{"id":7605,"date":"2022-10-20T14:47:35","date_gmt":"2022-10-20T06:47:35","guid":{"rendered":"https:\/\/egonlin.com\/?p=7605"},"modified":"2022-10-20T14:50:50","modified_gmt":"2022-10-20T06:50:50","slug":"linux-swap%e5%88%86%e5%8c%ba%e5%b7%a5%e4%bd%9c%e5%8e%9f%e7%90%86%e5%8f%8a%e9%97%ae%e9%a2%98%e5%ae%9a%e4%bd%8d","status":"publish","type":"post","link":"https:\/\/egonlin.com\/?p=7605","title":{"rendered":"\u7b2c\u4e03\u8282\uff1aswap\u5206\u533a\u5de5\u4f5c\u539f\u7406"},"content":{"rendered":"<h1>\u4e00\u3001\u6587\u4ef6\u9875\u548c\u533f\u540d\u9875<\/h1>\n<h2>1\u3001\u6587\u4ef6\u9875<\/h2>\n<p>\u5f53\u53d1\u751f\u4e86\u5185\u5b58\u6cc4\u6f0f\u65f6\uff0c\u6216\u8005\u8fd0\u884c\u4e86\u5927\u5185\u5b58\u7684\u5e94\u7528\u7a0b\u5e8f\uff0c\u5bfc\u81f4\u7cfb\u7edf\u7684\u5185\u5b58\u8d44\u6e90\u7d27\u5f20\u65f6\uff0c\u7cfb\u7edf\u53c8\u4f1a\u5982\u4f55\u5e94\u5bf9\u5462\uff1f\u5185\u5b58\u56de\u6536\u548c OOM 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Page\uff09\u3002<\/p>\n<p>\u5927\u90e8\u5206\u6587\u4ef6\u9875\uff0c\u90fd\u53ef\u4ee5\u76f4\u63a5\u56de\u6536\uff0c\u4ee5\u540e\u6709\u9700\u8981\u65f6\uff0c\u518d\u4ece\u78c1\u76d8\u91cd\u65b0\u8bfb\u53d6\u5c31\u53ef\u4ee5\u4e86\u3002\u800c\u90a3\u4e9b\u88ab\u5e94\u7528\u7a0b\u5e8f\u4fee\u6539\u8fc7\uff0c\u5e76\u4e14\u6682\u65f6\u8fd8\u6ca1\u5199\u5165\u78c1\u76d8\u7684\u6570\u636e\uff08\u4e5f\u5c31\u662f\u810f\u9875\uff09\uff0c\u5c31\u5f97\u5148\u5199\u5165\u78c1\u76d8\uff0c\u7136\u540e\u624d\u80fd\u8fdb\u884c\u5185\u5b58\u91ca\u653e\u3002\u8fd9\u4e9b\u810f\u9875\uff0c\u4e00\u822c\u53ef\u4ee5\u901a\u8fc7\u4e24\u79cd\u65b9\u5f0f\u5199\u5165\u78c1\u76d8\u3002<\/p>\n<p>\u53ef\u4ee5\u5728\u5e94\u7528\u7a0b\u5e8f\u4e2d\uff0c\u901a\u8fc7\u7cfb\u7edf\u8c03\u7528 fsync \uff0c\u628a\u810f\u9875\u540c\u6b65\u5230\u78c1\u76d8\u4e2d\uff1b<br \/>\n\u4e5f\u53ef\u4ee5\u4ea4\u7ed9\u7cfb\u7edf\uff0c\u7531\u5185\u6838\u7ebf\u7a0b pdflush \u8d1f\u8d23\u8fd9\u4e9b\u810f\u9875\u7684\u5237\u65b0\u3002<br \/>\n\u9664\u4e86\u7f13\u5b58\u548c\u7f13\u51b2\u533a\uff0c\u901a\u8fc7\u5185\u5b58\u6620\u5c04\u83b7\u53d6\u7684\u6587\u4ef6\u6620\u5c04\u9875\uff0c\u4e5f\u662f\u4e00\u79cd\u5e38\u89c1\u7684\u6587\u4ef6\u9875\u3002\u5b83\u4e5f\u53ef\u4ee5\u88ab\u91ca\u653e\u6389\uff0c\u4e0b\u6b21\u518d\u8bbf\u95ee\u7684\u65f6\u5019\uff0c\u4ece\u6587\u4ef6\u91cd\u65b0\u8bfb\u53d6\u3002<\/p>\n<h2>2\u3001\u533f\u540d\u9875<\/h2>\n<p>\u5e94\u7528\u7a0b\u5e8f\u52a8\u6001\u5206\u914d\u7684\u5806\u5185\u5b58\uff0c\u4e5f\u5c31\u662f\u6211\u4eec\u5728\u5185\u5b58\u7ba1\u7406\u4e2d\u8bf4\u5230\u7684\u533f\u540d\u9875\uff08Anonymous Page\uff09\uff0c\u8fd9\u4e9b\u5185\u5b58\u81ea\u7136\u4e0d\u80fd\u76f4\u63a5\u91ca\u653e\u3002\u4f46\u662f\uff0c\u5982\u679c\u8fd9\u4e9b\u5185\u5b58\u5728\u5206\u914d\u540e\u5f88\u5c11\u88ab\u8bbf\u95ee\uff0c\u4f3c\u4e4e\u4e5f\u662f\u4e00\u79cd\u8d44\u6e90\u6d6a\u8d39\u3002\u662f\u4e0d\u662f\u53ef\u4ee5\u628a\u5b83\u4eec\u6682\u65f6\u5148\u5b58\u5728\u78c1\u76d8\u91cc\uff0c\u91ca\u653e\u5185\u5b58\u7ed9\u5176\u4ed6\u66f4\u9700\u8981\u7684\u8fdb\u7a0b\uff1f<\/p>\n<p>\u8fd9\u6b63\u662f Linux \u7684 Swap \u673a\u5236\u3002Swap \u628a\u8fd9\u4e9b\u4e0d\u5e38\u8bbf\u95ee\u7684\u5185\u5b58\u5148\u5199\u5230\u78c1\u76d8\u4e2d\uff0c\u7136\u540e\u91ca\u653e\u8fd9\u4e9b\u5185\u5b58\uff0c\u7ed9\u5176\u4ed6\u66f4\u9700\u8981\u7684\u8fdb\u7a0b\u4f7f\u7528\u3002\u518d\u6b21\u8bbf\u95ee\u8fd9\u4e9b\u5185\u5b58\u65f6\uff0c\u91cd\u65b0\u4ece\u78c1\u76d8\u8bfb\u5165\u5185\u5b58\u5c31\u53ef\u4ee5\u4e86\u3002<\/p>\n<h1>\u4e8c\u3001Swap\u5de5\u4f5c\u539f\u7406<\/h1>\n<p>\u5728Linux\u4e0b\uff0cSWAP\u7684\u4f5c\u7528\u7c7b\u4f3cWindows\u7cfb\u7edf\u4e0b\u7684\u201c\u865a\u62df\u5185\u5b58\u201d\u3002\u5f53\u7269\u7406\u5185\u5b58\u4e0d\u8db3\u65f6\uff0c\u62ff\u51fa\u90e8\u5206\u786c\u76d8\u7a7a\u95f4\u5f53SWAP\u5206\u533a\uff08\u865a\u62df\u6210\u5185\u5b58\uff09\u4f7f\u7528\uff0c\u4ece\u800c\u89e3\u51b3\u5185\u5b58\u5bb9\u91cf\u4e0d\u8db3\u7684\u60c5\u51b5\u3002\u8bf4\u767d\u4e86\u5c31\u662f\u628a\u4e00\u5757\u78c1\u76d8\u7a7a\u95f4\u6216\u8005\u4e00\u4e2a\u672c\u5730\u6587\u4ef6\uff08\u4ee5\u4e0b\u8bb2\u89e3\u4ee5\u78c1\u76d8\u4e3a\u4f8b\uff09\uff0c\u5f53\u6210\u5185\u5b58\u6765\u4f7f\u7528\u3002\u5b83\u5305\u62ec\u6362\u51fa\u548c\u6362\u5165\u4e24\u4e2a\u8fc7\u7a0b\u3002<br \/>\n\u6362\u51fa\uff0c\u5c31\u662f\u628a\u8fdb\u7a0b\u6682\u65f6\u4e0d\u7528\u7684\u5185\u5b58\u6570\u636e\u5b58\u50a8\u5230\u78c1\u76d8\u4e2d\uff0c\u5e76\u91ca\u653e\u8fd9\u4e9b\u6570\u636e\u5360\u7528\u7684\u5185\u5b58\u3002<\/p>\n<p>\u6362\u5165\uff0c\u5219\u662f\u5728\u8fdb\u7a0b\u518d\u6b21\u8bbf\u95ee\u8fd9\u4e9b\u5185\u5b58\u7684\u65f6\u5019\uff0c\u628a\u5b83\u4eec\u4ece\u78c1\u76d8\u8bfb\u5230\u5185\u5b58\u4e2d\u6765\u3002<br \/>\nSwap \u5176\u5b9e\u662f\u628a\u7cfb\u7edf\u7684\u53ef\u7528\u5185\u5b58\u53d8\u5927\u4e86\u3002\u5373\u4f7f\u670d\u52a1\u5668\u7684\u5185\u5b58\u4e0d\u8db3\uff0c\u4e5f\u53ef\u4ee5\u8fd0\u884c\u5927\u5185\u5b58\u7684\u5e94\u7528\u7a0b\u5e8f\u3002\u4e8b\u5b9e\u4e0a\uff0c\u5185\u5b58\u518d\u5927\uff0c\u5bf9\u5e94\u7528\u7a0b\u5e8f\u6765\u8bf4\uff0c\u4e5f\u6709\u4e0d\u591f\u7528\u7684\u65f6\u5019\u3002<\/p>\n<p>\u7cfb\u7edf\u603b\u662f\u5728\u7269\u7406\u5185\u5b58\u4e0d\u591f\u65f6\uff0c\u624d\u8fdb\u884cSwap\u4ea4\u6362\u3002swap\u5927\u5c0f\u662f\u6709\u4e0a\u9650\u7684\uff0c\u4e00\u65e6swap\u4f7f\u7528\u5b8c\uff0c\u64cd\u4f5c\u7cfb\u7edf\u4f1a\u89e6\u53d1OOM-Killer\u673a\u5236\uff0c\u628a\u6d88\u8017\u5185\u5b58\u6700\u591a\u7684\u8fdb\u7a0bkill\u6389\u4ee5\u91ca\u653e\u5185\u5b58<\/p>\n<h2>2.1 swap\u4f7f\u7528\u5178\u578b\u573a\u666f\uff1a<\/h2>\n<p>\u4e00\u4e2a\u5f88\u5178\u578b\u7684\u573a\u666f\u5c31\u662f\uff0c\u5373\u4f7f\u5185\u5b58\u4e0d\u8db3\u65f6\uff0c\u6709\u4e9b\u5e94\u7528\u7a0b\u5e8f\u4e5f\u5e76\u4e0d\u60f3\u88ab OOM \u6740\u6b7b\uff0c\u800c\u662f\u5e0c\u671b\u80fd\u7f13\u4e00\u6bb5\u65f6\u95f4\uff0c\u7b49\u5f85\u4eba\u5de5\u4ecb\u5165\uff0c\u6216\u8005\u7b49\u7cfb\u7edf\u81ea\u52a8\u91ca\u653e\u5176\u4ed6\u8fdb\u7a0b\u7684\u5185\u5b58\uff0c\u518d\u5206\u914d\u7ed9\u5b83\u3002<\/p>\n<p>\u6211\u4eec\u5e38\u89c1\u7684\u7b14\u8bb0\u672c\u7535\u8111\u7684\u4f11\u7720\u548c\u5feb\u901f\u5f00\u673a\u7684\u529f\u80fd\uff0c\u4e5f\u57fa\u4e8e Swap \u3002\u4f11\u7720\u65f6\uff0c\u628a\u7cfb\u7edf\u7684\u5185\u5b58\u5b58\u5165\u78c1\u76d8\uff0c\u8fd9\u6837\u7b49\u5230\u518d\u6b21\u5f00\u673a\u65f6\uff0c\u53ea\u8981\u4ece\u78c1\u76d8\u4e2d\u52a0\u8f7d\u5185\u5b58\u5c31\u53ef\u4ee5\u3002\u8fd9\u6837\u5c31\u7701\u53bb\u4e86\u5f88\u591a\u5e94\u7528\u7a0b\u5e8f\u7684\u521d\u59cb\u5316\u8fc7\u7a0b\uff0c\u52a0\u5feb\u4e86\u5f00\u673a\u901f\u5ea6\u3002<\/p>\n<p>Swap \u662f\u4e3a\u4e86\u56de\u6536\u5185\u5b58\uff0c\u90a3\u4e48 Linux \u5230\u5e95\u5728\u4ec0\u4e48\u65f6\u5019\u9700\u8981\u56de\u6536\u5185\u5b58\u5462\uff1f\u524d\u9762\u4e00\u76f4\u5728\u8bf4\u5185\u5b58\u8d44\u6e90\u7d27\u5f20\uff0c\u53c8\u8be5\u600e\u4e48\u6765\u8861\u91cf\u5185\u5b58\u662f\u4e0d\u662f\u7d27\u5f20\u5462\uff1f<\/p>\n<h3>1\u3001\u76f4\u63a5\u5185\u5b58\u56de\u6536<\/h3>\n<p>\u5728\u5185\u5b58\u5206\u914d\u65f6\u53d1\u73b0\u6ca1\u6709\u8db3\u591f\u7a7a\u95f2\u5185\u5b58\u65f6\u4f1a\u7acb\u523b\u89e6\u53d1\u5185\u5b58\u56de\u6536\u3002<br \/>\n\u4e00\u4e2a\u6700\u5bb9\u6613\u60f3\u5230\u7684\u573a\u666f\u5c31\u662f\uff0c\u6709\u65b0\u7684\u5927\u5757\u5185\u5b58\u5206\u914d\u8bf7\u6c42\uff0c\u4f46\u662f\u5269\u4f59\u5185\u5b58\u4e0d\u8db3\u3002\u8fd9\u4e2a\u65f6\u5019\u7cfb\u7edf\u5c31\u9700\u8981\u56de\u6536\u4e00\u90e8\u5206\u5185\u5b58\uff08\u6bd4\u5982\u524d\u9762\u63d0\u5230\u7684\u7f13\u5b58\uff09\uff0c\u8fdb\u800c\u5c3d\u53ef\u80fd\u5730\u6ee1\u8db3\u65b0\u5185\u5b58\u8bf7\u6c42\u3002\u8fd9\u4e2a\u8fc7\u7a0b\u901a\u5e38\u88ab\u79f0\u4e3a\u76f4\u63a5\u5185\u5b58\u56de\u6536\u3002<\/p>\n<h3>2\u3001\u5b9a\u671f\u56de\u6536\u5185\u5b58<\/h3>\n<p>\u5f00\u542f\u4e86\u4e00\u4e2a\u5b88\u62a4\u8fdb\u7a0b\uff08swapd\u8fdb\u7a0b\uff09\u5468\u671f\u6027\u5bf9\u7cfb\u7edf\u5185\u5b58\u8fdb\u884c\u68c0\u67e5\uff0c\u5728\u53ef\u7528\u5185\u5b58\u964d\u4f4e\u5230\u7279\u5b9a\u9608\u503c\u4e4b\u540e\u4e3b\u52a8\u89e6\u53d1\u5185\u5b58\u56de\u6536\u3002\u4e13\u95e8\u7684\u5185\u6838\u7ebf\u7a0b\u7528\u6765\u5b9a\u671f\u56de\u6536\u5185\u5b58\uff0c\u4e5f\u5c31\u662f kswapd0\u3002\u4e3a\u4e86\u8861\u91cf\u5185\u5b58\u7684\u4f7f\u7528\u60c5\u51b5\uff0ckswapd0 \u5b9a\u4e49\u4e86\u4e09\u4e2a\u5185\u5b58\u9608\u503c\uff08watermark\uff0c\u4e5f\u79f0\u4e3a\u6c34\u4f4d\uff09\uff0c\u5206\u522b\u662f\uff1a<\/p>\n<ul>\n<li>\n<p>\u9875\u6700\u5c0f\u9608\u503c\uff08pages_min\uff09\uff1a<br \/>\n\u901a\u8fc7\u5185\u6838\u9009\u9879 \/proc\/sys\/vm\/min_free_kbytes \u6765\u95f4\u63a5\u8bbe\u7f6e<br \/>\n\u9875\u4f4e\u9608\u503c\uff08pages_low\uff09\uff1a<br \/>\n\u6839\u636e\u9875\u6700\u5c0f\u9608\u503c\u8ba1\u7b97\uff0c\u8ba1\u7b97\u65b9\u5f0f\u5982\u4e0b\uff1a<br \/>\npages_low = pages_min*5\/4<\/p>\n<\/li>\n<li>\n<p>\u9875\u9ad8\u9608\u503c\uff08pages_high\uff09\uff1a<br \/>\n\u6839\u636e\u9875\u6700\u5c0f\u9608\u503c\u8ba1\u7b97\uff0c\u8ba1\u7b97\u65b9\u5f0f\u5982\u4e0b\uff1a<br \/>\npages_high = pages_min*3\/2<\/p>\n<\/li>\n<li>\n<p>\u5269\u4f59\u5185\u5b58\uff0c\u5219\u4f7f\u7528pages_free \u8868\u793a\u3002<br \/>\n<div class='fancybox-wrapper lazyload-container-unload' data-fancybox='post-images' href='https:\/\/egonlin.com\/wp-content\/uploads\/2022\/10\/image-1666248113592.png'><img class=\"lazyload lazyload-style-2\" src=\"data:image\/svg+xml;base64,PCEtLUFyZ29uTG9hZGluZy0tPgo8c3ZnIHdpZHRoPSIxIiBoZWlnaHQ9IjEiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgc3Ryb2tlPSIjZmZmZmZmMDAiPjxnPjwvZz4KPC9zdmc+\"  data-original=\"https:\/\/egonlin.com\/wp-content\/uploads\/2022\/10\/image-1666248113592.png\" src=\"data:image\/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB\/AAffA0nNPuCLAAAAAElFTkSuQmCC\" alt=\"file\" \/><\/div><br \/>\nkswapd0 \u5b9a\u671f\u626b\u63cf\u5185\u5b58\u7684\u4f7f\u7528\u60c5\u51b5\uff0c\u5e76\u6839\u636e\u5269\u4f59\u5185\u5b58\u843d\u5728\u8fd9\u4e09\u4e2a\u9608\u503c\u7684\u7a7a\u95f4\u4f4d\u7f6e\uff0c\u8fdb\u884c\u5185\u5b58\u7684\u56de\u6536\u64cd\u4f5c\u3002<\/p>\n<ul>\n<li>\u5269\u4f59\u5185\u5b58\u5c0f\u4e8e\u9875\u6700\u5c0f\u9608\u503c\uff0c\u8bf4\u660e\u8fdb\u7a0b\u53ef\u7528\u5185\u5b58\u90fd\u8017\u5c3d\u4e86\uff0c\u53ea\u6709\u5185\u6838\u624d\u53ef\u4ee5\u5206\u914d\u5185\u5b58\u3002<\/li>\n<li>\u5269\u4f59\u5185\u5b58\u843d\u5728\u9875\u6700\u5c0f\u9608\u503c\u548c\u9875\u4f4e\u9608\u503c\u4e2d\u95f4\uff0c\u8bf4\u660e\u5185\u5b58\u538b\u529b\u6bd4\u8f83\u5927\uff0c\u5269\u4f59\u5185\u5b58\u4e0d\u591a\u4e86\u3002\u8fd9\u65f6 kswapd0 \u4f1a\u6267\u884c\u5185\u5b58\u56de\u6536\uff0c\u76f4\u5230\u5269\u4f59\u5185\u5b58\u5927\u4e8e\u9ad8\u9608\u503c\u4e3a\u6b62\u3002<\/li>\n<li>\u5269\u4f59\u5185\u5b58\u843d\u5728\u9875\u4f4e\u9608\u503c\u548c\u9875\u9ad8\u9608\u503c\u4e2d\u95f4\uff0c\u8bf4\u660e\u5185\u5b58\u6709\u4e00\u5b9a\u538b\u529b\uff0c\u4f46\u8fd8\u53ef\u4ee5\u6ee1\u8db3\u65b0\u5185\u5b58\u8bf7\u6c42\u3002<\/li>\n<li>\u5269\u4f59\u5185\u5b58\u5927\u4e8e\u9875\u9ad8\u9608\u503c\uff0c\u8bf4\u660e\u5269\u4f59\u5185\u5b58\u6bd4\u8f83\u591a\uff0c\u6ca1\u6709\u5185\u5b58\u538b\u529b\u3002<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<p>\u4e00\u65e6\u5269\u4f59\u5185\u5b58\u5c0f\u4e8e\u9875\u4f4e\u9608\u503c\uff0c\u5c31\u4f1a\u89e6\u53d1\u5185\u5b58\u7684\u56de\u6536\u3002<\/p>\n<h1>\u4e09\u3001swappiness<\/h1>\n<p>\u5185\u5b58\u56de\u6536\u7684\u5185\u5b58\u65e2\u5305\u62ec\u4e86\u6587\u4ef6\u9875\uff0c\u53c8\u5305\u62ec\u4e86\u533f\u540d\u9875\u3002<\/p>\n<ul>\n<li>\u5bf9\u6587\u4ef6\u9875\u7684\u56de\u6536\uff0c\u5f53\u7136\u5c31\u662f\u76f4\u63a5\u56de\u6536\u7f13\u5b58\uff0c\u6216\u8005\u628a\u810f\u9875\u5199\u56de\u78c1\u76d8\u540e\u518d\u56de\u6536\u3002<\/li>\n<li>\n<p>\u5bf9\u533f\u540d\u9875\u7684\u56de\u6536\uff0c\u5176\u5b9e\u5c31\u662f\u901a\u8fc7 Swap \u673a\u5236\uff0c\u628a\u5b83\u4eec\u5199\u5165\u78c1\u76d8\u540e\u518d\u91ca\u653e\u5185\u5b58\u3002<br \/>\n\u4e24\u79cd\u4e0d\u540c\u7684\u5185\u5b58\u56de\u6536\u673a\u5236\uff0c\u90a3\u4e48\u5728\u5b9e\u9645\u56de\u6536\u5185\u5b58\u65f6\uff0c\u5230\u5e95\u8be5\u5148\u56de\u6536\u54ea\u4e00\u79cd\u5462\uff1f<br \/>\nLinux \u63d0\u4f9b\u4e86\u4e00\u4e2a \/proc\/sys\/vm\/swappiness \u9009\u9879\uff0c\u7528\u6765\u8c03\u6574\u4f7f\u7528 Swap \u7684\u79ef\u6781\u7a0b\u5ea6\u3002swappiness \u7684\u8303\u56f4\u662f 0-100\uff0c\u6570\u503c\u8d8a\u5927\uff0c\u8d8a\u79ef\u6781\u4f7f\u7528 Swap\uff0c\u4e5f\u5c31\u662f\u66f4\u503e\u5411\u4e8e\u56de\u6536\u533f\u540d\u9875\uff1b\u6570\u503c\u8d8a\u5c0f\uff0c\u8d8a\u6d88\u6781\u4f7f\u7528 Swap\uff0c\u4e5f\u5c31\u662f\u66f4\u503e\u5411\u4e8e\u56de\u6536\u6587\u4ef6\u9875\u3002<\/p>\n<pre><code># cat \/proc\/sys\/vm\/swappiness\n60\n# sysctl -a |grep vm.swappiness\nvm.swappiness=60<\/code><\/pre>\n<p>\u4e0a\u9762\u768460\u4ee3\u8868\u7684\u662f\uff1a\u5f53\u7269\u7406\u5185\u5b58\u88ab\u4f7f\u7528\uff08100-60\uff09%\u7684\u65f6\u5019\u624d\u4f1a\u4f7f\u7528\u5230swap\uff0c<\/p>\n<ul>\n<li>vm.swappiness=0\uff1a\u8868\u793a\u6700\u5927\u9650\u5ea6\u4f7f\u7528\u7269\u7406\u5185\u5b58\uff0c\u7136\u540e\u4f7f\u7528swap<\/li>\n<li>vm.swappiness=100\uff1a\u8868\u793a\u79ef\u6781\u7684\u4f7f\u7528swap\u5206\u533a\u3002<\/li>\n<li>vm.swappiness=60\uff1a\u9ed8\u8ba4\u503c<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<p>\u503c\u5f97\u6ce8\u610f\u7684\u662f\uff0cswappiness\u4e0d\u662f\u5185\u5b58\u7684\u767e\u5206\u6bd4\uff0c\u800c\u662f\u8c03\u6574 Swap \u79ef\u6781\u7a0b\u5ea6\u7684\u6743\u91cd\uff0c\u5373\u4f7f\u4f60\u628a\u5b83\u8bbe\u7f6e\u6210 0\uff0c\u5f53\u5269\u4f59\u5185\u5b58 + \u6587\u4ef6\u9875\u5c0f\u4e8e\u9875\u9ad8\u9608\u503c\u65f6\uff0c\u8fd8\u662f\u4f1a\u53d1\u751f Swap\u3002<\/p>\n<h1>\u56db\u3001NUMA \u4e0e Swap<\/h1>\n<p>\u5f88\u591a\u60c5\u51b5\u4e0b\uff0c\u4f60\u660e\u660e\u53d1\u73b0\u4e86 Swap \u5347\u9ad8\uff0c\u53ef\u662f\u5728\u5206\u6790\u7cfb\u7edf\u7684\u5185\u5b58\u4f7f\u7528\u65f6\uff0c\u5374\u5f88\u53ef\u80fd\u53d1\u73b0\uff0c\u7cfb\u7edf\u5269\u4f59\u5185\u5b58\u8fd8\u591a\u7740\u5462\u3002\u4e3a\u4ec0\u4e48\u5269\u4f59\u5185\u5b58\u5f88\u591a\u7684\u60c5\u51b5\u4e0b\uff0c\u4e5f\u4f1a\u53d1\u751f Swap \u5462\uff1f<br \/>\n\u6b63\u662f\u5904\u7406\u5668\u7684 NUMA \uff08Non-Uniform Memory Access\uff09\u67b6\u6784\u5bfc\u81f4\u7684\u3002<\/p>\n<h2>1\u3001NUMA<\/h2>\n<p>\u5728 NUMA \u67b6\u6784\u4e0b\uff0c\u591a\u4e2a\u5904\u7406\u5668\u88ab\u5212\u5206\u5230\u4e0d\u540c Node \u4e0a\uff0c\u4e14\u6bcf\u4e2a Node \u90fd\u62e5\u6709\u81ea\u5df1\u7684\u672c\u5730\u5185\u5b58\u7a7a\u95f4\u3002\u800c\u540c\u4e00\u4e2a Node \u5185\u90e8\u7684\u5185\u5b58\u7a7a\u95f4\uff0c\u5b9e\u9645\u4e0a\u53c8\u53ef\u4ee5\u8fdb\u4e00\u6b65\u5206\u4e3a\u4e0d\u540c\u7684\u5185\u5b58\u57df\uff08Zone\uff09\uff0c\u6bd4\u5982\u76f4\u63a5\u5185\u5b58\u8bbf\u95ee\u533a\uff08DMA\uff09\u3001\u666e\u901a\u5185\u5b58\u533a\uff08NORMAL\uff09\u3001\u4f2a\u5185\u5b58\u533a\uff08MOVABLE\uff09\u7b49\uff0c\u5982\u4e0b\u56fe\u6240\u793a\uff1a<br \/>\n<div class='fancybox-wrapper lazyload-container-unload' data-fancybox='post-images' href='https:\/\/egonlin.com\/wp-content\/uploads\/2022\/10\/image-1666248204885.png'><img class=\"lazyload lazyload-style-2\" src=\"data:image\/svg+xml;base64,PCEtLUFyZ29uTG9hZGluZy0tPgo8c3ZnIHdpZHRoPSIxIiBoZWlnaHQ9IjEiIHhtbG5zPSJodHRwOi8vd3d3LnczLm9yZy8yMDAwL3N2ZyIgc3Ryb2tlPSIjZmZmZmZmMDAiPjxnPjwvZz4KPC9zdmc+\"  data-original=\"https:\/\/egonlin.com\/wp-content\/uploads\/2022\/10\/image-1666248204885.png\" src=\"data:image\/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAYAAAAfFcSJAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsQAAA7EAZUrDhsAAAANSURBVBhXYzh8+PB\/AAffA0nNPuCLAAAAAElFTkSuQmCC\" alt=\"file\" \/><\/div><\/p>\n<p>\u65e2\u7136 NUMA \u67b6\u6784\u4e0b\u7684\u6bcf\u4e2a Node \u90fd\u6709\u81ea\u5df1\u7684\u672c\u5730\u5185\u5b58\u7a7a\u95f4\uff0c\u90a3\u4e48\uff0c\u5728\u5206\u6790\u5185\u5b58\u7684\u4f7f\u7528\u65f6\uff0c\u6211\u4eec\u4e5f\u5e94\u8be5\u9488\u5bf9\u6bcf\u4e2a Node \u5355\u72ec\u5206\u6790\u3002<br \/>\nnumactl \u547d\u4ee4\uff0c\u6765\u67e5\u770b\u5904\u7406\u5668\u5728 Node \u7684\u5206\u5e03\u60c5\u51b5\uff0c\u4ee5\u53ca\u6bcf\u4e2a Node \u7684\u5185\u5b58\u4f7f\u7528\u60c5\u51b5\u3002<\/p>\n<pre><code>$ numactl --hardwareavailable: 1 nodes (0)node 0 cpus: 0 1node 0 size: 7977 MBnode 0 free: 4416 MB...<\/code><\/pre>\n<p>\u8f93\u51fa\u4fe1\u606f\u4e2d\uff0c\u7cfb\u7edf\u4e2d\u53ea\u6709\u4e00\u4e2aNode 0 \uff0c\u800c\u4e14\u7f16\u53f7\u4e3a 0 \u548c 1 \u7684\u4e24\u4e2a CPU\uff0c \u90fd\u4f4d\u4e8e Node 0 \u4e0a\u3002\u53e6\u5916\uff0cNode 0 \u7684\u5185\u5b58\u5927\u5c0f\u4e3a 7977 MB\uff0c\u5269\u4f59\u5185\u5b58\u4e3a 4416 MB\u3002<\/p>\n<h2>2\u3001\u4e0eswap\u7684\u5173\u7cfb<\/h2>\n<p>\u4e09\u4e2a\u5185\u5b58\u9608\u503c\uff08\u9875\u6700\u5c0f\u9608\u503c\u3001\u9875\u4f4e\u9608\u503c\u548c\u9875\u9ad8\u9608\u503c\uff09\uff0c\u90fd\u53ef\u4ee5\u901a\u8fc7\u5185\u5b58\u57df\u5728 proc \u6587\u4ef6\u7cfb\u7edf\u4e2d\u7684\u63a5\u53e3 \/proc\/zoneinfo \u6765\u67e5\u770b\u3002<br \/>\n\u6bd4\u5982\uff0c\u4e0b\u9762\u5c31\u662f\u4e00\u4e2a \/proc\/zoneinfo \u6587\u4ef6\u7684\u5185\u5bb9\u793a\u4f8b\uff1a<\/p>\n<pre><code>$ cat \/proc\/zoneinfo\n...\nNode 0, zone   Normal\n pages free     227894\n       min      14896\n       low      18620\n       high     22344\n...\n     nr_free_pages 227894\n     nr_zone_inactive_anon 11082\n     nr_zone_active_anon 14024\n     nr_zone_inactive_file 539024\n     nr_zone_active_file 923986\n...<\/code><\/pre>\n<ul>\n<li>pages \u5904\u7684 min\u3001low\u3001high\uff0c\u5c31\u662f\u4e0a\u9762\u63d0\u5230\u7684\u4e09\u4e2a\u5185\u5b58\u9608\u503c\uff0c\u800c free \u662f\u5269\u4f59\u5185\u5b58\u9875\u6570\uff0c\u5b83\u8ddf\u540e\u9762\u7684 nr_free_pages \u76f8\u540c\u3002<\/li>\n<li>nr_zone_active_anon \u548c nr_zone_inactive_anon\uff0c\u5206\u522b\u662f\u6d3b\u8dc3\u548c\u975e\u6d3b\u8dc3\u7684\u533f\u540d\u9875\u6570\u3002<\/li>\n<li>nr_zone_active_file \u548c nr_zone_inactive_file\uff0c\u5206\u522b\u662f\u6d3b\u8dc3\u548c\u975e\u6d3b\u8dc3\u7684\u6587\u4ef6\u9875\u6570\u3002<br \/>\n\u4ece\u8fd9\u4e2a\u8f93\u51fa\u7ed3\u679c\u53ef\u4ee5\u53d1\u73b0\uff0c\u5269\u4f59\u5185\u5b58\u8fdc\u5927\u4e8e\u9875\u9ad8\u9608\u503c\uff0c\u6240\u4ee5\u6b64\u65f6\u7684 kswapd0 \u4e0d\u4f1a\u56de\u6536\u5185\u5b58\u3002<\/li>\n<\/ul>\n<p>\u5f53\u7136\uff0c\u67d0\u4e2a Node \u5185\u5b58\u4e0d\u8db3\u65f6\uff0c\u7cfb\u7edf\u53ef\u4ee5\u4ece\u5176\u4ed6 Node \u5bfb\u627e\u7a7a\u95f2\u5185\u5b58\uff0c\u4e5f\u53ef\u4ee5\u4ece\u672c\u5730\u5185\u5b58\u4e2d\u56de\u6536\u5185\u5b58\u3002\u5177\u4f53\u9009\u54ea\u79cd\u6a21\u5f0f\uff0c\u53ef\u4ee5\u901a\u8fc7 \/proc\/sys\/vm\/zone_reclaim_mode \u6765\u8c03\u6574\u3002\u5b83\u652f\u6301\u4ee5\u4e0b\u51e0\u4e2a\u9009\u9879\uff1a<br \/>\n\u9ed8\u8ba4\u7684 0 ,\u8868\u793a\u65e2\u53ef\u4ee5\u4ece\u5176\u4ed6 Node \u5bfb\u627e\u7a7a\u95f2\u5185\u5b58\uff0c\u4e5f\u53ef\u4ee5\u4ece\u672c\u5730\u56de\u6536\u5185\u5b58\u3002<\/p>\n<p>1\u30012\u30014 \u90fd\u8868\u793a\u53ea\u56de\u6536\u672c\u5730\u5185\u5b58\uff0c2 \u8868\u793a\u53ef\u4ee5\u56de\u5199\u810f\u6570\u636e\u56de\u6536\u5185\u5b58\uff0c4 \u8868\u793a\u53ef\u4ee5\u7528 Swap \u65b9\u5f0f\u56de\u6536\u5185\u5b58\u3002<\/p>\n<h1>\u4e94\u3001Swap\u4f7f\u7528\u9ad8\u5b9a\u4f4d\u5206\u6790<\/h1>\n<p>\u5f00\u542f Swap \u540e\uff0c<\/p>\n<p>1\u3001\/proc\/sys\/vm\/min_free_kbytes \uff0c\u6765\u8c03\u6574\u7cfb\u7edf\u5b9a\u671f\u56de\u6536\u5185\u5b58\u7684\u9608\u503c<br \/>\n2\u3001 \/proc\/sys\/vm\/swappiness \uff0c\u6765\u8c03\u6574\u6587\u4ef6\u9875\u548c\u533f\u540d\u9875\u7684\u56de\u6536\u503e\u5411\u3002<br \/>\n\u90a3\u4e48\uff0c\u5f53 Swap \u4f7f\u7528\u5347\u9ad8\u65f6\uff0c\u8981\u5982\u4f55\u5b9a\u4f4d\u548c\u5206\u6790\u5462\uff1f\u5982\u4e0b\u6848\u4f8b\uff1a<br \/>\nfree \u547d\u4ee4\uff0c\u67e5\u770b Swap \u7684\u4f7f\u7528\u60c5\u51b5\u3002\u82e5\u770b\u5230\uff0cSwap \u7684\u5927\u5c0f\u662f 0\uff0c\u8fd9\u8bf4\u660e\u673a\u5668\u6ca1\u6709\u914d\u7f6e Swap\u3002<br \/>\n\u914d\u7f6e\u3001\u5f00\u542f Swap\uff1a\u8981\u6e05\u695a\uff0cLinux \u672c\u8eab\u652f\u6301\u4e24\u79cd\u7c7b\u578b\u7684 Swap\uff0c\u5373 Swap \u5206\u533a\u548c Swap \u6587\u4ef6\u3002\u4ee5 Swap \u6587\u4ef6\u4e3a\u4f8b\uff1a<\/p>\n<pre><code># \u521b\u5efaSwap\u6587\u4ef6\uff0cSwap \u6587\u4ef6\u7684\u5927\u5c0f\u4e3a 8GB\n$ fallocate -l 8G \/mnt\/swapfile\n# \u4fee\u6539\u6743\u9650\u53ea\u6709\u6839\u7528\u6237\u53ef\u4ee5\u8bbf\u95ee\n$ chmod 600 \/mnt\/swapfile\n# \u914d\u7f6eSwap\u6587\u4ef6\n$ mkswap \/mnt\/swapfile\n# \u5f00\u542fSwap\n$ swapon \/mnt\/swapfile<\/code><\/pre>\n<p>3\u3001\u6267\u884c free \u547d\u4ee4\uff0c\u786e\u8ba4 Swap \u914d\u7f6e\u6210\u529f\uff0cfree \u8f93\u51fa\u4e2d\uff0cSwap \u7a7a\u95f4\u4ee5\u53ca\u5269\u4f59\u7a7a\u95f4\u90fd\u4ece 0 \u53d8\u6210\u4e86 8GB\uff0c\u8bf4\u660e Swap \u5df2\u7ecf\u6b63\u5e38\u5f00\u542f\u3002<\/p>\n<p>4\u3001dd \u547d\u4ee4\uff0c\u6a21\u62df\u5927\u6587\u4ef6\u7684\u8bfb\u53d6<\/p>\n<pre><code># \u5199\u5165\u7a7a\u8bbe\u5907\uff0c\u5b9e\u9645\u4e0a\u53ea\u6709\u78c1\u76d8\u7684\u8bfb\u8bf7\u6c42$ dd if=\/dev\/sda1 of=\/dev\/null bs=1G count=2048<\/code><\/pre>\n<p>5\u3001\u8fd0\u884c sar \u547d\u4ee4\uff0c\u67e5\u770b\u5185\u5b58\u5404\u4e2a\u6307\u6807\u7684\u53d8\u5316\u60c5\u51b5<\/p>\n<pre><code># \u95f4\u96941\u79d2\u8f93\u51fa\u4e00\u7ec4\u6570\u636e# -r\u8868\u793a\u663e\u793a\u5185\u5b58\u4f7f\u7528\u60c5\u51b5\uff0c-S\u8868\u793a\u663e\u793aSwap\u4f7f\u7528\u60c5\u51b5$ sar -r -S 104:39:56    kbmemfree   kbavail kbmemused  %memused kbbuffers  kbcached  kbcommit   %commit  kbactive   kbinact   kbdirty04:39:57      6249676   6839824   1919632     23.50    740512     67316   1691736     10.22    815156    841868         404:39:56    kbswpfree kbswpused  %swpused  kbswpcad   %swpcad04:39:57      8388604         0      0.00         0      0.0004:39:57    kbmemfree   kbavail kbmemused  %memused kbbuffers  kbcached  kbcommit   %commit  kbactive   kbinact   kbdirty04:39:58      6184472   6807064   1984836     24.30    772768     67380   1691736     10.22    847932    874224        2004:39:57    kbswpfree kbswpused  %swpused  kbswpcad   %swpcad04:39:58      8388604         0      0.00         0      0.00\u202604:44:06    kbmemfree   kbavail kbmemused  %memused kbbuffers  kbcached  kbcommit   %commit  kbactive   kbinact   kbdirty04:44:07       152780   6525716   8016528     98.13   6530440     51316   1691736     10.22    867124   6869332         004:44:06    kbswpfree kbswpused  %swpused  kbswpcad   %swpcad04:44:07      8384508      4096      0.05        52      1.27<\/code><\/pre>\n<p>\u53ef\u4ee5\u770b\u5230\uff0csar \u7684\u8f93\u51fa\u7ed3\u679c\u662f\u4e24\u4e2a\u8868\u683c\uff0c\u7b2c\u4e00\u4e2a\u8868\u683c\u8868\u793a\u5185\u5b58\u7684\u4f7f\u7528\u60c5\u51b5\uff0c\u7b2c\u4e8c\u4e2a\u8868\u683c\u8868\u793a Swap \u7684\u4f7f\u7528\u60c5\u51b5\u3002\u5176\u4e2d\uff0c\u5404\u4e2a\u6307\u6807\u540d\u79f0\u524d\u9762\u7684 kb \u524d\u7f00\uff0c\u8868\u793a\u8fd9\u4e9b\u6307\u6807\u7684\u5355\u4f4d\u662f KB\u3002<\/p>\n<p>\u53bb\u6389\u524d\u7f00\u540e\uff0c\u5927\u90e8\u5206\u6307\u6807\u90fd\u5df2\u7ecf\u89c1\u8fc7\u4e86\uff0c\u5269\u4e0b\u7684\u51e0\u4e2a\u65b0\u51fa\u73b0\u7684\u6307\u6807\uff0c<br \/>\nkbcommit\uff0c\u8868\u793a\u5f53\u524d\u7cfb\u7edf\u8d1f\u8f7d\u9700\u8981\u7684\u5185\u5b58\u3002\u5b83\u5b9e\u9645\u4e0a\u662f\u4e3a\u4e86\u4fdd\u8bc1\u7cfb\u7edf\u5185\u5b58\u4e0d\u6ea2\u51fa\uff0c\u5bf9\u9700\u8981\u5185\u5b58\u7684\u4f30\u8ba1\u503c\u3002%commit\uff0c\u5c31\u662f\u8fd9\u4e2a\u503c\u76f8\u5bf9\u603b\u5185\u5b58\u7684\u767e\u5206\u6bd4\u3002<\/p>\n<pre><code>kbactive\uff0c\u8868\u793a\u6d3b\u8dc3\u5185\u5b58\uff0c\u4e5f\u5c31\u662f\u6700\u8fd1\u4f7f\u7528\u8fc7\u7684\u5185\u5b58\uff0c\u4e00\u822c\u4e0d\u4f1a\u88ab\u7cfb\u7edf\u56de\u6536\u3002\nkbinact\uff0c\u8868\u793a\u975e\u6d3b\u8dc3\u5185\u5b58\uff0c\u4e5f\u5c31\u662f\u4e0d\u5e38\u8bbf\u95ee\u7684\u5185\u5b58\uff0c\u6709\u53ef\u80fd\u4f1a\u88ab\u7cfb\u7edf\u56de\u6536\u3002<\/code><\/pre>\n<p>\u6e05\u695a\u4e86\u754c\u9762\u6307\u6807\u7684\u542b\u4e49\u540e\uff0c\u7ed3\u5408\u5177\u4f53\u6570\u503c\uff0c\u6765\u5206\u6790\u76f8\u5173\u7684\u73b0\u8c61\u3002\u53ef\u4ee5\u6e05\u695a\u5730\u770b\u5230\uff0c\u603b\u7684\u5185\u5b58\u4f7f\u7528\u7387\uff08%memused\uff09\u5728\u4e0d\u65ad\u589e\u957f\uff0c\u4ece\u5f00\u59cb\u7684 23% \u4e00\u76f4\u957f\u5230\u4e86 98%\uff0c\u5e76\u4e14\u4e3b\u8981\u5185\u5b58\u90fd\u88ab\u7f13\u51b2\u533a\uff08kbbuffers\uff09\u5360\u7528\u3002\u5177\u4f53\u6765\u8bf4\uff1a<br \/>\n\u521a\u5f00\u59cb\uff0c\u5269\u4f59\u5185\u5b58\uff08kbmemfree\uff09\u4e0d\u65ad\u51cf\u5c11\uff0c\u800c\u7f13\u51b2\u533a\uff08kbbuffers\uff09\u5219\u4e0d\u65ad\u589e\u5927\uff0c\u7531\u6b64\u53ef\u77e5\uff0c\u5269\u4f59\u5185\u5b58\u4e0d\u65ad\u5206\u914d\u7ed9\u4e86\u7f13\u51b2\u533a\u3002<br \/>\n\u4e00\u6bb5\u65f6\u95f4\u540e\uff0c\u5269\u4f59\u5185\u5b58\u5df2\u7ecf\u5f88\u5c0f\uff0c\u800c\u7f13\u51b2\u533a\u5360\u7528\u4e86\u5927\u90e8\u5206\u5185\u5b58\u3002\u8fd9\u65f6\u5019\uff0cSwap \u7684\u4f7f\u7528\u5f00\u59cb\u9010\u6e10\u589e\u5927\uff0c\u7f13\u51b2\u533a\u548c\u5269\u4f59\u5185\u5b58\u5219\u53ea\u5728\u5c0f\u8303\u56f4\u5185\u6ce2\u52a8\u3002<br \/>\n6\u3001\u8fd0\u884c\u4e0b\u9762\u7684 cachetop \u547d\u4ee4\uff0c\u89c2\u5bdf\u7f13\u5b58\u7684\u4f7f\u7528\u60c5\u51b5\uff1a<\/p>\n<pre><code>$ cachetop 5\n12:28:28 Buffers MB: 6349 \/ Cached MB: 87 \/ Sort: HITS \/ Order: ascending\nPID      UID      CMD              HITS     MISSES   DIRTIES  READ_HIT%  WRITE_HIT%\n   18280 root     python                 22        0        0     100.0%       0.0%\n   18279 root     dd                  41088    41022        0      50.0%      50.0%<\/code><\/pre>\n<p>\u901a\u8fc7 cachetop \u7684\u8f93\u51fa\uff0c\u6211\u4eec\u770b\u5230\uff0cdd \u8fdb\u7a0b\u7684\u8bfb\u5199\u8bf7\u6c42\u53ea\u6709 50% \u7684\u547d\u4e2d\u7387\uff0c\u5e76\u4e14\u672a\u547d\u4e2d\u7684\u7f13\u5b58\u9875\u6570\uff08MISSES\uff09\u4e3a 41022\uff08\u5355\u4f4d\u662f\u9875\uff09\u3002\u8fd9\u8bf4\u660e\uff0c\u6b63\u662f\u6848\u4f8b\u5f00\u59cb\u65f6\u8fd0\u884c\u7684 dd\uff0c\u5bfc\u81f4\u4e86\u7f13\u51b2\u533a\u4f7f\u7528\u5347\u9ad8\u3002<br \/>\n7\u3001\u4e3a\u4ec0\u4e48 Swap \u4e5f\u8ddf\u7740\u5347\u9ad8\u4e86\u5462\uff1f\u76f4\u89c2\u6765\u8bf4\uff0c\u7f13\u51b2\u533a\u5360\u4e86\u7cfb\u7edf\u7edd\u5927\u90e8\u5206\u5185\u5b58\uff0c\u8fd8\u5c5e\u4e8e\u53ef\u56de\u6536\u5185\u5b58\uff0c\u5185\u5b58\u4e0d\u591f\u7528\u65f6\uff0c\u4e0d\u5e94\u8be5\u5148\u56de\u6536\u7f13\u51b2\u533a\u5417\uff1f<br \/>\n\u8fdb\u4e00\u6b65\u901a\u8fc7 \/proc\/zoneinfo \uff0c\u89c2\u5bdf\u5269\u4f59\u5185\u5b58\u3001\u5185\u5b58\u9608\u503c\u4ee5\u53ca\u533f\u540d\u9875\u548c\u6587\u4ef6\u9875\u7684\u6d3b\u8dc3\u60c5\u51b5\u3002<\/p>\n<p>\u89c2\u5bdf \/proc\/zoneinfo \u4e2d\u8fd9\u51e0\u4e2a\u6307\u6807\u7684\u53d8\u5316\u60c5\u51b5\uff1a<\/p>\n<pre><code># -d \u8868\u793a\u9ad8\u4eae\u53d8\u5316\u7684\u5b57\u6bb5\n# -A \u8868\u793a\u4ec5\u663e\u793aNormal\u884c\u4ee5\u53ca\u4e4b\u540e\u768415\u884c\u8f93\u51fa\n$ watch -d grep -A 15 &#039;Normal&#039; \/proc\/zoneinfo\nNode 0, zone   Normal\n  pages free     21328\n        min      14896\n        low      18620\n        high     22344\n        spanned  1835008\n        present  1835008\n        managed  1796710\n        protection: (0, 0, 0, 0, 0)\n      nr_free_pages 21328\n      nr_zone_inactive_anon 79776\n      nr_zone_active_anon 206854\n      nr_zone_inactive_file 918561\n      nr_zone_active_file 496695\n      nr_zone_unevictable 2251\n      nr_zone_write_pending 0<\/code><\/pre>\n<p>\u53ef\u4ee5\u53d1\u73b0\uff0c\u5269\u4f59\u5185\u5b58\uff08pages_free\uff09\u5728\u4e00\u4e2a\u5c0f\u8303\u56f4\u5185\u4e0d\u505c\u5730\u6ce2\u52a8\u3002\u5f53\u5b83\u5c0f\u4e8e\u9875\u4f4e\u9608\u503c\uff08pages_low) \u65f6\uff0c\u53c8\u4f1a\u7a81\u7136\u589e\u5927\u5230\u4e00\u4e2a\u5927\u4e8e\u9875\u9ad8\u9608\u503c\uff08pages_high\uff09\u7684\u503c\u3002<\/p>\n<p>\u7ed3\u5408\u521a\u521a\u7528 sar \u770b\u5230\u7684\u5269\u4f59\u5185\u5b58\u548c\u7f13\u51b2\u533a\u7684\u53d8\u5316\u60c5\u51b5\uff0c\u6211\u4eec\u53ef\u4ee5\u63a8\u5bfc\u51fa\uff0c\u5269\u4f59\u5185\u5b58\u548c\u7f13\u51b2\u533a\u7684\u6ce2\u52a8\u53d8\u5316\uff0c\u6b63\u662f\u7531\u4e8e\u5185\u5b58\u56de\u6536\u548c\u7f13\u5b58\u518d\u6b21\u5206\u914d\u7684\u5faa\u73af\u5f80\u590d\u3002<\/p>\n<p>\u5f53\u5269\u4f59\u5185\u5b58\u5c0f\u4e8e\u9875\u4f4e\u9608\u503c\u65f6\uff0c\u7cfb\u7edf\u4f1a\u56de\u6536\u4e00\u4e9b\u7f13\u5b58\u548c\u533f\u540d\u5185\u5b58\uff0c\u4f7f\u5269\u4f59\u5185\u5b58\u589e\u5927\u3002\u5176\u4e2d\uff0c\u7f13\u5b58\u7684\u56de\u6536\u5bfc\u81f4 sar \u4e2d\u7684\u7f13\u51b2\u533a\u51cf\u5c0f\uff0c\u800c\u533f\u540d\u5185\u5b58\u7684\u56de\u6536\u5bfc\u81f4\u4e86 Swap \u7684\u4f7f\u7528\u589e\u5927\u3002<br \/>\n\u7d27\u63a5\u7740\uff0c\u7531\u4e8e dd \u8fd8\u5728\u7ee7\u7eed\uff0c\u5269\u4f59\u5185\u5b58\u53c8\u4f1a\u91cd\u65b0\u5206\u914d\u7ed9\u7f13\u5b58\uff0c\u5bfc\u81f4\u5269\u4f59\u5185\u5b58\u51cf\u5c11\uff0c\u7f13\u51b2\u533a\u589e\u5927\u3002<\/p>\n<p>8\u3001\u5982\u679c\u591a\u6b21\u8fd0\u884c dd \u548c sar\uff0c\u4f60\u53ef\u80fd\u4f1a\u53d1\u73b0\uff0c\u5728\u591a\u6b21\u7684\u5faa\u73af\u91cd\u590d\u4e2d\uff0c\u6709\u65f6\u5019\u662f Swap \u7528\u5f97\u6bd4\u8f83\u591a\uff0c\u6709\u65f6\u5019 Swap \u5f88\u5c11\uff0c\u53cd\u800c\u7f13\u51b2\u533a\u7684\u6ce2\u52a8\u66f4\u5927\u3002<\/p>\n<p>\u6362\u53e5\u8bdd\u8bf4\uff0c\u7cfb\u7edf\u56de\u6536\u5185\u5b58\u65f6\uff0c\u6709\u65f6\u5019\u4f1a\u56de\u6536\u66f4\u591a\u7684\u6587\u4ef6\u9875\uff0c\u6709\u65f6\u5019\u53c8\u56de\u6536\u4e86\u66f4\u591a\u7684\u533f\u540d\u9875\u3002<\/p>\n<p>\u67e5\u770b swappiness \u7684\u914d\u7f6e\uff1a<br \/>\n$ cat \/proc\/sys\/vm\/swappiness60<\/p>\n<p>swappiness \u663e\u793a\u7684\u662f\u9ed8\u8ba4\u503c 60\uff0c\u8fd9\u662f\u4e00\u4e2a\u76f8\u5bf9\u4e2d\u548c\u7684\u914d\u7f6e\uff0c\u6240\u4ee5\u7cfb\u7edf\u4f1a\u6839\u636e\u5b9e\u9645\u8fd0\u884c\u60c5\u51b5\uff0c\u9009\u62e9\u5408\u9002\u7684\u56de\u6536\u7c7b\u578b\uff0c\u6bd4\u5982\u56de\u6536\u4e0d\u6d3b\u8dc3\u7684\u533f\u540d\u9875\uff0c\u6216\u8005\u4e0d\u6d3b\u8dc3\u7684\u6587\u4ef6\u9875\u3002<\/p>\n<p>9\u3001Swap \u6362\u51fa\u7684\u662f\u54ea\u4e9b\u8fdb\u7a0b\u7684\u5185\u5b58\uff1f<br \/>\nproc \u6587\u4ef6\u7cfb\u7edf\uff0c\u7528\u6765\u67e5\u770b\u8fdb\u7a0b Swap \u6362\u51fa\u7684\u865a\u62df\u5185\u5b58\u5927\u5c0f\uff0c\u5b83\u4fdd\u5b58\u5728 \/proc\/pid\/status \u4e2d\u7684 VmSwap \u4e2d\u3002<br \/>\n\u67e5\u770b\u4f7f\u7528 Swap \u6700\u591a\u7684\u8fdb\u7a0b\uff1a<\/p>\n<pre><code># \u6309VmSwap\u4f7f\u7528\u91cf\u5bf9\u8fdb\u7a0b\u6392\u5e8f\uff0c\u8f93\u51fa\u8fdb\u7a0b\u540d\u79f0\u3001\u8fdb\u7a0bID\u4ee5\u53caSWAP\u7528\u91cf$ for file in \/proc\/*\/status ; do awk &#039;\/VmSwap|Name|^Pid\/{printf $2 &quot; &quot; $3}END{ print &quot;&quot;}&#039; $file; done | sort -k 3 -n -r | headdockerd 2226 10728 kBdocker-containe 2251 8516 kBsnapd 936 4020 kBnetworkd-dispat 911 836 kBpolkitd 1004 44 kB<\/code><\/pre>\n<p>\u4ece\u8fd9\u91cc\u4f60\u53ef\u4ee5\u770b\u5230\uff0c\u4f7f\u7528 Swap \u6bd4\u8f83\u591a\u7684\u662f dockerd \u548c docker-containe \u8fdb\u7a0b\uff0c\u6240\u4ee5\uff0c\u5f53 dockerd \u518d\u6b21\u8bbf\u95ee\u8fd9\u4e9b\u6362\u51fa\u5230\u78c1\u76d8\u7684\u5185\u5b58\u65f6\uff0c\u4e5f\u4f1a\u6bd4\u8f83\u6162\u3002<\/p>\n<p>\u8fd9\u4e5f\u8bf4\u660e\u4e86\u4e00\u70b9\uff0c\u867d\u7136\u7f13\u5b58\u5c5e\u4e8e\u53ef\u56de\u6536\u5185\u5b58\uff0c\u4f46\u5728\u7c7b\u4f3c\u5927\u6587\u4ef6\u62f7\u8d1d\u8fd9\u7c7b\u573a\u666f\u4e0b\uff0c\u7cfb\u7edf\u8fd8\u662f\u4f1a\u7528 Swap \u673a\u5236\u6765\u56de\u6536\u533f\u540d\u5185\u5b58\uff0c\u800c\u4e0d\u4ec5\u4ec5\u662f\u56de\u6536\u5360\u7528\u7edd\u5927\u90e8\u5206\u5185\u5b58\u7684\u6587\u4ef6\u9875\u3002<\/p>\n<h1>\u516d\u3001\u603b\u7ed3<\/h1>\n<pre><code>\u5728\u5185\u5b58\u8d44\u6e90\u7d27\u5f20\u65f6\uff0cLinux \u4f1a\u901a\u8fc7 Swap \uff0c\u628a\u4e0d\u5e38\u8bbf\u95ee\u7684\u533f\u540d\u9875\u6362\u51fa\u5230\u78c1\u76d8\u4e2d\uff0c\u4e0b\u6b21\u8bbf\u95ee\u7684\u65f6\u5019\u518d\u4ece\u78c1\u76d8\u6362\u5165\u5230\u5185\u5b58\u4e2d\u6765\u3002\u53ef\u4ee5\u8bbe\u7f6e \/proc\/sys\/vm\/min_free_kbytes\uff0c\u6765\u8c03\u6574\u7cfb\u7edf\u5b9a\u671f\u56de\u6536\u5185\u5b58\u7684\u9608\u503c\uff1b\u4e5f\u53ef\u4ee5\u8bbe\u7f6e \/proc\/sys\/vm\/swappiness\uff0c\u6765\u8c03\u6574\u6587\u4ef6\u9875\u548c\u533f\u540d\u9875\u7684\u56de\u6536\u503e\u5411\u3002\n\u5f53 Swap \u53d8\u9ad8\u65f6\uff0c\u4f60\u53ef\u4ee5\u7528 sar\u3001\/proc\/zoneinfo\u3001\/proc\/pid\/status \u7b49\u65b9\u6cd5\uff0c\u67e5\u770b\u7cfb\u7edf\u548c\u8fdb\u7a0b\u7684\u5185\u5b58\u4f7f\u7528\u60c5\u51b5\uff0c\u8fdb\u800c\u627e\u51fa Swap \u5347\u9ad8\u7684\u6839\u6e90\u548c\u53d7\u5f71\u54cd\u7684\u8fdb\u7a0b\u3002\n\u53cd\u8fc7\u6765\u8bf4\uff0c\u901a\u5e38\u964d\u4f4e Swap \u7684\u4f7f\u7528\uff0c\u53ef\u4ee5\u63d0\u9ad8\u7cfb\u7edf\u7684\u6574\u4f53\u6027\u80fd\u3002\u8981\u600e\u4e48\u505a\u5462\uff1f\u51e0\u79cd\u5e38\u89c1\u7684\u964d\u4f4e\u65b9\u6cd5\u3002\n\u7981\u6b62 Swap\uff0c\u73b0\u5728\u670d\u52a1\u5668\u7684\u5185\u5b58\u8db3\u591f\u5927\uff0c\u6240\u4ee5\u9664\u975e\u6709\u5fc5\u8981\uff0c\u7981\u7528 Swap \u5c31\u53ef\u4ee5\u4e86\u3002\u968f\u7740\u4e91\u8ba1\u7b97\u7684\u666e\u53ca\uff0c\u5927\u90e8\u5206\u4e91\u5e73\u53f0\u4e2d\u7684\u865a\u62df\u673a\u90fd\u9ed8\u8ba4\u7981\u6b62 Swap\u3002\n\u5982\u679c\u5b9e\u5728\u9700\u8981\u7528\u5230 Swap\uff0c\u53ef\u4ee5\u5c1d\u8bd5\u964d\u4f4e swappiness \u7684\u503c\uff0c\u51cf\u5c11\u5185\u5b58\u56de\u6536\u65f6 Swap \u7684\u4f7f\u7528\u503e\u5411\u3002\n\u54cd\u5e94\u5ef6\u8fdf\u654f\u611f\u7684\u5e94\u7528\uff0c\u5982\u679c\u5b83\u4eec\u53ef\u80fd\u5728\u5f00\u542f Swap \u7684\u670d\u52a1\u5668\u4e2d\u8fd0\u884c\uff0c\u4f60\u8fd8\u53ef\u4ee5\u7528\u5e93\u51fd\u6570 mlock() \u6216\u8005 mlockall() \u9501\u5b9a\u5185\u5b58\uff0c\u963b\u6b62\u5b83\u4eec\u7684\u5185\u5b58\u6362\u51fa\u3002<\/code><\/pre>\n","protected":false},"excerpt":{"rendered":"<p>\u4e00\u3001\u6587\u4ef6\u9875\u548c\u533f\u540d\u9875 1\u3001\u6587\u4ef6\u9875 \u5f53\u53d1\u751f\u4e86\u5185\u5b58\u6cc4\u6f0f\u65f6\uff0c\u6216\u8005\u8fd0\u884c\u4e86\u5927\u5185\u5b58\u7684\u5e94\u7528\u7a0b\u5e8f\uff0c\u5bfc\u81f4\u7cfb\u7edf\u7684\u5185\u5b58\u8d44\u6e90\u7d27\u5f20\u65f6\uff0c\u7cfb\u7edf [&hellip;]<\/p>\n","protected":false},"author":3,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":[],"categories":[2],"tags":[],"_links":{"self":[{"href":"https:\/\/egonlin.com\/index.php?rest_route=\/wp\/v2\/posts\/7605"}],"collection":[{"href":"https:\/\/egonlin.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/egonlin.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/egonlin.com\/index.php?rest_route=\/wp\/v2\/users\/3"}],"replies":[{"embeddable":true,"href":"https:\/\/egonlin.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=7605"}],"version-history":[{"count":0,"href":"https:\/\/egonlin.com\/index.php?rest_route=\/wp\/v2\/posts\/7605\/revisions"}],"wp:attachment":[{"href":"https:\/\/egonlin.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=7605"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/egonlin.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=7605"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/egonlin.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=7605"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}