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#include <stdio.h>
#include <stdlib.h>
#include <sys/time.h>
#include <sys/types.h>
#include <unistd.h>
#include <fcntl.h>
int test_posix(int block_size, int blocks, int gap, int rdisk, int nocache)
{
struct timeval start;
gettimeofday(&start, NULL);
int f = -1;
if (rdisk) {
f = open("/dev/rdisk3", O_RDWR);
} else {
f = open("/dev/disk3", O_RDWR);
}
if (f == -1) {
printf("open failed.\n");
return -1;
}
fcntl(f, F_NOCACHE, nocache);
void* buffer = malloc(block_size);
if (!buffer) {
printf("malloc failed.\n");
return -1;
}
for (int i = 0; i < blocks; ++i) {
write(f, buffer, block_size);
if (gap > 0) {
lseek(f, gap, SEEK_CUR);
}
}
close(f);
struct timeval end;
gettimeofday(&end, NULL);
float duration = ((end.tv_sec + end.tv_usec / 1e6) - (start.tv_sec + start.tv_usec / 1e6));
printf("POSIX: block_size=%d blocks=%d gap=%d rdisk=%d nocache=%d time=%f\n", block_size, blocks, gap, rdisk, nocache, duration);
return 0;
}
int test_stdio(int block_size, int blocks, int gap, int rdisk)
{
struct timeval start;
gettimeofday(&start, NULL);
FILE* f = NULL;
if (rdisk) {
f = fopen("/dev/rdisk3", "r+b");
} else {
f = fopen("/dev/disk3", "r+b");
}
if (!f) {
printf("fopen failed.\n");
return -1;
}
setbuf(f, 0);
void* buffer = malloc(block_size);
if (!buffer) {
printf("malloc failed.\n");
return -1;
}
for (int i = 0; i < blocks; ++i) {
fwrite(buffer, block_size, 1, f);
if (gap > 0) {
fseek(f, gap, SEEK_CUR);
}
}
fclose(f);
struct timeval end;
gettimeofday(&end, NULL);
float duration = ((end.tv_sec + end.tv_usec / 1e6) - (start.tv_sec + start.tv_usec / 1e6));
printf("STDIO: block_size=%d blocks=%d gap=%d rdisk=%d time=%f\n", block_size, blocks, gap, rdisk, duration);
return 0;
}
int main()
{
for (int i = 0; i < 2; i++) {
/*
test_posix(4096, 4096, 0, i);
test_posix(4096, 4096, 0, i);
test_posix(8192, 2048, 0, i);
test_posix(4096, 4096, 4096, i);
test_posix(4096, 4096, 65536, i);
test_posix(8192, 2048, 65536, i);
test_posix(16384, 1024, 65536, i);
*/
for (int j = 0; j < 2; j++) {
// test_posix(4096, 262144, 0, i, j);
// test_posix(8192, 131072, 0, i, j);
// test_posix(16384, 65536, 0, i, j);
test_posix(32768, 32768, 0, i, j);
test_posix(65536, 16384, 0, i, j);
test_posix(131072, 8192, 0, i, j);
test_posix(262144, 4096, 0, i, j);
test_posix(524288, 2048, 0, i, j);
}
}
}
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