{"id":4053,"date":"2018-08-10T13:59:27","date_gmt":"2018-08-10T05:59:27","guid":{"rendered":"https:\/\/ixyzero.com\/blog\/?p=4053"},"modified":"2018-08-11T07:08:56","modified_gmt":"2018-08-10T23:08:56","slug":"%e7%81%ab%e7%84%b0%e5%9b%beflamegraph%e7%9a%84%e7%ae%80%e5%8d%95%e5%ad%a6%e4%b9%a0","status":"publish","type":"post","link":"https:\/\/ixyzero.com\/blog\/archives\/4053.html","title":{"rendered":"\u706b\u7130\u56fe(FlameGraph)\u7684\u7b80\u5355\u5b66\u4e60"},"content":{"rendered":"<p>=Start=<\/p>\n<h4 id=\"id-\u6a21\u677f-\u7f18\u7531\uff1a\">\u7f18\u7531\uff1a<\/h4>\n<p>\u6700\u8fd1\u5728\u5bf9\u5185\u90e8\u4e00\u4e9b\u9879\u76ee\u505a\u6027\u80fd\u538b\u6d4b\u7684\u8fc7\u7a0b\u4e2d\u7b80\u5355\u63a5\u89e6\u4e86\u4e00\u4e0b\u300c<a href=\"http:\/\/www.brendangregg.com\/FlameGraphs\/cpuflamegraphs.html\" target=\"_blank\" rel=\"noopener\">\u706b\u7130\u56fe<\/a>\u300d\u7684\u6982\u5ff5\u3002\u8fd9\u91cc\u7b80\u5355\u8bb0\u5f55\u4e00\u4e0b\uff0c\u65b9\u4fbf\u4ee5\u540e\u5feb\u901f\u53c2\u8003\u3002<\/p>\n<h4 id=\"id-\u6a21\u677f-\u6b63\u6587\uff1a\">\u6b63\u6587\uff1a<\/h4>\n<h5 id=\"id-\u6a21\u677f-\u53c2\u8003\u89e3\u7b54\uff1a\">\u53c2\u8003\u89e3\u7b54\uff1a<\/h5>\n<h6><strong># \u706b\u7130\u56fe\u662f\u4ec0\u4e48\uff1f<\/strong><\/h6>\n<p><span style=\"color: #ff0000;\">\u706b\u7130\u56fe \u662f\u57fa\u4e8e perf\u547d\u4ee4\u7ed3\u679c \u4ea7\u751f\u7684 SVG\u56fe\u7247\uff0c\u7528\u6765\u5c55\u793a CPU \u7684\u8c03\u7528\u6808\u3002<\/span><\/p>\n<h6><strong># \u706b\u7130\u56fe\u600e\u4e48\u770b\uff1f<\/strong><\/h6>\n<ul>\n<li><span style=\"color: #ff0000;\"><strong>Y\u8f74 \u8868\u793a \u8c03\u7528\u6808<\/strong><\/span>\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\uff1b<\/li>\n<li><span style=\"color: #ff0000;\"><strong>X\u8f74 \u8868\u793a \u62bd\u6837\u6570<\/strong><\/span>\uff0c<span style=\"color: #ff0000;\">\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\u8d8a\u591a\uff0c\u5373\u6267\u884c\u7684\u65f6\u95f4\u957f\u3002<\/span><\/li>\n<\/ul>\n<p><span style=\"color: #ff0000;\"><strong>\u706b\u7130\u56fe\u91cc\u9762\u7684\u989c\u8272\u662f\u968f\u673a\u9009\u53d6\u7684\uff0c\u5e76\u6ca1\u6709\u7279\u6b8a\u542b\u4e49\u3002<\/strong><\/span><\/p>\n<p><strong>\u706b\u7130\u56fe\u4e3b\u8981\u5c31\u662f\u770b\u9876\u5c42\u7684\u54ea\u4e2a\u51fd\u6570\u5360\u636e\u7684\u5bbd\u5ea6\u6700\u5927\u3002<\/strong>\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<h6><strong># \u5982\u4f55\u751f\u6210\u706b\u7130\u56fe\uff1f<\/strong><\/h6>\n<p>\u4e0b\u9762\u4ee5\u4e00\u4e2a\u7b80\u5355\u7684C\u7a0b\u5e8f\u4e3a\u4f8b\uff0c\u4ecb\u7ecd\u4e00\u4e0b\u706b\u7130\u56fe\u7684\u751f\u6210\u6d41\u7a0b\uff1a<\/p>\n<pre class=\"lang:default decode:true \"># \u7ec8\u7aef\u4e00\r\n\r\n0\u3001\u7f16\u8f91\u3001\u7f16\u8bd1\u3001\u94fe\u63a5\uff0c\u51c6\u5907\u89e3\u6790\u5de5\u5177\/\u811a\u672c\r\nvim test.c\r\ngcc test.c -o test.out\r\ngit clone https:\/\/github.com\/brendangregg\/FlameGraph\r\n\r\n1\u3001\u542f\u52a8\u6267\u884c\r\n.\/test.out\r\n\r\n# \u7ec8\u7aef\u4e8c\r\n\r\n2\u3001\u7528 `perf record` \u547d\u4ee4\u6765\u91c7\u96c6\u6570\u636e\r\n[sudo] perf record -p $(pgrep test.out) -F 999 -a -g -- sleep 20\r\n\r\n\u9009\u9879\u91ca\u4e49\uff1a\r\n-p \u7528\u4e8e\u6307\u5b9a\u8981\u91c7\u96c6\u7684\u5177\u4f53\u8fdb\u7a0bpid\uff1b\r\n-F \u7528\u4e8e\u6307\u5b9a\u91c7\u6837\u9891\u7387\u4e3a 999Hz(\u6bcf\u79d2999\u6b21) \uff0c\u5982\u679c 999\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\uff1b\r\n-a \u7528\u4e8e\u8868\u793a\u4ece\u6240\u6709CPU\u4e2d\u8fdb\u884c\u91c7\u96c6\uff1b\r\n-g \u7528\u4e8e\u8868\u793a\u8bb0\u5f55\u8c03\u7528\u6808\uff1b\r\nsleep 20 \u7528\u4e8e\u6307\u5b9a\u6301\u7eed\u91c7\u96c620\u79d2\uff1b\r\n-e \u7528\u4e8e\u6307\u5b9a\u91c7\u96c6\u4e8b\u4ef6\uff0c\u5982\u679c\u6ca1\u6709\u5219\u9ed8\u8ba4\u91c7\u96c6cycles(\u5373 CPU clock \u5468\u671f)\uff1b\r\n\r\n\u8865\u5145\u8bf4\u660e\uff1a\r\n\u4e0a\u9762\u7684 perf record \u547d\u4ee4\u6267\u884c\u5b8c\u6210\u540e\uff0c\u4f1a\u5728\u5f53\u524d\u7684\u76ee\u5f55\u4e0b\u751f\u6210 perf.data \u6587\u4ef6\u3002\r\n\r\n3\u3001\u7528 `perf script` \u547d\u4ee4\u89e3\u6790(perf.data\u6587\u4ef6)\u6570\u636e\u4ee5\u751f\u6210\u5806\u6808\u4fe1\u606f\r\nperf script &gt; out.stack\r\n\r\n4\u3001\u6298\u53e0\u5806\u6808\r\n.\/FlameGraph\/stackcollapse-perf.pl out.stack &gt; out.folded\r\n\r\n5\u3001\u751f\u6210 svg \u56fe\r\n.\/FlameGraph\/flamegraph.pl out.folded &gt; test.svg\r\n\r\n# \u5728\u6d4f\u89c8\u5668\u4e2d\u8fdb\u884c\u67e5\u770b\u8be5 svg \u6587\u4ef6\r\n<\/pre>\n<p>&amp;<\/p>\n<pre class=\"lang:default decode:true \" title=\"FlameGraph_test.c\">#include &lt;stdio.h&gt;\r\n#include &lt;unistd.h&gt;\r\n\r\nint a1() { \/\/ 3w empty loops\r\n    int i = 0;\r\n    for(; i &lt; 30000; i++) {};\r\n}\r\n\r\nint a2() { \/\/ 2w empty loops\r\n    int i = 0;\r\n    for(; i &lt; 20000; i++) {};\r\n}\r\n\r\n\r\nint a() { \/\/ 50w empty loops\r\n    int i = 0;\r\n    for(; i &lt; 10; i++) {\r\n        a1();\r\n        a2();\r\n    };\r\n}\r\n\r\nint b() { \/\/ 20w empty loops\r\n    int i = 0;\r\n    for(; i &lt; 200000; ++i) {};\r\n}\r\n\r\nint c() {\r\n    sleep(1);\r\n}\r\n\r\nint d() { \/\/ 30w empty loops\r\n    int i = 0;\r\n    for(; i &lt; 300000; ++i) {};\r\n}\r\n\r\nvoid test() {\r\n    a();\r\n    b();\r\n    c();\r\n    d();\r\n}\r\n\r\n\r\nint main() {\r\n    while(1) test();\r\n    return 0;\r\n}<\/pre>\n<p>&nbsp;<\/p>\n<h5 id=\"id-\u6a21\u677f-\u53c2\u8003\u94fe\u63a5\uff1a\">\u53c2\u8003\u94fe\u63a5\uff1a<\/h5>\n<ul>\n<li><a href=\"http:\/\/www.ruanyifeng.com\/blog\/2017\/09\/flame-graph.html\">\u5982\u4f55\u8bfb\u61c2\u706b\u7130\u56fe\uff1f<\/a><\/li>\n<li><a href=\"https:\/\/blog.csdn.net\/gatieme\/article\/details\/78885908\">Linux\u4e0b\u7528\u706b\u7130\u56fe\u8fdb\u884c\u6027\u80fd\u5206\u6790<\/a><br \/>\n<a href=\"https:\/\/github.com\/gatieme\/LDD-LinuxDeviceDrivers\/tree\/master\/study\/debug\/tools\/perf\/flame_graph\">https:\/\/github.com\/gatieme\/LDD-LinuxDeviceDrivers\/tree\/master\/study\/debug\/tools\/perf\/flame_graph<\/a><\/li>\n<li><a href=\"https:\/\/blog.csdn.net\/oujiangping\/article\/details\/78580450\">\u706b\u7130\u56fe\u5206\u6790\u7a0b\u5e8f\u6027\u80fd<\/a><\/li>\n<li><a href=\"https:\/\/www.jianshu.com\/p\/7ec8378f1a3c\">\u5de5\u6b32\u6027\u80fd\u8c03\u4f18\uff0c\u5fc5\u5148\u5229\u5176\u5668\uff081\uff09<\/a><\/li>\n<li><a href=\"https:\/\/www.cnblogs.com\/tcicy\/p\/8491899.html\">\u5982\u4f55\u8bfb\u61c2\u706b\u7130\u56fe\uff1f<\/a><\/li>\n<li><a href=\"https:\/\/blog.csdn.net\/c395318621\/article\/details\/55224665\">JAVA\u6027\u80fd\u5206\u6790\u4e4b\u4f7f\u7528\u706b\u7130\u56fe<\/a><br \/>\n<a href=\"https:\/\/github.com\/cykl\/hprof2flamegraph\">https:\/\/github.com\/cykl\/hprof2flamegraph<\/a><\/li>\n<li><a href=\"http:\/\/wiki.jikexueyuan.com\/project\/openresty-best-practice\/how.html\">\u5982\u4f55\u5b9a\u4f4d\u95ee\u9898<\/a><\/li>\n<\/ul>\n<p>=END=<\/p>\n","protected":false},"excerpt":{"rendered":"<p>=Start= \u7f18\u7531\uff1a \u6700\u8fd1\u5728\u5bf9\u5185\u90e8\u4e00\u4e9b\u9879\u76ee\u505a\u6027\u80fd\u538b\u6d4b\u7684\u8fc7\u7a0b\u4e2d\u7b80\u5355\u63a5\u89e6\u4e86\u4e00\u4e0b\u300c\u706b\u7130\u56fe\u300d\u7684\u6982\u5ff5\u3002\u8fd9\u91cc\u7b80\u5355\u8bb0\u5f55\u4e00\u4e0b [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[23,11,7,12],"tags":[946,1195,30,1194],"class_list":["post-4053","post","type-post","status-publish","format-standard","hentry","category-knowledgebase-2","category-linux","category-programing","category-tools","tag-cpu","tag-flamegraph","tag-linux","tag-perf"],"views":10814,"_links":{"self":[{"href":"https:\/\/ixyzero.com\/blog\/wp-json\/wp\/v2\/posts\/4053","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/ixyzero.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/ixyzero.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/ixyzero.com\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/ixyzero.com\/blog\/wp-json\/wp\/v2\/comments?post=4053"}],"version-history":[{"count":2,"href":"https:\/\/ixyzero.com\/blog\/wp-json\/wp\/v2\/posts\/4053\/revisions"}],"predecessor-version":[{"id":4055,"href":"https:\/\/ixyzero.com\/blog\/wp-json\/wp\/v2\/posts\/4053\/revisions\/4055"}],"wp:attachment":[{"href":"https:\/\/ixyzero.com\/blog\/wp-json\/wp\/v2\/media?parent=4053"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/ixyzero.com\/blog\/wp-json\/wp\/v2\/categories?post=4053"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/ixyzero.com\/blog\/wp-json\/wp\/v2\/tags?post=4053"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}