Ajay Mohan / Rasperf

Authored by Aravind Kumar 9 years ago

Exists in master

Showing 1 changed file with 6 additions and 6 deletions Side-by-side Diff

1	1	#include <stdio.h>
2	2	#include <stdlib.h>
	3	+
3	4	int main(int argc, char **argv)
4	5	{
5		- int count, i, toSlave[2], fromSlave[2];
	6	+ int count, i, tochild[2], fromchild[2];
6	7	int pid, status;
7	8	char buffer[10];
8	9	unsigned int begin ,end;
9	10
...	...	@@ -12,12 +13,12 @@
12	13	printf("regr: %x\n", regr);
13	14
14	15	count = 1000;
15		- pipe(toSlave);
	16	+ pipe(tochild);
16	17	for (i = 0; i < count; i++)
17	18	{
18	19	pid = fork();
19	20	if (pid == 0) {
20		- read(toSlave[0], buffer, 1);
	21	+ read(tochild[0], buffer, 1);
21	22	//if (buffer[0] != 'a') {
22	23	// printf("Exiting\n");
23	24	// return -1;
24	25
...	...	@@ -28,8 +29,8 @@
28	29	printf("Couldn't fork slave process: error %d.\n");
29	30	return -1;
30	31	} else {
	32	+ write(tochild[1], "a", 1);
31	33	asm volatile("mrc p15, 0, %0, c9, c13, 0" : "=r" (begin));
32		- write(toSlave[1], "a", 1);
33	34	waitpid(pid, &status, 0);
34	35	asm volatile("mrc p15, 0, %0, c9, c13, 0" : "=r" (end));
35	36	//usleep(10000);
...	...	@@ -39,7 +40,6 @@
39	40
40	41	}
41	42	timePer = timePer/(2900count);
42		- printf("Average time taken for context switch: %.lf seconds.\n",
43		- timePer);
	43	+ printf("Average time for context switch: %.lf seconds.\n", timePer);
44	44	}