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t.c
jmg (John-Mark Gurney)
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jmg
Mar 2 2021, 12:08 AM
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1 KB
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t.c
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#include <sys/param.h>
#include <sys/time.h>
#include <stdio.h>
#include <stdlib.h>
#include <time.h>
int sizes[] = {
1,
10,
25,
50,
100,
1000,
10000,
#if 0
100000,
1000000,
#endif
};
void
verify(void)
{
int nums[] = {
/* jot -r 20 1 999999999 1 | awk '{ print $1 "," }' */
6513444,
762838363,
39044811,
67968908,
292366025,
362679942,
635992995,
999568586,
516833232,
566881329,
910796821,
211509993,
180633301,
974333865,
849253613,
274059751,
208859719,
868674398,
713667332,
139342112,
};
char *start, *ptr;
int i, r, val;
start = ptr = malloc(nitems(nums) * 10 + 1);
for (i = 0; i < nitems(nums); i++) {
r = sprintf(ptr, "%d", nums[i]);
ptr += r;
*ptr++ = ' ';
}
*ptr++ = '\x00';
printf("verifying: %s\n", start);
ptr = start;
for (i = 0; i < nitems(nums); i++) {
sscanf(ptr, "%d%n", &val, &r);
ptr += r;
if (val != nums[i]) {
printf("error! %d != %d\n", val, nums[i]);
exit(1);
break;
}
}
}
volatile int bin;
char *
makelong(int l)
{
int i;
char *ret, *pos;
ret = malloc(l * 2 + 1);
pos = ret;
for (i = 0; i < l; i++) {
*pos++ = '0';
*pos++ = ' ';
}
*pos++ = '\x00';
return ret;
}
void
parsestr(char *r)
{
int cnt;
int nchars;
int val;
cnt = 0;
while (*r) {
sscanf(r, "%d%n", &val, &nchars);
bin = val;
r += nchars;
cnt++;
#if 0
if ((cnt % 10000) == 0)
printf("cnt: %d\n", cnt);
#endif
}
}
void
runsize(int cnt)
{
struct timespec ts, te, res;
char *nums;
int i;
nums = makelong(cnt);
printf("made %d\n", cnt);
clock_gettime(CLOCK_MONOTONIC, &ts);
for (i = 0; i < 500; i++)
parsestr(nums);
clock_gettime(CLOCK_MONOTONIC, &te);
timespecsub(&te, &ts, &res);
printf("time: %ld.%09ld\n", res.tv_sec, res.tv_nsec);
}
int
main(int argc, char *argv[])
{
int i;
if (argc == 2) {
runsize(atoi(argv[1]));
return 0;
}
verify();
for (i = 0; i < nitems(sizes); i++)
runsize(sizes[i]);
}

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t.c (1 KB)

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