init.c

/*
 * This file contains job initialization and setup functions.
 */
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <fcntl.h>
#include <ctype.h>
#include <string.h>
#include <errno.h>
#include <sys/ipc.h>
#include <sys/shm.h>
#include <sys/types.h>
#include <sys/stat.h>

#include "fio.h"
#include "parse.h"

/*
 * The default options
 */
#define DEF_BS			(4096)
#define DEF_TIMEOUT		(0)
#define DEF_RATE_CYCLE		(1000)
#define DEF_ODIRECT		(1)
#define DEF_IO_ENGINE		(FIO_SYNCIO)
#define DEF_IO_ENGINE_NAME	"sync"
#define DEF_SEQUENTIAL		(1)
#define DEF_RAND_REPEAT		(1)
#define DEF_OVERWRITE		(1)
#define DEF_INVALIDATE		(1)
#define DEF_SYNCIO		(0)
#define DEF_RANDSEED		(0xb1899bedUL)
#define DEF_BWAVGTIME		(500)
#define DEF_CREATE_SER		(1)
#define DEF_CREATE_FSYNC	(1)
#define DEF_LOOPS		(1)
#define DEF_VERIFY		(0)
#define DEF_STONEWALL		(0)
#define DEF_NUMJOBS		(1)
#define DEF_USE_THREAD		(0)
#define DEF_FILE_SIZE		(1024 * 1024 * 1024UL)
#define DEF_ZONE_SIZE		(0)
#define DEF_ZONE_SKIP		(0)
#define DEF_RWMIX_CYCLE		(500)
#define DEF_RWMIX_READ		(50)
#define DEF_NICE		(0)
#define DEF_NR_FILES		(1)
#define DEF_UNLINK		(0)
#define DEF_WRITE_BW_LOG	(0)
#define DEF_WRITE_LAT_LOG	(0)

#define td_var_offset(var)	((size_t) &((struct thread_data *)0)->var)

static int str_rw_cb(void *, char *);
static int str_ioengine_cb(void *, char *);
static int str_mem_cb(void *, char *);
static int str_verify_cb(void *, char *);
static int str_lockmem_cb(void *, unsigned long *);
static int str_prio_cb(void *, unsigned int *);
static int str_prioclass_cb(void *, unsigned int *);
static int str_exitall_cb(void);
static int str_cpumask_cb(void *, unsigned int *);

/*
 * Map of job/command line options
 */
static struct fio_option options[] = {
	{
		.name	= "name",
		.type	= FIO_OPT_STR_STORE,
		.off1	= td_var_offset(name),
	},
	{
		.name	= "directory",
		.type	= FIO_OPT_STR_STORE,
		.off1	= td_var_offset(directory),
	},
	{
		.name	= "filename",
		.type	= FIO_OPT_STR_STORE,
		.off1	= td_var_offset(filename),
	},
	{
		.name	= "rw",
		.type	= FIO_OPT_STR,
		.cb	= str_rw_cb,
	},
	{
		.name	= "ioengine",
		.type	= FIO_OPT_STR,
		.cb	= str_ioengine_cb,
	},
	{
		.name	= "mem",
		.type	= FIO_OPT_STR,
		.cb	= str_mem_cb,
	},
	{
		.name	= "verify",
		.type	= FIO_OPT_STR,
		.cb	= str_verify_cb,
	},
	{
		.name	= "write_iolog",
		.type	= FIO_OPT_STR_STORE,
		.off1	= td_var_offset(write_iolog),
	},
	{
		.name	= "iolog",
		.type	= FIO_OPT_STR_STORE,
		.off1	= td_var_offset(iolog),
	},
	{
		.name	= "exec_prerun",
		.type	= FIO_OPT_STR_STORE,
		.off1	= td_var_offset(exec_prerun),
	},
	{
		.name	= "exec_postrun",
		.type	= FIO_OPT_STR_STORE,
		.off1	= td_var_offset(exec_postrun),
	},
#ifdef FIO_HAVE_IOSCHED_SWITCH
	{
		.name	= "ioscheduler",
		.type	= FIO_OPT_STR_STORE,
		.off1	= td_var_offset(ioscheduler),
	},
#endif
	{
		.name	= "size",
		.type	= FIO_OPT_STR_VAL,
		.off1	= td_var_offset(total_file_size),
	},
	{
		.name	= "bs",
		.type	= FIO_OPT_STR_VAL,
		.off1	= td_var_offset(bs),
	},
	{
		.name	= "offset",
		.type	= FIO_OPT_STR_VAL,
		.off1	= td_var_offset(start_offset),
	},
	{
		.name	= "zonesize",
		.type	= FIO_OPT_STR_VAL,
		.off1	= td_var_offset(zone_size),
	},
	{
		.name	= "zoneskip",
		.type	= FIO_OPT_STR_VAL,
		.off1	= td_var_offset(zone_skip),
	},
	{
		.name	= "lockmem",
		.type	= FIO_OPT_STR_VAL,
		.cb	= str_lockmem_cb,
	},
	{
		.name	= "bsrange",
		.type	= FIO_OPT_RANGE,
		.off1	= td_var_offset(min_bs),
		.off2	= td_var_offset(max_bs),
	},
	{
		.name	= "nrfiles",
		.type	= FIO_OPT_INT,
		.off1	= td_var_offset(nr_files),
	},
	{
		.name	= "iodepth",
		.type	= FIO_OPT_INT,
		.off1	= td_var_offset(iodepth),
	},
	{
		.name	= "fsync",
		.type	= FIO_OPT_INT,
		.off1	= td_var_offset(fsync_blocks),
	},
	{
		.name	= "rwmixcycle",
		.type	= FIO_OPT_INT,
		.off1	= td_var_offset(rwmixcycle),
	},
	{
		.name	= "rwmixread",
		.type	= FIO_OPT_INT,
		.off1	= td_var_offset(rwmixread),
		.max_val= 100,
	},
	{
		.name	= "rwmixwrite",
		.type	= FIO_OPT_INT,
		.off1	= td_var_offset(rwmixwrite),
		.max_val= 100,
	},
	{
		.name	= "nice",
		.type	= FIO_OPT_INT,
		.off1	= td_var_offset(nice),
	},
#ifdef FIO_HAVE_IOPRIO
	{
		.name	= "prio",
		.type	= FIO_OPT_INT,
		.cb	= str_prio_cb,
	},
	{
		.name	= "prioclass",
		.type	= FIO_OPT_INT,
		.cb	= str_prioclass_cb,
	},
#endif
	{
		.name	= "thinktime",
		.type	= FIO_OPT_INT,
		.off1	= td_var_offset(thinktime)
	},
	{
		.name	= "rate",
		.type	= FIO_OPT_INT,
		.off1	= td_var_offset(rate)
	},
	{
		.name	= "ratemin",
		.type	= FIO_OPT_INT,
		.off1	= td_var_offset(ratemin)
	},
	{
		.name	= "ratecycle",
		.type	= FIO_OPT_INT,
		.off1	= td_var_offset(ratecycle)
	},
	{
		.name	= "startdelay",
		.type	= FIO_OPT_INT,
		.off1	= td_var_offset(start_delay)
	},
	{
		.name	= "timeout",
		.type	= FIO_OPT_STR_VAL_TIME,
		.off1	= td_var_offset(timeout)
	},
	{
		.name	= "invalidate",
		.type	= FIO_OPT_INT,
		.off1	= td_var_offset(invalidate_cache)
	},
	{
		.name	= "sync",
		.type	= FIO_OPT_INT,
		.off1	= td_var_offset(sync_io)
	},
	{
		.name	= "bwavgtime",
		.type	= FIO_OPT_INT,
		.off1	= td_var_offset(bw_avg_time)
	},
	{
		.name	= "create_serialize",
		.type	= FIO_OPT_INT,
		.off1	= td_var_offset(create_serialize)
	},
	{
		.name	= "create_fsync",
		.type	= FIO_OPT_INT,
		.off1	= td_var_offset(create_fsync)
	},
	{
		.name	= "loops",
		.type	= FIO_OPT_INT,
		.off1	= td_var_offset(loops)
	},
	{
		.name	= "numjobs",
		.type	= FIO_OPT_INT,
		.off1	= td_var_offset(numjobs)
	},
	{
		.name	= "cpuload",
		.type	= FIO_OPT_INT,
		.off1	= td_var_offset(cpuload)
	},
	{
		.name	= "cpuchunks",
		.type	= FIO_OPT_INT,
		.off1	= td_var_offset(cpucycle)
	},
	{
		.name	= "direct",
		.type	= FIO_OPT_INT,
		.off1	= td_var_offset(odirect)
	},
	{
		.name	= "overwrite",
		.type	= FIO_OPT_INT,
		.off1	= td_var_offset(overwrite)
	},
#ifdef FIO_HAVE_CPU_AFFINITY
	{
		.name	= "cpumask",
		.type	= FIO_OPT_INT,
		.cb	= str_cpumask_cb,
	},
#endif
	{
		.name	= "end_fsync",
		.type	= FIO_OPT_INT,
		.off1	= td_var_offset(end_fsync)
	},
	{
		.name	= "unlink",
		.type	= FIO_OPT_STR_SET,
		.off1	= td_var_offset(unlink),
	},
	{
		.name	= "exitall",
		.type	= FIO_OPT_STR_SET,
		.cb	= str_exitall_cb,
	},
	{
		.name	= "stonewall",
		.type	= FIO_OPT_STR_SET,
		.off1	= td_var_offset(stonewall),
	},
	{
		.name	= "thread",
		.type	= FIO_OPT_STR_SET,
		.off1	= td_var_offset(thread),
	},
	{
		.name	= "write_bw_log",
		.type	= FIO_OPT_STR_SET,
		.off1	= td_var_offset(write_bw_log),
	},
	{
		.name	= "write_lat_log",
		.type	= FIO_OPT_STR_SET,
		.off1	= td_var_offset(write_lat_log),
	},
	{
		.name = NULL,
	},
};

static int def_timeout = DEF_TIMEOUT;

static char fio_version_string[] = "fio 1.5";

static char **ini_file;
static int max_jobs = MAX_JOBS;

struct thread_data def_thread;
struct thread_data *threads = NULL;

int rate_quit = 0;
int exitall_on_terminate = 0;
int terse_output = 0;
unsigned long long mlock_size = 0;
FILE *f_out = NULL;
FILE *f_err = NULL;

static int write_lat_log = DEF_WRITE_LAT_LOG;
static int write_bw_log = DEF_WRITE_BW_LOG;

/*
 * Return a free job structure.
 */
static struct thread_data *get_new_job(int global, struct thread_data *parent)
{
	struct thread_data *td;

	if (global)
		return &def_thread;
	if (thread_number >= max_jobs)
		return NULL;

	td = &threads[thread_number++];
	*td = *parent;
	td->name[0] = '\0';

	td->thread_number = thread_number;
	return td;
}

static void put_job(struct thread_data *td)
{
	memset(&threads[td->thread_number - 1], 0, sizeof(*td));
	thread_number--;
}

static void fixup_options(struct thread_data *td)
{
	if (!td->min_bs)
		td->min_bs = td->bs;
	if (!td->max_bs)
		td->max_bs = td->bs;

	if (!td->rwmixread && td->rwmixwrite)
		td->rwmixread = 100 - td->rwmixwrite;
}

/*
 * Adds a job to the list of things todo. Sanitizes the various options
 * to make sure we don't have conflicts, and initializes various
 * members of td.
 */
static int add_job(struct thread_data *td, const char *jobname, int job_add_num)
{
	char *ddir_str[] = { "read", "write", "randread", "randwrite",
			     "rw", NULL, "randrw" };
	struct stat sb;
	int numjobs, ddir, i;
	struct fio_file *f;

#ifndef FIO_HAVE_LIBAIO
	if (td->io_engine == FIO_LIBAIO) {
		log_err("Linux libaio not available\n");
		return 1;
	}
#endif
#ifndef FIO_HAVE_POSIXAIO
	if (td->io_engine == FIO_POSIXAIO) {
		log_err("posix aio not available\n");
		return 1;
	}
#endif

	fixup_options(td);

	/*
	 * the def_thread is just for options, it's not a real job
	 */
	if (td == &def_thread)
		return 0;

	/*
	 * Set default io engine, if none set
	 */
	if (!td->io_ops) {
		td->io_ops = load_ioengine(td, DEF_IO_ENGINE_NAME);
		if (!td->io_ops) {
			log_err("default engine %s not there?\n", DEF_IO_ENGINE_NAME);
			return 1;
		}
	}

	if (td->io_ops->flags & FIO_SYNCIO)
		td->iodepth = 1;
	else {
		if (!td->iodepth)
			td->iodepth = td->nr_files;
	}

	/*
	 * only really works for sequential io for now, and with 1 file
	 */
	if (td->zone_size && !td->sequential && td->nr_files == 1)
		td->zone_size = 0;

	/*
	 * Reads can do overwrites, we always need to pre-create the file
	 */
	if (td_read(td) || td_rw(td))
		td->overwrite = 1;

	td->filetype = FIO_TYPE_FILE;
	if (!stat(jobname, &sb)) {
		if (S_ISBLK(sb.st_mode))
			td->filetype = FIO_TYPE_BD;
		else if (S_ISCHR(sb.st_mode))
			td->filetype = FIO_TYPE_CHAR;
	}

	if (td->odirect)
		td->io_ops->flags |= FIO_RAWIO;

	if (td->filename)
		td->nr_uniq_files = 1;
	else
		td->nr_uniq_files = td->nr_files;

	if (td->filetype == FIO_TYPE_FILE || td->filename) {
		char tmp[PATH_MAX];
		int len = 0;
		int i;

		if (td->directory && td->directory[0] != '\0')
			sprintf(tmp, "%s/", td->directory);

		td->files = malloc(sizeof(struct fio_file) * td->nr_files);

		for_each_file(td, f, i) {
			memset(f, 0, sizeof(*f));
			f->fd = -1;

			if (td->filename)
				sprintf(tmp + len, "%s", td->filename);
			else
				sprintf(tmp + len, "%s.%d.%d", jobname, td->thread_number, i);
			f->file_name = strdup(tmp);
		}
	} else {
		td->nr_files = 1;
		td->files = malloc(sizeof(struct fio_file));
		f = &td->files[0];

		memset(f, 0, sizeof(*f));
		f->fd = -1;
		f->file_name = strdup(jobname);
	}

	for_each_file(td, f, i) {
		f->file_size = td->total_file_size / td->nr_files;
		f->file_offset = td->start_offset;
	}
		
	fio_sem_init(&td->mutex, 0);

	td->clat_stat[0].min_val = td->clat_stat[1].min_val = ULONG_MAX;
	td->slat_stat[0].min_val = td->slat_stat[1].min_val = ULONG_MAX;
	td->bw_stat[0].min_val = td->bw_stat[1].min_val = ULONG_MAX;

	if (td->min_bs == -1U)
		td->min_bs = td->bs;
	if (td->max_bs == -1U)
		td->max_bs = td->bs;
	if (td_read(td) && !td_rw(td))
		td->verify = 0;

	if (td->stonewall && td->thread_number > 1)
		groupid++;

	td->groupid = groupid;

	if (setup_rate(td))
		goto err;

	if (td->write_lat_log) {
		setup_log(&td->slat_log);
		setup_log(&td->clat_log);
	}
	if (td->write_bw_log)
		setup_log(&td->bw_log);

	if (td->name[0] == '\0')
		snprintf(td->name, sizeof(td->name)-1, "client%d", td->thread_number);

	ddir = td->ddir + (!td->sequential << 1) + (td->iomix << 2);

	if (!terse_output) {
		if (!job_add_num) {
			if (td->io_ops->flags & FIO_CPUIO)
				fprintf(f_out, "%s: ioengine=cpu, cpuload=%u, cpucycle=%u\n", td->name, td->cpuload, td->cpucycle);
			else
				fprintf(f_out, "%s: (g=%d): rw=%s, odir=%d, bs=%d-%d, rate=%d, ioengine=%s, iodepth=%d\n", td->name, td->groupid, ddir_str[ddir], td->odirect, td->min_bs, td->max_bs, td->rate, td->io_ops->name, td->iodepth);
		} else if (job_add_num == 1)
			fprintf(f_out, "...\n");
	}

	/*
	 * recurse add identical jobs, clear numjobs and stonewall options
	 * as they don't apply to sub-jobs
	 */
	numjobs = td->numjobs;
	while (--numjobs) {
		struct thread_data *td_new = get_new_job(0, td);

		if (!td_new)
			goto err;

		td_new->numjobs = 1;
		td_new->stonewall = 0;
		job_add_num = numjobs - 1;

		if (add_job(td_new, jobname, job_add_num))
			goto err;
	}
	return 0;
err:
	put_job(td);
	return -1;
}

/*
 * Initialize the various random states we need (random io, block size ranges,
 * read/write mix, etc).
 */
int init_random_state(struct thread_data *td)
{
	unsigned long seeds[4];
	int fd, num_maps, blocks, i;
	struct fio_file *f;

	fd = open("/dev/urandom", O_RDONLY);
	if (fd == -1) {
		td_verror(td, errno);
		return 1;
	}

	if (read(fd, seeds, sizeof(seeds)) < (int) sizeof(seeds)) {
		td_verror(td, EIO);
		close(fd);
		return 1;
	}

	close(fd);

	os_random_seed(seeds[0], &td->bsrange_state);
	os_random_seed(seeds[1], &td->verify_state);
	os_random_seed(seeds[2], &td->rwmix_state);

	if (td->sequential)
		return 0;

	if (td->rand_repeatable)
		seeds[3] = DEF_RANDSEED;

	for_each_file(td, f, i) {
		blocks = (f->file_size + td->min_bs - 1) / td->min_bs;
		num_maps = blocks / BLOCKS_PER_MAP;
		f->file_map = malloc(num_maps * sizeof(long));
		f->num_maps = num_maps;
		memset(f->file_map, 0, num_maps * sizeof(long));
	}

	os_random_seed(seeds[3], &td->random_state);
	return 0;
}

static void fill_cpu_mask(os_cpu_mask_t cpumask, int cpu)
{
#ifdef FIO_HAVE_CPU_AFFINITY
	unsigned int i;

	CPU_ZERO(&cpumask);

	for (i = 0; i < sizeof(int) * 8; i++) {
		if ((1 << i) & cpu)
			CPU_SET(i, &cpumask);
	}
#endif
}

static int is_empty_or_comment(char *line)
{
	unsigned int i;

	for (i = 0; i < strlen(line); i++) {
		if (line[i] == ';')
			return 1;
		if (!isspace(line[i]) && !iscntrl(line[i]))
			return 0;
	}

	return 1;
}

static int str_rw_cb(void *data, char *mem)
{
	struct thread_data *td = data;

	if (!strncmp(mem, "read", 4) || !strncmp(mem, "0", 1)) {
		td->ddir = DDIR_READ;
		td->sequential = 1;
		return 0;
	} else if (!strncmp(mem, "randread", 8)) {
		td->ddir = DDIR_READ;
		td->sequential = 0;
		return 0;
	} else if (!strncmp(mem, "write", 5) || !strncmp(mem, "1", 1)) {
		td->ddir = DDIR_WRITE;
		td->sequential = 1;
		return 0;
	} else if (!strncmp(mem, "randwrite", 9)) {
		td->ddir = DDIR_WRITE;
		td->sequential = 0;
		return 0;
	} else if (!strncmp(mem, "rw", 2)) {
		td->ddir = 0;
		td->iomix = 1;
		td->sequential = 1;
		return 0;
	} else if (!strncmp(mem, "randrw", 6)) {
		td->ddir = 0;
		td->iomix = 1;
		td->sequential = 0;
		return 0;
	}

	log_err("fio: data direction: read, write, randread, randwrite, rw, randrw\n");
	return 1;
}

static int str_verify_cb(void *data, char *mem)
{
	struct thread_data *td = data;

	if (!strncmp(mem, "0", 1)) {
		td->verify = VERIFY_NONE;
		return 0;
	} else if (!strncmp(mem, "md5", 3) || !strncmp(mem, "1", 1)) {
		td->verify = VERIFY_MD5;
		return 0;
	} else if (!strncmp(mem, "crc32", 5)) {
		td->verify = VERIFY_CRC32;
		return 0;
	}

	log_err("fio: verify types: md5, crc32\n");
	return 1;
}

static int str_mem_cb(void *data, char *mem)
{
	struct thread_data *td = data;

	if (!strncmp(mem, "malloc", 6)) {
		td->mem_type = MEM_MALLOC;
		return 0;
	} else if (!strncmp(mem, "shm", 3)) {
		td->mem_type = MEM_SHM;
		return 0;
	} else if (!strncmp(mem, "mmap", 4)) {
		td->mem_type = MEM_MMAP;
		return 0;
	}

	log_err("fio: mem type: malloc, shm, mmap\n");
	return 1;
}

static int str_ioengine_cb(void *data, char *str)
{
	struct thread_data *td = data;

	td->io_ops = load_ioengine(td, str);
	if (td->io_ops)
		return 0;

	log_err("fio: ioengine: { linuxaio, aio, libaio }, posixaio, sync, mmap, sgio, splice, cpu\n");
	return 1;
}

static int str_lockmem_cb(void fio_unused *data, unsigned long *val)
{
	mlock_size = *val;
	return 0;
}

static int str_prioclass_cb(void *data, unsigned int *val)
{
	struct thread_data *td = data;

	td->ioprio |= *val << IOPRIO_CLASS_SHIFT;
	return 0;
}

static int str_prio_cb(void *data, unsigned int *val)
{
	struct thread_data *td = data;

	td->ioprio |= *val;
	return 0;
}

static int str_exitall_cb(void)
{
	exitall_on_terminate = 1;
	return 0;
}

static int str_cpumask_cb(void *data, unsigned int *val)
{
	struct thread_data *td = data;

	fill_cpu_mask(td->cpumask, *val);
	return 0;
}

/*
 * This is our [ini] type file parser.
 */
int parse_jobs_ini(char *file, int stonewall_flag)
{
	unsigned int global;
	struct thread_data *td;
	char *string, *name, *tmpbuf;
	fpos_t off;
	FILE *f;
	char *p;
	int ret = 0, stonewall;

	f = fopen(file, "r");
	if (!f) {
		perror("fopen job file");
		return 1;
	}

	string = malloc(4096);
	name = malloc(256);
	tmpbuf = malloc(4096);

	stonewall = stonewall_flag;
	while ((p = fgets(string, 4096, f)) != NULL) {
		if (ret)
			break;
		if (is_empty_or_comment(p))
			continue;
		if (sscanf(p, "[%s]", name) != 1)
			continue;

		global = !strncmp(name, "global", 6);

		name[strlen(name) - 1] = '\0';

		td = get_new_job(global, &def_thread);
		if (!td) {
			ret = 1;
			break;
		}

		/*
		 * Seperate multiple job files by a stonewall
		 */
		if (!global && stonewall) {
			td->stonewall = stonewall;
			stonewall = 0;
		}

		fgetpos(f, &off);
		while ((p = fgets(string, 4096, f)) != NULL) {
			if (is_empty_or_comment(p))
				continue;
			if (strstr(p, "["))
				break;

			strip_blank_front(&p);
			strip_blank_end(p);

			fgetpos(f, &off);

			/*
			 * Don't break here, continue parsing options so we
			 * dump all the bad ones. Makes trial/error fixups
			 * easier on the user.
			 */
			ret = parse_option(p, options, td);
		}

		if (!ret) {
			fsetpos(f, &off);
			ret = add_job(td, name, 0);
		}
		if (ret)
			break;
	}

	free(string);
	free(name);
	free(tmpbuf);
	fclose(f);
	return ret;
}

static int fill_def_thread(void)
{
	memset(&def_thread, 0, sizeof(def_thread));

	if (fio_getaffinity(getpid(), &def_thread.cpumask) == -1) {
		perror("sched_getaffinity");
		return 1;
	}

	/*
	 * fill globals
	 */
	def_thread.ddir = DDIR_READ;
	def_thread.iomix = 0;
	def_thread.bs = DEF_BS;
	def_thread.min_bs = -1;
	def_thread.max_bs = -1;
	def_thread.odirect = DEF_ODIRECT;
	def_thread.ratecycle = DEF_RATE_CYCLE;
	def_thread.sequential = DEF_SEQUENTIAL;
	def_thread.timeout = def_timeout;
	def_thread.overwrite = DEF_OVERWRITE;
	def_thread.invalidate_cache = DEF_INVALIDATE;
	def_thread.sync_io = DEF_SYNCIO;
	def_thread.mem_type = MEM_MALLOC;
	def_thread.bw_avg_time = DEF_BWAVGTIME;
	def_thread.create_serialize = DEF_CREATE_SER;
	def_thread.create_fsync = DEF_CREATE_FSYNC;
	def_thread.loops = DEF_LOOPS;
	def_thread.verify = DEF_VERIFY;
	def_thread.stonewall = DEF_STONEWALL;
	def_thread.numjobs = DEF_NUMJOBS;
	def_thread.use_thread = DEF_USE_THREAD;
	def_thread.rwmixcycle = DEF_RWMIX_CYCLE;
	def_thread.rwmixread = DEF_RWMIX_READ;
	def_thread.nice = DEF_NICE;
	def_thread.rand_repeatable = DEF_RAND_REPEAT;
	def_thread.nr_files = DEF_NR_FILES;
	def_thread.unlink = DEF_UNLINK;
	def_thread.write_bw_log = write_bw_log;
	def_thread.write_lat_log = write_lat_log;
#ifdef FIO_HAVE_DISK_UTIL
	def_thread.do_disk_util = 1;
#endif

	return 0;
}

static void usage(void)
{
	printf("%s\n", fio_version_string);
	printf("\t-o Write output to file\n");
	printf("\t-t Runtime in seconds\n");
	printf("\t-l Generate per-job latency logs\n");
	printf("\t-w Generate per-job bandwidth logs\n");
	printf("\t-m Minimal (terse) output\n");
	printf("\t-v Print version info and exit\n");
}

static int parse_cmd_line(int argc, char *argv[])
{
	int c, idx = 1, ini_idx = 0;

	while ((c = getopt(argc, argv, "t:o:lwvhm")) != EOF) {
		switch (c) {
			case 't':
				def_timeout = atoi(optarg);
				idx = optind;
				break;
			case 'l':
				write_lat_log = 1;
				idx = optind;
				break;
			case 'w':
				write_bw_log = 1;
				idx = optind;
				break;
			case 'o':
				f_out = fopen(optarg, "w+");
				if (!f_out) {
					perror("fopen output");
					exit(1);
				}
				f_err = f_out;
				idx = optind;
				break;
			case 'm':
				terse_output = 1;
				idx = optind;
				break;
			case 'h':
				usage();
				exit(0);
			case 'v':
				printf("%s\n", fio_version_string);
				exit(0);
		}
	}

	while (idx < argc) {
		ini_idx++;
		ini_file = realloc(ini_file, ini_idx * sizeof(char *));
		ini_file[ini_idx - 1] = strdup(argv[idx]);
		idx++;
	}

	if (!f_out) {
		f_out = stdout;
		f_err = stderr;
	}

	return ini_idx;
}

static void free_shm(void)
{
	struct shmid_ds sbuf;

	if (threads) {
		shmdt((void *) threads);
		threads = NULL;
		shmctl(shm_id, IPC_RMID, &sbuf);
	}
}

/*
 * The thread area is shared between the main process and the job
 * threads/processes. So setup a shared memory segment that will hold
 * all the job info.
 */
static int setup_thread_area(void)
{
	/*
	 * 1024 is too much on some machines, scale max_jobs if
	 * we get a failure that looks like too large a shm segment
	 */
	do {
		size_t size = max_jobs * sizeof(struct thread_data);

		shm_id = shmget(0, size, IPC_CREAT | 0600);
		if (shm_id != -1)
			break;
		if (errno != EINVAL) {
			perror("shmget");
			break;
		}

		max_jobs >>= 1;
	} while (max_jobs);

	if (shm_id == -1)
		return 1;

	threads = shmat(shm_id, NULL, 0);
	if (threads == (void *) -1) {
		perror("shmat");
		return 1;
	}

	atexit(free_shm);
	return 0;
}

int parse_options(int argc, char *argv[])
{
	int job_files, i;

	if (setup_thread_area())
		return 1;
	if (fill_def_thread())
		return 1;

	job_files = parse_cmd_line(argc, argv);
	if (!job_files) {
		log_err("Need job file(s)\n");
		usage();
		return 1;
	}

	for (i = 0; i < job_files; i++) {
		if (fill_def_thread())
			return 1;
		if (parse_jobs_ini(ini_file[i], i))
			return 1;
		free(ini_file[i]);
	}

	free(ini_file);
	return 0;
}