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#define _GNU_SOURCE
#include <string.h>
#include <sys/types.h>
#include <sys/mman.h>
#include <unistd.h>
#include <stdlib.h>
#include <stdio.h>
#include <fcntl.h>
#include <time.h>
#include <stdint.h>
void pipe_rw_test() {
int fd[2];
pipe(fd);
printf("OS pipe test\n");
char buffer[5];
for(int i = 0;i < 5;i++) {
struct timespec start;
struct timespec end;
clock_gettime(CLOCK_MONOTONIC,&start);
write(fd[1],"test\n",4);
read(fd[0],buffer,5);
clock_gettime(CLOCK_MONOTONIC,&end);
printf("OS pipe test %d - %llu ns\n",i,end.tv_nsec - start.tv_nsec);
}
}
void rw_test() {
printf("OS r/w test\n");
int fd = open("/tmp/testfd",O_RDWR | O_CREAT | O_TRUNC);
char buffer[5];
for(int i = 0;i < 5;i++) {
struct timespec start;
struct timespec end;
clock_gettime(CLOCK_MONOTONIC,&start);
write(fd,"test\n",4);
lseek(fd,0,SEEK_SET);
read(fd,buffer,5);
lseek(fd,0,SEEK_SET);
clock_gettime(CLOCK_MONOTONIC,&end);
printf("OS pipe test %d - %llu ns\n",i,end.tv_nsec - start.tv_nsec);
}
}
void open_test() {
printf("OS open test\n");
for(int i = 0;i < 5;i++) {
struct timespec start;
struct timespec end;
clock_gettime(CLOCK_MONOTONIC,&start);
int fd = open("/tmp/testfd",O_RDWR | O_CREAT | O_TRUNC);
close(fd);
clock_gettime(CLOCK_MONOTONIC,&end);
printf("OS pipe test %d - %llu ns\n",i,end.tv_nsec - start.tv_nsec);
}
}
void mmap_test() {
printf("OS mmap test\n");
for(int i = 0;i < 5;i++) {
struct timespec start;
struct timespec end;
clock_gettime(CLOCK_MONOTONIC,&start);
void* addr = mmap(NULL, 0x80000, PROT_WRITE | PROT_READ, MAP_ANONYMOUS | MAP_PRIVATE, -1, 0);
if (addr == MAP_FAILED) {
perror("mmap failed");
continue;
}memset(addr,1,0x80000);
clock_gettime(CLOCK_MONOTONIC,&end);
printf("OS mmap test %d - %llu ns\n",i,end.tv_nsec - start.tv_nsec);
}
}
typedef unsigned long long op_t;
#define OPSIZ 8
#define byte char
void * __attribute__ ((__optimize__ ("-fno-tree-loop-distribute-patterns"))) t_memset (void *dstpp, int c, size_t len)
{
long int dstp = (long int) dstpp;
if (len >= 8)
{
size_t xlen;
op_t cccc;
cccc = (unsigned char) c;
cccc |= cccc << 8;
cccc |= cccc << 16;
if (OPSIZ > 4)
/* Do the shift in two steps to avoid warning if long has 32 bits. */
cccc |= (cccc << 16) << 16;
/* There are at least some bytes to set.
No need to test for LEN == 0 in this alignment loop. */
while (dstp % OPSIZ != 0)
{
((byte *) dstp)[0] = c;
dstp += 1;
len -= 1;
}
/* Write 8 `op_t' per iteration until less than 8 `op_t' remain. */
xlen = len / (OPSIZ * 8);
while (xlen > 0)
{
((op_t *) dstp)[0] = cccc;
((op_t *) dstp)[1] = cccc;
((op_t *) dstp)[2] = cccc;
((op_t *) dstp)[3] = cccc;
((op_t *) dstp)[4] = cccc;
((op_t *) dstp)[5] = cccc;
((op_t *) dstp)[6] = cccc;
((op_t *) dstp)[7] = cccc;
dstp += 8 * OPSIZ;
xlen -= 1;
}
len %= OPSIZ * 8;
/* Write 1 `op_t' per iteration until less than OPSIZ bytes remain. */
xlen = len / OPSIZ;
while (xlen > 0)
{
((op_t *) dstp)[0] = cccc;
dstp += OPSIZ;
xlen -= 1;
}
len %= OPSIZ;
}
/* Write the last few bytes. */
while (len > 0)
{
((byte *) dstp)[0] = c;
dstp += 1;
len -= 1;
}
return dstpp;
}
int memset_test() {
for(int i = 0; i < 16;i++) {
struct timespec start;
struct timespec end;
clock_gettime(CLOCK_MONOTONIC,&start);
char buf[1024*1024];
memset(buf,1,1024*1024);
clock_gettime(CLOCK_MONOTONIC,&end);
printf("memset test %d - %llu ns\n",i,end.tv_nsec - start.tv_nsec);
}
for(int i = 0; i < 16;i++) {
struct timespec start;
struct timespec end;
clock_gettime(CLOCK_MONOTONIC,&start);
char buf[1024*1024];
t_memset(buf,0,1024*1024);
clock_gettime(CLOCK_MONOTONIC,&end);
printf("opt memset test %d - %llu ns\n",i,end.tv_nsec - start.tv_nsec);
}
}
int main() {
pipe_rw_test();
rw_test();
open_test();
mmap_test();
memset_test();
}
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