{"id":5607,"date":"2025-01-13T19:12:54","date_gmt":"2025-01-13T11:12:54","guid":{"rendered":"http:\/\/www.wangkaixuan.tech\/?p=5607"},"modified":"2025-01-14T20:01:02","modified_gmt":"2025-01-14T12:01:02","slug":"linux%e6%97%b6%e9%92%9f%e7%b3%bb%e5%88%97-04-%e4%bb%8ecpu%e4%b8%bb%e9%a2%91%e5%88%b0%e7%b3%bb%e7%bb%9f%e6%97%b6%e9%97%b4","status":"publish","type":"post","link":"http:\/\/www.wangkaixuan.tech\/?p=5607","title":{"rendered":"LINUX\u65f6\u949f\u7cfb\u5217-04-\u4eceCPU\u4e3b\u9891\u5230\u7cfb\u7edf\u65f6\u95f4"},"content":{"rendered":"\n

\u9996\u5148\u6211\u4eec\u4ece\u4e00\u4e2a\u5b9e\u9a8c\u5f00\u59cb\uff1a<\/p>\n\n\n\n

#define _GNU_SOURCE\n\n#include <sched.h>\n#include <pthread.h>\n#include <stdio.h>\n#include <unistd.h>\n#include <stdlib.h> \n#include <stdint.h>\n#include <time.h>\n#include <sys\/time.h>\n\n\/\/ gcc -o rdtsc rdtsc.c -lpthread -std=c99\n\nuint64_t get_tsc()\n{\n    uint64_t a, d;\n    __asm__ volatile(\"rdtsc\" : \"=a\"(a), \"=d\"(d));\n    return (d << 32) | a;\n}\n\nvoid bind_cpu(int cpuid)\n{\n    cpu_set_t cpuset;\n\n    CPU_ZERO(&cpuset);\n    CPU_SET(cpuid, &cpuset);\n\n    pthread_t tid = pthread_self();\n    \n    pthread_setaffinity_np(tid, sizeof(cpuset), &cpuset);\n}\n\n#define     CPU_NUM             16\n\nuint64_t    cpuid_tsc[CPU_NUM];\n\nint         epoch               = 0;\n\nvoid* thread_func(void* arg) \n{\n    int cpuid = *((int*)arg);\n\n    bind_cpu(cpuid);\n    \n    int old = epoch;\n    while(1)\n    {\n        if (old == epoch)\n            continue;\n        \n        old = epoch;\n        \n        uint64_t tsc = get_tsc();\n        uint64_t diff = tsc - cpuid_tsc[cpuid];\n\n        printf(\"cpuid=%2d, tsc=%llu, diff=%llu\\n\", cpuid, tsc, diff);\n        \n        cpuid_tsc[cpuid] = tsc;\n    }\n\n    return NULL;\n}\n\nint main()\n{\n    \/\/ \u542f\u52a8\u7ebf\u7a0b\n    int cpuids[CPU_NUM];\n    for (int i = 0; i < CPU_NUM; ++i)\n    {\n        pthread_t tid;\n        cpuids[i] = i;\n        pthread_create(&tid, NULL, thread_func, &cpuids[i]);\n    }\n    \/\/ \u521d\u59cb\u5316tsc\n    sleep(1);\n    for (int i = 0; i < CPU_NUM; ++i)\n        cpuid_tsc[i] = get_tsc();\n    \/\/ \u6d4b\u8bd5\n    while(1)\n    {\n        sleep(1);\n        printf(\"\\n\");\n        ++epoch;\n    }\n\n    return 0;\n}<\/code><\/pre>\n\n\n\n
\u5148\u5728\u4e00\u4e2a16\u6838\u7684\u673a\u5668\u4e0a\u8fd0\u884c\u4e00\u4e0b\uff1a<\/p>\n\n\n\n
\"\"<\/figure>\n\n\n\n
\u8fd0\u884c\u7ed3\u679c\u5982\u4e0b\uff1a<\/p>\n\n\n\n
\"\"<\/figure>\n\n\n\n
\"\"<\/figure>\n\n\n\n
\u518d\u6362\u4e00\u53f072\u6838\u7684\u673a\u5668\uff1a<\/p>\n\n\n\n
\"\"<\/figure>\n\n\n\n
\u8fd0\u884c\u7ed3\u679c\u5982\u4e0b\uff1a<\/p>\n\n\n\n
\"\"<\/figure>\n\n\n\n
\"\"<\/figure>\n\n\n\n
\u89c2\u5bdf\u8fd9\u4e24\u53f0\u673a\u5668\u7684\u8fd0\u884c\u7ed3\u679c\uff0c\u6211\u4eec\u53d1\u73b0\u4e86\u4e09\u70b9\uff1a<\/p>\n\n\n\n
1.\u7ed1\u5b9a\u5728\u4e0d\u540cCPU\u6838\u5fc3\u4e0a\u7684\u7a0b\u5e8f\uff0c\u540c\u4e00\u65f6\u523b\u8bfb\u53d6\u5230\u7684tsc\u7684\u503c\u90fd\u5dee\u4e0d\u591a\uff08\u5373\u4f7f\u4ed6\u4eec\u4f4d\u4e8e\u4e24\u9897CPU\u4e0a\uff01\uff09<\/p>\n\n\n\n
2.tsc\u7684\u503c\u57fa\u672c\u4e0a\u6309\u7167CPU\u7684\u6807\u79f0\u9891\u7387\u589e\u52a0<\/p>\n\n\n\n
3.tsc\u7684\u503c\u8ddf\u673a\u5668\u7684\u542f\u52a8\u65f6\u95f4\u6709\u5173\uff08uptime\uff09<\/p>\n","protected":false},"excerpt":{"rendered":"
\u9996\u5148\u6211\u4eec\u4ece\u4e00\u4e2a\u5b9e\u9a8c\u5f00\u59cb\uff1a \u5148\u5728\u4e00\u4e2a16\u6838\u7684\u673a\u5668\u4e0a\u8fd0\u884c\u4e00\u4e0b\uff1a \u8fd0\u884c\u7ed3\u679c\u5982\u4e0b\uff1a \u518d\u6362\u4e00\u53f072\u6838\u7684\u673a\u5668\uff1a \u8fd0\u884c\u7ed3\u679c\u5982\u4e0b\uff1a \u89c2\u5bdf\u8fd9\u4e24\u53f0\u673a\u5668\u7684\u8fd0\u884c\u7ed3\u679c\uff0c\u6211\u4eec\u53d1\u73b0\u4e86\u4e09\u70b9\uff1a …<\/p>\n
 Read More  Read More<\/span><\/a><\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[14],"tags":[],"class_list":["post-5607","post","type-post","status-publish","format-standard","hentry","category-05-01-"],"_links":{"self":[{"href":"http:\/\/www.wangkaixuan.tech\/index.php?rest_route=\/wp\/v2\/posts\/5607","targetHints":{"allow":["GET"]}}],"collection":[{"href":"http:\/\/www.wangkaixuan.tech\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/www.wangkaixuan.tech\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/www.wangkaixuan.tech\/index.php?rest_route=\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"http:\/\/www.wangkaixuan.tech\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=5607"}],"version-history":[{"count":4,"href":"http:\/\/www.wangkaixuan.tech\/index.php?rest_route=\/wp\/v2\/posts\/5607\/revisions"}],"predecessor-version":[{"id":5618,"href":"http:\/\/www.wangkaixuan.tech\/index.php?rest_route=\/wp\/v2\/posts\/5607\/revisions\/5618"}],"wp:attachment":[{"href":"http:\/\/www.wangkaixuan.tech\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=5607"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/www.wangkaixuan.tech\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=5607"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/www.wangkaixuan.tech\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=5607"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}