// 2010年 08月 04日 星期三 17:09:13 CST
// author: 李小丹(Li Shao Dan) 字 殊恒(shuheng)
// K.I.S.S
// S.P.O.T

#include <iostream>
#include <cstdlib>
#include <cstdio>

#include <unistd.h>
#include <sys/times.h>

using namespace std;

#define CPU_FREQUENCY    2930000000UL

struct cpu_proc_click {
    unsigned long long cpu;
    unsigned long long proc;
};

static inline unsigned long long currentcycles();
static void inline get_cpu_proc(struct cpu_proc_click *);
static double inline get_cpu_rate(struct cpu_proc_click *);

int main()
{
    struct cpu_proc_click cpc[2];
    unsigned int count = 0;
    double rate = 0;
    for(;;) {
        get_cpu_proc(&cpc[0]);

        for(int i = 0; i < 999; ++i) {
            for(int j = 0; j < 99999; ++j)
                ++count;
        }
        usleep(80000);

        get_cpu_proc(&cpc[1]);

        rate = get_cpu_rate(cpc);
        cout << rate * 100 << endl;
    }
    return 0;
}

static inline unsigned long long currentcycles()
{
    unsigned long long ret;
    __asm__ __volatile__ ("rdtsc" : "=A" (ret));
    return ret;
}

static void inline get_cpu_proc(struct cpu_proc_click *cpc)
{
    struct tms tt;
    times(&tt);
    cpc->proc = tt.tms_utime + tt.tms_stime;
    cpc->cpu = currentcycles();
}

static double inline get_cpu_rate(struct cpu_proc_click *cpc)
{
    return ((double)(cpc[1].proc - cpc[0].proc)
        / ((cpc[1].cpu - cpc[0].cpu) * sysconf(_SC_CLK_TCK))) * CPU_FREQUENCY;
}