如何在Qt中测量功能运行时间？ [英] How to measure function running time in Qt?

问题描述

我正在调用 argon2 -Qt中的内存密集型哈希函数，并测量其运行时间：

I am calling argon2 - memory intensive hashing function in Qt and measuring its running time:

...
QTime start = QTime::currentTime();
// call hashing function
QTime finish = QTime::currentTime();
time = start.msecsTo(finish) / 1000.0;
...

在argon2库的测试案例中，时间是用另一种方式测量的： / p>

In argon2 library's test case, time is measured in another way:

...
clock_t start = clock();
// call hashing function
clock_t finish = clock();
time = ((double)finish - start) / CLOCKS_PER_SEC;
...

我正在完全按照他们在测试用例中调用的方式来调用该函数。但是我得到的数字要大两倍（慢两倍）。为什么？如何在Qt中测量功能运行时间？

I am calling the function exactly as they call in their test case. But I am getting a twice bigger number (twice slower). Why? How to measure function running time in Qt? What clock() actually measures?

env ：virtualBox，Ubuntu14.04 64bit，Qt5.2.1，Qt Creator 3.0.1。

env:virtualBox, Ubuntu14.04 64bit, Qt5.2.1, Qt Creator 3.0.1.

推荐答案

您还可以尝试使用QElapsedTimer：

You could also try to use the QElapsedTimer:

QElapsedTimer timer;
timer.start();

slowOperation1();

qDebug() << "The slow operation took" << timer.elapsed() << "milliseconds";
qDebug() << "The slow operation took" << timer.nsecsElapsed() << "nanoseconds";

QElapsed Timer的文档

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