex_delay;\n }\n }\n }\n}<\/code><\/pre>\n\u5728 ngx_trylock_accept_mutex()\u51fd\u6570\u91cc\u9762\uff0c\u5982\u679c\u62ff\u5230\u4e86\u9501\uff0cNginx \u4f1a\u628a listen \u7684\u7aef\u53e3\u8bfb\u4e8b\u4ef6\u52a0\u5165 event \u5904\u7406\uff0c\u8be5\u8fdb\u7a0b\u5728\u6709\u65b0\u8fde\u63a5\u8fdb\u6765\u65f6\u5c31\u53ef\u4ee5\u8fdb\u884c accept \u4e86\u3002\u6ce8\u610f accept \u64cd\u4f5c\u662f\u4e00\u4e2a\u666e\u901a\u7684\u8bfb\u4e8b\u4ef6\u3002\u4e0b\u9762\u7684\u4ee3\u7801\u8bf4\u660e\u4e86\u8fd9\u70b9\uff1a<\/p>\n
(void) ngx_process_events(cycle, timer, flags);\n\nif (ngx_posted_accept_events) {\n ngx_event_process_posted(cycle, &ngx_posted_accept_events);\n}\n\nif (ngx_accept_mutex_held) {\n ngx_shmtx_unlock(&ngx_accept_mutex);\n}<\/code><\/pre>\nngx_process_events()\u51fd\u6570\u662f\u6240\u6709\u4e8b\u4ef6\u5904\u7406\u7684\u5165\u53e3\uff0c\u5b83\u4f1a\u904d\u5386\u6240\u6709\u7684\u4e8b\u4ef6\u3002\u62a2\u5230\u4e86 accept \u9501\u7684\u8fdb\u7a0b\u8ddf\u4e00\u822c\u8fdb\u7a0b\u7a0d\u5fae\u4e0d\u540c\u7684\u662f\uff0c\u5b83\u88ab\u52a0\u4e0a\u4e86 NGX_POST_EVENTS \u6807\u5fd7\uff0c\u4e5f\u5c31\u662f\u8bf4\u5728 ngx_process_events() \u51fd\u6570\u91cc\u9762\u53ea\u63a5\u53d7\u800c\u4e0d\u5904\u7406\u4e8b\u4ef6\uff0c\u5e76\u52a0\u5165 post_events \u7684\u961f\u5217\u91cc\u9762\u3002\u76f4\u5230 ngx_accept_mutex \u9501\u53bb\u6389\u4ee5\u540e\u624d\u53bb\u5904\u7406\u5177\u4f53\u7684\u4e8b\u4ef6\u3002\u4e3a\u4ec0\u4e48\u8fd9\u6837\uff1f\u56e0\u4e3a ngx_accept_mutex \u662f\u5168\u5c40\u9501\uff0c\u8fd9\u6837\u505a\u53ef\u4ee5\u5c3d\u91cf\u51cf\u5c11\u8be5\u8fdb\u7a0b\u62a2\u5230\u9501\u4ee5\u540e\uff0c\u4ece accept \u5f00\u59cb\u5230\u7ed3\u675f\u7684\u65f6\u95f4\uff0c\u4ee5\u4fbf\u5176\u4ed6\u8fdb\u7a0b\u7ee7\u7eed\u63a5\u6536\u65b0\u7684\u8fde\u63a5\uff0c\u63d0\u9ad8\u541e\u5410\u91cf\u3002<\/p>\n
ngx_posted_accept_events \u548c ngx_posted_events \u5c31\u5206\u522b\u662f accept \u5ef6\u8fdf\u4e8b\u4ef6\u961f\u5217\u548c\u666e\u901a\u5ef6\u8fdf\u4e8b\u4ef6\u961f\u5217\u3002\u53ef\u4ee5\u770b\u5230 ngx_posted_accept_events \u8fd8\u662f\u653e\u5230 ngx_accept_mutex \u9501\u91cc\u9762\u5904\u7406\u7684\u3002\u8be5\u961f\u5217\u91cc\u9762\u5904\u7406\u7684\u90fd\u662f accept \u4e8b\u4ef6\uff0c\u5b83\u4f1a\u4e00\u53e3\u6c14\u628a\u5185\u6838 backlog \u91cc\u7b49\u5f85\u7684\u8fde\u63a5\u90fd accept \u8fdb\u6765\uff0c\u6ce8\u518c\u5230\u8bfb\u5199\u4e8b\u4ef6\u91cc\u3002<\/p>\n
\u800c ngx_posted_events \u662f\u666e\u901a\u7684\u5ef6\u8fdf\u4e8b\u4ef6\u961f\u5217\u3002\u4e00\u822c\u60c5\u51b5\u4e0b\uff0c\u4ec0\u4e48\u6837\u7684\u4e8b\u4ef6\u4f1a\u653e\u5230\u8fd9\u4e2a\u666e\u901a\u5ef6\u8fdf\u961f\u5217\u91cc\u9762\u5462\uff1f\u6211\u7684\u7406\u89e3\u662f\uff0c\u90a3\u4e9b CPU \u8017\u65f6\u6bd4\u8f83\u591a\u7684\u90fd\u53ef\u4ee5\u653e\u8fdb\u53bb\u3002\u56e0\u4e3a Nginx \u4e8b\u4ef6\u5904\u7406\u90fd\u662f\u6839\u636e\u89e6\u53d1\u987a\u5e8f\u5728\u4e00\u4e2a\u5927\u5faa\u73af\u91cc\u4f9d\u6b21\u5904\u7406\u7684\uff0c\u56e0\u4e3a Nginx \u4e00\u4e2a\u8fdb\u7a0b\u540c\u65f6\u53ea\u80fd\u5904\u7406\u4e00\u4e2a\u4e8b\u4ef6\uff0c\u6240\u4ee5\u6709\u4e9b\u8017\u65f6\u591a\u7684\u4e8b\u4ef6\u4f1a\u628a\u540e\u9762\u6240\u6709\u4e8b\u4ef6\u7684\u5904\u7406\u90fd\u803d\u6401\u4e86\u3002<\/p>\n
\u9664\u4e86\u52a0\u9501\uff0cNginx \u4e5f\u5bf9\u5404\u8fdb\u7a0b\u7684\u8bf7\u6c42\u5904\u7406\u7684\u5747\u8861\u6027\u4f5c\u4e86\u4f18\u5316\uff0c\u4e5f\u5c31\u662f\u8bf4\uff0c\u5982\u679c\u5728\u8d1f\u8f7d\u9ad8\u7684\u65f6\u5019\uff0c\u8fdb\u7a0b\u62a2\u5230\u7684\u9501\u8fc7\u591a\uff0c\u4f1a\u5bfc\u81f4\u8fd9\u4e2a\u8fdb\u7a0b\u88ab\u7981\u6b62\u63a5\u53d7\u8bf7\u6c42\u4e00\u6bb5\u65f6\u95f4\u3002<\/p>\n
\u6bd4\u5982\uff0c\u5728 ngx_event_accept \u51fd\u6570\u4e2d\uff0c\u6709\u7c7b\u4f3c\u4ee3\u7801\uff1a<\/p>\n
ngx_accept_disabled = ngx_cycle->connection_n \/ 8\n - ngx_cycle->free_connection_n;<\/code><\/pre>\nngx_cycle->connection_n \u662f\u8fdb\u7a0b\u53ef\u4ee5\u5206\u914d\u7684\u8fde\u63a5\u603b\u6570\uff0cngx_cycle->free_connection_n \u662f\u7a7a\u95f2\u7684\u8fdb\u7a0b\u6570\u3002\u4e0a\u8ff0\u7b49\u5f0f\u8bf4\u660e\u4e86\uff0c\u5f53\u524d\u8fdb\u7a0b\u7684\u7a7a\u95f2\u8fdb\u7a0b\u6570\u5c0f\u4e8e 1\/8 \u7684\u8bdd\uff0c\u5c31\u4f1a\u88ab\u7981\u6b62 accept \u4e00\u6bb5\u65f6\u95f4\u3002<\/p>\n
\u5b9a\u65f6\u5668<\/h2>\n
Nginx \u5728\u9700\u8981\u7528\u5230\u8d85\u65f6\u7684\u65f6\u5019\uff0c\u90fd\u4f1a\u7528\u5230\u5b9a\u65f6\u5668\u673a\u5236\u3002\u6bd4\u5982\uff0c\u5efa\u7acb\u8fde\u63a5\u4ee5\u540e\u7684\u90a3\u4e9b\u8bfb\u5199\u8d85\u65f6\u3002Nginx \u4f7f\u7528\u7ea2\u9ed1\u6811\u6765\u6784\u9020\u5b9a\u671f\u5668\uff0c\u7ea2\u9ed1\u6811\u662f\u4e00\u79cd\u6709\u5e8f\u7684\u4e8c\u53c9\u5e73\u8861\u6811\uff0c\u5176\u67e5\u627e\u63d2\u5165\u548c\u5220\u9664\u7684\u590d\u6742\u5ea6\u90fd\u4e3a O(logn)\uff0c\u6240\u4ee5\u662f\u4e00\u79cd\u6bd4\u8f83\u7406\u60f3\u7684\u4e8c\u53c9\u6811\u3002<\/p>\n
\u5b9a\u65f6\u5668\u7684\u673a\u5236\u5c31\u662f\uff0c\u4e8c\u53c9\u6811\u7684\u503c\u662f\u5176\u8d85\u65f6\u65f6\u95f4\uff0c\u6bcf\u6b21\u67e5\u627e\u4e8c\u53c9\u6811\u7684\u6700\u5c0f\u503c\uff0c\u5982\u679c\u6700\u5c0f\u503c\u5df2\u7ecf\u8fc7\u671f\uff0c\u5c31\u5220\u9664\u8be5\u8282\u70b9\uff0c\u7136\u540e\u7ee7\u7eed\u67e5\u627e\uff0c\u76f4\u5230\u6240\u6709\u8d85\u65f6\u8282\u70b9\u90fd\u88ab\u5220\u9664\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"
event \u6a21\u5757 event \u7684\u7c7b\u578b\u548c\u529f\u80fd Nginx \u662f\u4ee5 event\uff08\u4e8b\u4ef6\uff09\u5904\u7406\u6a21\u578b\u4e3a\u57fa\u7840\u7684\u6a21\u5757\u3002\u5b83\u4e3a\u4e86\u652f […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[42],"tags":[],"class_list":["post-185832","post","type-post","status-publish","format-standard","hentry","category-nginx"],"_links":{"self":[{"href":"https:\/\/idc.net\/help\/wp-json\/wp\/v2\/posts\/185832","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/idc.net\/help\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/idc.net\/help\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/idc.net\/help\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/idc.net\/help\/wp-json\/wp\/v2\/comments?post=185832"}],"version-history":[{"count":0,"href":"https:\/\/idc.net\/help\/wp-json\/wp\/v2\/posts\/185832\/revisions"}],"wp:attachment":[{"href":"https:\/\/idc.net\/help\/wp-json\/wp\/v2\/media?parent=185832"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/idc.net\/help\/wp-json\/wp\/v2\/categories?post=185832"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/idc.net\/help\/wp-json\/wp\/v2\/tags?post=185832"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}