{"id":10020460,"date":"2024-12-11T19:25:29","date_gmt":"2024-12-11T11:25:29","guid":{"rendered":"https:\/\/itmax.cn\/?p=10020460"},"modified":"2024-12-11T19:25:29","modified_gmt":"2024-12-11T11:25:29","slug":"kubernetes%ef%bc%9acpu-%e9%85%8d%e7%bd%ae%e3%80%81linux-cfs%e3%80%81%e7%bc%96%e7%a8%8b%e8%af%ad%e8%a8%80%e7%9a%84%e6%80%a7%e8%83%bd%e9%97%ae%e9%a2%98","status":"publish","type":"post","link":"https:\/\/itmax.cn\/?p=10020460","title":{"rendered":"Kubernetes\uff1aCPU \u914d\u7f6e\u3001Linux CFS\u3001\u7f16\u7a0b\u8bed\u8a00\u7684\u6027\u80fd\u95ee\u9898"},"content":{"rendered":"<h2>Kubernetes CPU \u914d\u7f6e -&gt; Linux CFS<\/h2>\n<p>\u5728\u4f7f\u7528 Kubernetes \u65f6\uff0c\u53ef\u4ee5\u901a\u8fc7 <code>resources.requests<\/code> \u548c <code>resources.limits<\/code> \u914d\u7f6e\u8d44\u6e90\u7684\u8bf7\u6c42\u548c\u9650\u989d\uff0c\u4f8b\u5982\uff1a<\/p>\n<pre><code class=\"yaml\">apiVersion: v1\nkind: Pod\nmetadata:\n  name: nginx\nspec:\n  containers:\n  - name: app\n    image: nginx\n    resources:\n      requests:\n        cpu: &quot;250m&quot;\n      limits:\n        cpu: &quot;500m&quot;<\/code><\/pre>\n<p>\u5bf9\u5bb9\u5668\u7684\u8d44\u6e90\u914d\u7f6e\u4f1a\u901a\u8fc7 <code>CRI<\/code> \u7ec4\u4ef6\uff08\u5982 <code>containerd<\/code>\u3001<code>cri-o<\/code> \u4ea4\u7531\u66f4\u5e95\u5c42\u7684 <code>runc<\/code> \u6216 <code>kata-container<\/code>\uff09\u53bb\u8bbe\u7f6e Linux \u7684 cgroup\u3002<\/p>\n<p>\u5728 cgroup v1 \u4e2d\uff08\u76ee\u524d\u4ecd\u7136\u662f\u4e3b\u6d41\u7248\u672c\uff0cv2 \u5219\u6b63\u5728\u53d1\u5c55\uff09\uff1a<\/p>\n<ul>\n<li><code>requests.cpu<\/code> \u5bf9\u5e94\u4e3a cgroup \u7684 <code>cpu.shares<\/code>\u3002<code>cpu.shares = 1024<\/code> \u8868\u793a\u4e00\u4e2a\u6838 CPU\uff0c<code>requests.cpu = 250m<\/code> \u8868\u793a 0.25 \u6838\uff0c\u5bf9\u5e94\u7684 <code>cpu.shares = 1024 * 0.25 = 256<\/code>\u3002\u6b64\u9879\u914d\u7f6e\u53ea\u4f5c\u7528\u5728 CPU \u7e41\u5fd9\u65f6\uff0c\u51b3\u5b9a\u5982\u4f55\u7ed9\u591a\u4e2a\u5bb9\u5668\u6309\u6bd4\u4f8b\u5206\u914d CPU \u65f6\u95f4\u3002<\/li>\n<li>\n<p><code>limits.cpu<\/code> \u5bf9\u5e94\u4e3a cgroup \u7684\uff1a<\/p>\n<ul>\n<li><code>cpu.cfs_period_us<\/code>\uff1a\u8868\u793a CPU \u8c03\u5ea6\u5468\u671f\uff0c\u4e00\u822c\u662f 100000 us\uff0c\u5373 100 ms\u3002<\/li>\n<li><code>cpu.cfs_quota_us<\/code>\uff1a\u8868\u793a\u5728\u4e00\u4e2a\u5468\u671f\u5185\uff0c\u5bb9\u5668\u6700\u591a\u53ef\u4ee5\u4f7f\u7528\u7684 CPU \u65f6\u95f4\u3002<code>limits.cpu = 500m<\/code> \u8868\u793a 0.5 \u6838\uff0c\u5bf9\u5e94\u7684 <code>cpu.cfs_quota_us = 100000 * 0.5 = 50000<\/code>\u3002<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<p>\u4ee5\u4e0a\u914d\u7f6e\u53ef\u4ee5\u8fdb\u5165\u8be5\u5bb9\u5668\u4e2d\u7684 <code>\/sys\/fs\/cgroup\/cpu\/<\/code> \u76ee\u5f55\u67e5\u770b\uff0c\u4e5f\u53ef\u4ee5\u76f4\u63a5\u67e5\u770b\u5bbf\u4e3b\u673a\u4e0a\u7684 <code>\/sys\/fs\/cgroup\/cpu\/kubepods.slice\/kubepods-burstable.slice\/kubepods-burstable-pod&lt;uid&gt;.slice\/cri-containerd-&lt;uid&gt;.scope\/<\/code> \u76ee\u5f55\u3002<\/p>\n<p>\u6b64\u65f6\u53ef\u4ee5\u770b\u5230\uff0c\u5728\u5bb9\u5668\u73af\u5883\u4e0b\uff0c\u5bf9 CPU \u7684\u9650\u989d\u662f\u901a\u8fc7 Linux \u7684 CFS \u673a\u5236\u6765\u5b8c\u6210\u7684\u3002\u7531\u6b64\u5f88\u81ea\u7136\u5730\u5f15\u51fa\u4e86\u4e00\u4e2a\u95ee\u9898\uff1a\u5bb9\u5668\u91cc\u7684\u5e94\u7528\u7a0b\u5e8f\/\u7f16\u7a0b\u8bed\u8a00\u62ff\u5230\u7684 CPU \u6838\u6570\u662f\u4ec0\u4e48\uff1f<\/p>\n<h2>\u5bb9\u5668\u73af\u5883\u4e2d\u7684\u7f16\u7a0b\u8bed\u8a00<\/h2>\n<p>\u5982\u679c\u901a\u8fc7 CPU \u6838\u6570\u53bb\u8bbe\u7f6e\u534f\u7a0b\/\u7ebf\u7a0b\/\u8fdb\u7a0b\u6570\u65f6\uff0c\u53ef\u80fd\u4f1a\u53d1\u751f\u610f\u6599\u4e4b\u5916\u7684\u6027\u80fd\u95ee\u9898\u3002<\/p>\n<p>\u5728 Golang \u4e2d\uff0c\u901a\u8fc7 <code>GPM<\/code>\uff08<code>Goroutine-Processor-Machine<\/code>\uff09\u6a21\u5f0f\u8c03\u5ea6 <code>goroutine<\/code>\uff0c\u800c processor \u7684\u6570\u91cf\u53d6\u81ea <code>GOMAXPROCS<\/code>\uff0c<code>GOMAXPROCS<\/code> \u7684\u9ed8\u8ba4\u503c\u5219\u662f <code>runtime.NumCPU()<\/code> \u62ff\u5230\u7684\u5bbf\u4e3b\u673a CPU \u6838\u6570\u3002\u8fd9\u53ef\u80fd\u5bfc\u81f4\u5e94\u7528\u7a0b\u5e8f\u51fa\u73b0\u66f4\u5927\u7684\u5ef6\u8fdf\uff0c\u5bb9\u5668\u914d\u989d\u8d8a\u5c0f\u3001\u5bbf\u4e3b\u673a\u8d44\u6e90\u8d8a\u5927\u65f6\u5f71\u54cd\u8d8a\u7cdf\u7cd5\u3002\u89e3\u51b3\u65b9\u5f0f\u5c31\u662f\u8bbe\u7f6e <code>GOMAXPROCS=max(1, floor(cpu_quota))<\/code>\uff0c\u6216\u8005\u76f4\u63a5\u4f7f\u7528 <code>uber-go\/automaxprocs<\/code> \u8fd9\u4e2a\u5e93\u3002\u66f4\u591a\u4fe1\u606f\u53ef\u53c2\u8003\uff1a<a href=\"https:\/\/link.segmentfault.com\/?enc=6Z8eEmFcfbAvwXmyqvUDdQ%3D%3D.4EuzgwQJtkYOEXhrd4peblyJ%2BAMbTkn5fIVQ0GFaqH2rO59UbupO9CPz2QChE3FF\" rel=\"nofollow noopener noreferrer\" target=\"_blank\">https:\/\/github.com\/golang\/go\/issues\/33803<\/a>\u3002<\/p>\n<p>\u5728 Java \u4e2d\uff0cJVM \u7684\u5783\u573e\u56de\u6536\u673a\u5236\u4e0e Linux CFS \u8c03\u5ea6\u5668\u7684\u76f8\u4e92\u4f5c\u7528\uff0c\u4e5f\u53ef\u80fd\u5bfc\u81f4\u66f4\u957f\u7684 STW\uff08stop-the-word\uff09\u3002LinkedIn \u5de5\u7a0b\u5e08\u5728\u535a\u6587 <a href=\"https:\/\/link.segmentfault.com\/?enc=euX1REBvQn%2BOGS3bDXpN7w%3D%3D.%2B0PMhxi3efMqkEW8QRCX4mOws3gTQdCj8Hf6hUfzHxvcRnUKVtCXrX0efySxFUXca5%2BbBN5s%2FVYpX8vQEsCh8MhtkthFXn3DEK5bjcoBmou3wpplYGVHw6%2FioTf1JMeNk6gcusop%2FDRsWOhTY4p5InLf3cJw0JNjisHr0%2BaSmPQ%3D\" rel=\"nofollow noopener noreferrer\" target=\"_blank\">Application Pauses When Running JVM Inside Linux Control Groups<\/a> \u4e2d\u5219\u5efa\u8bae\u63d0\u4f9b\u8db3\u591f\u7684 CPU \u914d\u989d\uff0c\u5e76\u4e14\u5e94\u8be5\u6839\u636e\u573a\u666f\u8c03\u4f4e GC \u7ebf\u7a0b\u3002<\/p>\n<p>\u66f4\u597d\u7684\u65b9\u5f0f\u663e\u7136\u662f\u6d88\u9664\u6a21\u7cca\uff0c\u6839\u636e\u5bb9\u5668\u7684\u8d44\u6e90\u914d\u7f6e\uff0c\u660e\u786e\u5730\u8bbe\u7f6e\u76f8\u5173\u5f71\u54cd\u503c\u3002<\/p>\n<h2>\u603b\u7ed3<\/h2>\n<p>Kubernetes \u5de5\u4f5c\u8d1f\u8f7d\u7684 CPU \u914d\u989d\u51b3\u5b9a\u4e86 Linux CFS \u7684\u884c\u4e3a\uff0c\u8fdb\u800c\u6709\u53ef\u80fd\u5bfc\u81f4\u7f16\u7a0b\u8bed\u8a00\u610f\u6599\u4e4b\u5916\u7684\u6027\u80fd\u95ee\u9898\u3002<\/p>\n<hr>\n<p>(\u6211\u662f\u51cc\u865a\uff0c\u5173\u6ce8\u6211\uff0c\u65e0\u5e7f\u544a\uff0c\u4e13\u6ce8\u6280\u672f\uff0c\u4e0d\u717d\u52a8\u60c5\u7eea\uff0c\u6b22\u8fce\u4e0e\u6211\u4ea4\u6d41)<\/p>\n<hr>\n<p>\u53c2\u8003\u8d44\u6599\uff1a<\/p>\n<ul>\n<li><em><a href=\"https:\/\/link.segmentfault.com\/?enc=NKzKSuk6Ngri%2BhF4k5uFtQ%3D%3D.8MH%2B1e2kmjZwjfZz1uF67cx2Q%2B7PXJVblwTqc42SmCHS4BlB54WAijfxD9MjCKDN\" rel=\"nofollow noopener noreferrer\" target=\"_blank\">https:\/\/github.com\/golang\/go\/issues\/33803<\/a><\/em><\/li>\n<li><em><a href=\"https:\/\/link.segmentfault.com\/?enc=qbOI5QvrdKD%2B4uQI3xHQQg%3D%3D.iy8MYMueFxQ46stSjDghutnATD7kpI7PteKbMYaDocN5OLmBdDDArpFuB9cvkb9EoSb3MXp%2FQ%2Bwo%2FRfsua%2FhNHVUc%2FE%2Fu5OTehJ2rWWarbAeUOQPPTx3bDlc7kIuB4VrBVvIK9dd3BrXwwpbqFeTHKvKwIUreIeDqxFxta%2FUW6E%3D\" rel=\"nofollow noopener noreferrer\" target=\"_blank\">https:\/\/www.linkedin.com\/blog\/engineering\/archive\/application&#8230;<\/a><\/em><\/li>\n<li><em><a href=\"https:\/\/link.segmentfault.com\/?enc=KULMdmjlOoiDxtUBa7B7%2Fw%3D%3D.kw09zYd64RT0FU91uMH8dhubTv5LmT6PIhC8NSCvl3dFxjxbfbSEm%2BYAXLxiYK%2B0rbgekUH4GRPPnb1n5xCRg5UOShF8%2Fj6Pq%2F6DE8wyYyU%3D\" rel=\"nofollow noopener noreferrer\" target=\"_blank\">https:\/\/www.kernel.org\/doc\/Documentation\/scheduler\/sched-bwc.txt<\/a><\/em><\/li>\n<\/ul>\n<p><a href=\"https:\/\/segmentfault.com\/a\/1190000045585770\">https:\/\/segmentfault.com\/a\/1190000045585770<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Kubernetes CPU \u914d\u7f6e -&gt; Linux CFS \u5728\u4f7f\u7528 Kubernetes \u65f6\uff0c\u53ef\u4ee5\u901a\u8fc7 [&hellip;]<\/p>\n","protected":false},"author":8,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_jetpack_memberships_contains_paid_content":false,"footnotes":""},"categories":[4],"tags":[],"class_list":["post-10020460","post","type-post","status-publish","format-standard","hentry","category-share"],"jetpack_sharing_enabled":true,"jetpack_featured_media_url":"","_links":{"self":[{"href":"https:\/\/itmax.cn\/index.php?rest_route=\/wp\/v2\/posts\/10020460","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/itmax.cn\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/itmax.cn\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/itmax.cn\/index.php?rest_route=\/wp\/v2\/users\/8"}],"replies":[{"embeddable":true,"href":"https:\/\/itmax.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=10020460"}],"version-history":[{"count":0,"href":"https:\/\/itmax.cn\/index.php?rest_route=\/wp\/v2\/posts\/10020460\/revisions"}],"wp:attachment":[{"href":"https:\/\/itmax.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=10020460"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/itmax.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=10020460"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/itmax.cn\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=10020460"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}