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现在我能够将 PAPI 用于系统指标，但只能在应用程序中使用。结构是——初始化库——创建事件——启动事件（指令总数和/或周期总数）——工作负载（应用程序的代码）——停止事件（返回测量值）。但是我想采用不同的方法，例如-初始化库-创建事件-启动事件（指令总数和/或周期总数）-“睡眠”-停止事件（返回测量值）。所以基本上我想在一个终端中运行一个程序，在另一个终端（睡眠）中运行 PAPI 实现，并能够获得测量结果。

下面显示了第一个结构：

#include <iostream>
#include <papi.h>

void powersOfOne(int);

 int main()
{
    int retval;
     retval = PAPI_library_init(PAPI_VER_CURRENT);
    if (retval != PAPI_VER_CURRENT)
    {
        std::cerr << "PAPI: init. failed: " << PAPI_strerror(retval) << std::endl;
        return 1;
    }
        /* set up event set */
        int eventset = PAPI_NULL;
     retval = PAPI_create_eventset(&eventset);
    if (retval != PAPI_OK)
    {
        std::cerr << "PAPI: could not create eventset: " << PAPI_strerror(retval) << std::endl;
        return 1;
    }


//adding total_cycles and total_instructions to event
    retval = PAPI_add_named_event(eventset, "PAPI_TOT_CYC");
    if (retval != PAPI_OK)
        {
        std::cerr << "PAPI: could not add PAPI_TOT_CYC: " << PAPI_strerror(retval) << std::endl;
    }

    retval = PAPI_add_named_event(eventset, "PAPI_TOT_INS");
    if (retval != PAPI_OK)
        {
        std::cerr << "PAPI: could not add PAPI_TOT_INS: " << PAPI_strerror(retval) << std::endl;
    }
  /* sample */
        long long count;
    PAPI_reset(eventset);
    retval = PAPI_start(eventset);
    if (retval != PAPI_OK)
        std::cerr << "PAPI: could not START sample: " << PAPI_strerror(retval) << std::endl;

    /* the workload */

    powersOfOne(10);


//stopping eventset
    retval = PAPI_stop(eventset, count);
    if (retval != PAPI_OK)
        std::cerr << "PAPI: could not STOP sample: " << PAPI_strerror(retval) << std::endl;

    std::cout << "PAPI: measured " << count << " cycles" << std::endl;
    std::cout << "PAPI: measured " << count << " instructions" << std::endl;


        /* (optional) cleanup */
        PAPI_cleanup_eventset(eventset);
    PAPI_destroy_eventset(&eventset);


     return 0;
}

void powersOfOne(int num){
        int val = 1;
        for (int i = 1; i < num; i++){
                val*=1;
        }
        std::cout << val << std::endl;
}
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