{"id":786,"date":"2021-12-14T23:44:33","date_gmt":"2021-12-14T15:44:33","guid":{"rendered":"https:\/\/blog.cauchyschwarz.com\/?p=786"},"modified":"2021-12-14T23:44:39","modified_gmt":"2021-12-14T15:44:39","slug":"linux-huge-page","status":"publish","type":"post","link":"https:\/\/blog.cauchyschwarz.com\/?p=786","title":{"rendered":"Linux Huge Page"},"content":{"rendered":"\n<p>\u7ed9\u673a\u5668\u914d\u4e8664GB\u5185\u5b58\uff0c\u90a3\u4e48\u9664\u4e86\u7ec4\u6210\u53cc\u901a\u9053\u4ee5\u5916\u8fd8\u53ef\u4ee5\u600e\u4e48\u5229\u7528\u8fd9\u4e48\u591a\u7684\u5185\u5b58\u6765\u63d0\u5347\u7cfb\u7edf\u7684\u6574\u4f53\u6027\u80fd\u5462\uff1f\u8fd9\u65f6\u5c31\u53ef\u4ee5\u8003\u8651\u4e0b\u4f7f\u7528hugepages\u4e86\u3002<\/p>\n\n\n\n<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_82_2 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-69e0eaa86bb2d\" 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\" height=\"20px\" viewBox=\"0 0 24 24\" fill=\"none\"><path d=\"M6 6H4v2h2V6zm14 0H8v2h12V6zM4 11h2v2H4v-2zm16 0H8v2h12v-2zM4 16h2v2H4v-2zm16 0H8v2h12v-2z\" fill=\"currentColor\"><\/path><\/svg><svg style=\"fill: #999;color:#999\" class=\"arrow-unsorted-368013\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"10px\" height=\"10px\" viewBox=\"0 0 24 24\" version=\"1.2\" baseProfile=\"tiny\"><path d=\"M18.2 9.3l-6.2-6.3-6.2 6.3c-.2.2-.3.4-.3.7s.1.5.3.7c.2.2.4.3.7.3h11c.3 0 .5-.1.7-.3.2-.2.3-.5.3-.7s-.1-.5-.3-.7zM5.8 14.7l6.2 6.3 6.2-6.3c.2-.2.3-.5.3-.7s-.1-.5-.3-.7c-.2-.2-.4-.3-.7-.3h-11c-.3 0-.5.1-.7.3-.2.2-.3.5-.3.7s.1.5.3.7z\"\/><\/svg><\/span><\/span><\/label><input type=\"checkbox\"  id=\"ez-toc-cssicon-toggle-item-69e0eaa86bb2d\" checked aria-label=\"Toggle\" \/><nav><ul class='ez-toc-list ez-toc-list-level-1 ' ><li class='ez-toc-page-1 ez-toc-heading-level-1'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/blog.cauchyschwarz.com\/?p=786\/#swappiness\" >swappiness<\/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=786\/#Hugepages\" >Hugepages<\/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=786\/#%E7%A1%AE%E8%AE%A4%E7%B3%BB%E7%BB%9F%E6%98%AF%E5%90%A6%E6%94%AF%E6%8C%81Huge_pages\" >\u786e\u8ba4\u7cfb\u7edf\u662f\u5426\u652f\u6301Huge pages<\/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=786\/#%E8%AE%BE%E7%BD%AE%E5%90%AF%E7%94%A8Huge_pages\" >\u8bbe\u7f6e\u542f\u7528Huge pages<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-1'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/blog.cauchyschwarz.com\/?p=786\/#Transparent_Huge_Pages\" >Transparent Huge Pages<\/a><ul class='ez-toc-list-level-2' ><li class='ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"https:\/\/blog.cauchyschwarz.com\/?p=786\/#%E8%AE%BE%E7%BD%AE%E5%90%AF%E7%94%A8THP\" >\u8bbe\u7f6e\u542f\u7528THP<\/a><\/li><\/ul><\/li><\/ul><\/nav><\/div>\n<h1 class=\"wp-block-heading\" id=\"swappiness\"><span class=\"ez-toc-section\" id=\"swappiness\"><\/span>swappiness<span class=\"ez-toc-section-end\"><\/span><\/h1>\n\n\n\n<p><a href=\"https:\/\/askubuntu.com\/questions\/103915\/how-do-i-configure-swappiness\">\u8c03\u6574swappiness<\/a><\/p>\n\n\n\n<pre class=\"wp-block-code\"><code class=\"\">vm.swappiness = 10\n<\/code><\/pre>\n\n\n\n<h1 class=\"wp-block-heading\" id=\"hugepages\"><span class=\"ez-toc-section\" id=\"Hugepages\"><\/span>Hugepages<span class=\"ez-toc-section-end\"><\/span><\/h1>\n\n\n\n<p>linux\u4f5c\u865a\u62df\u5185\u5b58\u5230\u7269\u7406\u5185\u5b58\u7684\u6620\u5c04\u4ee5\u9875\u4e3a\u5355\u4f4d\uff0c\u4e00\u822c\u4e00\u98754KB\u3002\u90a3\u4e48\u6620\u5c041GB\u7684\u865a\u62df\u5185\u5b58\u5c31\u9700\u8981262144\u9875\u3002\u5047\u8bbetlb\u53ef\u4ee5\u7f13\u5b58n\u9879\uff0c\u90a3\u4e48\u4ee54KB\u4e3a\u4e00\u9875\u65f6\uff0ctlb\u5c31\u53ea\u80fd\u7f13\u5b58\u8fd9262144\u9879\u4e2d\u7684n\u9879\u3002\u5728\u5c06\u8fd91GB\u8303\u56f4\u5185\u7684\u865a\u62df\u5730\u5740\u7ffb\u8bd1\u6210\u7269\u7406\u5730\u5740\u65f6\uff0c\u9047\u5230tlb miss\u7684\u6982\u7387\u5c31\u4f1a\u6bd4\u8f83\u5927\u3002linux\u63d0\u4f9b\u4e86hugepage\u529f\u80fd\uff0c\u53ef\u4ee5\u5c06\u4e00\u4e9b\u7269\u7406\u5185\u5b58\u6309\u71672MB\u3001\u6216\u80051GB\u7684\u9875\u5927\u5c0f\u7ec4\u7ec7\u8d77\u6765\uff0c\u8fd9\u6837tlb\u5c31\u53ea\u9700\u8981\u6362\u5b58\u8fd9512\u6216\u80051\u9879\u4e2d\u7684n\u9879\uff0c\u9047\u5230tlb miss\u7684\u6982\u7387\u5c31\u5927\u5927\u51cf\u5c0f\u4e86\uff0c\u63d0\u9ad8\u4e86\u865a\u62df\u5730\u5740\u7ffb\u8bd1\u4e3a\u7269\u7406\u5730\u5740\u7684\u901f\u5ea6\u3002<br>Huge page\u7684\u53e6\u5916\u4e00\u4e2a\u597d\u5904\u662f\u4e0d\u4f1a\u88ab\u4ea4\u6362\u51fa\u5185\u5b58\u3002<\/p>\n\n\n\n<p><a href=\"https:\/\/www.percona.com\/blog\/2018\/12\/20\/benchmark-postgresql-with-linux-hugepages\/\">\u7f51\u4e0a\u627e\u7684\u4e00\u7bc7\u5bf9\u6bd4\u4f7f\u7528hugepage\u548c\u4e0d\u4f7f\u7528\u7684\u6548\u679c\u7684benchmarking\u535a\u5ba2<\/a>\u3002<\/p>\n\n\n\n<p><a href=\"https:\/\/serverfault.com\/questions\/898746\/how-to-know-if-my-servers-should-use-huge-pages-memory-page-size\">\u5173\u4e8ehugepages\u7684\u8ba8\u8bba<\/a>\u3002hugepages\u7684\u4e00\u4e2a\u660e\u663e\u7f3a\u70b9\u662f\u53ea\u80fd\u88ab\u80fd<em>\u611f\u77e5<\/em>hugepages\u7684\u7a0b\u5e8f\u4f7f\u7528\uff0c\u5178\u578b\u7684\u5982\u6570\u636e\u5e93\u3001\u865a\u62df\u673a\u3001dpdk\u76f8\u5173\u5e94\u7528\u7a0b\u5e8f\uff0c\u5176\u4ed6\u7a0b\u5e8f\u5982\u679c\u6ca1\u6709\u5c1d\u8bd5\u4f7f\u7528hugepage\u7684\u903b\u8f91\uff0c\u90a3\u4e48\u4f60\u63d0\u524d\u5206\u914d\u597d\u7684\u8fd9\u4e9bhugepages\u53ef\u80fd\u5c31\u6d6a\u8d39\u6389\u4e86\u3002\u5bf9\u4e8e\u8fd9\u79cd\u7f3a\u70b9\u4e00\u4e2a\u89e3\u51b3\u65b9\u6848\u662fTransparent Huge Pages\uff0c\u8ba9\u4e0d\u4e13\u95e8\u4f7f\u7528Hugepages\u7684\u7a0b\u5e8f\u5728\u7533\u8bf7\u5927\u7247\u5185\u5b58\u65f6\u7ed9\u5b83\u5206\u914dHuge page\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"%E7%A1%AE%E8%AE%A4%E7%B3%BB%E7%BB%9F%E6%98%AF%E5%90%A6%E6%94%AF%E6%8C%81huge-pages\"><span class=\"ez-toc-section\" id=\"%E7%A1%AE%E8%AE%A4%E7%B3%BB%E7%BB%9F%E6%98%AF%E5%90%A6%E6%94%AF%E6%8C%81Huge_pages\"><\/span>\u786e\u8ba4\u7cfb\u7edf\u662f\u5426\u652f\u6301Huge pages<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p><code>cat \/proc\/cpuinfo<\/code>\uff0c\u5982\u679c\u6709<em>pse<\/em>\u8fd9\u4e2a\u6807\u5fd7\uff0c\u90a3\u4e48\u5c31\u652f\u63012MB\u7684\u5de8\u9875\uff0c\u5982\u679c\u6709<em>pdpe1gb<\/em>\u8fd9\u4e2a\u6807\u5fd7\uff0c\u90a3\u4e48\u652f\u63011GB\u7684\u5de8\u9875\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"%E8%AE%BE%E7%BD%AE%E5%90%AF%E7%94%A8huge-pages\"><span class=\"ez-toc-section\" id=\"%E8%AE%BE%E7%BD%AE%E5%90%AF%E7%94%A8Huge_pages\"><\/span>\u8bbe\u7f6e\u542f\u7528Huge pages<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>\u7531\u4e8e\u8bbe\u7f6e\u8fd9\u4e2a\u5bf9\u65e5\u5e38\u4f7f\u7528\u6ca1\u4ec0\u4e48\u660e\u663e\u7684\u5e2e\u52a9\uff0c\u8fd9\u91cc\u5c31\u61d2\u5f97\u5199\u4e86\uff0c\u53c2\u89c1\u672c\u6587\u8d34\u7684\u5404\u79cd\u94fe\u63a5\u4e2d\u53d9\u8ff0\u7684\u65b9\u6cd5\u5c31\u884c\u3002<\/p>\n\n\n\n<h1 class=\"wp-block-heading\" id=\"transparent-huge-pages\"><span class=\"ez-toc-section\" id=\"Transparent_Huge_Pages\"><\/span>Transparent Huge Pages<span class=\"ez-toc-section-end\"><\/span><\/h1>\n\n\n\n<p>\u7531\u4e8e\u4f7f\u7528\u5de8\u9875\u6709\u7740\u8bf8\u591a\u9650\u5236\uff0c\u6240\u4ee5\u540e\u9762\u53c8\u53d1\u5c55\u51fa\u4e86Transparent Hugepages(THP)\u3002THP\u4e0d\u518d\u9700\u8981\u7cfb\u7edf\u7ba1\u7406\u5458\u663e\u793a\u5206\u914d\u5185\u5b58\u7528\u4f5c\u5de8\u9875\uff0c\u5e94\u7528\u7a0b\u5e8f\u4e5f\u4e0d\u7528\u64cd\u5fc3\u5982\u4f55\u53bb\u4f7f\u7528THP\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"%E8%AE%BE%E7%BD%AE%E5%90%AF%E7%94%A8thp\"><span class=\"ez-toc-section\" id=\"%E8%AE%BE%E7%BD%AE%E5%90%AF%E7%94%A8THP\"><\/span>\u8bbe\u7f6e\u542f\u7528THP<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>\u5c06*\/sys\/kernel\/mm\/transparent_hugepage<em>\u8bbe\u7f6e\u4e3a<strong>always<\/strong>\u3002\u7cfb\u7edf\u9ed8\u8ba4\u662f<strong>madvise<\/strong>\uff0c\u800c\u8fd9\u4e2amadvise\u662f\u9700\u8981\u5e94\u7528\u7a0b\u5e8f\u663e\u793a\u8c03\u7528madvise\uff0c\u5185\u6838\u624d\u4f1a\u5728\u5206\u914d\u5185\u5b58\u65f6\u8003\u8651\u4e3a\u5176\u4f7f\u7528\u5de8\u9875\u3002\u5185\u5b58\u5145\u8db3\u7684\u8bdd\uff0c\u5e72\u8106\u5c31\u76f4\u63a5\u8bbe\u7f6e\u4e3a<strong>always<\/strong>\u5427\u3002\u9664\u4e86\u901a\u8fc7<\/em>echo*\u547d\u4ee4\u53bb\u6539\u5199\u8fd9\u4e2a\u8bbe\u7f6e\uff0c\u4e5f\u53ef\u4ee5\u901a\u8fc7\u6539\u5199boot\u9009\u9879\u7684\u65b9\u5f0f\u8fdb\u884c\u66f4\u6539\uff0c\u5373\u5728linux kernel command line arguments\u91cc\u9762\u52a0\u4e0a<code>transparent_hugepage=always<\/code>\uff0c\u8fd9\u6837\u6bcf\u6b21\u7cfb\u7edf\u542f\u52a8\u540e\uff0c<em>transparent_hugepage<\/em>\u4e00\u9879\u7684\u503c\u5c31\u90fd\u662falways\u4e86\u3002<\/p>\n\n\n\n<p>\u68c0\u67e5\u6b63\u5728\u4f7f\u7528\u4e2d\u7684Transparent Hugepages\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code class=\"\">grep AnonHugePages \/proc\/meminfo\n<\/code><\/pre>\n\n\n\n<p>\u6216\u8005\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code class=\"\">egrep 'trans|thp' \/proc\/vmstat\n<\/code><\/pre>\n\n\n\n<p>\u68c0\u67e5\u6bcf\u4e2a\u8fdb\u7a0b\u6240\u4f7f\u7528\u7684Transparent Hugepages:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code class=\"\">grep -e AnonHugePages  \/proc\/*\/smaps | awk  '{ if($2&gt;4) print $0} ' |  awk -F \"\/\"  '{print $0; system(\"ps -fp \" $3)} '\n<\/code><\/pre>\n\n\n\n<p><a href=\"https:\/\/access.redhat.com\/solutions\/46111\">redhat\u5173\u4e8e\u4f7f\u7528THP\u7684\u6587\u6863<\/a>\uff0c\u5176\u4e2d\u6240\u8bb2\u7684<em>Explicit HugePages<\/em>\u5c31\u662f\u524d\u9762\u8bb2\u7684Hugepages\uff0c\u5c31\u662f\u9700\u8981\u5e94\u7528\u7a0b\u5e8f\u53bb\u663e\u5f0f\u4f7f\u7528\u7684\u90a3\u79cd\u3002<\/p>\n\n\n\n<p><a href=\"https:\/\/access.redhat.com\/documentation\/en-us\/red_hat_enterprise_linux\/7\/html\/performance_tuning_guide\/sect-red_hat_enterprise_linux-performance_tuning_guide-memory-configuring-huge-pages#sect-Red_Hat_Enterprise_Linux-Performance_tuning_guide-Memory-Configuring-huge-pages-at-run-time\">Hugepages\u4e0eNUMA<\/a><\/p>\n\n\n\n<p>\u6700\u540e\u9644\u4e0a\u4e00\u4e2a\u8bb2Hugepages\u7684pdf\uff0c<a href=\"https:\/\/file+.vscode-resource.vscode-webview.net\/blog\/assets\/\/public\/Wiki\/ComputerScience\/OperatingSystem\/Linux\/SystemSettings\/10_huge_pages.pdf\">\u5fd8\u8bb0\u662f\u5728\u54ea\u91cc\u627e\u5230\u7684<\/a>\uff0c\u8bb2\u7684\u6bd4\u8f83\u6e05\u695a\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u7ed9\u673a\u5668\u914d\u4e8664GB\u5185\u5b58\uff0c\u90a3\u4e48\u9664\u4e86\u7ec4\u6210\u53cc\u901a\u9053\u4ee5\u5916\u8fd8\u53ef\u4ee5\u600e\u4e48\u5229\u7528\u8fd9\u4e48\u591a\u7684\u5185\u5b58\u6765\u63d0\u5347\u7cfb\u7edf\u7684\u6574\u4f53\u6027\u80fd\u5462\uff1f\u8fd9\u65f6\u5c31\u53ef\u4ee5\u8003\u8651\u4e0b\u4f7f\u7528hugepages\u4e86\u3002 swappiness \u8c03\u6574swappiness Hugepa&#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":[82,38],"class_list":["post-786","post","type-post","status-publish","format-standard","hentry","category-10","tag-hugepage","tag-linux"],"_links":{"self":[{"href":"https:\/\/blog.cauchyschwarz.com\/index.php?rest_route=\/wp\/v2\/posts\/786","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=786"}],"version-history":[{"count":1,"href":"https:\/\/blog.cauchyschwarz.com\/index.php?rest_route=\/wp\/v2\/posts\/786\/revisions"}],"predecessor-version":[{"id":787,"href":"https:\/\/blog.cauchyschwarz.com\/index.php?rest_route=\/wp\/v2\/posts\/786\/revisions\/787"}],"wp:attachment":[{"href":"https:\/\/blog.cauchyschwarz.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=786"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/blog.cauchyschwarz.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=786"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/blog.cauchyschwarz.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=786"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}