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disktest.c
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disktest.c
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/*
* disktest - a quick and dirty multithreaded read/write seek test
*
* Author: Steve Jiang (@sjiang) email: gh at iamsteve.com
*
*/
#include <stdio.h>
#include <sys/types.h>
#include <unistd.h>
#include <sys/stat.h>
#include <stdlib.h>
#include <fcntl.h>
#include <time.h>
#include <string.h>
#include <errno.h>
#include <limits.h>
#include <pthread.h>
#include <sys/ioctl.h>
#include <sys/time.h>
#include <sys/mount.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <unistd.h>
#define DEBUG(msg, args...) do {if (g_debug) fprintf(stderr, "[%s] " msg "\n", __FUNCTION__ , ##args );} while (0)
#define LOG(msg, args...) do { printf("[%s] " msg "\n", __FUNCTION__ , ##args ); } while (0)
#define ERROR(msg, args...) do {fprintf(stderr, "[%s] " msg "\n", __FUNCTION__ , ##args );} while (0)
#ifndef ULLONG_MAX
#define ULLONG_MAX (18446744073709551615ULL)
#endif
static int g_debug;
typedef struct testconf_ {
int die_read;
int die_write;
int direct;
off_t block_size;
off_t byte_offset;
size_t size;
int read_threads;
int write_threads;
unsigned long long time_deadline;
unsigned long total_reads;
unsigned long reads_remaining;
unsigned long total_writes;
unsigned long writes_remaining;
off_t seek_limit_blocks;
char* write_buffer;
} test_config;
typedef struct wctx_ {
int fd;
unsigned long *results;
unsigned long results_size;
unsigned long ops_done;
off_t min_seek_byte;
off_t max_seek_byte;
unsigned long long start;
unsigned long long end;
} test_context;
test_config* gconf = NULL;
void usage()
{
fprintf(stderr, "usage: disktest [options] [-rwRWt] <device or file>\n"
"\t-b [bytes] block size (default 4K)\n"
"\t-o [bytes] offset into block (default 0)\n"
"\t-s [bytes] size to read/write (default 4K)\n"
"\t-r [threads] num read threads\n"
"\t-w [threads] num write threads\n"
"\t-R [count] total number of reads to do (across all threads)\n"
"\t-W [count] total number of writes to do (across all threads)\n"
"\t-t [seconds] time to run\n"
"\t-S [bytes] seek range limit (default is the size of the file/device)\n"
"\t-d debug on\n"
"\t-D use O_DIRECT (bypass page cache)\n"
"\t-h print this help\n");
}
unsigned long long timeval_to_usec(struct timeval* val) {
unsigned long long ret = val->tv_usec;
ret += (unsigned long long)val->tv_sec * 1000000ULL;
return ret;
}
void reset_conf(test_config* conf) {
conf->die_read = 0;
conf->die_write = 0;
conf->direct = 0;
conf->block_size = 4096;
conf->byte_offset = 0;
conf->size = 4096;
conf->read_threads = 0;
conf->write_threads = 0;
conf->time_deadline = ULLONG_MAX;
conf->total_reads = 0;
conf->reads_remaining = 0;
conf->total_writes = 0;
conf->writes_remaining = 0;
conf->write_buffer = NULL;
}
void reset_context(test_context* tc) {
tc->ops_done = 0;
tc->results_size = 1000;
tc->results = (unsigned long*)malloc(sizeof(unsigned long) * tc->results_size);
tc->max_seek_byte = 0;
tc->min_seek_byte = LLONG_MAX;
tc->start = 0;
tc->end = 0;
tc->fd = -1;
}
void* alloc_aligned(size_t size) {
int rc;
void* aligned = NULL;
size_t aligned_size = sizeof(void*);
while (aligned_size < size) {
aligned_size = aligned_size << 1;
if (aligned_size & (1UL << (8*sizeof(size_t)-2))) {
ERROR("memalign size too large");
return NULL;
}
}
if((rc = posix_memalign(&aligned, sysconf(_SC_PAGESIZE), aligned_size)) != 0
|| !aligned) {
ERROR("Failed to allocate aligned buffer: %d", rc);
return NULL;
}
return aligned;
}
void add_result(test_context* tc, unsigned long idx, unsigned long value) {
while (idx >= tc->results_size) {
tc->results_size *= 2;
tc->results = (unsigned long*)realloc(tc->results, sizeof(unsigned long)*tc->results_size);
}
tc->results[idx] = value;
}
void* read_worker(void* data) {
struct timeval tv;
off_t block, start;
unsigned long long remaining;
unsigned long long op_time;
test_context *tc = (test_context*)data;
char* read_buf = NULL;
char strerrbuf[256];
memset(strerrbuf, 0, sizeof(strerrbuf));
read_buf = (char*)alloc_aligned(gconf->size);
if (!read_buf) {
return NULL;
}
gettimeofday(&tv, NULL);
tc->start = timeval_to_usec(&tv);
while(1) {
if (gconf->die_read) {
break;
}
remaining = __sync_sub_and_fetch(&gconf->reads_remaining, 1);
if (!remaining) {
gconf->die_read = 1;
}
gettimeofday(&tv, NULL);
op_time = timeval_to_usec(&tv);
if (op_time >= gconf->time_deadline) break;
block = (off_t)(labs(random())) % (off_t)(gconf->seek_limit_blocks+1);
start = block * gconf->block_size + gconf->byte_offset;
if (tc->min_seek_byte > start) tc->min_seek_byte = start;
if (tc->max_seek_byte < start) tc->max_seek_byte = start;
if (lseek(tc->fd, start, SEEK_SET) < 0) {
strerror_r(errno, strerrbuf, sizeof(strerrbuf));
ERROR("Failed to seek to %lld: %s (%d)", (long long)start, strerrbuf, errno);
break;
}
if (read(tc->fd, read_buf, gconf->size) < 0) {
strerror_r(errno, strerrbuf, sizeof(strerrbuf));
ERROR("Failed to read %lu bytes at %lld: %s (%d)", gconf->size, (long long)start, strerrbuf, errno);
break;
}
gettimeofday(&tv, NULL);
op_time = (timeval_to_usec(&tv) - op_time);
add_result(tc, tc->ops_done, (unsigned long)op_time);
tc->ops_done++;
}
if (read_buf) free(read_buf);
gettimeofday(&tv, NULL);
tc->end = timeval_to_usec(&tv);
return NULL;
}
void* write_worker(void* data) {
struct timeval tv;
off_t block, start;
unsigned long long remaining;
unsigned long long op_time;
test_context *tc = (test_context*)data;
char strerrbuf[256];
memset(strerrbuf, 0, sizeof(strerrbuf));
gettimeofday(&tv, NULL);
tc->start = timeval_to_usec(&tv);
while(1) {
if (gconf->die_write) {
break;
}
remaining = __sync_sub_and_fetch(&gconf->writes_remaining, 1);
if (!remaining) {
gconf->die_write = 1;
}
gettimeofday(&tv, NULL);
op_time = timeval_to_usec(&tv);
if (op_time >= gconf->time_deadline) break;
block = (off_t)(labs(random())) % (off_t)(gconf->seek_limit_blocks+1);
start = block * gconf->block_size + gconf->byte_offset;
if (tc->min_seek_byte > start) tc->min_seek_byte = start;
if (tc->max_seek_byte < start) tc->max_seek_byte = start;
if (lseek(tc->fd, start, SEEK_SET) < 0) {
strerror_r(errno, strerrbuf, sizeof(strerrbuf));
ERROR("Failed to seek to %lld: %s (%d)", (long long)start, strerrbuf, errno);
break;
}
if (write(tc->fd, gconf->write_buffer, gconf->size) < 0) {
strerror_r(errno, strerrbuf, sizeof(strerrbuf));
ERROR("Failed to write %lu bytes at %lld: %s (%d)", gconf->size, (long long)start, strerrbuf, errno);
break;
}
gettimeofday(&tv, NULL);
op_time = (timeval_to_usec(&tv) - op_time);
add_result(tc, tc->ops_done, (unsigned long)op_time);
tc->ops_done++;
}
gettimeofday(&tv, NULL);
tc->end = timeval_to_usec(&tv);
return NULL;
}
void printconf() {
LOG("Block size: %lld", (long long) gconf->block_size);
LOG("Byte offset: %lld", (long long) gconf->byte_offset);
LOG("Size per operation: %lu", (unsigned long) gconf->size);
LOG("Read threads: %d", gconf->read_threads);
LOG("Write threads: %d", gconf->write_threads);
LOG("Seek range is 0 to %llu bytes", (unsigned long long) gconf->seek_limit_blocks * gconf->block_size);
if (gconf->direct) {
LOG("Using O_DIRECT");
}
}
int cmpul(const void* l1, const void* l2) {
if (*((const unsigned long*)l1) < *((const unsigned long*)l2))
return -1;
if (*((const unsigned long*)l1) > *((const unsigned long*)l2))
return 1;
return 0;
}
void printresults(const char* pool_name, test_context* c, int size) {
unsigned int i;
unsigned long long start_min = ULLONG_MAX, end_max = 0, total_ops = 0;
off_t seek_min = LLONG_MAX, seek_max = 0;
double total_elapsed = 0;
unsigned long *all_results, *pos;
if (size) {
for (i = 0; i < size; ++i) {
DEBUG("----------------------");
DEBUG("%s thread %d", pool_name, i);
DEBUG("----------------------");
DEBUG("operations completed: %lu", c[i].ops_done);
DEBUG("start: %llu", c[i].start);
if (c[i].start < start_min) start_min = c[i].start;
DEBUG("end: %llu", c[i].end);
if (c[i].end > end_max) end_max = c[i].end;
DEBUG("elapsed seconds: %f", ((double)(c[i].end - c[i].start))/1000000.0);
total_ops += c[i].ops_done;
DEBUG("min seek byte: %lld",(long long)c[i].min_seek_byte);
DEBUG("max seek byte: %lld",(long long)c[i].max_seek_byte);
if (c[i].min_seek_byte < seek_min) seek_min = c[i].min_seek_byte;
if (c[i].max_seek_byte > seek_max) seek_max = c[i].max_seek_byte;
}
LOG("----------------------");
LOG("total %s ops: %llu", pool_name, total_ops);
if (total_ops) {
// collect all the elapsed
pos = all_results = (unsigned long*)malloc(total_ops * sizeof(unsigned long));
for (i = 0; i < size; ++i) {
memcpy(pos, c[i].results, c[i].ops_done*sizeof(unsigned long));
pos += c[i].ops_done;
}
qsort(all_results, total_ops, sizeof(unsigned long), &cmpul);
for (i = 0; i < total_ops; ++i) {
total_elapsed += all_results[i];
}
LOG( "10%% %s usec: %lu", pool_name, all_results[(total_ops / 10ULL)] );
LOG( "25%% %s usec: %lu", pool_name, all_results[(total_ops / 4ULL)] );
LOG( "50%% %s usec: %lu", pool_name, all_results[(total_ops / 2ULL)] );
LOG( "75%% %s usec: %lu", pool_name, all_results[(total_ops*3ULL / 4ULL)] );
LOG( "90%% %s usec: %lu", pool_name, all_results[(total_ops*9ULL / 10ULL)] );
LOG( "99%% %s usec: %lu", pool_name, all_results[(total_ops*99ULL / 100ULL)] );
LOG( "99.9%% %s usec: %lu", pool_name, all_results[(total_ops*999ULL / 1000ULL)] );
LOG("min %s usec: %lu", pool_name, all_results[0]);
LOG("max %s usec: %lu", pool_name, all_results[total_ops-1]);
free(all_results);
}
LOG("elapsed seconds: %f",((double)(end_max - start_min))/1000000.0);
LOG("%s ops per second: %f", pool_name, ((double)total_ops)/ (((double)(end_max - start_min))/1000000.0));
DEBUG("min seek byte: %lld",(long long)seek_min);
DEBUG("max seek byte: %lld",(long long)seek_max);
}
}
int main(int argc, char *argv[])
{
int c, i, fd, flags;
const char* fname;
time_t num_seconds = 0;
struct timeval starttimeval;
struct stat fstat;
off_t seek_limit_bytes = 0, dev_size = 0;
pthread_t *read_workers = NULL, *write_workers = NULL;
test_context *read_contexts;
test_context *write_contexts;
g_debug = 0;
test_config* conf = (test_config*)malloc(sizeof(test_config));
reset_conf(conf);
srandom((unsigned int)time(NULL));
setlinebuf(stderr);
setlinebuf(stdout);
/* process arguments */
while (-1 != (c = getopt(argc, argv,
"b:" /* block size */
"o:" /* offset */
"s:" /* size (bytes) to read/write */
"r:" /* num read threads */
"w:" /* num write threads */
"R:" /* total number of reads to do (across all threads) */
"W:" /* total number of writes to do (across all threads) */
"t:" /* time (seconds) to run */
"S:" /* seek range limit (bytes) */
"d" /* debug */
"D" /* use O_DIRECT */
"h?" /* help */
))) {
switch (c) {
case 'b':
conf->block_size = (off_t)strtoul(optarg, NULL, 10);
break;
case 'o':
conf->byte_offset = (off_t)strtoul(optarg, NULL, 10);
break;
case 's':
conf->size = (size_t)strtoul(optarg, NULL, 10);
break;
case 'r':
conf->read_threads = atoi(optarg);
break;
case 'w':
conf->write_threads = atoi(optarg);
break;
case 'R':
conf->reads_remaining =
conf->total_reads = (unsigned long)strtoul(optarg, NULL, 10);
break;
case 'W':
conf->writes_remaining =
conf->total_writes = (unsigned long)strtoul(optarg, NULL, 10);
break;
case 't':
num_seconds = (time_t)strtol(optarg, NULL, 10);
break;
case 'S':
seek_limit_bytes = (off_t)strtoull(optarg, NULL, 10);
break;
case 'd':
g_debug = 1;
break;
case 'D':
conf->direct = 1;
break;
case 'h':
case '?':
usage();
exit(EXIT_SUCCESS);
default:
ERROR("Illegal argument \"%c\"", c);
usage();
return 1;
}
}
if (!conf->total_reads && !conf->total_writes && !num_seconds) {
ERROR("-r, -w, or -t is required");
usage();
return 1;
}
if (conf->byte_offset >= conf->block_size) {
ERROR("offset (%lld) cannot be greater than block size (%lld)", (long long)conf->byte_offset, (long long)conf->block_size);
return 1;
}
if (!conf->write_threads && conf->total_writes) conf->write_threads = 1;
if (!conf->read_threads &&
(conf->total_reads || !conf->write_threads)) conf->read_threads = 1;
if (!conf->total_reads) conf->total_reads = conf->reads_remaining = ULONG_MAX;
if (!conf->total_writes) conf->total_writes = conf->writes_remaining = ULONG_MAX;
if (conf->write_threads) {
//random data to write
char* loc = conf->write_buffer = (char*)alloc_aligned(conf->size);
char* end = loc + conf->size;
if (!loc) return -1;
for ( ; loc < end; loc += sizeof(long)) {
long r = random();
size_t size = (end-loc < sizeof(long)) ? (end-loc) : sizeof(long);
memcpy(loc, &r, size);
}
}
// get the device
if (optind != argc - 1) {
ERROR("Device or filename not specified");
usage();
return 1;
}
fname = argv[optind];
if (stat(fname, &fstat)) {
ERROR("Failed to stat %s: %s (%d)", fname, strerror(errno), errno);
return -1;
}
fd = open(fname, O_RDWR);
if (fd < 0) {
ERROR("Failed to open %s: %s (%d)", fname, strerror(errno), errno);
return -1;
}
if (S_ISBLK(fstat.st_mode)) {
if (ioctl(fd, BLKGETSIZE64, &dev_size)) {
ERROR("Failed to get file/device size: %s (%d)", strerror(errno), errno);
close(fd);
return -1;
}
} else if (S_ISREG(fstat.st_mode)) {
dev_size = fstat.st_size;
} else {
ERROR("%s must be a device or regular file", fname);
close(fd);
return -1;
}
if (dev_size < seek_limit_bytes) {
ERROR("File/device size %lld is smaller than seek limit %lld", (long long)dev_size, (long long)seek_limit_bytes);
close(fd);
return -1;
}
DEBUG("detected file/device size: %lld", (long long)dev_size);
if (!seek_limit_bytes) seek_limit_bytes = dev_size;
if (seek_limit_bytes <= conf->byte_offset + conf->size) {
ERROR("Offset + size must be < seek limit");
close(fd);
return -1;
}
seek_limit_bytes -= conf->byte_offset + conf->size;
conf->seek_limit_blocks = seek_limit_bytes/conf->block_size;
gconf = conf;
printconf();
if (num_seconds) {
LOG("Limiting test to %ld seconds", (long) num_seconds);
}
read_workers = (pthread_t*)malloc(conf->read_threads * sizeof(pthread_t));
write_workers = (pthread_t*)malloc(conf->write_threads * sizeof(pthread_t));
read_contexts = (test_context*)malloc(conf->read_threads * sizeof(test_context));
write_contexts = (test_context*)malloc(conf->write_threads * sizeof(test_context));
gettimeofday(&starttimeval, NULL);
conf->time_deadline = num_seconds ? (timeval_to_usec(&starttimeval)+1000000ULL*num_seconds) : ULLONG_MAX;
flags = O_RDONLY;
if (conf->direct) flags |= O_DIRECT;
for (i = 0; i < conf->read_threads; ++i) {
test_context* tc = &read_contexts[i];
reset_context(tc);
tc->fd = open(fname, flags);
if (tc->fd < 0) {
ERROR("Failed to open %s: %s (%d)", fname, strerror(errno), errno);
return -1;
}
pthread_create(&read_workers[i], NULL, &read_worker, tc);
}
flags = O_RDWR | O_SYNC;
if (conf->direct) flags |= O_DIRECT;
for (i = 0; i < conf->write_threads; ++i) {
test_context* tc = &write_contexts[i];
reset_context(tc);
tc->fd = open(fname, flags);
if (tc->fd < 0) {
ERROR("Failed to open %s: %s (%d)", fname, strerror(errno), errno);
return -1;
}
pthread_create(&write_workers[i], NULL, &write_worker, tc);
}
for (i = 0; i < conf->read_threads; ++i) {
pthread_join(read_workers[i], NULL);
DEBUG("...read thread %u done",i);
close(read_contexts[i].fd);
}
for (i = 0; i < conf->write_threads; ++i) {
pthread_join(write_workers[i], NULL);
DEBUG("...write thread %u done",i);
close(write_contexts[i].fd);
}
printresults("READ", read_contexts, gconf->read_threads);
printresults("WRITE", write_contexts, gconf->write_threads);
// TODO free context results?
close(fd);
return 0;
}