{"id":823,"date":"2021-12-18T18:53:14","date_gmt":"2021-12-18T10:53:14","guid":{"rendered":"https:\/\/blog.cauchyschwarz.com\/?p=823"},"modified":"2021-12-18T18:53:19","modified_gmt":"2021-12-18T10:53:19","slug":"%e6%b7%b1%e5%85%a5%e7%90%86%e8%a7%a3nodejs%e7%ac%94%e8%ae%b0","status":"publish","type":"post","link":"https:\/\/blog.cauchyschwarz.com\/?p=823","title":{"rendered":"\u6df1\u5165\u7406\u89e3NodeJS\u7b14\u8bb0"},"content":{"rendered":"\n<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_84 ez-toc-wrap-right counter-hierarchy ez-toc-counter ez-toc-grey ez-toc-container-direction\">\n<p class=\"ez-toc-title\" style=\"cursor:inherit\">Table of Contents<\/p>\n<label for=\"ez-toc-cssicon-toggle-item-6a28e7b60fcc3\" class=\"ez-toc-cssicon-toggle-label\"><span class=\"\"><span class=\"eztoc-hide\" style=\"display:none;\">Toggle<\/span><span class=\"ez-toc-icon-toggle-span\"><svg style=\"fill: #999;color:#999\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" class=\"list-377408\" width=\"20px\" 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href=\"https:\/\/blog.cauchyschwarz.com\/?p=823\/#%E7%AC%AC%E4%B8%89%E7%AB%A0%E3%80%81%E5%BC%82%E6%AD%A5IO\" >\u7b2c\u4e09\u7ae0\u3001\u5f02\u6b65I\/O<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-1'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/blog.cauchyschwarz.com\/?p=823\/#%E7%AC%AC%E4%BA%94%E7%AB%A0%E3%80%81%E5%86%85%E5%AD%98%E6%8E%A7%E5%88%B6\" >\u7b2c\u4e94\u7ae0\u3001\u5185\u5b58\u63a7\u5236<\/a><ul class='ez-toc-list-level-2' ><li class='ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/blog.cauchyschwarz.com\/?p=823\/#1V8%E7%9A%84%E5%86%85%E5%AD%98%E9%99%90%E5%88%B6%E4%B8%8E%E5%9E%83%E5%9C%BE%E5%9B%9E%E6%94%B6%E7%AE%97%E6%B3%95\" >1.V8\u7684\u5185\u5b58\u9650\u5236\u4e0e\u5783\u573e\u56de\u6536\u7b97\u6cd5<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/blog.cauchyschwarz.com\/?p=823\/#2%E9%AB%98%E6%95%88%E4%BD%BF%E7%94%A8%E5%86%85%E5%AD%98\" >2.\u9ad8\u6548\u4f7f\u7528\u5185\u5b58<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/blog.cauchyschwarz.com\/?p=823\/#3%E5%86%85%E5%AD%98%E9%97%AE%E9%A2%98%E7%9A%84%E5%88%86%E6%9E%90\" >3.\u5185\u5b58\u95ee\u9898\u7684\u5206\u6790<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-1'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"https:\/\/blog.cauchyschwarz.com\/?p=823\/#%E7%AC%AC%E4%B8%83%E7%AB%A0%E3%80%81%E7%BD%91%E7%BB%9C%E7%BC%96%E7%A8%8B\" >\u7b2c\u4e03\u7ae0\u3001\u7f51\u7edc\u7f16\u7a0b<\/a><\/li><\/ul><\/nav><\/div>\n<h1 class=\"wp-block-heading\" id=\"%E7%AC%AC%E4%B8%89%E7%AB%A0%E5%BC%82%E6%AD%A5io\"><span class=\"ez-toc-section\" id=\"%E7%AC%AC%E4%B8%89%E7%AB%A0%E3%80%81%E5%BC%82%E6%AD%A5IO\"><\/span>\u7b2c\u4e09\u7ae0\u3001\u5f02\u6b65I\/O<span class=\"ez-toc-section-end\"><\/span><\/h1>\n\n\n\n<p class=\"wp-block-paragraph\">\u5f02\u6b65I\/O\u4e4b\u5916\u7684\u51e0\u4e2a\u5f02\u6b65API\uff1a<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u8bbe\u7f6e\u5b9a\u65f6\u5668\uff1a<\/p>\n\n\n\n<ul class=\"wp-block-list\"><li><code>setImmediate(callback[,...args])<\/code><br>\u5728\u8be5\u6b21Nodejs\u4e8b\u4ef6\u5faa\u73af\u7684\u672b\u5c3e\u6267\u884c\u8fd9\u4e2a\u51fd\u6570<\/li><li><code>setTimeout(callback,delay[,...args])<\/code><br>\u8bbe\u7f6edelay\u6beb\u79d2\u4e4b\u540e\u6267\u884c\u8fd9\u4e2a\u51fd\u6570\uff0c\u4e00\u6b21\u6027\u7684<\/li><li><code>setInterval(callback,delay[,...args])<\/code><br>\u6309\u7167delay\u6beb\u79d2\u7684\u95f4\u9694\u6267\u884c\u8fd9\u4e2a\u51fd\u6570<\/li><\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">\u53d6\u6d88\u5b9a\u65f6\u5668\uff1a<\/p>\n\n\n\n<ul class=\"wp-block-list\"><li><code>clearImmediate(immediate)<\/code><\/li><li><code>clearInterval(timeout)<\/code><\/li><li><code>clearTimeout(timeout)<\/code><\/li><\/ul>\n\n\n\n<p class=\"wp-block-paragraph\"><a href=\"https:\/\/nodejs.org\/en\/docs\/guides\/event-loop-timers-and-nexttick\/\">NodeJS\u7684\u4e8b\u4ef6\u5faa\u73af\u7684\u89e3\u91ca<\/a>\uff1a<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">NodeJS\u5728\u5904\u7406\u5b8c\u6211\u4eec\u63d0\u4f9b\u7684JS\u7a0b\u5e8f\u4e4b\u540e(\u6211\u4eec\u63d0\u4f9b\u7684JS\u7a0b\u5e8f\u4f1a\u8bbe\u7f6etimers\uff0c\u8fdb\u884c\u5f02\u6b65API\u8c03\u7528\uff0c\u6216\u8005\u8c03\u7528process.nextTick()\u51fd\u6570\u7b49)\uff0c\u4fbf\u8fdb\u5165\u4e0b\u9762\u7684\u4e8b\u4ef6\u5faa\u73af(event loop)\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code class=\"\">   \u250c\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\u2500\u2500\u2510\n\u250c\u2500&gt;\u2502           timers          \u2502\n\u2502  \u2514\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u252c\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2518\n\u2502  \u250c\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2534\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2510\n\u2502  \u2502     pending callbacks     \u2502\n\u2502  \u2514\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u252c\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2518\n\u2502  \u250c\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2534\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2510\n\u2502  \u2502       idle, prepare       \u2502\n\u2502  \u2514\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u252c\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2518      \u250c\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2510\n\u2502  \u250c\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2534\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2510      \u2502   incoming:   \u2502\n\u2502  \u2502           poll            \u2502&lt;\u2500\u2500\u2500\u2500\u2500\u2524  connections, \u2502\n\u2502  \u2514\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u252c\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2518      \u2502   data, etc.  \u2502\n\u2502  \u250c\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2534\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2510      \u2514\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2518\n\u2502  \u2502           check           \u2502\n\u2502  \u2514\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u252c\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2518\n\u2502  \u250c\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2534\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2510\n\u2514\u2500\u2500\u2524      close callbacks      \u2502\n   \u2514\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\u2500\u2500\u2518\n<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\u4e0a\u56fe\u4e2d\u7684\u6bcf\u4e2a\u6846\u90fd\u662fevent loop\u91cc\u5b9a\u4e49\u597d\u7684\u4e00\u4e2a\u9636\u6bb5phase\uff0c\u6bcf\u8fdb\u5165\u4e00\u4e2a\u65b0\u7684\u9636\u6bb5\u65f6\uff0cNodeJS\u5148\u505a\u4e00\u4e9b\u7279\u5c5e\u4e8e\u8be5\u9636\u6bb5\u7684\u4e8b\u60c5\uff0c\u7136\u540e\u5c31\u5f00\u59cb\u6267\u884c\u8be5\u9636\u6bb5\u7684\u56de\u8c03\u3002\u5f53\u8be5\u9636\u6bb5\u7684\u56de\u8c03\u6267\u884c\u5b8c\u6216\u8005\u6267\u884c\u7684\u56de\u8c03\u6570\u5230\u8fbe\u9608\u503c\u540eNodeJS\u5c31\u7ee7\u7eed\u8fdb\u5165\u4e0b\u4e00\u4e2a\u9636\u6bb5\u3002<br>\u5728event loop\u4e4b\u95f4NodeJS\u4f1a\u68c0\u67e5\u662f\u5426\u8fd8\u6709Timer\u9700\u8981\u6267\u884c\u6216\u8005\u662f\u5426\u6709\u5f02\u6b65\u8c03\u7528\u6ca1\u6709\u5b8c\u6210\uff0c\u5982\u679c\u6ca1\u6709\uff0c\u90a3\u4e48NodeJS\u5c31\u9000\u51fa\uff0c\u6574\u4e2aNodeJS\u7a0b\u5e8f\u7ed3\u675f\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u5bf9\u4e8e\u5404\u4e2aphase\u7684\u89e3\u91ca\uff1a<\/p>\n\n\n\n<ul class=\"wp-block-list\"><li><strong>timers<\/strong><br>\u6267\u884csetTimeout\u548csetInterval\u51fd\u6570\u8bbe\u7f6e\u7684\u56de\u8c03<\/li><li><strong>pending callbacks<\/strong><br>\u6267\u884c\u88ab\u5ef6\u8fdf\u5230\u4e0b\u4e00\u4e2a\u5faa\u73af\u6267\u884c\u7684I\/O\u56de\u8c03\u3002This phase executes callbacks for some system operations such as types of TCP errors. For example if a TCP socket receives ECONNREFUSED when attempting to connect, some *nix systems want to wait to report the error. This will be queued to execute in the pending callbacks phase.<br>\u6bd4\u8f83\u7ed5\uff0c\u610f\u601d\u662f\u4e00\u4e9b\u7279\u6b8a\u7684\u6bd4\u5982TCP\u9519\u8bef\u4e8b\u4ef6\u7684\u56de\u8c03\u4f1a\u5728<strong>pending callbacks<\/strong>\u9636\u6bb5\u6267\u884c\u5457\u3002<\/li><li><strong>idle,prepare<\/strong><br>NodeJS\u5185\u90e8\u4f7f\u7528<\/li><li><strong>poll<\/strong><br>\u8bfb\u53d6I\/O\u4e8b\u4ef6\uff0c\u6267\u884cI\/O\u76f8\u5173\u7684\u56de\u8c03(\u4e0d\u5305\u542bclose\u76f8\u5173\u7684\u56de\u8c03\uff0ctimers\u76f8\u5173\u7684\u56de\u8c03\uff0c\u548csetImmediate\u7684\u56de\u8c03)<\/li><li><strong>check<\/strong><br>\u6267\u884csetImmediate\u8bbe\u7f6e\u7684\u56de\u8c03<\/li><li><strong>close callbacks<\/strong><br>\u6267\u884cclose\u76f8\u5173\u7684\u56de\u8c03<\/li><\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">\u5173\u4e8esetTimeout(fn, 0)\u548csetImmediate,process.nextTick\u7684\u8fa8\u6790\uff1a<\/p>\n\n\n\n<ol class=\"wp-block-list\"><li>setImmediate\u7684\u56de\u8c03\u662f\u5728check\u9636\u6bb5\u6267\u884c\uff0c\u800cprocess.nextTick\u662f\u5728\u6bcf\u6b21\u5c06\u8981\u8fdb\u5165\u4e00\u4e2a\u65b0\u9636\u6bb5\u65f6\u90fd\u4f1a\u68c0\u67e5\u6267\u884c\uff0c\u6240\u4ee5<a href=\"http:\/\/voidcanvas.com\/setimmediate-vs-nexttick-vs-settimeout\/#setimmediate-runs-before-settimeoutfn-0\">\u8fd9\u4e24\u4e2a\u51fd\u6570\u7684\u540d\u5b57\u5176\u5b9e\u53d6\u53cd\u4e86<\/a>\uff1b<\/li><li>setTimeout(fn, 0)\u548csetImmediate\u6267\u884c\u7684\u5148\u540e\u987a\u5e8f\u95ee\u9898\uff1a<\/li><\/ol>\n\n\n\n<pre class=\"wp-block-code\"><code lang=\"javascript\" class=\"language-javascript\">  <em>\/\/ timeout_vs_immediate.js<\/em>\n  setTimeout(() =&gt; {\n    console.log('timeout');\n  }, 0);\n  \n  setImmediate(() =&gt; {\n    console.log('immediate');\n  });\n\n<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\u4e0a\u9762\u8fd9\u6bb5\u4ee3\u7801setTimeout\u548csetImmediate\u7684\u56de\u8c03\u7684\u6267\u884c\u5148\u540e\u987a\u5e8f\u662f\u4e0d\u786e\u5b9a\u7684\u3002\u4e3b\u8981\u539f\u56e0\u662f<strong>setTimeout(fn, 0)\u5176\u5b9e\u662fsetTimeout(fn, 1)<\/strong>\uff0csetTimeout,setInterval\u7684delay\u6700\u5c0f\u662f1ms\uff0c\u90a3\u4e48\u5728\u8fdb\u5165\u4e8b\u4ef6\u5faa\u73af\u7684\u65f6\u5019\uff0c\u7531\u4e8e\u6700\u5148\u8fdb\u5165\u7684\u662ftimers\u8fd9\u4e2a\u9636\u6bb5\uff0c\u9996\u5148\u68c0\u67e5setTimeout\u8bbe\u7f6e\u7684\u8fd9\u4e2a1ms\u7684timer\u56de\u8c03\uff0c\u8fd9\u4e2a\u65f6\u5019NodeJS\u5185\u90e8\u7684\u65f6\u95f4\u8ba1\u6570\u53ef\u80fd\u8fbe\u5230\u4e861ms\uff0c\u4e5f\u53ef\u80fd\u6ca1\u6709\u8fbe\u5230\uff0c\u5982\u679c\u8fbe\u5230\u4e861ms\u90a3\u4e48\u5c31\u6267\u884c\u8fd9\u4e2atimer\uff0c\u5982\u679c\u6ca1\u6709\u8fbe\u52301ms\u90a3\u4e48\u5c31\u4f1a\u6309\u7167\u4e8b\u4ef6\u5faa\u73af\u5404\u4e2a\u9636\u6bb5\u987a\u5e8f\u5148\u6267\u884ccheck\u9636\u6bb5\u91cc\u7684\u90a3\u4e2asetImmediate\u8bbe\u7f6e\u7684timer\uff0c\u7136\u540e\u5728\u7b2c\u4e8c\u6b21\u4e8b\u4ef6\u5faa\u73af\u7684timer\u9636\u6bb5\u518d\u6765\u6267\u884c\u8fd9\u4e2a1ms\u7684timer\u3002\u5177\u4f53\u53ef\u4ee5\u770b<a href=\"https:\/\/segmentfault.com\/a\/1190000013102056\">segmentfault\u7684\u8fd9\u7bc7\u8ba8\u8bba<\/a>\u8fd8\u6709<a href=\"http:\/\/voidcanvas.com\/nodejs-event-loop\/\">\u8fd9\u7bc7\u6587\u7ae0\u4e2d\u5173\u4e8e\u8fd9\u4e2a\u4f8b\u5b50\u7684\u89e3\u91ca<\/a>\u3002<\/p>\n\n\n\n<h1 class=\"wp-block-heading\" id=\"%E7%AC%AC%E4%BA%94%E7%AB%A0%E5%86%85%E5%AD%98%E6%8E%A7%E5%88%B6\"><span class=\"ez-toc-section\" id=\"%E7%AC%AC%E4%BA%94%E7%AB%A0%E3%80%81%E5%86%85%E5%AD%98%E6%8E%A7%E5%88%B6\"><\/span>\u7b2c\u4e94\u7ae0\u3001\u5185\u5b58\u63a7\u5236<span class=\"ez-toc-section-end\"><\/span><\/h1>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"1v8%E7%9A%84%E5%86%85%E5%AD%98%E9%99%90%E5%88%B6%E4%B8%8E%E5%9E%83%E5%9C%BE%E5%9B%9E%E6%94%B6%E7%AE%97%E6%B3%95\"><span class=\"ez-toc-section\" id=\"1V8%E7%9A%84%E5%86%85%E5%AD%98%E9%99%90%E5%88%B6%E4%B8%8E%E5%9E%83%E5%9C%BE%E5%9B%9E%E6%94%B6%E7%AE%97%E6%B3%95\"><\/span>1.V8\u7684\u5185\u5b58\u9650\u5236\u4e0e\u5783\u573e\u56de\u6536\u7b97\u6cd5<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">V8\u865a\u62df\u673a\u5f53\u521d\u8bbe\u8ba1\u662f\u7528\u5728\u6d4f\u89c8\u5668\u91cc\u9762\u7684\uff0c\u5e76\u4e14chrome\u7684\u6bcf\u4e2a\u6807\u7b7e\u90fd\u6709\u4e00\u4e2aV8\u865a\u62df\u673a\u5b9e\u4f8b\uff0c\u6240\u4ee5V8\u5bf9\u5806\u5185\u5b58\u505a\u4e86\u4e00\u4e2a\u53ea\u80fd\u4f7f\u75281.4\u30011.5GB\u7684\u9650\u5236\uff0c\u8fd9\u6837\u6765\u9650\u5236\u6bcf\u6b21\u5783\u573e\u56de\u6536\u7684\u65f6\u95f4\u4e0d\u4f1a\u8fc7\u957f\u4ee5\u81f4\u5f71\u54cd\u7528\u6237\u4f53\u9a8c\u3002\u4f46\u662f\u6211\u4eec\u5199\u670d\u52a1\u5668\u662f\u4e0d\u53ef\u80fd\u5fcd\u7684\u4e86\u53ea\u80fd\u75281\u30012\u4e2aGB\u7684\u5185\u5b58\u7684\uff0c\u6240\u4ee5\u89e3\u51b3\u65b9\u6cd5\u5c31\u662f\uff1a<\/p>\n\n\n\n<ol class=\"wp-block-list\"><li>\u4f7f\u7528\u4e0d\u5c5e\u4e8e\u5806\u5185\u5b58\u7684buffer\uff0cbuffer\u4e0d\u53d7\u8fd9\u4e2a\u5806\u5185\u5b58\u5927\u5c0f\u9650\u5236\uff0c\u53ea\u548c\u7269\u7406\u5185\u5b58\u591a\u5c11\u6709\u5173\uff1b<\/li><li>\u5728\u542f\u52a8node\u5e94\u7528\u7684\u65f6\u5019\u628a\u5806\u5185\u5b58\u7684\u5927\u5c0f\u9650\u5236\u53c2\u6570\u6539\u5927\uff1b<\/li><li>\u5199\u5e94\u7528\u65f6\u8282\u7ea6\u5185\u5b58\u7684\u4f7f\u7528\u5e76\u4e14\u6ce8\u610f\u4e0d\u8981\u4ea7\u751f\u5185\u5b58\u6cc4\u6f0f\uff1b<\/li><\/ol>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>v8\u7684\u5783\u573e\u56de\u6536\u673a\u5236<\/strong>\uff1a<br>\u5c06\u5360\u7528\u5185\u5b58\u7684\u5bf9\u8c61\u5206\u4e3a\u4e24\u4ee3\uff0c\u65b0\u751f\u4ee3\u548c\u8001\u751f\u4ee3\u3002\u65b0\u751f\u4ee3\u6307\u5b58\u6d3b\u5468\u671f\u77ed\u7684\u5bf9\u8c61\uff0c\u8001\u751f\u4ee3\u6307\u5b58\u6d3b\u5468\u671f\u957f\u7684\u5bf9\u8c61\u3002node\u5206\u522b\u7528<code>--max-new-space-size<\/code>\u548c<code>--max-old-space-size<\/code>\u4e24\u4e2a\u53c2\u6570\u6765\u9650\u5236\u8fd9\u4e24\u79cd\u5bf9\u8c61\u6240\u5360\u7528\u7684\u6700\u5927\u5806\u5185\u5b58\u3002\u6309\u7167\u4e66\u4e2d\u7684\u6570\u636e\uff0c\u8001\u751f\u4ee3\u9ed8\u8ba4\u591a\u8fbe1.4GB\uff0c\u65b0\u751f\u4ee3\u53ea\u670916MB,32MB\u7684\u6837\u5b50\u3002\u65b0\u751f\u4ee3\u91c7\u7528Scavenge\u7b97\u6cd5\uff0c\u5177\u4f53\u7684\u5b9e\u73b0\u53c8\u91c7\u7528\u4e86Cheney\u7b97\u6cd5\uff0c\u5176\u5b9e\u5c31\u662f\u5185\u5b58\u5206\u914d\u5668\u7684\u4f19\u4f34\u7cfb\u7edf\uff0c\u628a\u65b0\u751f\u4ee3\u9884\u5148\u5206\u914d\u597d\u7684\u5185\u5b58\u7a7a\u95f4\u5206\u4e24\u534a\uff0c\u5bfc\u6765\u5bfc\u53bb\u3002\u56e0\u4e3a\u65b0\u751f\u4ee3\u662f\u58f0\u660e\u5468\u671f\u77ed\u7684\u5bf9\u8c61\uff0c\u6240\u4ee5\u6bcf\u6b21\u4ece\u4e00\u534a\u7a7a\u95f4\u62f7\u8d1d\u5230\u53e6\u4e00\u534a\u7a7a\u95f4\u65f6\uff0c\u53ea\u9700\u62f7\u8d1d\u6d3b\u7684\u5bf9\u8c61\u5c31\u597d\u4e86\u3002\u8001\u751f\u4ee3\u5219\u91c7\u7528Mark-Sweep\u7684\u7b97\u6cd5\uff0c\u628a\u4e0d\u518d\u9700\u8981\u7684\u5bf9\u8c61\u5360\u7528\u7684\u7a7a\u95f4\u91ca\u653e\u5c31\u597d\uff0c\u4e3a\u4e86\u907f\u514d\u4ea7\u751f\u8fc7\u591a\u7684\u5185\u5b58\u788e\u7247\uff0c\u6216\u8005\u662f\u6709\u5bf9\u8c61\u653e\u4e0d\u4e0b\u7684\u65f6\u5019\u5c31\u8dd1\u4e00\u4e0bMark-Compact\u7b97\u6cd5\uff0c\u5c31\u662f\u6bcf\u6b21\u5148\u628a\u4e0d\u9700\u8981\u7684\u5bf9\u8c61\u79fb\u5230\u5185\u5b58\u7a7a\u95f4\u7684\u4e00\u7aef\uff0c\u7136\u540e\u518d\u5c06\u5176\u7a7a\u95f4\u91ca\u653e\uff0c\u8fd9\u6837\u5c31\u4e0d\u4f1a\u4ea7\u751f\u5185\u5b58\u7a7a\u95f4\u4e0a\u7684\u6f0f\u6d1e\u3002\u65b0\u751f\u4ee3\u664b\u5347\u4e3a\u8001\u751f\u4ee3\u7684\u6761\u4ef6\uff1a\u8be5\u5bf9\u8c61\u5df2\u7ecf\u62f7\u8d1d\u8fc7\u4e00\u6b21\u4e86(\u5373\u7ecf\u5386\u8fc7\u4e00\u6b21Scavenge\u7b97\u6cd5)\u6216\u8005To\u7a7a\u95f4\u7684\u5185\u5b58\u5360\u7528\u6bd4\u4f8b\u8d85\u8fc7\u9650\u5236(\u4f19\u4f34\u7cfb\u7edf\u628a\u5185\u5b58\u5206\u6210\u4e86\u5927\u5c0f\u76f8\u7b49\u7684From,To\u4e24\u4e2a\u534a\u7a7a\u95f4\uff0c\u6bcf\u6b21\u5bfc\u5b8c\u6d3b\u7740\u7684\u5bf9\u8c61\u540e\uff0cFrom,To\u7684\u89d2\u8272\u4e92\u6362)\u3002\u5f53\u7136\u5168\u505c\u987f\u7684\u5783\u573e\u56de\u6536\u65b9\u5f0f\u662f\u5f88\u5f71\u54cd\u4f53\u9a8c\u7684\uff0c\u6240\u4ee5V8\u8fd8\u6709Incremental Marking\uff0clazy sweeping\u548cincremental compaction\u7b49\u8bbe\u8ba1\uff0c\u628a\u5783\u573e\u56de\u6536\u7684\u5de5\u4f5c\u62c6\u89e3\u4f18\u5316\uff0c\u5c3d\u91cf\u4e0d\u56e0\u4e3a\u5783\u573e\u56de\u6536\u4ea7\u751f\u5927\u7684\u505c\u987f\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u51e0\u4e2a\u7528\u4e8e\u5206\u6790\u5783\u573e\u56de\u6536\u7684\u9009\u9879\uff1a<\/p>\n\n\n\n<ul class=\"wp-block-list\"><li><code>--trace_gc<\/code><\/li><li><code>--prof<\/code><\/li><\/ul>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"2%E9%AB%98%E6%95%88%E4%BD%BF%E7%94%A8%E5%86%85%E5%AD%98\"><span class=\"ez-toc-section\" id=\"2%E9%AB%98%E6%95%88%E4%BD%BF%E7%94%A8%E5%86%85%E5%AD%98\"><\/span>2.\u9ad8\u6548\u4f7f\u7528\u5185\u5b58<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<ul class=\"wp-block-list\"><li>\u4f7f\u7528delete\u6765\u91ca\u653e\u5168\u5c40\u53d8\u91cf<\/li><li>\u5c0f\u5fc3<strong>\u95ed\u5305<\/strong><\/li><\/ul>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"3%E5%86%85%E5%AD%98%E9%97%AE%E9%A2%98%E7%9A%84%E5%88%86%E6%9E%90\"><span class=\"ez-toc-section\" id=\"3%E5%86%85%E5%AD%98%E9%97%AE%E9%A2%98%E7%9A%84%E5%88%86%E6%9E%90\"><\/span>3.\u5185\u5b58\u95ee\u9898\u7684\u5206\u6790<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<ul class=\"wp-block-list\"><li>\u67e5\u770b\u8fdb\u7a0b\u5185\u5b58\u5360\u7528<br><code>process.memoryUsage()<\/code><\/li><li>\u67e5\u770b\u7cfb\u7edf\u7684\u5185\u5b58\u5360\u7528<br><code>os.totalmem()<\/code><br><code>os.freemem()<\/code><\/li><li>\u5185\u5b58\u6cc4\u6f0f\u6392\u67e5\u5de5\u5177<ul><li>node-heapdump<\/li><li>node-memwatch<\/li><\/ul><\/li><\/ul>\n\n\n\n<h1 class=\"wp-block-heading\" id=\"%E7%AC%AC%E4%B8%83%E7%AB%A0%E7%BD%91%E7%BB%9C%E7%BC%96%E7%A8%8B\"><span class=\"ez-toc-section\" id=\"%E7%AC%AC%E4%B8%83%E7%AB%A0%E3%80%81%E7%BD%91%E7%BB%9C%E7%BC%96%E7%A8%8B\"><\/span>\u7b2c\u4e03\u7ae0\u3001\u7f51\u7edc\u7f16\u7a0b<span class=\"ez-toc-section-end\"><\/span><\/h1>\n\n\n\n<p class=\"wp-block-paragraph\">\u51e0\u79cd\u5e94\u7528\u5c42\u534f\u8bae\uff1a<\/p>\n\n\n\n<ul class=\"wp-block-list\"><li>HTTP<\/li><li>HTTPS<\/li><li>WebSocket<\/li><\/ul>\n","protected":false},"excerpt":{"rendered":"<p>\u7b2c\u4e09\u7ae0\u3001\u5f02\u6b65I\/O \u5f02\u6b65I\/O\u4e4b\u5916\u7684\u51e0\u4e2a\u5f02\u6b65API\uff1a \u8bbe\u7f6e\u5b9a\u65f6\u5668\uff1a setImmediate(callback[,&#8230;args])\u5728\u8be5\u6b21Nodejs\u4e8b\u4ef6\u5faa\u73af\u7684\u672b\u5c3e\u6267\u884c\u8fd9\u4e2a\u51fd\u6570 setTimeout(&#46;&#46;&#46;<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[10],"tags":[88,9],"class_list":["post-823","post","type-post","status-publish","format-standard","hentry","category-10","tag-nodejs","tag-9"],"_links":{"self":[{"href":"https:\/\/blog.cauchyschwarz.com\/index.php?rest_route=\/wp\/v2\/posts\/823","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/blog.cauchyschwarz.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/blog.cauchyschwarz.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/blog.cauchyschwarz.com\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/blog.cauchyschwarz.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=823"}],"version-history":[{"count":1,"href":"https:\/\/blog.cauchyschwarz.com\/index.php?rest_route=\/wp\/v2\/posts\/823\/revisions"}],"predecessor-version":[{"id":824,"href":"https:\/\/blog.cauchyschwarz.com\/index.php?rest_route=\/wp\/v2\/posts\/823\/revisions\/824"}],"wp:attachment":[{"href":"https:\/\/blog.cauchyschwarz.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=823"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/blog.cauchyschwarz.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=823"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/blog.cauchyschwarz.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=823"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}