如何在Visual C ++中以ns，ps或clk周期衡量执行时间？

Question

有没有一种方法可以衡量在Visual C ++中我的C ++代码的特定部分花费了多少时间？

Answer 1

Do you need it for debug only or do you need it for the application you are making? I can tell you a technique for debug only:

• Put breakpoint in the starting code line and another in final one.
• When the execution stops at the first breakpoint, in the Watch Window watch for the $clk variable.
• It almost certainly has a value different of Zero. Define it to Zero.
• Then wait for the execution to flow to the second breakpoint. Now look to the Watch Window and the $clk variable has the time elapsed.