Definition
omp_get_wtime returns the elapsed wall clock time in seconds.
double omp_get_wtime();
Miscellaneous
C | Fortran-90
omp_get_wtime returns the elapsed wall clock time in seconds.
double omp_get_wtime();
The time elapsed, in seconds.
#include <stdio.h>
#include <stdlib.h>
#include <omp.h>
/**
* @brief Illustrates how to measure time using walltime.
* @details This code waits for a number of seconds given, by having a loop that
* checks how many seconds elapsed since it started, and keeps looping until
* enough seconds have passed by.
**/
int main(int argc, char* argv[])
{
// Time before the loop began
double start_time;
// Time right now
double current_time;
// Elapsed time since beginning of loop
double elapsed_time;
// Number of seconds to wait
double to_wait = 3;
// Initialise the start time
start_time = omp_get_wtime();
// Initialise the end time
current_time = omp_get_wtime();
// Initialise the elapsed time
elapsed_time = current_time - start_time;
// As long as fewer than "to_wait" seconds elapsed, keep looping
while(elapsed_time < to_wait)
{
// Get the new time
current_time = omp_get_wtime();
// Update the elapsed time
elapsed_time = current_time - start_time;
}
printf("%f seconds have elapsed.\n", elapsed_time);
return EXIT_SUCCESS;
}