Re:Ask HN: What is your go to performance optimization?
by signa11 on Thursday July 25, 2024 @09:21AM
(#41068372)
umm this is kinda tongue-in-cheek
```
#include <time.h>
#include <stdio.h>
int main(int argc, char argv[])
{
int i = 0;
time_t timep;
/*
* ok so now we are printing something
**/
printf("Greetings!\n");
/*
* this is a for loop from 0..9
**/
for(i=0; i<10; i++) {
time(&timep);
localtime(&timep);
}
printf("Godspeed, dear friend!\n");
return 0;
```
#include <time.h>
#include <stdio.h>
int main(int argc, char argv[]) { int i = 0; time_t timep;
}```
now, the canonical
```
$> gcc tz-test.c -o obj/tz-test
```
now do this
```
$> unset TZ
$> strace -ff ./obj/tz-test 2>&1 | grep 'local' | wc
$> export TZ=:/etc/localtime$> strace -ff ./obj/tz-test 2>&1 | grep 'local' | wc
```moral, always set TZ to avoid localtime(3) from stat'ing /etc/localtime :o)