{"id":7197,"date":"2023-03-03T16:18:18","date_gmt":"2023-03-03T08:18:18","guid":{"rendered":"https:\/\/yanjingang.com\/blog\/?p=7197"},"modified":"2023-05-10T17:48:11","modified_gmt":"2023-05-10T09:48:11","slug":"c%e6%80%a7%e8%83%bd%e4%bc%98%e5%8c%96-cpu%e5%8d%a0%e7%94%a8%e5%88%86%e6%9e%90","status":"publish","type":"post","link":"https:\/\/yanjingang.com\/blog\/?p=7197","title":{"rendered":"C++\u6027\u80fd\u4f18\u5316\u2014CPU\u5360\u7528\u5206\u6790"},"content":{"rendered":"<p>\u8f6f\u4ef6\u7684\u6027\u80fd\u5206\u6790\uff0c\u5f80\u5f80\u9700\u8981\u67e5\u770b CPU \u8017\u65f6\uff0c\u4e86\u89e3\u74f6\u9888\u5728\u54ea\u91cc\u3002perf\u548c\u706b\u7130\u56fe\u662f\u6027\u80fd\u5206\u6790\u7684\u5229\u5668\u3002\u672c\u6587\u4e3b\u8981\u4ecb\u7ecd\u5b83\u4eec\u7684\u57fa\u672c\u7528\u6cd5\u3002<\/p>\n<p><a href=\"https:\/\/yanjingang.com\/blog\/wp-content\/uploads\/2023\/03\/flame-graph-svg.png\"><img loading=\"lazy\" class=\"alignnone size-large wp-image-7208\" src=\"https:\/\/yanjingang.com\/blog\/wp-content\/uploads\/2023\/03\/flame-graph-svg-1024x525.png\" alt=\"\" width=\"625\" height=\"320\" srcset=\"https:\/\/yanjingang.com\/blog\/wp-content\/uploads\/2023\/03\/flame-graph-svg-1024x525.png 1024w, https:\/\/yanjingang.com\/blog\/wp-content\/uploads\/2023\/03\/flame-graph-svg-300x154.png 300w, https:\/\/yanjingang.com\/blog\/wp-content\/uploads\/2023\/03\/flame-graph-svg-768x394.png 768w, https:\/\/yanjingang.com\/blog\/wp-content\/uploads\/2023\/03\/flame-graph-svg-624x320.png 624w, https:\/\/yanjingang.com\/blog\/wp-content\/uploads\/2023\/03\/flame-graph-svg.png 1188w\" sizes=\"(max-width: 625px) 100vw, 625px\" \/><\/a><\/p>\n<h1>\u4e00\u3001perf\u6027\u80fd\u5206\u6790\u5de5\u5177<\/h1>\n<p>perf \uff08performance \u7684\u7f29\u5199\uff09\u662f Linux \u7cfb\u7edf\u539f\u751f\u63d0\u4f9b\u7684\u6027\u80fd\u5206\u6790\u5de5\u5177\uff0c\u4f1a\u8fd4\u56de CPU \u6b63\u5728\u6267\u884c\u7684\u51fd\u6570\u540d\u4ee5\u53ca\u8c03\u7528\u6808\uff08stack\uff09\u3002\u5b83\u7684\u4e3b\u8981\u4f5c\u7528\u662f\u5bf9\u7a0b\u5e8f\u7684\u8c03\u7528\u6808\u8fdb\u884c\u91c7\u6837\u5206\u6790\uff0c\u901a\u8fc7\u8c03\u7528\u6808\u53cd\u63a8\u51fa\u51fd\u6570\u7684\u8c03\u7528\u6b21\u6570\u3001\u5173\u7cfb\u548cCPU\u6d88\u8017\u65f6\u95f4\u3002<\/p>\n<h4>1\u3001\u5b89\u88c5perf<\/h4>\n<p>perf\u5305\u542b\u5728linux-tools\u5e93\u91cc\uff0c\u6211\u4eec\u53ef\u4ee5\u901a\u8fc7\u4e0b\u65b9\u7684\u6307\u4ee4\u6765\u5b89\u88c5\u5b83\uff1a<\/p>\n<pre class=\"pure-highlightjs\"><code class=\"\">sudo apt install linux-tools-common linux-tools-generic linux-tools-`uname -r`<\/code><\/pre>\n<h4>2\u3001\u5f55\u5236CPU\u6267\u884c\u5806\u6808<\/h4>\n<p>\u901a\u5e38\uff0c\u5b83\u7684\u6267\u884c\u9891\u7387\u662f 99Hz\uff08\u6bcf\u79d299\u6b21\uff09\uff0c\u5982\u679c99\u6b21\u90fd\u8fd4\u56de\u540c\u4e00\u4e2a\u51fd\u6570\u540d\uff0c\u90a3\u5c31\u8bf4\u660e CPU \u8fd9\u4e00\u79d2\u949f\u90fd\u5728\u6267\u884c\u540c\u4e00\u4e2a\u51fd\u6570\uff0c\u53ef\u80fd\u5b58\u5728\u6027\u80fd\u95ee\u9898\u3002<\/p>\n<pre class=\"pure-highlightjs\"><code class=\"\">sudo perf record -F 99 -a -g -p `pidof .\/bin\/test` -o perf.data -- sleep 30<\/code><\/pre>\n<p>\u4e0a\u9762\u7684\u4ee3\u7801\u4e2d\uff0cperf record\u8868\u793a\u8bb0\u5f55\uff0c-F 99\u8868\u793a\u6bcf\u79d299\u6b21\uff0c-a \u8868\u793a\u5bf9\u6240\u6709\u7684CPU\u6838\u91c7\u6837\uff0c-g\u8868\u793a\u8bb0\u5f55\u8c03\u7528\u6808\uff0c-p \u6307\u5b9a\u8981\u5206\u6790\u7684\u8fdb\u7a0b\u53f7\uff0c-o \u6307\u5b9a\u8f93\u51fa\u6587\u4ef6\uff08\u9ed8\u8ba4\u4e3aperf.data\uff09\uff0csleep 30\u5219\u662f\u6301\u7eed30\u79d2\u3002<\/p>\n<p>\u8fd0\u884c\u540e\u4f1a\u5728\u5f53\u524d\u76ee\u5f55\u4ea7\u751f\u4e00\u4e2a\u9ed8\u8ba4\u540d\u4e3aperf.data\u7684\u6587\u672c\u6587\u4ef6\u3002\u5982\u679c\u4e00\u53f0\u670d\u52a1\u5668\u670916\u4e2a CPU\uff0c\u6bcf\u79d2\u62bd\u683799\u6b21\uff0c\u6301\u7eed30\u79d2\uff0c\u5c31\u5f97\u5230 47,520 \u4e2a\u8c03\u7528\u6808\uff0c\u957f\u8fbe\u51e0\u5341\u4e07\u751a\u81f3\u4e0a\u767e\u4e07\u884c\uff0c\u6587\u4ef6\u4f1a\u975e\u5e38\u5e9e\u5927\u3002<\/p>\n<h4>3\u3001\u7edf\u8ba1\u8c03\u7528\u6808\u51fa\u73b0\u767e\u5206\u6bd4<\/h4>\n<p>\u4e3a\u4e86\u4fbf\u4e8e\u9605\u8bfb\uff0c<code>perf record<\/code>\u547d\u4ee4\u53ef\u4ee5\u7edf\u8ba1\u6bcf\u4e2a\u8c03\u7528\u6808\u51fa\u73b0\u7684\u767e\u5206\u6bd4\uff0c\u7136\u540e\u4ece\u9ad8\u5230\u4f4e\u6392\u5217\u3002<\/p>\n<pre class=\"pure-highlightjs\"><code class=\"\">sudo perf report -i perf.data -n --stdio -f<\/code><\/pre>\n<p><a href=\"https:\/\/yanjingang.com\/blog\/wp-content\/uploads\/2023\/03\/perf-report.png\"><img loading=\"lazy\" class=\"alignnone size-full wp-image-7198\" src=\"https:\/\/yanjingang.com\/blog\/wp-content\/uploads\/2023\/03\/perf-report.png\" alt=\"\" width=\"990\" height=\"687\" srcset=\"https:\/\/yanjingang.com\/blog\/wp-content\/uploads\/2023\/03\/perf-report.png 990w, https:\/\/yanjingang.com\/blog\/wp-content\/uploads\/2023\/03\/perf-report-300x208.png 300w, https:\/\/yanjingang.com\/blog\/wp-content\/uploads\/2023\/03\/perf-report-768x533.png 768w, https:\/\/yanjingang.com\/blog\/wp-content\/uploads\/2023\/03\/perf-report-624x433.png 624w\" sizes=\"(max-width: 990px) 100vw, 990px\" \/><\/a><\/p>\n<p>\u8fd9\u4e2a\u7ed3\u679c\u8fd8\u662f\u4e0d\u6613\u8bfb\uff0c\u6240\u4ee5\u6211\u4eec\u9700\u8981\u7528\u5230\u4e0b\u65b9\u8f6c\u6362\u4e3a\u706b\u7130\u56fe\u7684\u5de5\u5177\u3002<\/p>\n<h1>\u4e8c\u3001FlameGraph\u706b\u7130\u56fe\u751f\u6210\u5de5\u5177<\/h1>\n<p>\u706b\u7130\u56fe\u662f\u57fa\u4e8e perf \u7ed3\u679c\u4ea7\u751f\u7684 SVG \u56fe\u7247\uff0c\u7528\u6765\u5c55\u793a CPU \u7684\u8c03\u7528\u6808\u3002<\/p>\n<h4>1\u3001\u5b89\u88c5FlameGraph<\/h4>\n<p>\u4e0b\u8f7d\u706b\u7130\u56fe\u751f\u6210\u5de5\u5177FlameGraph\uff1a<\/p>\n<pre class=\"pure-highlightjs\"><code class=\"\">git clone https:\/\/github.com\/brendangregg\/FlameGraph.git<\/code><\/pre>\n<h4>2\u3001\u751f\u6210\u706b\u7130\u56fe<\/h4>\n<pre class=\"pure-highlightjs\"><code class=\"\">#\u3000\u6839\u636eperf.data\u751f\u6210\u706b\u7130\u56fe\u7684\u6b65\u9aa4\r\nsudo perf script -i perf.data &gt; perf.unfold\r\n.\/FlameGraph\/stackcollapse-perf.pl perf.unfold &gt; perf.folded\r\n.\/FlameGraph\/flamegraph.pl perf.folded &gt; perf.svg\r\n#\u3000\u4ee5\u4e0a\u6b65\u9aa4\u4e5f\u53ef\u4ee5\u5408\u4e3a\u4e0b\u8fb9\u7684\u6307\u4ee4\r\n<span class=\"hljs-comment\">sudo perf s<\/span>cript -i perf.data | .<span class=\"hljs-operator\">\/<\/span>FlameGraph<span class=\"hljs-operator\">\/<\/span>stackcollapse-perf.pl | .<span class=\"hljs-operator\">\/<\/span>FlameGraph<span class=\"hljs-operator\">\/<\/span>flamegraph.pl <span class=\"hljs-operator\">&gt;<\/span> perf.svg<\/code><\/pre>\n<h4>3\u3001\u67e5\u770b\u706b\u7130\u56fe<\/h4>\n<p>\u628asvg\u6587\u4ef6\u62d6\u5230\u6d4f\u89c8\u5668\u91cc\u5373\u53ef\u67e5\u770b\uff1a<\/p>\n<ul>\n<li>y \u8f74\u8868\u793a\u8c03\u7528\u6808\uff0c\u6bcf\u4e00\u5c42\u90fd\u662f\u4e00\u4e2a\u51fd\u6570\u3002\u8c03\u7528\u6808\u8d8a\u6df1\uff0c\u706b\u7130\u5c31\u8d8a\u9ad8\uff0c\u9876\u90e8\u5c31\u662f\u6b63\u5728\u6267\u884c\u7684\u51fd\u6570\uff0c\u4e0b\u65b9\u90fd\u662f\u5b83\u7684\u7236\u51fd\u6570\u3002<\/li>\n<li>x \u8f74\u8868\u793a\u62bd\u6837\u6570\uff0c\u5982\u679c\u4e00\u4e2a\u51fd\u6570\u5728 x \u8f74\u5360\u636e\u7684\u5bbd\u5ea6\u8d8a\u5bbd\uff0c\u5c31\u8868\u793a\u5b83\u88ab\u62bd\u5230\u7684\u6b21\u6570\u591a\uff0c\u5373\u6267\u884c\u7684\u65f6\u95f4\u957f\u3002\u6ce8\u610f\uff0cx \u8f74\u4e0d\u4ee3\u8868\u65f6\u95f4\uff0c\u800c\u662f\u6240\u6709\u7684\u8c03\u7528\u6808\u5408\u5e76\u540e\uff0c\u6309\u5b57\u6bcd\u987a\u5e8f\u6392\u5217\u7684\u3002<\/li>\n<li>\u989c\u8272\u6ca1\u6709\u7279\u6b8a\u542b\u4e49\uff0c\u56e0\u4e3a\u706b\u7130\u56fe\u8868\u793a\u7684\u662f CPU \u7684\u7e41\u5fd9\u7a0b\u5ea6\uff0c\u6240\u4ee5\u4e00\u822c\u9009\u62e9\u6696\u8272\u8c03\u3002<\/li>\n<\/ul>\n<p>\u706b\u7130\u56fe\u5c31\u662f\u770b\u9876\u5c42\u7684\u54ea\u4e2a\u51fd\u6570\u5360\u636e\u7684<span style=\"color: #ff0000;\">\u5bbd\u5ea6<\/span>\u6700\u5927\u3002\u53ea\u8981\u6709&#8221;\u5e73\u9876&#8221;\uff08plateaus\uff09\uff0c\u5c31\u8868\u793a\u8be5\u51fd\u6570\u53ef\u80fd\u5b58\u5728\u6027\u80fd\u95ee\u9898\u3002<\/p>\n<p><a href=\"https:\/\/yanjingang.com\/blog\/wp-content\/uploads\/2023\/03\/perf-svg.png\"><img loading=\"lazy\" class=\"alignnone size-large wp-image-7200\" src=\"https:\/\/yanjingang.com\/blog\/wp-content\/uploads\/2023\/03\/perf-svg-1024x322.png\" alt=\"\" width=\"625\" height=\"197\" srcset=\"https:\/\/yanjingang.com\/blog\/wp-content\/uploads\/2023\/03\/perf-svg-1024x322.png 1024w, https:\/\/yanjingang.com\/blog\/wp-content\/uploads\/2023\/03\/perf-svg-300x94.png 300w, https:\/\/yanjingang.com\/blog\/wp-content\/uploads\/2023\/03\/perf-svg-768x241.png 768w, https:\/\/yanjingang.com\/blog\/wp-content\/uploads\/2023\/03\/perf-svg-624x196.png 624w, https:\/\/yanjingang.com\/blog\/wp-content\/uploads\/2023\/03\/perf-svg.png 1187w\" sizes=\"(max-width: 625px) 100vw, 625px\" \/><\/a><\/p>\n<p>*\u6ce8\uff1a\u4e0a\u56fe\u6f14\u793a\u7684\u662f\u4e00\u4e2aDDS\u6536\u53d1\u6f14\u793a\u8fdb\u7a0b\uff0c\u6293\u53d6\u8fc7\u7a0b\u4e2d\u9664\u4e86\u6536\u53d1\u6ca1\u6709\u505a\u5176\u4ed6\u5de5\u4f5c\uff0c\u6240\u4ee5\u53ef\u4ee5\u770b\u5230DDS\u5360\u7528\u4e86\u8f83\u591a\u7684CPU\u65f6\u95f4\u3002<\/p>\n<p><a href=\"https:\/\/yanjingang.com\/blog\/wp-content\/uploads\/2023\/03\/perf-svg-1.png\"><img loading=\"lazy\" class=\"alignnone size-large wp-image-7362\" src=\"https:\/\/yanjingang.com\/blog\/wp-content\/uploads\/2023\/03\/perf-svg-1-1024x776.png\" alt=\"\" width=\"625\" height=\"474\" srcset=\"https:\/\/yanjingang.com\/blog\/wp-content\/uploads\/2023\/03\/perf-svg-1-1024x776.png 1024w, https:\/\/yanjingang.com\/blog\/wp-content\/uploads\/2023\/03\/perf-svg-1-300x227.png 300w, https:\/\/yanjingang.com\/blog\/wp-content\/uploads\/2023\/03\/perf-svg-1-768x582.png 768w, https:\/\/yanjingang.com\/blog\/wp-content\/uploads\/2023\/03\/perf-svg-1-624x473.png 624w, https:\/\/yanjingang.com\/blog\/wp-content\/uploads\/2023\/03\/perf-svg-1.png 1190w\" sizes=\"(max-width: 625px) 100vw, 625px\" \/><\/a><\/p>\n<p>*\u6ce8\uff1a\u589e\u52a0\u4e86\u5176\u4ed6\u5904\u7406\u5de5\u4f5c\u7684\u8fdb\u7a0b\uff0c\u53ef\u4ee5\u770b\u5230\u6d88\u606f\u6536\u53d1\u4f9d\u7136\u662f\u5360\u7528\u4e86\u4e3b\u8981\u7684CPU\u65f6\u95f4\uff0c\u5176\u4ed6\u7ebf\u7a0b\u5360\u7528\u4e86\u5269\u4e0b\u7684CPU\u65f6\u95f4\u3002<\/p>\n<p>&nbsp;<\/p>\n<p>yan 23.3.3<\/p>\n<p>&nbsp;<\/p>\n<p>\u53c2\u8003\uff1a<\/p>\n<p><a href=\"https:\/\/github.com\/brendangregg\/FlameGraph\" target=\"_blank\" rel=\"noopener\">FlameGraph<\/a><\/p>\n<p><a href=\"http:\/\/ruanyifeng.com\/blog\/2017\/09\/flame-graph.html\" target=\"_blank\" rel=\"noopener\">\u5982\u4f55\u8bfb\u61c2\u706b\u7130\u56fe\uff1f<\/a><\/p>\n<p><a href=\"https:\/\/www.cnblogs.com\/wx170119\/p\/11855263.html\" target=\"_blank\" rel=\"noopener\">Linux perf\u547d\u4ee4\u8be6\u89e3\u53ca\u5e38\u7528\u53c2\u6570\u89e3\u6790<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u8f6f\u4ef6\u7684\u6027\u80fd\u5206\u6790\uff0c\u5f80\u5f80\u9700\u8981\u67e5\u770b CPU \u8017\u65f6\uff0c\u4e86\u89e3\u74f6\u9888\u5728\u54ea\u91cc\u3002perf\u548c\u706b\u7130\u56fe\u662f\u6027\u80fd\u5206\u6790\u7684\u5229\u5668\u3002\u672c\u6587\u4e3b\u8981\u4ecb\u7ecd\u5b83\u4eec [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":[],"categories":[1027,1262,1293],"tags":[877,1263,855,6],"_links":{"self":[{"href":"https:\/\/yanjingang.com\/blog\/index.php?rest_route=\/wp\/v2\/posts\/7197"}],"collection":[{"href":"https:\/\/yanjingang.com\/blog\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/yanjingang.com\/blog\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/yanjingang.com\/blog\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/yanjingang.com\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=7197"}],"version-history":[{"count":4,"href":"https:\/\/yanjingang.com\/blog\/index.php?rest_route=\/wp\/v2\/posts\/7197\/revisions"}],"predecessor-version":[{"id":7363,"href":"https:\/\/yanjingang.com\/blog\/index.php?rest_route=\/wp\/v2\/posts\/7197\/revisions\/7363"}],"wp:attachment":[{"href":"https:\/\/yanjingang.com\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=7197"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/yanjingang.com\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=7197"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/yanjingang.com\/blog\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=7197"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}