{"id":511,"date":"2021-09-17T01:56:42","date_gmt":"2021-09-16T17:56:42","guid":{"rendered":"https:\/\/blog.cauchyschwarz.com\/?p=511"},"modified":"2021-09-17T01:56:46","modified_gmt":"2021-09-16T17:56:46","slug":"analyze-process-scheduling-with-perf","status":"publish","type":"post","link":"https:\/\/blog.cauchyschwarz.com\/?p=511","title":{"rendered":"Analyze Process Scheduling with Perf"},"content":{"rendered":"\n<p class=\"wp-block-paragraph\">Perf\u5de5\u5177\u53ef\u4ee5\u8bb0\u5f55Linux\u5185\u6838\u8c03\u5ea6\u76f8\u5173\u7684\u4e00\u4e9b\u4e8b\u4ef6\u53ca\u5176\u53d1\u751f\u65f6\u95f4\uff0c\u6211\u4eec\u53ef\u4ee5\u501f\u6b64\u5206\u6790\u5e94\u7528\u7a0b\u5e8f\u662f\u5426\u5b58\u5728\u9891\u7e41\u5730\u5728\u4e0d\u540c\u6838\u4e0a\u5207\u6362\u3001\u8fdb\u7a0b\u5524\u9192\u5ef6\u8fdf\u8fc7\u5927\u7b49\u95ee\u9898\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u65b9\u6cd5\u7684\u6838\u5fc3\u662f\u4f7f\u7528<code>perf sched<\/code>\u8fd9\u4e2a\u547d\u4ee4\u3002\u9996\u5148\u6211\u4eec\u9700\u8981\u5728\u7a0b\u5e8f\u8fd0\u884c\u7684\u65f6\u5019\u91c7\u96c6\u6570\u636e\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>perf sched record -a sleep 6<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\u4f7f\u7528\u4e0b\u9762\u7684\u547d\u4ee4\u53ef\u4ee5\u5e2e\u52a9\u6211\u4eec\u627e\u5230\u8fd96\u79d2\u5185scheduling latency\u503c\u6700\u5927\u7684\u4e00\u4e9b\u4e8b\u4ef6\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>perf sched latency -s max<\/code><\/pre>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"352\" src=\"https:\/\/blog.cauchyschwarz.com\/wp-content\/uploads\/2021\/09\/perf-max-sched-latency-1024x352.png\" alt=\"\" class=\"wp-image-512\" srcset=\"https:\/\/blog.cauchyschwarz.com\/wp-content\/uploads\/2021\/09\/perf-max-sched-latency-1024x352.png 1024w, https:\/\/blog.cauchyschwarz.com\/wp-content\/uploads\/2021\/09\/perf-max-sched-latency-300x103.png 300w, https:\/\/blog.cauchyschwarz.com\/wp-content\/uploads\/2021\/09\/perf-max-sched-latency-768x264.png 768w, https:\/\/blog.cauchyschwarz.com\/wp-content\/uploads\/2021\/09\/perf-max-sched-latency-670x230.png 670w, https:\/\/blog.cauchyschwarz.com\/wp-content\/uploads\/2021\/09\/perf-max-sched-latency.png 1372w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">\u4ece\u8f93\u51fa\u4e2d\u6211\u4eec\u4e5f\u53ef\u4ee5\u770b\u5230\u6bcf\u4e2a\u8fdb\u7a0b\u7684\u5207\u6362\u6b21\u6570\uff0c\u5e73\u5747\u5207\u6362\u7528\u65f6\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u4e0a\u9762\u7684\u547d\u4ee4\u7ed9\u51fa\u7684\u53ea\u662f\u4e00\u4e2a\u6c47\u603b\uff0c\u4f7f\u7528\u4e0b\u9762\u7684\u547d\u4ee4\u6211\u4eec\u53ef\u4ee5\u66f4\u6e05\u695a\u5730\u770b\u5230\u6bcf\u65f6\u6bcf\u523bCPU\u7684\u6bcf\u4e2a\u6838\u5728\u8fd0\u884c\u54ea\u4e00\u4e2a\u4efb\u52a1\uff0c\u8fd0\u884c\u4e86\u591a\u4e45\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>perf sched map<\/code><\/pre>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"566\" src=\"https:\/\/blog.cauchyschwarz.com\/wp-content\/uploads\/2021\/09\/perf-sched-map-1024x566.png\" alt=\"\" class=\"wp-image-513\" srcset=\"https:\/\/blog.cauchyschwarz.com\/wp-content\/uploads\/2021\/09\/perf-sched-map-1024x566.png 1024w, https:\/\/blog.cauchyschwarz.com\/wp-content\/uploads\/2021\/09\/perf-sched-map-300x166.png 300w, https:\/\/blog.cauchyschwarz.com\/wp-content\/uploads\/2021\/09\/perf-sched-map-768x425.png 768w, https:\/\/blog.cauchyschwarz.com\/wp-content\/uploads\/2021\/09\/perf-sched-map-1536x850.png 1536w, https:\/\/blog.cauchyschwarz.com\/wp-content\/uploads\/2021\/09\/perf-sched-map-670x371.png 670w, https:\/\/blog.cauchyschwarz.com\/wp-content\/uploads\/2021\/09\/perf-sched-map.png 1853w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<ul class=\"wp-block-list\"><li>\u5de6\u8fb9\u7684\u51e0\u5217\u4ee3\u8868\u4e86CPU\u7684\u51e0\u4e2a\u6838\uff0cCPU\u5904\u4e8e\u7a7a\u95f2\u72b6\u6001\u4e0b\u65f6\u5c31\u7528<code>.<\/code>\u8868\u793a\uff1b<\/li><li>\u50cfA0,B0,C0\u8fd9\u79cd\u6807\u8bc6\u7b26\u662f\u8fdb\u7a0b\u4ee3\u53f7\uff0c\u53ef\u4ee5\u901a\u8fc7\u627e\u8fd9\u4e9b\u4ee3\u53f7\u7b2c\u4e00\u6b21\u51fa\u73b0\u7684\u5730\u65b9\u770b\u770b\u4ed6\u4eec\u5206\u522b\u4ee3\u8868\u7684\u662f\u4ec0\u4e48\u8fdb\u7a0b\uff1b<\/li><li><code>*<\/code>\u7684\u51fa\u73b0\u8868\u793a\u53d1\u751f\u4e86<strong>Context Switch<\/strong>\uff1b<\/li><\/ul>\n\n\n\n<pre class=\"wp-block-code\"><code>perf sched timehist -MVw<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\u8fd9\u4e2a\u547d\u4ee4\u53ef\u4ee5\u67e5\u770b\u8fd9\u6bb5\u65f6\u95f4\u5185\u7684\u6bcf\u4e00\u6b21scheduling\u5ef6\u65f6<br><\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"566\" src=\"https:\/\/blog.cauchyschwarz.com\/wp-content\/uploads\/2021\/09\/perf-sched-timehist-1024x566.png\" alt=\"\" class=\"wp-image-514\" srcset=\"https:\/\/blog.cauchyschwarz.com\/wp-content\/uploads\/2021\/09\/perf-sched-timehist-1024x566.png 1024w, https:\/\/blog.cauchyschwarz.com\/wp-content\/uploads\/2021\/09\/perf-sched-timehist-300x166.png 300w, https:\/\/blog.cauchyschwarz.com\/wp-content\/uploads\/2021\/09\/perf-sched-timehist-768x425.png 768w, https:\/\/blog.cauchyschwarz.com\/wp-content\/uploads\/2021\/09\/perf-sched-timehist-1536x850.png 1536w, https:\/\/blog.cauchyschwarz.com\/wp-content\/uploads\/2021\/09\/perf-sched-timehist-670x371.png 670w, https:\/\/blog.cauchyschwarz.com\/wp-content\/uploads\/2021\/09\/perf-sched-timehist.png 1853w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">\u4f7f\u7528\u4e0b\u9762\u7684\u547d\u4ee4\u53ef\u4ee5\u83b7\u53d6Perf\u6536\u96c6\u5230\u7684\u6240\u6709sched\u76f8\u5173\u4e8b\u4ef6\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>perf sched script<\/code><\/pre>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"566\" src=\"https:\/\/blog.cauchyschwarz.com\/wp-content\/uploads\/2021\/09\/perf-sched-script-1024x566.png\" alt=\"\" class=\"wp-image-515\" srcset=\"https:\/\/blog.cauchyschwarz.com\/wp-content\/uploads\/2021\/09\/perf-sched-script-1024x566.png 1024w, https:\/\/blog.cauchyschwarz.com\/wp-content\/uploads\/2021\/09\/perf-sched-script-300x166.png 300w, https:\/\/blog.cauchyschwarz.com\/wp-content\/uploads\/2021\/09\/perf-sched-script-768x425.png 768w, https:\/\/blog.cauchyschwarz.com\/wp-content\/uploads\/2021\/09\/perf-sched-script-1536x850.png 1536w, https:\/\/blog.cauchyschwarz.com\/wp-content\/uploads\/2021\/09\/perf-sched-script-670x371.png 670w, https:\/\/blog.cauchyschwarz.com\/wp-content\/uploads\/2021\/09\/perf-sched-script.png 1853w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">\u5177\u4f53\u7684\u5173\u4e8e<code>perf sched<\/code>\u7684\u7528\u6cd5\u8fd8\u53ef\u4ee5\u53c2\u8003<a href=\"http:\/\/www.brendangregg.com\/blog\/2017-03-16\/perf-sched.html\">\u8fd9\u7bc7\u535a\u5ba2<\/a>\u548c<a href=\"https:\/\/www.scylladb.com\/2016\/06\/10\/read-latency-and-scylla-jmx-process\/\">\u8fd9\u7bc7\u535a\u5ba2<\/a>\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Perf\u5de5\u5177\u53ef\u4ee5\u8bb0\u5f55Linux\u5185\u6838\u8c03\u5ea6\u76f8\u5173\u7684\u4e00\u4e9b\u4e8b\u4ef6\u53ca\u5176\u53d1\u751f\u65f6\u95f4\uff0c\u6211\u4eec\u53ef\u4ee5\u501f\u6b64\u5206\u6790\u5e94\u7528\u7a0b\u5e8f\u662f\u5426\u5b58\u5728\u9891\u7e41\u5730\u5728\u4e0d\u540c\u6838\u4e0a\u5207\u6362\u3001\u8fdb\u7a0b\u5524\u9192\u5ef6\u8fdf\u8fc7\u5927\u7b49\u95ee\u9898\u3002 \u65b9\u6cd5\u7684\u6838\u5fc3\u662f\u4f7f\u7528perf sched\u8fd9\u4e2a\u547d\u4ee4\u3002\u9996\u5148\u6211\u4eec&#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":[55],"class_list":["post-511","post","type-post","status-publish","format-standard","hentry","category-10","tag-perf"],"_links":{"self":[{"href":"https:\/\/blog.cauchyschwarz.com\/index.php?rest_route=\/wp\/v2\/posts\/511","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=511"}],"version-history":[{"count":1,"href":"https:\/\/blog.cauchyschwarz.com\/index.php?rest_route=\/wp\/v2\/posts\/511\/revisions"}],"predecessor-version":[{"id":516,"href":"https:\/\/blog.cauchyschwarz.com\/index.php?rest_route=\/wp\/v2\/posts\/511\/revisions\/516"}],"wp:attachment":[{"href":"https:\/\/blog.cauchyschwarz.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=511"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/blog.cauchyschwarz.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=511"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/blog.cauchyschwarz.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=511"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}