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
|
#include <camellia/syscalls.h>
#include <errno.h>
#include <stdio.h>
#include <string.h>
#include <x86intrin.h>
int main(int argc, char **argv) {
long num_runs = 4;
long num_calls = 512;
long num_bytes = 1;
uint64_t *results;
char *inbuf;
if (argc > 1) num_runs = strtol(argv[1], NULL, 0);
if (argc > 2) num_calls = strtol(argv[2], NULL, 0);
if (argc > 3) num_bytes = strtol(argv[3], NULL, 0);
if (argc > 4 || num_runs == 0 || num_calls == 0) {
fprintf(stderr, "usage: %s [num_runs] [num_calls] [num_bytes]\n", argv[0]);
return 1;
}
results = malloc(sizeof(*results) * num_runs);
inbuf = malloc(num_bytes);
memset(inbuf, '.', num_bytes);
for (long i = 0; i < num_runs; i++) {
uint64_t time = __rdtsc();
for (long j = 0; j < num_calls; j++)
_sys_write(1, inbuf, num_bytes, -1, 0);
results[i] = __rdtsc() - time;
_sys_write(1, "\n", 1, -1, 0);
}
uint64_t total = 0;
for (long i = 0; i < num_runs; i++) {
uint64_t scaled = results[i] / 3000;
total += scaled;
fprintf(stderr, "run %ld: %lu\n", i, scaled);
}
fprintf(stderr, "%lu calls, %lu bytes. avg %lu\n", num_calls, num_bytes, total / num_runs);
return 0;
}
|
