{"id":53163,"date":"2025-08-12T02:24:31","date_gmt":"2025-08-11T18:24:31","guid":{"rendered":"https:\/\/www.wsisp.com\/helps\/53163.html"},"modified":"2025-08-12T02:24:31","modified_gmt":"2025-08-11T18:24:31","slug":"redis-%e5%86%85%e5%ad%98%e5%a4%a7%e9%a1%b5%ef%bc%88transparent-huge-pages-thp%ef%bc%89%e4%b8%8e%e5%86%99%e6%97%b6%e5%a4%8d%e5%88%b6%ef%bc%88cow%ef%bc%89%e6%80%a7%e8%83%bd%e5%85%a8%e8%a7%a3%ef%bc%9a","status":"publish","type":"post","link":"https:\/\/www.wsisp.com\/helps\/53163.html","title":{"rendered":"Redis \u5185\u5b58\u5927\u9875\uff08Transparent Huge Pages, THP\uff09\u4e0e\u5199\u65f6\u590d\u5236\uff08COW\uff09\u6027\u80fd\u5168\u89e3\uff1a\u539f\u7406\u3001\u6e90\u7801\u3001\u8c03\u4f18\u4e0e\u67b6\u6784\u8fdb\u9636"},"content":{"rendered":"<h2>Redis \u5185\u5b58\u5927\u9875&#xff08;Transparent Huge Pages, THP&#xff09;\u4e0e\u5199\u65f6\u590d\u5236&#xff08;COW&#xff09;\u6027\u80fd\u5168\u89e3&#xff1a;\u539f\u7406\u3001\u6e90\u7801\u3001\u8c03\u4f18\u4e0e\u67b6\u6784\u8fdb\u9636<\/h2>\n<p>Redis \u6027\u80fd\u74f6\u9888\u5e38\u89c1\u4e8e\u6301\u4e45\u5316\u65f6 fork \u64cd\u4f5c\u7684\u5ef6\u8fdf&#xff0c;\u4f46\u7cfb\u7edf\u7ea7\u201c\u5185\u5b58\u5927\u9875\u201d&#xff08;THP&#xff09;\u914d\u7f6e\u540c\u6837\u4f1a\u8ba9\u5199\u5165\u5ef6\u8fdf\u7a81\u53d1\u98d9\u5347\u3002\u672c\u6587\u5c06\u7cfb\u7edf\u5256\u6790 THP\/COW \u7684\u5e95\u5c42\u539f\u7406\u3001\u6d41\u7a0b\u6e90\u7801\u3001\u4f18\u7f3a\u70b9\u3001\u4e1a\u52a1\u573a\u666f\u4e0e\u4f18\u5316\u6280\u5de7&#xff0c;\u5e76\u7528\u6d41\u7a0b\u56fe\u4e0e\u6e90\u7801\u9010\u884c\u6ce8\u91ca\u52a9\u4f60\u77e5\u5176\u7136&#xff0c;\u66f4\u77e5\u5176\u6240\u4ee5\u7136\u3002<\/p>\n<hr \/>\n<h3>\u4e00\u3001\u4e3b\u6d41\u7a0b\u73af\u8282\u4e0e\u8bbe\u8ba1\u601d\u60f3<\/h3>\n<h4>1.1 \u5185\u5b58\u9875\u4e0e\u5927\u9875\u673a\u5236<\/h4>\n<ul>\n<li>\u8bbe\u8ba1\u76ee\u7684&#xff1a;\u64cd\u4f5c\u7cfb\u7edf\u4ee5\u201c\u9875\u201d\u4e3a\u5355\u4f4d\u7ba1\u7406\u5185\u5b58&#xff0c;\u63d0\u5347\u5206\u914d\u6548\u7387\u3002<\/li>\n<li>\u5e38\u89c4\u9875&#xff1a;4KB&#xff0c;\u7075\u6d3b\u5206\u914d&#xff0c;\u9002\u5408\u9ad8\u9891\u5c0f\u64cd\u4f5c\u3002<\/li>\n<li>\u5185\u5b58\u5927\u9875&#xff08;THP&#xff09;&#xff1a;2MB&#xff0c;\u51cf\u5c11\u9875\u8868\u9879&#xff0c;\u9002\u5408\u6279\u91cf\u5927\u6570\u636e\u573a\u666f\u3002<\/li>\n<li>Redis \u573a\u666f&#xff1a;\u9ad8\u9891\u8bfb\u5199&#xff0c;fork \u5b50\u8fdb\u7a0b\u505a\u6301\u4e45\u5316&#xff0c;\u9700\u4f4e\u5ef6\u8fdf\u3002<\/li>\n<\/ul>\n<p>flowchart LR<br \/>\n    MEM_REQ[\u8fdb\u7a0b\u8bf7\u6c42\u5206\u914d\u5185\u5b58] &#8211;&gt; THP_CHECK{THP\u542f\u7528&#xff1f;}<br \/>\n    THP_CHECK &#8211;&gt;|\u5426| SMALL_PAGE[4KB\u9875\u5206\u914d]<br \/>\n    THP_CHECK &#8211;&gt;|\u662f| HUGE_PAGE[2MB\u5927\u9875\u5206\u914d]<br \/>\n    SMALL_PAGE &#8211;&gt; FLEXIBLE[\u9875\u8868\u9879\u6570\u91cf\u591a\\\\n\u5206\u914d\u7075\u6d3b]<br \/>\n    HUGE_PAGE &#8211;&gt; COARSE[\u9875\u8868\u9879\u6570\u91cf\u5c11\\\\n\u5206\u914d\u7c97\u7c92\u5ea6]<\/p>\n<p>\u6216\u8005\u7528\u7ad6\u5411&#xff08;TD&#xff09;&#xff1a;<\/p>\n<p>  #mermaid-svg-1rTo58uGSsFI4doi {font-family:\\&#8221;trebuchet ms\\&#8221;,verdana,arial,sans-serif;font-size:16px;fill:#333;}#mermaid-svg-1rTo58uGSsFI4doi .error-icon{fill:#552222;}#mermaid-svg-1rTo58uGSsFI4doi .error-text{fill:#552222;stroke:#552222;}#mermaid-svg-1rTo58uGSsFI4doi .edge-thickness-normal{stroke-width:2px;}#mermaid-svg-1rTo58uGSsFI4doi .edge-thickness-thick{stroke-width:3.5px;}#mermaid-svg-1rTo58uGSsFI4doi .edge-pattern-solid{stroke-dasharray:0;}#mermaid-svg-1rTo58uGSsFI4doi .edge-pattern-dashed{stroke-dasharray:3;}#mermaid-svg-1rTo58uGSsFI4doi .edge-pattern-dotted{stroke-dasharray:2;}#mermaid-svg-1rTo58uGSsFI4doi .marker{fill:#333333;stroke:#333333;}#mermaid-svg-1rTo58uGSsFI4doi .marker.cross{stroke:#333333;}#mermaid-svg-1rTo58uGSsFI4doi svg{font-family:\\&#8221;trebuchet ms\\&#8221;,verdana,arial,sans-serif;font-size:16px;}#mermaid-svg-1rTo58uGSsFI4doi .label{font-family:\\&#8221;trebuchet ms\\&#8221;,verdana,arial,sans-serif;color:#333;}#mermaid-svg-1rTo58uGSsFI4doi .cluster-label text{fill:#333;}#mermaid-svg-1rTo58uGSsFI4doi .cluster-label span{color:#333;}#mermaid-svg-1rTo58uGSsFI4doi .label text,#mermaid-svg-1rTo58uGSsFI4doi span{fill:#333;color:#333;}#mermaid-svg-1rTo58uGSsFI4doi .node rect,#mermaid-svg-1rTo58uGSsFI4doi .node circle,#mermaid-svg-1rTo58uGSsFI4doi .node ellipse,#mermaid-svg-1rTo58uGSsFI4doi .node polygon,#mermaid-svg-1rTo58uGSsFI4doi .node path{fill:#ECECFF;stroke:#9370DB;stroke-width:1px;}#mermaid-svg-1rTo58uGSsFI4doi .node .label{text-align:center;}#mermaid-svg-1rTo58uGSsFI4doi .node.clickable{cursor:pointer;}#mermaid-svg-1rTo58uGSsFI4doi .arrowheadPath{fill:#333333;}#mermaid-svg-1rTo58uGSsFI4doi .edgePath .path{stroke:#333333;stroke-width:2.0px;}#mermaid-svg-1rTo58uGSsFI4doi .flowchart-link{stroke:#333333;fill:none;}#mermaid-svg-1rTo58uGSsFI4doi .edgeLabel{background-color:#e8e8e8;text-align:center;}#mermaid-svg-1rTo58uGSsFI4doi .edgeLabel rect{opacity:0.5;background-color:#e8e8e8;fill:#e8e8e8;}#mermaid-svg-1rTo58uGSsFI4doi .cluster rect{fill:#ffffde;stroke:#aaaa33;stroke-width:1px;}#mermaid-svg-1rTo58uGSsFI4doi .cluster text{fill:#333;}#mermaid-svg-1rTo58uGSsFI4doi .cluster span{color:#333;}#mermaid-svg-1rTo58uGSsFI4doi div.mermaidTooltip{position:absolute;text-align:center;max-width:200px;padding:2px;font-family:\\&#8221;trebuchet ms\\&#8221;,verdana,arial,sans-serif;font-size:12px;background:hsl(80, 100%, 96.2745098039%);border:1px solid #aaaa33;border-radius:2px;pointer-events:none;z-index:100;}#mermaid-svg-1rTo58uGSsFI4doi :root{&#8211;mermaid-font-family:\\&#8221;trebuchet ms\\&#8221;,verdana,arial,sans-serif;}<\/p>\n<p>         <span class=\"edgeLabel\"><\/span><\/p>\n<p>         <span class=\"edgeLabel\">\u5426<\/span><\/p>\n<p>         <span class=\"edgeLabel\">\u662f<\/span><\/p>\n<p>         <span class=\"edgeLabel\"><\/span><\/p>\n<p>         <span class=\"edgeLabel\"><\/span><\/p>\n<p>         <span class=\"nodeLabel\">\u8fdb\u7a0b\u8bf7\u6c42\u5206\u914d\u5185\u5b58<\/span><\/p>\n<p>         <span class=\"nodeLabel\">\u7cfb\u7edf\u662f\u5426\u542f\u7528THP?<\/span><\/p>\n<p>         <span class=\"nodeLabel\">\u5206\u914d4KB\u9875<\/span><\/p>\n<p>         <span class=\"nodeLabel\">\u5206\u914d2MB\u5927\u9875<\/span><\/p>\n<p>         <span class=\"nodeLabel\">\u9875\u8868\u9879\u591a\u5206\u914d\u7075\u6d3b<\/span><\/p>\n<p>         <span class=\"nodeLabel\">\u9875\u8868\u9879\u6570\u91cf\u5c11\u5206\u914d\u7c97\u7c92\u5ea6<\/span><\/p>\n<hr \/>\n<h3>\u4e8c\u3001THP\u5bf9Redis\u7684\u6027\u80fd\u5f71\u54cd\u4e0e\u4f18\u7f3a\u70b9\u5206\u6790<\/h3>\n<table>\n<tr>\u4f18\u70b9\u7f3a\u70b9&#xff08;\u5bf9Redis&#xff09;<\/tr>\n<tbody>\n<tr>\n<td>\u51cf\u5c11\u9875\u8868\u6570\u91cf&#xff0c;\u7ba1\u7406\u5f00\u9500\u4f4e<\/td>\n<td>\u5199\u65f6\u590d\u5236&#xff08;COW&#xff09;\u6210\u672c\u6781\u9ad8<\/td>\n<\/tr>\n<tr>\n<td>\u6279\u91cf\u6570\u636e\u573a\u666f\u5206\u914d\u5feb<\/td>\n<td>\u6301\u4e45\u5316 fork\/RDB\/AOF \u65f6\u5ef6\u8fdf\u5267\u589e<\/td>\n<\/tr>\n<tr>\n<td>\u5927\u6570\u636e\u5206\u6790\u9002\u7528<\/td>\n<td>\u9ad8\u9891\u5199\u5c0f\u6570\u636e\u6781\u4e0d\u9002\u7528<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h5>\u573a\u666f\u89e3\u6790<\/h5>\n<ul>\n<li>Redis\u6301\u4e45\u5316&#xff1a;fork\u65f6\u4e3b\u8fdb\u7a0b\u4e0e\u5b50\u8fdb\u7a0b\u5171\u4eab\u9875&#xff0c;\u5199\u65f6\u4ec5\u9700\u590d\u5236\u4fee\u6539\u90e8\u5206\u3002\u4f46\u542f\u7528THP\u540e&#xff0c;\u5373\u4f7f\u53ea\u519910B&#xff0c;\u4e5f\u9700\u590d\u5236\u6574\u4e2a2MB\u5927\u9875&#xff0c;\u5ef6\u8fdf\u653e\u5927512\u500d\u3002<\/li>\n<li>bigkey\u653e\u5927\u6548\u5e94&#xff1a;\u6dd8\u6c70\u6216\u4fee\u6539\u5927key\u65f6&#xff0c;\u9700\u590d\u5236\u591a\u4e2a\u5927\u9875&#xff0c;\u4e3b\u7ebf\u7a0b\u963b\u585e\u66f4\u4e25\u91cd\u3002<\/li>\n<\/ul>\n<hr \/>\n<h3>\u4e09\u3001\u4e3b\u6d41\u7a0b\u6e90\u7801\u8be6\u7ec6\u5256\u6790\u4e0e\u6ce8\u91ca<\/h3>\n<h4>3.1 COW\u89e6\u53d1\u6d41\u7a0b\u6838\u5fc3\u6e90\u7801&#xff08;\u4f2a\u4ee3\u7801\u7b80\u5316\u7248&#xff09;<\/h4>\n<p><span class=\"token comment\">\/\/ fork\u6301\u4e45\u5316\u4e3b\u6d41\u7a0b&#xff08;\u4f2a\u4ee3\u7801\u793a\u4f8b&#xff09;<\/span><br \/>\n<span class=\"token class-name\">pid_t<\/span> child_pid <span class=\"token operator\">&#061;<\/span> <span class=\"token function\">fork<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token comment\">\/\/ 1. fork\u51fa\u5b50\u8fdb\u7a0b&#xff0c;\u5f00\u59cbCOW\u5171\u4eab\u9875<\/span><br \/>\n<span class=\"token keyword\">if<\/span> <span class=\"token punctuation\">(<\/span>child_pid <span class=\"token operator\">&#061;&#061;<\/span> <span class=\"token number\">0<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token comment\">\/\/ 2. \u5b50\u8fdb\u7a0b\u53ea\u8bfb\u5feb\u7167&#xff0c;\u5199RDB\/AOF<\/span><br \/>\n    <span class=\"token function\">persist_memory_snapshot<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span> <span class=\"token keyword\">else<\/span> <span class=\"token punctuation\">{<\/span><br \/>\n    <span class=\"token comment\">\/\/ 3. \u4e3b\u8fdb\u7a0b\u7ee7\u7eed\u670d\u52a1<\/span><br \/>\n    <span class=\"token function\">handle_client_requests<\/span><span class=\"token punctuation\">(<\/span><span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n    <span class=\"token comment\">\/\/ 4. \u82e5\u4e3b\u8fdb\u7a0b\u4fee\u6539\u6570\u636e&#xff08;\u5982set&#xff09;&#xff0c;\u89e6\u53d1COW<\/span><br \/>\n    <span class=\"token function\">memcpy<\/span><span class=\"token punctuation\">(<\/span>new_page<span class=\"token punctuation\">,<\/span> old_page<span class=\"token punctuation\">,<\/span> page_size<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span> <span class=\"token comment\">\/\/ page_size\u53d7THP\u5f71\u54cd<\/span><br \/>\n    <span class=\"token function\">modify<\/span><span class=\"token punctuation\">(<\/span>new_page<span class=\"token punctuation\">,<\/span> data<span class=\"token punctuation\">)<\/span><span class=\"token punctuation\">;<\/span><br \/>\n<span class=\"token punctuation\">}<\/span><\/p>\n<h5>\u9010\u884c\u6ce8\u91ca<\/h5>\n<li>fork\u7cfb\u7edf\u8c03\u7528&#xff0c;\u5f00\u542fCOW\u673a\u5236<\/li>\n<li>\u5b50\u8fdb\u7a0b\u7528\u4e8e\u6301\u4e45\u5316&#xff0c;\u8bfb\u53d6\u5185\u5b58\u5feb\u7167<\/li>\n<li>\u4e3b\u8fdb\u7a0b\u7ee7\u7eed\u5904\u7406\u8bf7\u6c42<\/li>\n<li>\u4e3b\u8fdb\u7a0b\u5199\u6570\u636e\u65f6&#xff0c;COW\u89e6\u53d1\u2014\u2014\u590d\u5236\u6574\u9875&#xff08;THP\u4e0b\u662f2MB&#xff09;<\/li>\n<p>\u901f\u8bb0\u53e3\u8bc0<\/p>\n<p>\u201cfork\u5171\u4eab\u9875&#xff0c;\u5b50\u8bfb\u4e3b\u5199&#xff0c;COW\u89e6\u53d1&#xff0c;\u9875\u5168\u590d\u5236&#xff0c;THP\u653e\u5927\u5ef6\u8fdf\u3002\u201d<\/p>\n<hr \/>\n<h3>\u56db\u3001\u8c03\u8bd5\u4e0e\u4f18\u5316\u6280\u5de7<\/h3>\n<h4>4.1 \u68c0\u67e5\u4e0e\u5173\u95edTHP<\/h4>\n<h5>\u68c0\u67e5THP\u72b6\u6001<\/h5>\n<p><span class=\"token function\">cat<\/span> \/sys\/kernel\/mm\/transparent_hugepage\/enabled<br \/>\n<span class=\"token comment\"># [always] madvise never &#061;&gt; always\u4e3a\u542f\u7528&#xff0c;never\u4e3a\u5173\u95ed<\/span><\/p>\n<h5>\u4e34\u65f6\u5173\u95edTHP<\/h5>\n<p><span class=\"token builtin class-name\">echo<\/span> never <span class=\"token operator\">&gt;<\/span> \/sys\/kernel\/mm\/transparent_hugepage\/enabled<\/p>\n<h5>\u6c38\u4e45\u5173\u95edTHP<\/h5>\n<p><span class=\"token builtin class-name\">echo<\/span> <span class=\"token string\">&#039;echo never &gt; \/sys\/kernel\/mm\/transparent_hugepage\/enabled&#039;<\/span> <span class=\"token operator\">&gt;&gt;<\/span> \/etc\/rc.local<br \/>\n<span class=\"token function\">chmod<\/span> &#043;x \/etc\/rc.local<\/p>\n<h4>4.2 \u4e1a\u52a1\u573a\u666f\u4f18\u5316\u4e3e\u4f8b<\/h4>\n<ul>\n<li>\u9ad8\u9891\u5199\u5165\u4e1a\u52a1&#xff1a;\u5982\u79d2\u6740\u3001\u4f1a\u8bdd\u3001\u6392\u884c\u699c&#xff0c;\u52a1\u5fc5\u5173\u95edTHP&#xff0c;\u4fdd\u969cfork\u4e0e\u5199\u5165\u4f4e\u5ef6\u8fdf\u3002<\/li>\n<li>\u5927\u5185\u5b58\u5b9e\u4f8b&#xff1a;10GB&#043; Redis&#xff0c;THP\u5f71\u54cd\u5c24\u4e3a\u660e\u663e&#xff0c;\u5173\u95ed\u540efork\u5ef6\u8fdf\u53ef\u964d\u4f4e\u6570\u5341\u500d\u3002<\/li>\n<li>bigkey\u573a\u666f&#xff1a;\u5b9a\u671f\u62c6\u5206\u5927key&#xff0c;\u907f\u514d\u5355\u6b21COW\u590d\u5236\u591a\u4e2a\u5927\u9875\u3002<\/li>\n<\/ul>\n<hr \/>\n<h3>\u4e94\u3001\u96c6\u6210\u65b9\u6848\u4e0e\u9ad8\u9636\u5e94\u7528<\/h3>\n<table>\n<tr>\u6280\u672f\u6808\u96c6\u6210\u65b9\u5f0f\/\u9ad8\u9636\u5efa\u8bae<\/tr>\n<tbody>\n<tr>\n<td>Docker\/K8s<\/td>\n<td>\u5bb9\u5668\u542f\u52a8\u811a\u672c\u4e2d\u5173\u95edTHP<\/td>\n<\/tr>\n<tr>\n<td>\u4e91Redis<\/td>\n<td>\u4e91\u5382\u5546\u6587\u6863\u786e\u8ba4THP\u9ed8\u8ba4\u5173\u95ed<\/td>\n<\/tr>\n<tr>\n<td>DevOps\u5e73\u53f0<\/td>\n<td>\u81ea\u52a8\u5de1\u68c0THP\u72b6\u6001&#xff0c;\u5f02\u5e38\u62a5\u8b66\/\u4fee\u590d<\/td>\n<\/tr>\n<tr>\n<td>\u5206\u5e03\u5f0f\u96c6\u7fa4<\/td>\n<td>\u591a\u5b9e\u4f8b\u5206\u7247&#xff0c;\u7ed3\u5408THP\u5173\u95ed\u4e0ebigkey\u62c6\u5206<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<hr \/>\n<h3>\u516d\u3001\u5e95\u5c42\u5b9e\u73b0\u3001\u9ad8\u7ea7\u7b97\u6cd5\u4e0e\u67b6\u6784\u6f14\u8fdb<\/h3>\n<h4>6.1 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