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time_bench.cc
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time_bench.cc
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#include <stdio.h>
#include <stdlib.h>
#include <time.h>
#include <sys/time.h>
#include <unistd.h>
#include <iostream>
#include <stdint.h>
uint64_t GetTimeStampInUs() {
struct timeval tv = {0, 0};
gettimeofday(&tv, NULL);
return tv.tv_sec * 1000000 + tv.tv_usec;
}
int main(int argc, char* argv[]) {
int N = atoi(argv[1]);
int which = atoi(argv[2]);
const char* name = "unknown";
uint64_t start = GetTimeStampInUs();
if (which == 0) {
name = "gettimeofday";
struct timeval tv;
for (int i = 0; i < N; ++i) {
gettimeofday(&tv, NULL);
}
} else if (which ==1) {
name = "time";
for (int i = 0; i < N; ++i) {
time(NULL);
}
} else if (which == 2) {
name = "clock_gettime";
for (int i = 0; i < N; ++i) {
// struct timespec ts;
//clock_gettime(CLOCK_REALTIME, &ts);
}
} else {
name = "getppid";
for (int i = 0; i < N; ++i) {
getppid();
}
}
uint64_t end = GetTimeStampInUs();
//std::cout << (end-start) / 1000000 << " seconds \n";
std::cout << "name=" << name <<"\n\t";
std::cout << (end-start) << " us \n";
}