获取cpu频率的代码

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taskset是linux自带的一个命令，可用来将进程绑定到指定CPU
相关的函数有: sched_setaffinity, CPU_CLR, CPU_ISSET, CPU_SET, CPU_ZERO

// cpufreq库可在/usr/lib目录下找到// 编译: g++ -g -o x x.cpp -lcpufreq// 需要以root用户执行以下代码//#include <cpufreq.h>#include <stdio.h>#include <sys/sysinfo.h> // get_nprocs// 如果不存在/usr/include/cpufreq.h#ifndef _CPUFREQ_H    extern "C" int cpufreq_cpu_exists(unsigned int cpu);    extern "C" unsigned long cpufreq_get_freq_kernel(unsigned int cpu);    extern "C" unsigned long cpufreq_get_freq_hardware(unsigned int cpu);    extern "C" int cpufreq_get_hardware_limits(unsigned int cpu, unsigned long *min, unsigned long *max);#endifint main(){    // 取得cpu core的个数，proc是processor的意思    int nprocs = get_nprocs();    for (int i=0; i<nprocs; ++i)    {        if (0 == cpufreq_cpu_exists(i))        {               unsigned long min_freq = 0;            unsigned long max_freq = 0;            cpufreq_get_hardware_limits(i, &min_freq, &max_freq);            printf("cpu[%d]:\n", i);             printf("min_freq: %lu, max_freq: %lu\n", min_freq, max_freq);            printf("kernel freq: %lu, hardware freq: %lu\n", cpufreq_get_freq_kernel(i), cpufreq_get_freq_hardware(i));            printf("\n");        }       }       return 0;}

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