diff --git a/fio.c b/fio.c
new file mode 100644
index 0000000..6f122c9
--- /dev/null
+++ b/fio.c
@@ -0,0 +1,2192 @@
+/*
+ * fio - the flexible io tester
+ *
+ * Copyright (C) 2005 Jens Axboe <axboe@suse.de>
+ *
+ *  This program is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation; either version 2 of the License, or
+ *  (at your option) any later version.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with this program; if not, write to the Free Software
+ *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ *
+ */
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <fcntl.h>
+#include <string.h>
+#include <errno.h>
+#include <signal.h>
+#include <time.h>
+#include <math.h>
+#include <assert.h>
+#include <dirent.h>
+#include <libgen.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <sys/wait.h>
+#include <sys/ipc.h>
+#include <sys/shm.h>
+#include <sys/ioctl.h>
+#include <sys/mman.h>
+
+#include "fio.h"
+#include "os.h"
+
+#define MASK	(4095)
+
+#define ALIGN(buf)	(char *) (((unsigned long) (buf) + MASK) & ~(MASK))
+
+int groupid = 0;
+int thread_number = 0;
+static char run_str[MAX_JOBS + 1];
+int shm_id = 0;
+static LIST_HEAD(disk_list);
+static struct itimerval itimer;
+
+static void update_io_ticks(void);
+static void disk_util_timer_arm(void);
+static void print_thread_status(void);
+
+/*
+ * thread life cycle
+ */
+enum {
+	TD_NOT_CREATED = 0,
+	TD_CREATED,
+	TD_RUNNING,
+	TD_VERIFYING,
+	TD_EXITED,
+	TD_REAPED,
+};
+
+#define should_fsync(td)	(td_write(td) && (!(td)->odirect || (td)->override_sync))
+
+static sem_t startup_sem;
+
+#define TERMINATE_ALL		(-1)
+
+static void terminate_threads(int group_id)
+{
+	int i;
+
+	for (i = 0; i < thread_number; i++) {
+		struct thread_data *td = &threads[i];
+
+		if (group_id == TERMINATE_ALL || groupid == td->groupid) {
+			td->terminate = 1;
+			td->start_delay = 0;
+		}
+	}
+}
+
+static void sig_handler(int sig)
+{
+	switch (sig) {
+		case SIGALRM:
+			update_io_ticks();
+			disk_util_timer_arm();
+			print_thread_status();
+			break;
+		default:
+			printf("\nfio: terminating on signal\n");
+			fflush(stdout);
+			terminate_threads(TERMINATE_ALL);
+			break;
+	}
+}
+
+static unsigned long utime_since(struct timeval *s, struct timeval *e)
+{
+	double sec, usec;
+
+	sec = e->tv_sec - s->tv_sec;
+	usec = e->tv_usec - s->tv_usec;
+	if (sec > 0 && usec < 0) {
+		sec--;
+		usec += 1000000;
+	}
+
+	sec *= (double) 1000000;
+
+	return sec + usec;
+}
+
+static unsigned long utime_since_now(struct timeval *s)
+{
+	struct timeval t;
+
+	gettimeofday(&t, NULL);
+	return utime_since(s, &t);
+}
+
+static unsigned long mtime_since(struct timeval *s, struct timeval *e)
+{
+	double sec, usec;
+
+	sec = e->tv_sec - s->tv_sec;
+	usec = e->tv_usec - s->tv_usec;
+	if (sec > 0 && usec < 0) {
+		sec--;
+		usec += 1000000;
+	}
+
+	sec *= (double) 1000;
+	usec /= (double) 1000;
+
+	return sec + usec;
+}
+
+static unsigned long mtime_since_now(struct timeval *s)
+{
+	struct timeval t;
+
+	gettimeofday(&t, NULL);
+	return mtime_since(s, &t);
+}
+
+static inline unsigned long msec_now(struct timeval *s)
+{
+	return s->tv_sec * 1000 + s->tv_usec / 1000;
+}
+
+static int random_map_free(struct thread_data *td, unsigned long long block)
+{
+	unsigned int idx = RAND_MAP_IDX(td, block);
+	unsigned int bit = RAND_MAP_BIT(td, block);
+
+	return (td->file_map[idx] & (1UL << bit)) == 0;
+}
+
+static int get_next_free_block(struct thread_data *td, unsigned long long *b)
+{
+	int i;
+
+	*b = 0;
+	i = 0;
+	while ((*b) * td->min_bs < td->io_size) {
+		if (td->file_map[i] != -1UL) {
+			*b += ffz(td->file_map[i]);
+			return 0;
+		}
+
+		*b += BLOCKS_PER_MAP;
+		i++;
+	}
+
+	return 1;
+}
+
+static void mark_random_map(struct thread_data *td, struct io_u *io_u)
+{
+	unsigned long block = io_u->offset / td->min_bs;
+	unsigned int blocks = 0;
+
+	while (blocks < (io_u->buflen / td->min_bs)) {
+		unsigned int idx, bit;
+
+		if (!random_map_free(td, block))
+			break;
+
+		idx = RAND_MAP_IDX(td, block);
+		bit = RAND_MAP_BIT(td, block);
+
+		assert(idx < td->num_maps);
+
+		td->file_map[idx] |= (1UL << bit);
+		block++;
+		blocks++;
+	}
+
+	if ((blocks * td->min_bs) < io_u->buflen)
+		io_u->buflen = blocks * td->min_bs;
+}
+
+static int get_next_offset(struct thread_data *td, unsigned long long *offset)
+{
+	unsigned long long b, rb;
+	long r;
+
+	if (!td->sequential) {
+		unsigned long max_blocks = td->io_size / td->min_bs;
+		int loops = 50;
+
+		do {
+			lrand48_r(&td->random_state, &r);
+			b = ((max_blocks - 1) * r / (RAND_MAX+1.0));
+			rb = b + (td->file_offset / td->min_bs);
+			loops--;
+		} while (!random_map_free(td, rb) && loops);
+
+		if (!loops) {
+			if (get_next_free_block(td, &b))
+				return 1;
+		}
+	} else
+		b = td->last_bytes / td->min_bs;
+
+	*offset = (b * td->min_bs) + td->file_offset;
+	if (*offset > td->file_size)
+		return 1;
+
+	return 0;
+}
+
+static unsigned int get_next_buflen(struct thread_data *td)
+{
+	unsigned int buflen;
+	long r;
+
+	if (td->min_bs == td->max_bs)
+		buflen = td->min_bs;
+	else {
+		lrand48_r(&td->bsrange_state, &r);
+		buflen = (1 + (double) (td->max_bs - 1) * r / (RAND_MAX + 1.0));
+		buflen = (buflen + td->min_bs - 1) & ~(td->min_bs - 1);
+	}
+
+	if (buflen > td->io_size - td->this_io_bytes[td->ddir])
+		buflen = td->io_size - td->this_io_bytes[td->ddir];
+
+	return buflen;
+}
+
+static inline void add_stat_sample(struct io_stat *is, unsigned long val)
+{
+	if (val > is->max_val)
+		is->max_val = val;
+	if (val < is->min_val)
+		is->min_val = val;
+
+	is->val += val;
+	is->val_sq += val * val;
+	is->samples++;
+}
+
+static void add_log_sample(struct thread_data *td, struct io_log *iolog,
+			   unsigned long val, int ddir)
+{
+	if (iolog->nr_samples == iolog->max_samples) {
+		int new_size = sizeof(struct io_sample) * iolog->max_samples*2;
+
+		iolog->log = realloc(iolog->log, new_size);
+		iolog->max_samples <<= 1;
+	}
+
+	iolog->log[iolog->nr_samples].val = val;
+	iolog->log[iolog->nr_samples].time = mtime_since_now(&td->epoch);
+	iolog->log[iolog->nr_samples].ddir = ddir;
+	iolog->nr_samples++;
+}
+
+static void add_clat_sample(struct thread_data *td, int ddir,unsigned long msec)
+{
+	add_stat_sample(&td->clat_stat[ddir], msec);
+
+	if (td->clat_log)
+		add_log_sample(td, td->clat_log, msec, ddir);
+}
+
+static void add_slat_sample(struct thread_data *td, int ddir,unsigned long msec)
+{
+	add_stat_sample(&td->slat_stat[ddir], msec);
+
+	if (td->slat_log)
+		add_log_sample(td, td->slat_log, msec, ddir);
+}
+
+static void add_bw_sample(struct thread_data *td, int ddir)
+{
+	unsigned long spent = mtime_since_now(&td->stat_sample_time[ddir]);
+	unsigned long rate;
+
+	if (spent < td->bw_avg_time)
+		return;
+
+	rate = (td->this_io_bytes[ddir] - td->stat_io_bytes[ddir]) / spent;
+	add_stat_sample(&td->bw_stat[ddir], rate);
+
+	if (td->bw_log)
+		add_log_sample(td, td->bw_log, rate, ddir);
+
+	gettimeofday(&td->stat_sample_time[ddir], NULL);
+	td->stat_io_bytes[ddir] = td->this_io_bytes[ddir];
+}
+
+/*
+ * busy looping version for the last few usec
+ */
+static void __usec_sleep(unsigned int usec)
+{
+	struct timeval start;
+
+	gettimeofday(&start, NULL);
+	while (utime_since_now(&start) < usec)
+		nop;
+}
+
+static void usec_sleep(struct thread_data *td, unsigned long usec)
+{
+	struct timespec req, rem;
+
+	req.tv_sec = usec / 1000000;
+	req.tv_nsec = usec * 1000 - req.tv_sec * 1000000;
+
+	do {
+		if (usec < 5000) {
+			__usec_sleep(usec);
+			break;
+		}
+
+		rem.tv_sec = rem.tv_nsec = 0;
+		if (nanosleep(&req, &rem) < 0)
+			break;
+
+		if ((rem.tv_sec + rem.tv_nsec) == 0)
+			break;
+
+		req.tv_nsec = rem.tv_nsec;
+		req.tv_sec = rem.tv_sec;
+
+		usec = rem.tv_sec * 1000000 + rem.tv_nsec / 1000;
+	} while (!td->terminate);
+}
+
+static void rate_throttle(struct thread_data *td, unsigned long time_spent,
+			  unsigned int bytes)
+{
+	unsigned long usec_cycle;
+
+	if (!td->rate)
+		return;
+
+	usec_cycle = td->rate_usec_cycle * (bytes / td->min_bs);
+
+	if (time_spent < usec_cycle) {
+		unsigned long s = usec_cycle - time_spent;
+
+		td->rate_pending_usleep += s;
+		if (td->rate_pending_usleep >= 100000) {
+			usec_sleep(td, td->rate_pending_usleep);
+			td->rate_pending_usleep = 0;
+		}
+	} else {
+		long overtime = time_spent - usec_cycle;
+
+		td->rate_pending_usleep -= overtime;
+	}
+}
+
+static int check_min_rate(struct thread_data *td, struct timeval *now)
+{
+	unsigned long spent;
+	unsigned long rate;
+	int ddir = td->ddir;
+
+	/*
+	 * allow a 2 second settle period in the beginning
+	 */
+	if (mtime_since(&td->start, now) < 2000)
+		return 0;
+
+	/*
+	 * if rate blocks is set, sample is running
+	 */
+	if (td->rate_bytes) {
+		spent = mtime_since(&td->lastrate, now);
+		if (spent < td->ratecycle)
+			return 0;
+
+		rate = (td->this_io_bytes[ddir] - td->rate_bytes) / spent;
+		if (rate < td->ratemin) {
+			printf("Client%d: min rate %d not met, got %ldKiB/sec\n", td->thread_number, td->ratemin, rate);
+			if (rate_quit)
+				terminate_threads(td->groupid);
+			return 1;
+		}
+	}
+
+	td->rate_bytes = td->this_io_bytes[ddir];
+	memcpy(&td->lastrate, now, sizeof(*now));
+	return 0;
+}
+
+static inline int runtime_exceeded(struct thread_data *td, struct timeval *t)
+{
+	if (!td->timeout)
+		return 0;
+	if (mtime_since(&td->epoch, t) >= td->timeout * 1000)
+		return 1;
+
+	return 0;
+}
+
+static void fill_random_bytes(struct thread_data *td,
+			      unsigned char *p, unsigned int len)
+{
+	unsigned int todo;
+	double r;
+
+	while (len) {
+		drand48_r(&td->verify_state, &r);
+
+		/*
+		 * lrand48_r seems to be broken and only fill the bottom
+		 * 32-bits, even on 64-bit archs with 64-bit longs
+		 */
+		todo = sizeof(r);
+		if (todo > len)
+			todo = len;
+
+		memcpy(p, &r, todo);
+
+		len -= todo;
+		p += todo;
+	}
+}
+
+static void hexdump(void *buffer, int len)
+{
+	unsigned char *p = buffer;
+	int i;
+
+	for (i = 0; i < len; i++)
+		printf("%02x", p[i]);
+	printf("\n");
+}
+
+static int verify_io_u_crc32(struct verify_header *hdr, struct io_u *io_u)
+{
+	unsigned char *p = (unsigned char *) io_u->buf;
+	unsigned long c;
+	int ret;
+
+	p += sizeof(*hdr);
+	c = crc32(p, hdr->len - sizeof(*hdr));
+	ret = c != hdr->crc32;
+
+	if (ret) {
+		fprintf(stderr, "crc32: verify failed at %llu/%u\n", io_u->offset, io_u->buflen);
+		fprintf(stderr, "crc32: wanted %lx, got %lx\n", hdr->crc32, c);
+	}
+
+	return ret;
+}
+
+static int verify_io_u_md5(struct verify_header *hdr, struct io_u *io_u)
+{
+	unsigned char *p = (unsigned char *) io_u->buf;
+	struct md5_ctx md5_ctx;
+	int ret;
+
+	memset(&md5_ctx, 0, sizeof(md5_ctx));
+	p += sizeof(*hdr);
+	md5_update(&md5_ctx, p, hdr->len - sizeof(*hdr));
+
+	ret = memcmp(hdr->md5_digest, md5_ctx.hash, sizeof(md5_ctx.hash));
+	if (ret) {
+		fprintf(stderr, "md5: verify failed at %llu/%u\n", io_u->offset, io_u->buflen);
+		hexdump(hdr->md5_digest, sizeof(hdr->md5_digest));
+		hexdump(md5_ctx.hash, sizeof(md5_ctx.hash));
+	}
+
+	return ret;
+}
+
+static int verify_io_u(struct io_u *io_u)
+{
+	struct verify_header *hdr = (struct verify_header *) io_u->buf;
+	int ret;
+
+	if (hdr->fio_magic != FIO_HDR_MAGIC)
+		return 1;
+
+	if (hdr->verify_type == VERIFY_MD5)
+		ret = verify_io_u_md5(hdr, io_u);
+	else if (hdr->verify_type == VERIFY_CRC32)
+		ret = verify_io_u_crc32(hdr, io_u);
+	else {
+		fprintf(stderr, "Bad verify type %d\n", hdr->verify_type);
+		ret = 1;
+	}
+
+	return ret;
+}
+
+static void fill_crc32(struct verify_header *hdr, void *p, unsigned int len)
+{
+	hdr->crc32 = crc32(p, len);
+}
+
+static void fill_md5(struct verify_header *hdr, void *p, unsigned int len)
+{
+	struct md5_ctx md5_ctx;
+
+	memset(&md5_ctx, 0, sizeof(md5_ctx));
+	md5_update(&md5_ctx, p, len);
+	memcpy(hdr->md5_digest, md5_ctx.hash, sizeof(md5_ctx.hash));
+}
+
+/*
+ * fill body of io_u->buf with random data and add a header with the
+ * (eg) sha1sum of that data.
+ */
+static void populate_io_u(struct thread_data *td, struct io_u *io_u)
+{
+	unsigned char *p = (unsigned char *) io_u->buf;
+	struct verify_header hdr;
+
+	hdr.fio_magic = FIO_HDR_MAGIC;
+	hdr.len = io_u->buflen;
+	p += sizeof(hdr);
+	fill_random_bytes(td, p, io_u->buflen - sizeof(hdr));
+
+	if (td->verify == VERIFY_MD5) {
+		fill_md5(&hdr, p, io_u->buflen - sizeof(hdr));
+		hdr.verify_type = VERIFY_MD5;
+	} else {
+		fill_crc32(&hdr, p, io_u->buflen - sizeof(hdr));
+		hdr.verify_type = VERIFY_CRC32;
+	}
+
+	memcpy(io_u->buf, &hdr, sizeof(hdr));
+}
+
+static void put_io_u(struct thread_data *td, struct io_u *io_u)
+{
+	list_del(&io_u->list);
+	list_add(&io_u->list, &td->io_u_freelist);
+	td->cur_depth--;
+}
+
+#define queue_full(td)	(list_empty(&(td)->io_u_freelist))
+
+static struct io_u *__get_io_u(struct thread_data *td)
+{
+	struct io_u *io_u;
+
+	if (queue_full(td))
+		return NULL;
+
+	io_u = list_entry(td->io_u_freelist.next, struct io_u, list);
+	io_u->error = 0;
+	io_u->resid = 0;
+	list_del(&io_u->list);
+	list_add(&io_u->list, &td->io_u_busylist);
+	td->cur_depth++;
+	return io_u;
+}
+
+static int td_io_prep(struct thread_data *td, struct io_u *io_u, int read)
+{
+	if (read)
+		io_u->ddir = DDIR_READ;
+	else
+		io_u->ddir = DDIR_WRITE;
+
+	if (td->io_prep && td->io_prep(td, io_u))
+		return 1;
+
+	return 0;
+}
+
+static struct io_u *get_io_u(struct thread_data *td)
+{
+	struct io_u *io_u;
+
+	io_u = __get_io_u(td);
+	if (!io_u)
+		return NULL;
+
+	if (get_next_offset(td, &io_u->offset)) {
+		put_io_u(td, io_u);
+		return NULL;
+	}
+
+	io_u->buflen = get_next_buflen(td);
+	if (!io_u->buflen) {
+		put_io_u(td, io_u);
+		return NULL;
+	}
+
+	if (io_u->buflen + io_u->offset > td->file_size)
+		io_u->buflen = td->file_size - io_u->offset;
+
+	if (!io_u->buflen) {
+		put_io_u(td, io_u);
+		return NULL;
+	}
+
+	if (!td->sequential)
+		mark_random_map(td, io_u);
+
+	td->last_bytes += io_u->buflen;
+
+	if (td->verify != VERIFY_NONE)
+		populate_io_u(td, io_u);
+
+	if (td_io_prep(td, io_u, td_read(td))) {
+		put_io_u(td, io_u);
+		return NULL;
+	}
+
+	gettimeofday(&io_u->start_time, NULL);
+	return io_u;
+}
+
+static inline void td_set_runstate(struct thread_data *td, int runstate)
+{
+	td->old_runstate = td->runstate;
+	td->runstate = runstate;
+}
+
+static int get_next_verify(struct thread_data *td,
+			   unsigned long long *offset, unsigned int *len)
+{
+	struct io_piece *ipo;
+
+	if (list_empty(&td->io_hist_list))
+		return 1;
+
+	ipo = list_entry(td->io_hist_list.next, struct io_piece, list);
+	list_del(&ipo->list);
+
+	*offset = ipo->offset;
+	*len = ipo->len;
+	free(ipo);
+	return 0;
+}
+
+static void prune_io_piece_log(struct thread_data *td)
+{
+	struct io_piece *ipo;
+
+	while (!list_empty(&td->io_hist_list)) {
+		ipo = list_entry(td->io_hist_list.next, struct io_piece, list);
+
+		list_del(&ipo->list);
+		free(ipo);
+	}
+}
+
+/*
+ * log a succesful write, so we can unwind the log for verify
+ */
+static void log_io_piece(struct thread_data *td, struct io_u *io_u)
+{
+	struct io_piece *ipo = malloc(sizeof(struct io_piece));
+	struct list_head *entry;
+
+	INIT_LIST_HEAD(&ipo->list);
+	ipo->offset = io_u->offset;
+	ipo->len = io_u->buflen;
+
+	/*
+	 * for random io where the writes extend the file, it will typically
+	 * be laid out with the block scattered as written. it's faster to
+	 * read them in in that order again, so don't sort
+	 */
+	if (td->sequential || !td->overwrite) {
+		list_add_tail(&ipo->list, &td->io_hist_list);
+		return;
+	}
+
+	/*
+	 * for random io, sort the list so verify will run faster
+	 */
+	entry = &td->io_hist_list;
+	while ((entry = entry->prev) != &td->io_hist_list) {
+		struct io_piece *__ipo = list_entry(entry, struct io_piece, list);
+
+		if (__ipo->offset < ipo->offset)
+			break;
+	}
+
+	list_add(&ipo->list, entry);
+}
+
+static int sync_td(struct thread_data *td)
+{
+	if (td->io_sync)
+		return td->io_sync(td);
+
+	return 0;
+}
+
+static int io_u_getevents(struct thread_data *td, int min, int max,
+			  struct timespec *t)
+{
+	return td->io_getevents(td, min, max, t);
+}
+
+static int io_u_queue(struct thread_data *td, struct io_u *io_u)
+{
+	gettimeofday(&io_u->issue_time, NULL);
+
+	return td->io_queue(td, io_u);
+}
+
+#define iocb_time(iocb)	((unsigned long) (iocb)->data)
+
+static void io_completed(struct thread_data *td, struct io_u *io_u,
+			 struct io_completion_data *icd)
+{
+	struct timeval e;
+	unsigned long msec;
+
+	gettimeofday(&e, NULL);
+
+	if (!io_u->error) {
+		int idx = io_u->ddir;
+
+		td->io_blocks[idx]++;
+		td->io_bytes[idx] += (io_u->buflen - io_u->resid);
+		td->this_io_bytes[idx] += (io_u->buflen - io_u->resid);
+
+		msec = mtime_since(&io_u->issue_time, &e);
+
+		add_clat_sample(td, io_u->ddir, msec);
+		add_bw_sample(td, io_u->ddir);
+
+		if (td_write(td) && io_u->ddir == DDIR_WRITE)
+			log_io_piece(td, io_u);
+
+		icd->bytes_done[idx] += (io_u->buflen - io_u->resid);
+	} else
+		icd->error = io_u->error;
+}
+
+static void ios_completed(struct thread_data *td,struct io_completion_data *icd)
+{
+	struct io_u *io_u;
+	int i;
+
+	icd->error = 0;
+	icd->bytes_done[0] = icd->bytes_done[1] = 0;
+
+	for (i = 0; i < icd->nr; i++) {
+		io_u = td->io_event(td, i);
+
+		io_completed(td, io_u, icd);
+		put_io_u(td, io_u);
+	}
+}
+
+static void cleanup_pending_aio(struct thread_data *td)
+{
+	struct timespec ts = { .tv_sec = 0, .tv_nsec = 0};
+	struct list_head *entry, *n;
+	struct io_completion_data icd;
+	struct io_u *io_u;
+	int r;
+
+	/*
+	 * get immediately available events, if any
+	 */
+	r = io_u_getevents(td, 0, td->cur_depth, &ts);
+	if (r > 0) {
+		icd.nr = r;
+		ios_completed(td, &icd);
+	}
+
+	/*
+	 * now cancel remaining active events
+	 */
+	if (td->io_cancel) {
+		list_for_each_safe(entry, n, &td->io_u_busylist) {
+			io_u = list_entry(entry, struct io_u, list);
+
+			r = td->io_cancel(td, io_u);
+			if (!r)
+				put_io_u(td, io_u);
+		}
+	}
+
+	if (td->cur_depth) {
+		r = io_u_getevents(td, td->cur_depth, td->cur_depth, NULL);
+		if (r > 0) {
+			icd.nr = r;
+			ios_completed(td, &icd);
+		}
+	}
+}
+
+static int do_io_u_verify(struct thread_data *td, struct io_u **io_u)
+{
+	struct io_u *v_io_u = *io_u;
+	int ret = 0;
+
+	if (v_io_u) {
+		ret = verify_io_u(v_io_u);
+		put_io_u(td, v_io_u);
+		*io_u = NULL;
+	}
+
+	return ret;
+}
+
+static void do_verify(struct thread_data *td)
+{
+	struct timeval t;
+	struct io_u *io_u, *v_io_u = NULL;
+	struct io_completion_data icd;
+	int ret;
+
+	td_set_runstate(td, TD_VERIFYING);
+
+	do {
+		if (td->terminate)
+			break;
+
+		gettimeofday(&t, NULL);
+		if (runtime_exceeded(td, &t))
+			break;
+
+		io_u = __get_io_u(td);
+		if (!io_u)
+			break;
+
+		if (get_next_verify(td, &io_u->offset, &io_u->buflen)) {
+			put_io_u(td, io_u);
+			break;
+		}
+
+		if (td_io_prep(td, io_u, 1)) {
+			put_io_u(td, io_u);
+			break;
+		}
+
+		ret = io_u_queue(td, io_u);
+		if (ret) {
+			put_io_u(td, io_u);
+			td_verror(td, ret);
+			break;
+		}
+
+		/*
+		 * we have one pending to verify, do that while
+		 * we are doing io on the next one
+		 */
+		if (do_io_u_verify(td, &v_io_u))
+			break;
+
+		ret = io_u_getevents(td, 1, 1, NULL);
+		if (ret != 1) {
+			if (ret < 0)
+				td_verror(td, ret);
+			break;
+		}
+
+		v_io_u = td->io_event(td, 0);
+		icd.nr = 1;
+		icd.error = 0;
+		io_completed(td, v_io_u, &icd);
+
+		if (icd.error) {
+			td_verror(td, icd.error);
+			put_io_u(td, v_io_u);
+			v_io_u = NULL;
+			break;
+		}
+
+		td->cur_off = v_io_u->offset + v_io_u->buflen;
+
+		/*
+		 * if we can't submit more io, we need to verify now
+		 */
+		if (queue_full(td) && do_io_u_verify(td, &v_io_u))
+			break;
+
+	} while (1);
+
+	do_io_u_verify(td, &v_io_u);
+
+	if (td->cur_depth)
+		cleanup_pending_aio(td);
+
+	td_set_runstate(td, TD_RUNNING);
+}
+
+static void do_io(struct thread_data *td)
+{
+	struct io_completion_data icd;
+	struct timeval s, e;
+	unsigned long usec;
+
+	while (td->this_io_bytes[td->ddir] < td->io_size) {
+		struct timespec ts = { .tv_sec = 0, .tv_nsec = 0};
+		struct timespec *timeout;
+		int ret, min_evts = 0;
+		struct io_u *io_u;
+
+		if (td->terminate)
+			break;
+
+		io_u = get_io_u(td);
+		if (!io_u)
+			break;
+
+		memcpy(&s, &io_u->start_time, sizeof(s));
+
+		ret = io_u_queue(td, io_u);
+		if (ret) {
+			put_io_u(td, io_u);
+			td_verror(td, ret);
+			break;
+		}
+
+		add_slat_sample(td, io_u->ddir, mtime_since(&io_u->start_time, &io_u->issue_time));
+
+		if (td->cur_depth < td->iodepth) {
+			timeout = &ts;
+			min_evts = 0;
+		} else {
+			timeout = NULL;
+			min_evts = 1;
+		}
+
+		ret = io_u_getevents(td, min_evts, td->cur_depth, timeout);
+		if (ret < 0) {
+			td_verror(td, ret);
+			break;
+		} else if (!ret)
+			continue;
+
+		icd.nr = ret;
+		ios_completed(td, &icd);
+		if (icd.error) {
+			td_verror(td, icd.error);
+			break;
+		}
+
+		/*
+		 * the rate is batched for now, it should work for batches
+		 * of completions except the very first one which may look
+		 * a little bursty
+		 */
+		gettimeofday(&e, NULL);
+		usec = utime_since(&s, &e);
+
+		rate_throttle(td, usec, icd.bytes_done[td->ddir]);
+
+		if (check_min_rate(td, &e)) {
+			td_verror(td, ENOMEM);
+			break;
+		}
+
+		if (runtime_exceeded(td, &e))
+			break;
+
+		if (td->thinktime)
+			usec_sleep(td, td->thinktime);
+
+		if (should_fsync(td) && td->fsync_blocks &&
+		    (td->io_blocks[DDIR_WRITE] % td->fsync_blocks) == 0)
+			sync_td(td);
+	}
+
+	if (td->cur_depth)
+		cleanup_pending_aio(td);
+
+	if (should_fsync(td))
+		sync_td(td);
+}
+
+static void cleanup_io(struct thread_data *td)
+{
+	if (td->io_cleanup)
+		td->io_cleanup(td);
+}
+
+static int init_io(struct thread_data *td)
+{
+	if (td->io_engine == FIO_SYNCIO)
+		return fio_syncio_init(td);
+	else if (td->io_engine == FIO_MMAPIO)
+		return fio_mmapio_init(td);
+	else if (td->io_engine == FIO_LIBAIO)
+		return fio_libaio_init(td);
+	else if (td->io_engine == FIO_POSIXAIO)
+		return fio_posixaio_init(td);
+	else if (td->io_engine == FIO_SGIO)
+		return fio_sgio_init(td);
+	else {
+		fprintf(stderr, "bad io_engine %d\n", td->io_engine);
+		return 1;
+	}
+}
+
+static void cleanup_io_u(struct thread_data *td)
+{
+	struct list_head *entry, *n;
+	struct io_u *io_u;
+
+	list_for_each_safe(entry, n, &td->io_u_freelist) {
+		io_u = list_entry(entry, struct io_u, list);
+
+		list_del(&io_u->list);
+		free(io_u);
+	}
+
+	if (td->mem_type == MEM_MALLOC)
+		free(td->orig_buffer);
+	else if (td->mem_type == MEM_SHM) {
+		struct shmid_ds sbuf;
+
+		shmdt(td->orig_buffer);
+		shmctl(td->shm_id, IPC_RMID, &sbuf);
+	} else if (td->mem_type == MEM_MMAP)
+		munmap(td->orig_buffer, td->orig_buffer_size);
+	else
+		fprintf(stderr, "Bad memory type %d\n", td->mem_type);
+
+	td->orig_buffer = NULL;
+}
+
+static int init_io_u(struct thread_data *td)
+{
+	struct io_u *io_u;
+	int i, max_units;
+	char *p;
+
+	if (td->io_engine & FIO_SYNCIO)
+		max_units = 1;
+	else
+		max_units = td->iodepth;
+
+	td->orig_buffer_size = td->max_bs * max_units + MASK;
+
+	if (td->mem_type == MEM_MALLOC)
+		td->orig_buffer = malloc(td->orig_buffer_size);
+	else if (td->mem_type == MEM_SHM) {
+		td->shm_id = shmget(IPC_PRIVATE, td->orig_buffer_size, IPC_CREAT | 0600);
+		if (td->shm_id < 0) {
+			td_verror(td, errno);
+			perror("shmget");
+			return 1;
+		}
+
+		td->orig_buffer = shmat(td->shm_id, NULL, 0);
+		if (td->orig_buffer == (void *) -1) {
+			td_verror(td, errno);
+			perror("shmat");
+			td->orig_buffer = NULL;
+			return 1;
+		}
+	} else if (td->mem_type == MEM_MMAP) {
+		td->orig_buffer = mmap(NULL, td->orig_buffer_size, PROT_READ | PROT_WRITE, MAP_PRIVATE | OS_MAP_ANON, 0, 0);
+		if (td->orig_buffer == MAP_FAILED) {
+			td_verror(td, errno);
+			perror("mmap");
+			td->orig_buffer = NULL;
+			return 1;
+		}
+	}
+
+	INIT_LIST_HEAD(&td->io_u_freelist);
+	INIT_LIST_HEAD(&td->io_u_busylist);
+	INIT_LIST_HEAD(&td->io_hist_list);
+
+	p = ALIGN(td->orig_buffer);
+	for (i = 0; i < max_units; i++) {
+		io_u = malloc(sizeof(*io_u));
+		memset(io_u, 0, sizeof(*io_u));
+		INIT_LIST_HEAD(&io_u->list);
+
+		io_u->buf = p + td->max_bs * i;
+		list_add(&io_u->list, &td->io_u_freelist);
+	}
+
+	return 0;
+}
+
+static int create_file(struct thread_data *td, unsigned long long size,
+		       int extend)
+{
+	unsigned long long left;
+	unsigned int bs;
+	int r, oflags;
+	char *b;
+
+	/*
+	 * unless specifically asked for overwrite, let normal io extend it
+	 */
+	if (td_write(td) && !td->overwrite)
+		return 0;
+
+	if (!size) {
+		fprintf(stderr, "Need size for create\n");
+		td_verror(td, EINVAL);
+		return 1;
+	}
+
+	if (!extend) {
+		oflags = O_CREAT | O_TRUNC;
+		printf("Client%d: Laying out IO file (%LuMiB)\n", td->thread_number, size >> 20);
+	} else {
+		oflags = O_APPEND;
+		printf("Client%d: Extending IO file (%Lu -> %LuMiB)\n", td->thread_number, (td->file_size - size) >> 20, td->file_size >> 20);
+	}
+
+	td->fd = open(td->file_name, O_WRONLY | oflags, 0644);
+	if (td->fd < 0) {
+		td_verror(td, errno);
+		return 1;
+	}
+
+	if (!extend && ftruncate(td->fd, td->file_size) == -1) {
+		td_verror(td, errno);
+		return 1;
+	}
+
+	td->io_size = td->file_size;
+	b = malloc(td->max_bs);
+	memset(b, 0, td->max_bs);
+
+	left = size;
+	while (left && !td->terminate) {
+		bs = td->max_bs;
+		if (bs > left)
+			bs = left;
+
+		r = write(td->fd, b, bs);
+
+		if (r == (int) bs) {
+			left -= bs;
+			continue;
+		} else {
+			if (r < 0)
+				td_verror(td, errno);
+			else
+				td_verror(td, EIO);
+
+			break;
+		}
+	}
+
+	if (td->terminate)
+		unlink(td->file_name);
+	else if (td->create_fsync)
+		fsync(td->fd);
+
+	close(td->fd);
+	td->fd = -1;
+	free(b);
+	return 0;
+}
+
+static int file_size(struct thread_data *td)
+{
+	struct stat st;
+
+	if (fstat(td->fd, &st) == -1) {
+		td_verror(td, errno);
+		return 1;
+	}
+
+	if (!td->file_size)
+		td->file_size = st.st_size;
+
+	return 0;
+}
+
+static int bdev_size(struct thread_data *td)
+{
+	size_t bytes;
+	int r;
+
+	r = blockdev_size(td->fd, &bytes);
+	if (r) {
+		td_verror(td, r);
+		return 1;
+	}
+
+	/*
+	 * no extend possibilities, so limit size to device size if too large
+	 */
+	if (!td->file_size || td->file_size > bytes)
+		td->file_size = bytes;
+
+	return 0;
+}
+
+static int get_file_size(struct thread_data *td)
+{
+	int ret;
+
+	if (td->filetype == FIO_TYPE_FILE)
+		ret = file_size(td);
+	else
+		ret = bdev_size(td);
+
+	if (ret)
+		return ret;
+
+	if (td->file_offset > td->file_size) {
+		fprintf(stderr, "Client%d: offset larger than length (%Lu > %Lu)\n", td->thread_number, td->file_offset, td->file_size);
+		return 1;
+	}
+
+	td->io_size = td->file_size - td->file_offset;
+	if (td->io_size == 0) {
+		fprintf(stderr, "Client%d: no io blocks\n", td->thread_number);
+		td_verror(td, EINVAL);
+		return 1;
+	}
+
+	td->total_io_size = td->io_size * td->loops;
+	return 0;
+}
+
+static int setup_file_mmap(struct thread_data *td)
+{
+	int flags;
+
+	if (td_read(td))
+		flags = PROT_READ;
+	else {
+		flags = PROT_WRITE;
+
+		if (td->verify != VERIFY_NONE)
+			flags |= PROT_READ;
+	}
+
+	td->mmap = mmap(NULL, td->file_size, flags, MAP_SHARED, td->fd, td->file_offset);
+	if (td->mmap == MAP_FAILED) {
+		td->mmap = NULL;
+		td_verror(td, errno);
+		return 1;
+	}
+
+	if (td->invalidate_cache) {
+		if (madvise(td->mmap, td->file_size, MADV_DONTNEED) < 0) {
+			td_verror(td, errno);
+			return 1;
+		}
+	}
+
+	if (td->sequential) {
+		if (madvise(td->mmap, td->file_size, MADV_SEQUENTIAL) < 0) {
+			td_verror(td, errno);
+			return 1;
+		}
+	} else {
+		if (madvise(td->mmap, td->file_size, MADV_RANDOM) < 0) {
+			td_verror(td, errno);
+			return 1;
+		}
+	}
+
+	return 0;
+}
+
+static int setup_file_plain(struct thread_data *td)
+{
+	if (td->invalidate_cache) {
+		if (fadvise(td->fd, td->file_offset, td->file_size, POSIX_FADV_DONTNEED) < 0) {
+			td_verror(td, errno);
+			return 1;
+		}
+	}
+
+	if (td->sequential) {
+		if (fadvise(td->fd, td->file_offset, td->file_size, POSIX_FADV_SEQUENTIAL) < 0) {
+			td_verror(td, errno);
+			return 1;
+		}
+	} else {
+		if (fadvise(td->fd, td->file_offset, td->file_size, POSIX_FADV_RANDOM) < 0) {
+			td_verror(td, errno);
+			return 1;
+		}
+	}
+
+	return 0;
+}
+
+static int setup_file(struct thread_data *td)
+{
+	struct stat st;
+	int flags = 0;
+
+	if (stat(td->file_name, &st) == -1) {
+		if (errno != ENOENT) {
+			td_verror(td, errno);
+			return 1;
+		}
+		if (!td->create_file) {
+			td_verror(td, ENOENT);
+			return 1;
+		}
+		if (create_file(td, td->file_size, 0))
+			return 1;
+	} else if (td->filetype == FIO_TYPE_FILE) {
+		if (st.st_size < td->file_size) {
+			if (create_file(td, td->file_size - st.st_size, 1))
+				return 1;
+		}
+	}
+
+	if (td->odirect)
+		flags |= O_DIRECT;
+
+	if (td_read(td))
+		td->fd = open(td->file_name, flags | O_RDONLY);
+	else {
+		if (td->filetype == FIO_TYPE_FILE) {
+			if (!td->overwrite)
+				flags |= O_TRUNC;
+
+			flags |= O_CREAT;
+		}
+		if (td->sync_io)
+			flags |= O_SYNC;
+
+		flags |= O_RDWR;
+
+		td->fd = open(td->file_name, flags, 0600);
+	}
+
+	if (td->fd == -1) {
+		td_verror(td, errno);
+		return 1;
+	}
+
+	if (get_file_size(td))
+		return 1;
+
+	if (td->io_engine != FIO_MMAPIO)
+		return setup_file_plain(td);
+	else
+		return setup_file_mmap(td);
+}
+
+static int check_dev_match(dev_t dev, char *path)
+{
+	unsigned int major, minor;
+	char line[256], *p;
+	FILE *f;
+
+	f = fopen(path, "r");
+	if (!f) {
+		perror("open path");
+		return 1;
+	}
+
+	p = fgets(line, sizeof(line), f);
+	if (!p) {
+		fclose(f);
+		return 1;
+	}
+
+	if (sscanf(p, "%u:%u", &major, &minor) != 2) {
+		fclose(f);
+		return 1;
+	}
+
+	if (((major << 8) | minor) == dev) {
+		fclose(f);
+		return 0;
+	}
+
+	fclose(f);
+	return 1;
+}
+
+static int find_block_dir(dev_t dev, char *path)
+{
+	struct dirent *dir;
+	struct stat st;
+	int found = 0;
+	DIR *D;
+
+	D = opendir(path);
+	if (!D)
+		return 0;
+
+	while ((dir = readdir(D)) != NULL) {
+		char full_path[256];
+
+		if (!strcmp(dir->d_name, ".") || !strcmp(dir->d_name, ".."))
+			continue;
+		if (!strcmp(dir->d_name, "device"))
+			continue;
+
+		sprintf(full_path, "%s/%s", path, dir->d_name);
+
+		if (!strcmp(dir->d_name, "dev")) {
+			if (!check_dev_match(dev, full_path)) {
+				found = 1;
+				break;
+			}
+		}
+
+		if (stat(full_path, &st) == -1) {
+			perror("stat");
+			break;
+		}
+
+		if (!S_ISDIR(st.st_mode) || S_ISLNK(st.st_mode))
+			continue;
+
+		found = find_block_dir(dev, full_path);
+		if (found) {
+			strcpy(path, full_path);
+			break;
+		}
+	}
+
+	closedir(D);
+	return found;
+}
+
+static int get_io_ticks(struct disk_util *du, struct disk_util_stat *dus)
+{
+	unsigned in_flight;
+	char line[256];
+	FILE *f;
+	char *p;
+
+	f = fopen(du->path, "r");
+	if (!f)
+		return 1;
+
+	p = fgets(line, sizeof(line), f);
+	if (!p) {
+		fclose(f);
+		return 1;
+	}
+
+	if (sscanf(p, "%u %u %llu %u %u %u %llu %u %u %u %u\n", &dus->ios[0], &dus->merges[0], &dus->sectors[0], &dus->ticks[0], &dus->ios[1], &dus->merges[1], &dus->sectors[1], &dus->ticks[1], &in_flight, &dus->io_ticks, &dus->time_in_queue) != 11) {
+		fclose(f);
+		return 1;
+	}
+
+	fclose(f);
+	return 0;
+}
+
+static void update_io_tick_disk(struct disk_util *du)
+{
+	struct disk_util_stat __dus, *dus, *ldus;
+	struct timeval t;
+
+	if (get_io_ticks(du, &__dus))
+		return;
+
+	dus = &du->dus;
+	ldus = &du->last_dus;
+
+	dus->sectors[0] += (__dus.sectors[0] - ldus->sectors[0]);
+	dus->sectors[1] += (__dus.sectors[1] - ldus->sectors[1]);
+	dus->ios[0] += (__dus.ios[0] - ldus->ios[0]);
+	dus->ios[1] += (__dus.ios[1] - ldus->ios[1]);
+	dus->merges[0] += (__dus.merges[0] - ldus->merges[0]);
+	dus->merges[1] += (__dus.merges[1] - ldus->merges[1]);
+	dus->ticks[0] += (__dus.ticks[0] - ldus->ticks[0]);
+	dus->ticks[1] += (__dus.ticks[1] - ldus->ticks[1]);
+	dus->io_ticks += (__dus.io_ticks - ldus->io_ticks);
+	dus->time_in_queue += (__dus.time_in_queue - ldus->time_in_queue);
+
+	gettimeofday(&t, NULL);
+	du->msec += mtime_since(&du->time, &t);
+	memcpy(&du->time, &t, sizeof(t));
+	memcpy(ldus, &__dus, sizeof(__dus));
+}
+
+static void update_io_ticks(void)
+{
+	struct list_head *entry;
+	struct disk_util *du;
+
+	list_for_each(entry, &disk_list) {
+		du = list_entry(entry, struct disk_util, list);
+		update_io_tick_disk(du);
+	}
+}
+
+static int disk_util_exists(dev_t dev)
+{
+	struct list_head *entry;
+	struct disk_util *du;
+
+	list_for_each(entry, &disk_list) {
+		du = list_entry(entry, struct disk_util, list);
+
+		if (du->dev == dev)
+			return 1;
+	}
+
+	return 0;
+}
+
+static void disk_util_add(dev_t dev, char *path)
+{
+	struct disk_util *du = malloc(sizeof(*du));
+
+	memset(du, 0, sizeof(*du));
+	INIT_LIST_HEAD(&du->list);
+	sprintf(du->path, "%s/stat", path);
+	du->name = strdup(basename(path));
+	du->dev = dev;
+
+	gettimeofday(&du->time, NULL);
+	get_io_ticks(du, &du->last_dus);
+
+	list_add_tail(&du->list, &disk_list);
+}
+
+static void init_disk_util(struct thread_data *td)
+{
+	struct stat st;
+	char foo[256], tmp[256];
+	dev_t dev;
+	char *p;
+
+	if (!td->do_disk_util)
+		return;
+
+	if (!stat(td->file_name, &st)) {
+		if (S_ISBLK(st.st_mode))
+			dev = st.st_rdev;
+		else
+			dev = st.st_dev;
+	} else {
+		/*
+		 * must be a file, open "." in that path
+		 */
+		strcpy(foo, td->file_name);
+		p = dirname(foo);
+		if (stat(p, &st)) {
+			perror("disk util stat");
+			return;
+		}
+
+		dev = st.st_dev;
+	}
+
+	if (disk_util_exists(dev))
+		return;
+		
+	sprintf(foo, "/sys/block");
+	if (!find_block_dir(dev, foo))
+		return;
+
+	/*
+	 * if this is inside a partition dir, jump back to parent
+	 */
+	sprintf(tmp, "%s/queue", foo);
+	if (stat(tmp, &st)) {
+		p = dirname(foo);
+		sprintf(tmp, "%s/queue", p);
+		if (stat(tmp, &st)) {
+			fprintf(stderr, "unknown sysfs layout\n");
+			return;
+		}
+		sprintf(foo, "%s", p);
+	}
+
+	disk_util_add(dev, foo);
+}
+
+static void disk_util_timer_arm(void)
+{
+	itimer.it_value.tv_sec = 0;
+	itimer.it_value.tv_usec = DISK_UTIL_MSEC * 1000;
+	setitimer(ITIMER_REAL, &itimer, NULL);
+}
+
+static void clear_io_state(struct thread_data *td)
+{
+	if (td->io_engine == FIO_SYNCIO)
+		lseek(td->fd, SEEK_SET, 0);
+
+	td->cur_off = 0;
+	td->last_bytes = 0;
+	td->stat_io_bytes[0] = td->stat_io_bytes[1] = 0;
+	td->this_io_bytes[0] = td->this_io_bytes[1] = 0;
+
+	if (td->file_map)
+		memset(td->file_map, 0, td->num_maps * sizeof(long));
+}
+
+static void update_rusage_stat(struct thread_data *td)
+{
+	if (!(td->runtime[0] + td->runtime[1]))
+		return;
+
+	getrusage(RUSAGE_SELF, &td->ru_end);
+
+	td->usr_time += mtime_since(&td->ru_start.ru_utime, &td->ru_end.ru_utime);
+	td->sys_time += mtime_since(&td->ru_start.ru_stime, &td->ru_end.ru_stime);
+	td->ctx += td->ru_end.ru_nvcsw + td->ru_end.ru_nivcsw - (td->ru_start.ru_nvcsw + td->ru_start.ru_nivcsw);
+
+	
+	memcpy(&td->ru_start, &td->ru_end, sizeof(td->ru_end));
+}
+
+static void *thread_main(void *data)
+{
+	struct thread_data *td = data;
+	int ret = 1;
+
+	if (!td->use_thread)
+		setsid();
+
+	td->pid = getpid();
+
+	if (init_io_u(td))
+		goto err;
+
+	if (fio_setaffinity(td) == -1) {
+		td_verror(td, errno);
+		goto err;
+	}
+
+	if (init_io(td))
+		goto err;
+
+	if (td->ioprio) {
+		if (ioprio_set(IOPRIO_WHO_PROCESS, 0, td->ioprio) == -1) {
+			td_verror(td, errno);
+			goto err;
+		}
+	}
+
+	sem_post(&startup_sem);
+	sem_wait(&td->mutex);
+
+	if (!td->create_serialize && setup_file(td))
+		goto err;
+
+	if (init_random_state(td))
+		goto err;
+
+	gettimeofday(&td->epoch, NULL);
+
+	while (td->loops--) {
+		getrusage(RUSAGE_SELF, &td->ru_start);
+		gettimeofday(&td->start, NULL);
+		memcpy(&td->stat_sample_time, &td->start, sizeof(td->start));
+
+		if (td->ratemin)
+			memcpy(&td->lastrate, &td->stat_sample_time, sizeof(td->lastrate));
+
+		clear_io_state(td);
+		prune_io_piece_log(td);
+
+		do_io(td);
+
+		td->runtime[td->ddir] += mtime_since_now(&td->start);
+		update_rusage_stat(td);
+
+		if (td->error || td->terminate)
+			break;
+
+		if (td->verify == VERIFY_NONE)
+			continue;
+
+		clear_io_state(td);
+		gettimeofday(&td->start, NULL);
+
+		do_verify(td);
+
+		td->runtime[DDIR_READ] += mtime_since_now(&td->start);
+
+		if (td->error || td->terminate)
+			break;
+	}
+
+	ret = 0;
+
+	if (td->bw_log)
+		finish_log(td, td->bw_log, "bw");
+	if (td->slat_log)
+		finish_log(td, td->slat_log, "slat");
+	if (td->clat_log)
+		finish_log(td, td->clat_log, "clat");
+
+	if (exitall_on_terminate)
+		terminate_threads(td->groupid);
+
+err:
+	if (td->fd != -1) {
+		close(td->fd);
+		td->fd = -1;
+	}
+	if (td->mmap)
+		munmap(td->mmap, td->file_size);
+	cleanup_io(td);
+	cleanup_io_u(td);
+	if (ret) {
+		sem_post(&startup_sem);
+		sem_wait(&td->mutex);
+	}
+	td_set_runstate(td, TD_EXITED);
+	return NULL;
+
+}
+
+static void *fork_main(int shmid, int offset)
+{
+	struct thread_data *td;
+	void *data;
+
+	data = shmat(shmid, NULL, 0);
+	if (data == (void *) -1) {
+		perror("shmat");
+		return NULL;
+	}
+
+	td = data + offset * sizeof(struct thread_data);
+	thread_main(td);
+	shmdt(data);
+	return NULL;
+}
+
+static int calc_lat(struct io_stat *is, unsigned long *min, unsigned long *max,
+		    double *mean, double *dev)
+{
+	double n;
+
+	if (is->samples == 0)
+		return 0;
+
+	*min = is->min_val;
+	*max = is->max_val;
+
+	n = (double) is->samples;
+	*mean = (double) is->val / n;
+	*dev = sqrt(((double) is->val_sq - (*mean * *mean) / n) / (n - 1));
+	if (!(*min + *max) && !(*mean + *dev))
+		return 0;
+
+	return 1;
+}
+
+static void show_ddir_status(struct thread_data *td, struct group_run_stats *rs,
+			     int ddir)
+{
+	char *ddir_str[] = { "read ", "write" };
+	unsigned long min, max, bw;
+	double mean, dev;
+
+	if (!td->runtime[ddir])
+		return;
+
+	bw = td->io_bytes[ddir] / td->runtime[ddir];
+	printf("  %s: io=%6luMiB, bw=%6luKiB/s, runt=%6lumsec\n", ddir_str[ddir], td->io_bytes[ddir] >> 20, bw, td->runtime[ddir]);
+
+	if (calc_lat(&td->slat_stat[ddir], &min, &max, &mean, &dev))
+		printf("    slat (msec): min=%5lu, max=%5lu, avg=%5.02f, dev=%5.02f\n", min, max, mean, dev);
+
+	if (calc_lat(&td->clat_stat[ddir], &min, &max, &mean, &dev))
+		printf("    clat (msec): min=%5lu, max=%5lu, avg=%5.02f, dev=%5.02f\n", min, max, mean, dev);
+
+	if (calc_lat(&td->bw_stat[ddir], &min, &max, &mean, &dev)) {
+		double p_of_agg;
+
+		p_of_agg = mean * 100 / (double) rs->agg[ddir];
+		printf("    bw (KiB/s) : min=%5lu, max=%5lu, per=%3.2f%%, avg=%5.02f, dev=%5.02f\n", min, max, p_of_agg, mean, dev);
+	}
+}
+
+static void show_thread_status(struct thread_data *td,
+			       struct group_run_stats *rs)
+{
+	double usr_cpu, sys_cpu;
+
+	if (!(td->io_bytes[0] + td->io_bytes[1]) && !td->error)
+		return;
+
+	printf("Client%d (groupid=%d): err=%2d:\n", td->thread_number, td->groupid, td->error);
+
+	show_ddir_status(td, rs, td->ddir);
+	show_ddir_status(td, rs, td->ddir ^ 1);
+
+	if (td->runtime[0] + td->runtime[1]) {
+		double runt = td->runtime[0] + td->runtime[1];
+
+		usr_cpu = (double) td->usr_time * 100 / runt;
+		sys_cpu = (double) td->sys_time * 100 / runt;
+	} else {
+		usr_cpu = 0;
+		sys_cpu = 0;
+	}
+
+	printf("  cpu          : usr=%3.2f%%, sys=%3.2f%%, ctx=%lu\n", usr_cpu, sys_cpu, td->ctx);
+}
+
+static void check_str_update(struct thread_data *td)
+{
+	char c = run_str[td->thread_number - 1];
+
+	if (td->runstate == td->old_runstate)
+		return;
+
+	switch (td->runstate) {
+		case TD_REAPED:
+			c = '_';
+			break;
+		case TD_EXITED:
+			c = 'E';
+			break;
+		case TD_RUNNING:
+			if (td_read(td)) {
+				if (td->sequential)
+					c = 'R';
+				else
+					c = 'r';
+			} else {
+				if (td->sequential)
+					c = 'W';
+				else
+					c = 'w';
+			}
+			break;
+		case TD_VERIFYING:
+			c = 'V';
+			break;
+		case TD_CREATED:
+			c = 'C';
+			break;
+		case TD_NOT_CREATED:
+			c = 'P';
+			break;
+		default:
+			printf("state %d\n", td->runstate);
+	}
+
+	run_str[td->thread_number - 1] = c;
+	td->old_runstate = td->runstate;
+}
+
+static void print_thread_status(void)
+{
+	unsigned long long bytes_done, bytes_total;
+	int i, nr_running, t_rate, m_rate;
+	double perc;
+
+	bytes_done = bytes_total = 0;
+	nr_running = t_rate = m_rate = 0;
+	for (i = 0; i < thread_number; i++) {
+		struct thread_data *td = &threads[i];
+
+		if (td->runstate == TD_RUNNING || td->runstate == TD_VERIFYING){
+			nr_running++;
+			t_rate += td->rate;
+			m_rate += td->ratemin;
+		}
+
+		bytes_total += td->total_io_size;
+		if (td->verify)
+			bytes_total += td->total_io_size;
+
+		bytes_done += td->io_bytes[DDIR_READ] +td->io_bytes[DDIR_WRITE];
+
+		check_str_update(td);
+	}
+
+	perc = 0;
+	if (bytes_total && bytes_done) {
+		perc = (double) 100 * bytes_done / (double) bytes_total;
+		if (perc > 100.0)
+			perc = 100.0;
+	}
+
+	printf("Threads now running: %d", nr_running);
+	if (m_rate || t_rate)
+		printf(", commitrate %d/%dKiB/sec", t_rate, m_rate);
+	printf(" : [%s] [%3.2f%% done]\r", run_str, perc);
+	fflush(stdout);
+}
+
+static void reap_threads(int *nr_running, int *t_rate, int *m_rate)
+{
+	int i;
+
+	/*
+	 * reap exited threads (TD_EXITED -> TD_REAPED)
+	 */
+	for (i = 0; i < thread_number; i++) {
+		struct thread_data *td = &threads[i];
+
+		if (td->runstate != TD_EXITED)
+			continue;
+
+		td_set_runstate(td, TD_REAPED);
+
+		if (td->use_thread) {
+			long ret;
+
+			if (pthread_join(td->thread, (void *) &ret))
+				perror("thread_join");
+		} else
+			waitpid(td->pid, NULL, 0);
+
+		(*nr_running)--;
+		(*m_rate) -= td->ratemin;
+		(*t_rate) -= td->rate;
+	}
+}
+
+static void run_threads(void)
+{
+	struct timeval genesis;
+	struct thread_data *td;
+	unsigned long spent;
+	int i, todo, nr_running, m_rate, t_rate, nr_started;
+
+	printf("Starting %d thread%s\n", thread_number, thread_number > 1 ? "s" : "");
+	fflush(stdout);
+
+	signal(SIGINT, sig_handler);
+	signal(SIGALRM, sig_handler);
+
+	todo = thread_number;
+	nr_running = 0;
+	nr_started = 0;
+	m_rate = t_rate = 0;
+
+	for (i = 0; i < thread_number; i++) {
+		td = &threads[i];
+
+		run_str[td->thread_number - 1] = 'P';
+
+		init_disk_util(td);
+
+		if (!td->create_serialize)
+			continue;
+
+		/*
+		 * do file setup here so it happens sequentially,
+		 * we don't want X number of threads getting their
+		 * client data interspersed on disk
+		 */
+		if (setup_file(td)) {
+			td_set_runstate(td, TD_REAPED);
+			todo--;
+		}
+	}
+
+	gettimeofday(&genesis, NULL);
+
+	while (todo) {
+		/*
+		 * create threads (TD_NOT_CREATED -> TD_CREATED)
+		 */
+		for (i = 0; i < thread_number; i++) {
+			td = &threads[i];
+
+			if (td->runstate != TD_NOT_CREATED)
+				continue;
+
+			/*
+			 * never got a chance to start, killed by other
+			 * thread for some reason
+			 */
+			if (td->terminate) {
+				todo--;
+				continue;
+			}
+
+			if (td->start_delay) {
+				spent = mtime_since_now(&genesis);
+
+				if (td->start_delay * 1000 > spent)
+					continue;
+			}
+
+			if (td->stonewall && (nr_started || nr_running))
+				break;
+
+			td_set_runstate(td, TD_CREATED);
+			sem_init(&startup_sem, 0, 1);
+			todo--;
+			nr_started++;
+
+			if (td->use_thread) {
+				if (pthread_create(&td->thread, NULL, thread_main, td)) {
+					perror("thread_create");
+					nr_started--;
+				}
+			} else {
+				if (fork())
+					sem_wait(&startup_sem);
+				else {
+					fork_main(shm_id, i);
+					exit(0);
+				}
+			}
+		}
+
+		/*
+		 * start created threads (TD_CREATED -> TD_RUNNING)
+		 */
+		for (i = 0; i < thread_number; i++) {
+			td = &threads[i];
+
+			if (td->runstate != TD_CREATED)
+				continue;
+
+			td_set_runstate(td, TD_RUNNING);
+			nr_running++;
+			nr_started--;
+			m_rate += td->ratemin;
+			t_rate += td->rate;
+			sem_post(&td->mutex);
+		}
+
+		reap_threads(&nr_running, &t_rate, &m_rate);
+
+		if (todo)
+			usleep(100000);
+	}
+
+	while (nr_running) {
+		reap_threads(&nr_running, &t_rate, &m_rate);
+		usleep(10000);
+	}
+
+	update_io_ticks();
+}
+
+static void show_group_stats(struct group_run_stats *rs, int id)
+{
+	printf("\nRun status group %d (all jobs):\n", id);
+
+	if (rs->max_run[DDIR_READ])
+		printf("   READ: io=%luMiB, aggrb=%lu, minb=%lu, maxb=%lu, mint=%lumsec, maxt=%lumsec\n", rs->io_mb[0], rs->agg[0], rs->min_bw[0], rs->max_bw[0], rs->min_run[0], rs->max_run[0]);
+	if (rs->max_run[DDIR_WRITE])
+		printf("  WRITE: io=%luMiB, aggrb=%lu, minb=%lu, maxb=%lu, mint=%lumsec, maxt=%lumsec\n", rs->io_mb[1], rs->agg[1], rs->min_bw[1], rs->max_bw[1], rs->min_run[1], rs->max_run[1]);
+}
+
+static void show_disk_util(void)
+{
+	struct disk_util_stat *dus;
+	struct list_head *entry;
+	struct disk_util *du;
+	double util;
+
+	printf("\nDisk stats (read/write):\n");
+
+	list_for_each(entry, &disk_list) {
+		du = list_entry(entry, struct disk_util, list);
+		dus = &du->dus;
+
+		util = (double) 100 * du->dus.io_ticks / (double) du->msec;
+		if (util > 100.0)
+			util = 100.0;
+
+		printf("  %s: ios=%u/%u, merge=%u/%u, ticks=%u/%u, in_queue=%u, util=%3.2f%%\n", du->name, dus->ios[0], dus->ios[1], dus->merges[0], dus->merges[1], dus->ticks[0], dus->ticks[1], dus->time_in_queue, util);
+	}
+}
+
+static void show_run_stats(void)
+{
+	struct group_run_stats *runstats, *rs;
+	struct thread_data *td;
+	int i;
+
+	runstats = malloc(sizeof(struct group_run_stats) * (groupid + 1));
+
+	for (i = 0; i < groupid + 1; i++) {
+		rs = &runstats[i];
+
+		memset(rs, 0, sizeof(*rs));
+		rs->min_bw[0] = rs->min_run[0] = ~0UL;
+		rs->min_bw[1] = rs->min_run[1] = ~0UL;
+	}
+
+	for (i = 0; i < thread_number; i++) {
+		unsigned long rbw, wbw;
+
+		td = &threads[i];
+
+		if (td->error) {
+			printf("Client%d: %s\n", td->thread_number, td->verror);
+			continue;
+		}
+
+		rs = &runstats[td->groupid];
+
+		if (td->runtime[0] < rs->min_run[0] || !rs->min_run[0])
+			rs->min_run[0] = td->runtime[0];
+		if (td->runtime[0] > rs->max_run[0])
+			rs->max_run[0] = td->runtime[0];
+		if (td->runtime[1] < rs->min_run[1] || !rs->min_run[1])
+			rs->min_run[1] = td->runtime[1];
+		if (td->runtime[1] > rs->max_run[1])
+			rs->max_run[1] = td->runtime[1];
+
+		rbw = wbw = 0;
+		if (td->runtime[0])
+			rbw = td->io_bytes[0] / td->runtime[0];
+		if (td->runtime[1])
+			wbw = td->io_bytes[1] / td->runtime[1];
+
+		if (rbw < rs->min_bw[0])
+			rs->min_bw[0] = rbw;
+		if (wbw < rs->min_bw[1])
+			rs->min_bw[1] = wbw;
+		if (rbw > rs->max_bw[0])
+			rs->max_bw[0] = rbw;
+		if (wbw > rs->max_bw[1])
+			rs->max_bw[1] = wbw;
+
+		rs->io_mb[0] += td->io_bytes[0] >> 20;
+		rs->io_mb[1] += td->io_bytes[1] >> 20;
+	}
+
+	for (i = 0; i < groupid + 1; i++) {
+		rs = &runstats[i];
+
+		if (rs->max_run[0])
+			rs->agg[0] = (rs->io_mb[0]*1024*1000) / rs->max_run[0];
+		if (rs->max_run[1])
+			rs->agg[1] = (rs->io_mb[1]*1024*1000) / rs->max_run[1];
+	}
+
+	/*
+	 * don't overwrite last signal output
+	 */
+	printf("\n");
+
+	for (i = 0; i < thread_number; i++) {
+		td = &threads[i];
+		rs = &runstats[td->groupid];
+
+		show_thread_status(td, rs);
+	}
+
+	for (i = 0; i < groupid + 1; i++)
+		show_group_stats(&runstats[i], i);
+
+	show_disk_util();
+}
+
+int main(int argc, char *argv[])
+{
+	if (parse_options(argc, argv))
+		return 1;
+
+	if (!thread_number) {
+		printf("Nothing to do\n");
+		return 1;
+	}
+
+	disk_util_timer_arm();
+
+	run_threads();
+	show_run_stats();
+
+	return 0;
+}