Elapsed Seconds: Example and Test

elapsed_seconds.cpp

Headings

@(@\newcommand{\W}[1]{ \; #1 \; } \newcommand{\R}[1]{ {\rm #1} } \newcommand{\B}[1]{ {\bf #1} } \newcommand{\D}[2]{ \frac{\partial #1}{\partial #2} } \newcommand{\DD}[3]{ \frac{\partial^2 #1}{\partial #2 \partial #3} } \newcommand{\Dpow}[2]{ \frac{\partial^{#1}}{\partial {#2}^{#1}} } \newcommand{\dpow}[2]{ \frac{ {\rm d}^{#1}}{{\rm d}\, {#2}^{#1}} }@)@ Elapsed Seconds: Example and Test

# include <cppad/utility/elapsed_seconds.hpp>

# include <iostream>
# include <algorithm>
# include <cmath>

# define CPPAD_DEBUG_ELAPSED_SECONDS 0

bool elapsed_seconds(void)
{     bool ok = true;

     double max_diff = 0.;
     double s0 = CppAD::elapsed_seconds();
     double s1 = CppAD::elapsed_seconds();
     double s2 = CppAD::elapsed_seconds();
     while(s2 - s0 < 1.)
     {     max_diff = std::max(s2 - s1, max_diff);
          s1 = s2;
          s2 = CppAD::elapsed_seconds();

     }
# if CPPAD_DEBUG_ELAPSED_SECONDS
     std::cout << "max_diff = " << max_diff << std::endl;
# endif
     ok &= 0. < max_diff && max_diff < .04;
     return ok;
}

Input File: speed/example/elapsed_seconds.cpp