sysconf(_SC_CLK_TCK)与CLOCKS_PER_SEC [英] sysconf(_SC_CLK_TCK) vs. CLOCKS_PER_SEC

问题描述

我想知道上述常量的返回值之间有什么区别.

I was wondering what is the difference between the return value of the aforementioned constants.

sysconf(_SC_CLK_TCK)返回100
CLOCKS_PER_SEC返回1,000,000

sysconf(_SC_CLK_TCK) returns 100
CLOCKS_PER_SEC returns 1,000,000

所以，假设我有这个:

...
start = clock();
// Process starts here 
/* does something */
// Process ends here
end = clock();
double time = ((double) end-start)/CLOCK_PER_SEC; // this would return in seconds
...

如何计算流程使用的滴答数而不是时间?我是否将时间用于sysconf(_SC_CLK_TCK)或CLOCK_PER_SEC?

How do I calculate the amount of ticks used by the process, instead of the time? Do I use time used against sysconf(_SC_CLK_TCK) or CLOCK_PER_SEC?

我正试图了解它们的用法.

I am trying to understand the usage of those.

推荐答案

根据文档， clock()返回的时间分辨率为 CLOCKS_PER_SEC .

As per the documentation, clock() returns time in resolution of CLOCKS_PER_SEC.

其他时间函数返回的精度为 tick 的值. sysconf(_SC_CLK_TCK)提供每秒的滴答数.这样的时间函数之一就是 times().

Other time functions return values with resolution in ticks. sysconf(_SC_CLK_TCK) provides the number of ticks per second. One such time function is times().

这篇关于sysconf(_SC_CLK_TCK)与CLOCKS_PER_SEC的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！