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sequentialread.c
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sequentialread.c
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#define _GNU_SOURCE
#define _FILE_OFFSET_BITS 64
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <errno.h>
#include <unistd.h>
#include <assert.h>
#include <pthread.h>
#include "util.h"
typedef struct {
int fd;
char *buf;
double stime, ftime;
long ops;
cpu_set_t cpuset;
} seqread_t;
struct {
int cpu_cores;
int openflg;
int nthread;
long iosize, maxiter, fsize;
double timeout;
char *filepath;
} option;
void
printusage(const char *cmd)
{
fprintf(stderr,
"Usage : %s [-d] [-s iosize] [-i maxiter] [-t timeout] "
"[-m nthread ] [-S fsize] filepath\n",
cmd);
}
void
parsearg(int argc, char **argv)
{
int opt;
option.cpu_cores = sysconf(_SC_NPROCESSORS_ONLN);
option.openflg = O_RDONLY;
option.nthread = 1;
option.iosize = BLOCK_SIZE;
option.maxiter = 4096;
option.timeout = 60 * 60;
option.fsize = -1;
while ((opt = getopt(argc, argv, "ds:i:t:m:S:")) != -1) {
switch (opt) {
case 'd':
option.openflg |= O_DIRECT;
break;
case 's':
option.iosize = procsuffix(optarg);
break;
case 'i':
option.maxiter = atol(optarg);
break;
case 't':
option.timeout = atof(optarg);
break;
case 'm':
option.nthread = atoi(optarg);
break;
case 'S':
option.fsize = procsuffix(optarg);
break;
default:
printusage(argv[0]);
exit(EXIT_FAILURE);
}
}
if (argc - 1 == optind) {
option.filepath = argv[optind];
}
else {
printusage(argv[0]);
exit(EXIT_FAILURE);
}
// check file size
{
int fd;
if ((fd = open(option.filepath, O_RDONLY)) < 0) {
perror("open");
exit(EXIT_FAILURE);
}
if ((option.fsize = lseek(fd, 0, SEEK_END)) < 0) {
perror("lseek");
exit(EXIT_FAILURE);
}
close(fd);
}
fprintf(stderr, "Sequential read I/O microbenchmark\n");
// print options
printf("io_size\t%ld\n"
//"iteration\t%ld\n"
"num_thread\t%d\n"
"file_path\t%s\n"
"enable_odirect\t%s\n"
"target_size\t%ld\n",
option.iosize,
//option.maxiter,
option.nthread,
option.filepath,
(option.openflg & O_DIRECT) ? "TRUE" : "FALSE",
option.fsize);
assert(option.iosize % BLOCK_SIZE == 0);
assert(option.fsize >= (option.iosize * option.maxiter * option.nthread));
}
void
sequential_read(seqread_t *readinfo)
{
int i;
struct timespec stime, ftime;
//set affinity
if (pthread_setaffinity_np(pthread_self(), sizeof(cpu_set_t), &readinfo->cpuset) != 0) {
perror("pthread_setaffinity_np()");
exit(EXIT_FAILURE);
}
CLOCK_GETTIME(&stime);
do {
for (i = 0; i < 1024; i++) {
read(readinfo->fd, readinfo->buf, option.iosize);
}
readinfo->ops += 1024;
CLOCK_GETTIME(&ftime);
} while ((TIMEINTERVAL_SEC(stime, ftime) < option.timeout) &&
(readinfo->ops < option.maxiter));
readinfo->stime = TS2SEC(stime);
readinfo->ftime = TS2SEC(ftime);
}
int
main(int argc, char **argv)
{
int i;
pthread_t *pt;
seqread_t *readinfos;
parsearg(argc, argv);
// allocate memory for pthread_t
if (posix_memalign((void **) &pt,
BLOCK_SIZE,
sizeof(pthread_t) * option.nthread) != 0) {
perror("posix_memalign");
exit(EXIT_FAILURE);
}
// allocate memory for readinfo
if (posix_memalign((void **) &readinfos,
BLOCK_SIZE,
sizeof(seqread_t) * option.nthread) != 0) {
perror("posix_memalign");
exit(EXIT_FAILURE);
}
// set readinfo
for (i = 0; i < option.nthread; i++) {
int j;
// allocate buffer aligned by BLOCK_SIZE
if (posix_memalign((void **) &readinfos[i].buf, BLOCK_SIZE, option.iosize) != 0) {
perror("posix_memalign");
exit(EXIT_FAILURE);
}
// open file
if ((readinfos[i].fd = open(option.filepath, option.openflg)) < 0) {
perror("open");
exit(EXIT_FAILURE);
}
// seek to assigned place
if (lseek(readinfos[i].fd, i * option.iosize * option.maxiter, SEEK_SET) < 0) {
perror("lseek");
exit(EXIT_FAILURE);
}
// set cpuset
CPU_ZERO(&readinfos[i].cpuset);
for (j = 0; j < option.cpu_cores; j++) { CPU_SET(j, &readinfos[i].cpuset); }
readinfos[i].ops = 0;
}
// sequential read
for (i = 0; i < option.nthread; i++) {
pthread_create(&pt[i], NULL,
(void *(*)(void *))sequential_read, (void *)(readinfos+ i));
}
for (i = 0; i < option.nthread; i++) {
pthread_join(pt[i], NULL);
}
// print statistics information
{
double stime, ftime;
long ops = 0;
double exectime, mbps, iops, latency = 0.0;
stime = readinfos[0].stime;
ftime = readinfos[0].ftime;
for (i = 1; i < option.nthread; i++) {
if (stime > readinfos[i].stime) { stime = readinfos[i].stime; }
if (ftime < readinfos[i].ftime) { ftime = readinfos[i].ftime; }
}
exectime = ftime - stime;
for (i = 0; i < option.nthread; i++) { ops += readinfos[i].ops; }
iops = ops / exectime;
mbps = (option.iosize * ops) / exectime / 1000000;
for (i = 0; i < option.nthread; i++){
latency += (readinfos[i].ftime - readinfos[i].stime);
}
latency /= ops;
printf("start_time\t%.9f\n"
"finish_time\t%.9f\n",
stime, ftime);
printf("exec_time_sec\t%.9f\n"
"total_ops\t%ld\n"
"mb_per_sec\t%f\n"
"io_per_sec\t%f\n"
"usec_per_io\t%f\n",
exectime, ops, mbps, iops, latency * 1000000);
}
for (i = 0; i < option.nthread; i++){
close(readinfos[i].fd);
free(readinfos[i].buf);
}
free(readinfos);
free(pt);
return 0;
}