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TIming test
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> ./a.out | |
done | |
direct: 239.264000ms | |
alts: 509.709000ms | |
overhead: 113.03% | |
> ./a.out | |
done | |
direct: 258.248000ms | |
alts: 511.959000ms | |
overhead: 98.24% | |
> ./a.out | |
done | |
direct: 252.697000ms | |
alts: 510.250000ms | |
overhead: 101.92% | |
> ./a.out | |
done | |
direct: 244.227000ms | |
alts: 513.805000ms | |
overhead: 110.38% |
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#include <sys/time.h> | |
#include <sys/types.h> | |
#include <sys/wait.h> | |
#include <stdio.h> | |
#include <unistd.h> | |
/* | |
assumptions: | |
> cat /usr/share/libalternatives/libalternatives-unit-test-helper/10.conf | |
binary=/usr/bin/true | |
man=true.1 | |
> ln -s /usr/bin/alts libalternatives-unit-test-helper | |
*/ | |
char *a[] = { "/usr/bin/true", 0 }; | |
char *b[] = { "./libalternatives-unit-test-helper", 0 }; | |
int main() | |
{ | |
struct timeval t1, t2, t3; | |
int s; | |
// warm up | |
for (int i=0; i<1000; i++){ | |
int pid = fork(); | |
if (pid == 0) | |
execv(a[0], a); | |
if (wait(&s) == -1 || s != 0) { | |
printf("something went wrong\n"); | |
return 0; | |
} | |
} | |
// measure | |
gettimeofday(&t1, NULL); | |
for (int i=0; i<1000; i++){ | |
int pid = fork(); | |
if (pid == 0) | |
execv(a[0], a); | |
if (wait(&s) == -1 || s != 0) { | |
printf("something went wrong\n"); | |
return 0; | |
} | |
} | |
gettimeofday(&t2, NULL); | |
for (int i=0; i<1000; i++){ | |
int pid = fork(); | |
if (pid == 0) | |
execv(b[0], b); | |
if (wait(&s) == -1 || s != 0) { | |
printf("something went wrong\n"); | |
return 0; | |
} | |
} | |
gettimeofday(&t3, NULL); | |
printf("done\n"); | |
double direct = ((double)t2.tv_sec - t1.tv_sec)*1e3 + ((double)t2.tv_usec - t1.tv_usec)/1e3; | |
double alts = ((double)t3.tv_sec - t2.tv_sec)*1e3 + ((double)t3.tv_usec - t2.tv_usec)/1e3; | |
printf("direct: %fms\n", direct); | |
printf("alts: %fms\n", alts); | |
printf("overhead: %.2f%%\n", (alts - direct)*100.0/direct); | |
return 0; | |
} |
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