{"id":60,"date":"2020-12-30T13:39:22","date_gmt":"2020-12-30T13:39:22","guid":{"rendered":"http:\/\/blog.theopenpc.com\/?p=60"},"modified":"2026-07-23T15:27:07","modified_gmt":"2026-07-23T15:27:07","slug":"oprofile_intro","status":"publish","type":"post","link":"https:\/\/blog.theopenpc.com\/index.php\/2020\/12\/30\/oprofile_intro\/","title":{"rendered":"OProfile\u5c1d\u3002\u3002\u9c9c\uff1f\uff1f"},"content":{"rendered":"\n<p class=\"wp-block-paragraph\">\u6700\u8fd1\u4f7f\u7528\u4e86\u4e00\u4e2a\u53eb<strong><a href=\"https:\/\/oprofile.sourceforge.io\/about\/\" target=\"_blank\" rel=\"noreferrer noopener\">OProfile<\/a><\/strong>\u7684\u7528\u4e8e\u7a0b\u5e8f\u6027\u80fd\u6d4b\u8bd5\u7684\u5f00\u6e90\u9879\u76ee\uff0c\u5728\u8fd9\u91cc\u8bb0\u5f55\u4e00\u4e0b\u4f7f\u7528\u611f\u53d7\u548c\u5fc3\u5f97\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">\u4ec0\u4e48\u662fOProfile\uff1f<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">OProfile\u8bde\u751f\u4e8e2002\u5e74\uff0c\u5df2\u7ecf\u6709\u774018\u5e74\u7684\u5386\u53f2\u4e86\u3002\u8be5\u9879\u76ee\u4e3b\u8981\u7528\u4e8eLinux\u7cfb\u7edf\u7684\u6027\u80fd\u5256\u6790\uff0c\u91c7\u7528\u8bb0\u5f55CPU\u4e8b\u4ef6\uff08events\uff09\u7684\u65b9\u5f0f\uff0c\u6700\u7ec8\u7ed9\u4f7f\u7528\u8005\u63d0\u4f9b\u7a0b\u5e8f\u6216\u7cfb\u7edf\u7684\u6027\u80fd\u7edf\u8ba1\u6570\u636e\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">\u4e0b\u8f7d\u5b89\u88c5<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">OProfile\u53ef\u4ee5\u4ece<a rel=\"noreferrer noopener\" href=\"https:\/\/oprofile.sourceforge.io\/download\/\" target=\"_blank\">\u8fd9\u4e2a\u7f51\u7ad9<\/a>\u4e0b\u8f7d\uff0c\u5c0f\u7f16\u7528\u7684\u662f\u5199\u8fd9\u7bc7\u65f6\u6700\u65b0\u76841.4.0\u7248\u672c\u3002\u4e0b\u8f7d\u5b8c\u6210\u540e\u7528\u5982\u4e0b\u7b80\u5355\u547d\u4ee4\u7f16\u8bd1\u5b89\u88c5\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>.\/configure\nmake\nmake install<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\u7f16\u8bd1\u524d\u8bb0\u5f97\u5148\u88c5\u597dlibpopt\u548cbinutils\u7684\u5f00\u53d1\u5305\uff08Debian\u7cfb\u5bf9\u5e94\u7684\u662flibpopt-dev\u548cbinutils-dev\uff09\u3002\u5982\u679c\u4e0d\u60f3\u6298\u817e\u6e90\u7801\uff0cDebian\u7cfb\u7684\u7cfb\u7edf\u4e5f\u53ef\u4ee5\u76f4\u63a5sudo apt install oprofile\uff0c\u53ea\u662f\u7248\u672c\u4f1a\u65e7\u4e00\u4e9b\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u56e0\u4e3a\u4e3b\u8981\u7528\u4e8e\u76d1\u6d4bLinux\u7cfb\u7edf\u6027\u80fd\uff0c\u6240\u4ee5\u5f53\u7136\u53ea\u80fd\u5728Linux\u4e0a\u7f16\u8bd1\u5566\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u5c0f\u7f16\u6d4b\u8bd5\u73af\u5883\u4f7f\u7528\u7684\u662f\u5f53\u4e0b\u6d41\u884c\u7684\u6811\u8393\u6d3e3B+\uff0c\u7f16\u8bd1\u5668\u4f7f\u7528\u7684\u662fGCC 10\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">\u4f7f\u7528<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\u8001\u7248\u672c\u7684OProfile\u7528\u7684\u662fopcontrol\u52a0\u5185\u6838\u6a21\u5757\u90a3\u4e00\u5957\uff0c1.0\u4e4b\u540e\u5df2\u7ecf\u5f7b\u5e95\u5e9f\u5f03\u4e86\u3002\u73b0\u5728\u7684\u4e3b\u529b\u662f\u4e09\u4e2a\u547d\u4ee4\uff1aoperf\uff08\u91c7\u6837\uff09\u3001opreport\uff08\u770b\u62a5\u544a\uff09\u548copannotate\uff08\u6807\u6ce8\u5230\u6e90\u7801\uff09\u3002\u5b83\u4eec\u5e95\u5c42\u7528\u7684\u662f\u5185\u6838\u7684perf_events\u63a5\u53e3\uff0c\u4e0d\u9700\u8981\u989d\u5916\u52a0\u8f7d\u5185\u6838\u6a21\u5757\uff0c\u666e\u901a\u7528\u6237\u5c31\u80fd\u5256\u6790\u81ea\u5df1\u7684\u7a0b\u5e8f\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">\u51c6\u5907\u4e00\u4e2a\u201c\u6709\u95ee\u9898\u201d\u7684\u7a0b\u5e8f<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">\u4e3a\u4e86\u8bd5\u7528\uff0c\u6211\u4eec\u5148\u5199\u4e00\u4e2a\u81ea\u5e26\u70ed\u70b9\u7684\u5c0f\u7a0b\u5e8f\u2014\u2014\u7ecf\u5178\u7684\u6734\u7d20\u77e9\u9635\u4e58\u6cd5\uff08matmul.c\uff09\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>#include &lt;stdio.h&gt;\n\n#define N 512\n\nstatic double a[N][N], b[N][N], c[N][N];\n\nstatic void mat_init(void)\n{\n    for (int i = 0; i &lt; N; i++)\n        for (int j = 0; j &lt; N; j++) {\n            a[i][j] = i + j;\n            b[i][j] = i - j;\n        }\n}\n\nstatic void mat_mul(void)\n{\n    for (int i = 0; i &lt; N; i++)\n        for (int j = 0; j &lt; N; j++)\n            for (int k = 0; k &lt; N; k++)\n                c[i][j] += a[i][k] * b[k][j];\n}\n\nint main(void)\n{\n    mat_init();\n    mat_mul();\n    printf(\"c[0][0] = %f\\n\", c[0][0]);\n    return 0;\n}<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\u7f16\u8bd1\u65f6\u8bb0\u5f97\u5e26\u4e0a-g\uff0c\u8fd9\u6837\u540e\u9762\u624d\u80fd\u628a\u91c7\u6837\u5bf9\u5e94\u56de\u6e90\u7801\uff1b\u4f18\u5316\u7167\u5e38\u5f00-O2\uff0c\u6bd5\u7adf\u6211\u4eec\u8981\u5256\u6790\u7684\u662f\u201c\u771f\u5b9e\u201d\u7684\u7a0b\u5e8f\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>gcc -O2 -g -o matmul matmul.c<\/code><\/pre>\n\n\n\n<h3 class=\"wp-block-heading\">\u7528operf\u91c7\u6837<\/h3>\n\n\n\n<pre class=\"wp-block-code\"><code>$ operf .\/matmul\noperf: Profiler started\nc[0][0] = 44608256.000000\n\nProfiling done.<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\u5c31\u8fd9\u4e48\u7b80\u5355\uff0c\u4e0d\u9700\u8981\u4efb\u4f55\u53c2\u6570\u3002\u91c7\u6837\u6570\u636e\u4f1a\u5199\u8fdb\u5f53\u524d\u76ee\u5f55\u4e0b\u7684oprofile_data\/\u91cc\uff0copreport\u7b49\u5de5\u5177\u9ed8\u8ba4\u4e5f\u4ece\u8fd9\u91cc\u8bfb\u53d6\u3002\u9ed8\u8ba4\u91c7\u6837\u7684\u4e8b\u4ef6\u662fCPU_CYCLES\uff0c\u4e5f\u5c31\u662f\u201c\u8fd9\u6bb5\u65f6\u95f4CPU\u7684\u5468\u671f\u90fd\u82b1\u5728\u54ea\u4e86\u201d\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">\u7528opreport\u770b\u62a5\u544a<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">\u5148\u770b\u6574\u4f53\u60c5\u51b5\uff08\u4ee5\u4e0b\u8f93\u51fa\u4e3a\u6458\u5f55\uff0c\u5177\u4f53\u6570\u5b57\u5728\u4e0d\u540c\u73af\u5883\u4e0b\u4f1a\u4e0d\u4e00\u6837\uff0c\u4e0b\u540c\uff09\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>$ opreport\nCPU: ARM Cortex-A53, speed 1400 MHz (estimated)\nCounted CPU_CYCLES events (Cycle) with a unit mask of 0x00 (No unit mask) count 100000\nCPU_CYCLES:100000|\n  samples|      %|\n------------------\n    41273 98.6120 matmul\n      412  0.9844 libc-2.28.so\n      169  0.4037 ld-2.28.so<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\u518d\u7528-l\u7ec6\u5316\u5230\u51fd\u6570\u7ea7\u522b\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>$ opreport -l .\/matmul\nCPU: ARM Cortex-A53, speed 1400 MHz (estimated)\nCounted CPU_CYCLES events (Cycle) with a unit mask of 0x00 (No unit mask) count 100000\nsamples  %        symbol name\n41109    99.6027  mat_mul\n164       0.3973  mat_init<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">99.6%\u7684\u5468\u671f\u90fd\u82b1\u5728mat_mul\u91cc\u2014\u2014\u70ed\u70b9\u4e00\u76ee\u4e86\u7136\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">\u7528opannotate\u5bf9\u5e94\u5230\u6e90\u7801<\/h3>\n\n\n\n<pre class=\"wp-block-code\"><code>$ opannotate --source .\/matmul\n...\n               :static void mat_mul(void)\n               :{\n     3  0.0073 :    for (int i = 0; i &lt; N; i++)\n   214  0.5206 :        for (int j = 0; j &lt; N; j++)\n  2163  5.2616 :            for (int k = 0; k &lt; N; k++)\n 38729 94.2105 :                c[i][j] += a[i][k] * b[k][j];\n               :}<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\u53ef\u4ee5\u770b\u5230\u7edd\u5927\u90e8\u5206\u91c7\u6837\u90fd\u843d\u5728\u6700\u5185\u5c42\u90a3\u4e00\u884c\u4e58\u52a0\u4e0a\u3002\u8fd9\u4e00\u6b65\u80fd\u5de5\u4f5c\u7684\u524d\u63d0\uff0c\u5c31\u662f\u524d\u9762\u7f16\u8bd1\u65f6\u5e26\u4e0a\u7684\u90a3\u4e2a-g\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">\u6362\u4e2a\u4e8b\u4ef6\uff1a\u770b\u770bcache<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">CPU_CYCLES\u80fd\u544a\u8bc9\u4f60\u201c\u6162\u5728\u54ea\u201d\uff0c\u4f46\u4e0d\u89e3\u91ca\u201c\u4e3a\u4ec0\u4e48\u6162\u201d\u3002\u7528ophelp\u53ef\u4ee5\u5217\u51fa\u5f53\u524dCPU\u652f\u6301\u7684\u6240\u6709\u4e8b\u4ef6\uff0c\u6811\u8393\u6d3e3B+\u7684Cortex-A53\u4e0a\u5c31\u6709L1D_CACHE_REFILL\uff08L1\u6570\u636e\u7f13\u5b58\u672a\u547d\u4e2d\uff09\u8fd9\u7c7b\u4e8b\u4ef6\u3002\u6211\u4eec\u7528\u5b83\u518d\u91c7\u4e00\u6b21\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>$ operf -e L1D_CACHE_REFILL:10000 .\/matmul\n$ opreport -l .\/matmul<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\u6734\u7d20\u77e9\u9635\u4e58\u6cd5\u5bf9b[k][j]\u7684\u8bbf\u95ee\u5728\u5185\u5b58\u91cc\u662f\u8df3\u7740\u8d70\u7684\uff0c\u7f13\u5b58\u547d\u4e2d\u7387\u5f88\u5dee\u3002\u628a\u4e09\u91cd\u5faa\u73af\u4ecei-j-k\u6362\u6210i-k-j\u7684\u987a\u5e8f\u518d\u5404\u8dd1\u4e00\u904d\u5bf9\u6bd4\uff0c\u5c0f\u7f16\u73af\u5883\u91ccL1D_CACHE_REFILL\u7684\u91c7\u6837\u6570\u5dee\u4e86\u63a5\u8fd1\u4e00\u4e2a\u6570\u91cf\u7ea7\uff0c\u8fd0\u884c\u65f6\u95f4\u4e5f\u7f29\u77ed\u4e86\u4e00\u5927\u534a\u3002\u5148\u7528\u5468\u671f\u5b9a\u4f4d\u70ed\u70b9\uff0c\u518d\u6362\u4e8b\u4ef6\u89e3\u91ca\u70ed\u70b9\u2014\u2014\u8fd9\u57fa\u672c\u5c31\u662f\u6027\u80fd\u5256\u6790\u7684\u6807\u51c6\u5957\u8def\u4e86\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">\u7cfb\u7edf\u7ea7\u5256\u6790<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">\u9664\u4e86\u76ef\u7740\u5355\u4e2a\u7a0b\u5e8f\uff0coperf\u4e5f\u53ef\u4ee5\u5256\u6790\u6574\u4e2a\u7cfb\u7edf\uff08\u9700\u8981root\uff09\uff0cCtrl-C\u7ed3\u675f\u91c7\u6837\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>$ sudo operf --system-wide\n\uff08\u8dd1\u4e00\u4f1a\u513f\u4f60\u60f3\u89c2\u5bdf\u7684\u8d1f\u8f7d\uff0c\u7136\u540eCtrl-C\uff09\n$ sudo opreport<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\u9002\u5408\u56de\u7b54\u201c\u8fd9\u53f0\u673a\u5668\u7684CPU\u5230\u5e95\u88ab\u8c01\u5403\u4e86\u201d\u8fd9\u7c7b\u95ee\u9898\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">\u4f7f\u7528\u611f\u53d7\u548c\u5fc3\u5f97<\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u4e0a\u624b\u5f88\u5feb\uff1aoperf \u2192 opreport \u2192 opannotate\u4e09\u677f\u65a7\u5c31\u80fd\u8986\u76d6\u5927\u90e8\u5206\u573a\u666f\uff0c\u8f93\u51fa\u5168\u662f\u7eaf\u6587\u672c\uff0c\u5728\u53ea\u6709\u4e32\u53e3\u7684\u5d4c\u5165\u5f0f\u677f\u5b50\u4e0a\u7528\u8d77\u6765\u4e5f\u5f88\u8212\u670d\u3002<\/li>\n\n\n\n<li>\u9879\u76ee\u786e\u5b9e\u8001\u4e86\uff1a\u6587\u6863\u548c\u793e\u533a\u90fd\u6bd4\u8f83\u51b7\u6e05\uff0c\u7f51\u4e0a\u641c\u5230\u7684\u8d44\u6599\u4e00\u591a\u534a\u8fd8\u5728\u8bb2\u5df2\u7ecf\u5e9f\u5f03\u7684opcontrol\uff0c\u7167\u7740\u6284\u662f\u8dd1\u4e0d\u8d77\u6765\u7684\u2014\u2014\u8ba4\u51c6operf\u5c31\u597d\u3002<\/li>\n\n\n\n<li>\u751f\u6001\u4e0d\u5982perf\uff1a\u5982\u4ecaoperf\u548cperf\u5e95\u5c42\u7528\u7684\u662f\u540c\u4e00\u5957perf_events\u673a\u5236\uff0c\u4f46perf\u6709\u706b\u7130\u56fe\u7b49\u4e00\u6574\u5957\u751f\u6001\u3002\u5982\u679c\u4f60\u7528\u7684\u662fx86\u670d\u52a1\u5668\uff0c\u76f4\u63a5\u4e0aperf\u53ef\u80fd\u66f4\u7701\u5fc3\u3002<\/li>\n\n\n\n<li>ARM\u677f\u5b50\u4e0a\u8981\u770b\u5185\u6838\u8138\u8272\uff1a\u80fd\u4e0d\u80fd\u91c7\u6837\u53d6\u51b3\u4e8e\u5185\u6838\u6709\u6ca1\u6709\u542f\u7528PMU\uff08\u8bbe\u5907\u6811\u91cc\u8981\u6709arm-pmu\u8282\u70b9\uff09\u3002\u5982\u679coperf\u62a5\u9519\u8bf4\u4e0d\u652f\u6301\u4f60\u7684\u5904\u7406\u5668\uff0c\u5148\u53bb\u67e5\u5185\u6838\u914d\u7f6e\uff0c\u800c\u4e0d\u662f\u6000\u7591\u4eba\u751f\u3002<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">\u603b\u7684\u6765\u8bf4\uff0c\u201c\u9c9c\u201d\u662f\u8c08\u4e0d\u4e0a\u4e86\u2014\u2014\u8fd9\u4e2a2002\u5e74\u51fa\u751f\u7684\u9879\u76ee\u4eca\u5e74\u90fd18\u5c81\u4e86\u3002\u4f46\u5728\u6811\u8393\u6d3e\u8fd9\u7c7b\u5d4c\u5165\u5f0fLinux\u73af\u5883\u91cc\uff0c\u60f3\u5feb\u901f\u56de\u7b54\u201c\u54ea\u4e2a\u51fd\u6570\u6700\u70ed\u201d\u7684\u95ee\u9898\uff0cOProfile\u8fd9\u5957\u7b80\u5355\u76f4\u63a5\u7684\u6587\u672c\u5de5\u4f5c\u6d41\u4f9d\u7136\u5f88\u80fd\u6253\u3002\u8001\u5c06\u51fa\u9a6c\uff0c\u4e00\u4e2a\u9876\u4fe9\u3002<\/p>\n\n","protected":false},"excerpt":{"rendered":"<p>\u6700\u8fd1\u4f7f\u7528\u4e86\u4e00\u4e2a\u53ebOProfile\u7684\u7528\u4e8e\u7a0b\u5e8f\u6027\u80fd\u6d4b\u8bd5\u7684\u5f00\u6e90\u9879\u76ee\uff0c\u5728\u8fd9\u91cc\u8bb0\u5f55\u4e00\u4e0b\u4f7f\u7528\u611f\u53d7\u548c\u5fc3\u5f97\u3002 \u4ec0\u4e48\u662fOProfile\uff1f 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