/* Time measurement function for an empty function call.
returns time in nano-seconds upon success,
and -1 upon failure.
*/
double osm_function_time(unsigned int iterations){
struct timeval t1;
struct timeval t2;
if (iterations == 0)
{
iterations = DEFAULT_ITERATION;
}
if (gettimeofday(&t1, NULL) == -1) {
return -1;
}
for (unsigned int i = 0; i < iterations; i++) {
emptyFunc();
emptyFunc();
emptyFunc();
emptyFunc();
emptyFunc();
}
if (gettimeofday(&t2, NULL) == -1) {
return -1;
}
double s = CALCULATE_TIME(t1.tv_sec, t2.tv_sec);
double us = CALCULATE_TIME(t1.tv_usec, t2.tv_usec);
return TO_NANO(s, us);
}
/**
* 関数呼び出しのベンチマーク
* @return 計測時間(ms)
*/
double benchmarkCallFunc(){
clock_t start_time, end_time;
volatile int a = 1;
long i;
start_time = clock();
for(i = 0; i < BENCHMARK_SIZE; ++i){
a = emptyFunc();
}
end_time = clock();
return (double)(end_time - start_time)/CLOCKS_PER_SEC;
}
