如何在C ++中使用Sigar库获取CPU使用率 [英] How to get CPU usage percent in C++ using the Sigar libraries

问题描述

我想使用SIGAR库获得c ++中的CPU使用百分比，我写下面的代码试图获取这些信息，但有些事是错误的，我总是得到一个值0.3 ...而不是一个值在0％至100％之间。如何获得使用SIGAR库的CPU使用率百分比？

I'm trying to get the CPU usage percent in c++ using the SIGAR libraries, i wrote the code below to try to get this information, but something is wrong, i always got a value 0.3... instead of a value between 0% to 100 %. How to get the CPU usage percent with the SIGAR libraries?

#include <QDebug>
#include <sigar.h>
extern "C" 
{
#include <sigar_format.h>
}

int main(int argc, char *argv[])
{
    QCoreApplication a(argc, argv);

    sigar_cpu_t cpu1;
    sigar_cpu_t cpu2;
    sigar_cpu_perc_t perc;
    sigar_cpu_perc_calculate(&cpu1, &cpu2, &perc);
    qDebug() << perc.combined;

    return a.exec();
}

推荐答案

strong>：
我不是 Sigar 专家，这是我第一次听到它提到。从我从代码中可以看出， sigar_cpu_perc_calculate 根据cpu的两个快照之间的差异确定负载，不使用两个不同的CPU。

Edit: I am not a Sigar expert, it's the first time I hear it mentioned. From what I could figure out from the code, sigar_cpu_perc_calculate determines the load based on a difference between two "snapshots" of the cpu, not using two different CPUs.

我可以使用下面的方法看起来有些准确：

I was able to have something that looked somewhat accurate using the following:

sigar_t *sigar_cpu;
sigar_cpu_t old;
sigar_cpu_t current;

sigar_open(&sigar_cpu);
sigar_cpu_get(sigar_cpu, &old);

sigar_cpu_perc_t perc;

while(1)
{
    sigar_cpu_get(sigar_cpu, &current);
    sigar_cpu_perc_calculate(&old, &current, &perc);

    std::cout << "CPU " << perc.combined * 100 << "%\n";
    old = current;
    Sleep(100);
}

sigar_close(sigar_cpu);
return 0;

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