1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
| #include <bits/stdc++.h>
#include <unistd.h>
#include <sys/resource.h>
#include <sys/time.h>
#define DBG(x) cerr << #x << " = " << x << endl
using namespace std;
typedef long long LL;
double cpu_load(double start, double end, double used) {
return used / (end - start) * 100;
}
double cpu_time_used_s() {
rusage usage;
getrusage(RUSAGE_SELF, &usage);
return usage.ru_stime.tv_sec + double(usage.ru_stime.tv_usec) / 1000000 + usage.ru_utime.tv_sec + double(usage.ru_utime.tv_usec) / 1000000;
}
double get_time_s() {
timeval tv;
gettimeofday(&tv, NULL);
return tv.tv_sec + double(tv.tv_usec) / 1000000;
}
int main(int argc, char **argv) {
double start = get_time_s();
srand(time(NULL));
int x = rand();
for (int i = 0; i < 300000000; i++) {
x ^= rand();
x |= rand();
x &= ~rand();
}
sleep(5);
double end = get_time_s();
double real_time_used = end - start;
double cpu_time_used = cpu_time_used_s();
printf("start: %.3fs, end: %.3fs\n"
"real_time_used: %.3f\n"
"cpu_time_used: %.3fs, cpu_load: %.3f%%\n",
start, end, real_time_used, cpu_time_used, cpu_load(start, end, cpu_time_used));
return 0;
}
|