Commit 951d6ba82ccb8199ce958cc857ff9f4753c808d7
1 parent
5d73e140ef
Exists in
master
GettimeofDay overhead
Showing 2 changed files with 21 additions and 0 deletions Side-by-side Diff
cpu/gettimeofday_overhead.c
View file @
951d6ba
| 1 | +#include <stdio.h> | |
| 2 | +#include <sys/time.h> | |
| 3 | + | |
| 4 | +int main() | |
| 5 | +{ | |
| 6 | + int time1, time2, sum=0; | |
| 7 | + int i; | |
| 8 | + float avg = 0.0; | |
| 9 | + asm volatile("mrc p15, 0, %0, c9, c14, 0" : "=r" (i)); | |
| 10 | + printf("Get Time of Day overhead: \n"); | |
| 11 | + struct timeval tv; | |
| 12 | + | |
| 13 | + while(sum < 100) { | |
| 14 | + asm volatile("mrc p15, 0, %0, c9, c13, 0" : "=r" (time1)); | |
| 15 | + gettimeofday(&tv, NULL); | |
| 16 | + asm volatile("mrc p15, 0, %0, c9, c13, 0" : "=r" (time2)); | |
| 17 | + avg = (time2 - time1); | |
| 18 | + sum++; | |
| 19 | + } | |
| 20 | + printf("%f", avg); | |
| 21 | +} |
cpu/gettimeofday_overhead.o
View file @
951d6ba