stat.c - fp2-dev/platform/external/fio - Gitiles

 #include <stdio.h>
 #include <string.h>
 #include <sys/time.h>
 #include <sys/types.h>
 #include <sys/stat.h>
 #include <dirent.h>
 #include <libgen.h>
 #include <math.h>

 #include "fio.h"
 #include "diskutil.h"

 void update_rusage_stat(struct thread_data *td)
 {
 	struct thread_stat *ts = &td->ts;

 	getrusage(RUSAGE_SELF, &ts->ru_end);

 	ts->usr_time += mtime_since(&ts->ru_start.ru_utime,
 					&ts->ru_end.ru_utime);
 	ts->sys_time += mtime_since(&ts->ru_start.ru_stime,
 					&ts->ru_end.ru_stime);
 	ts->ctx += ts->ru_end.ru_nvcsw + ts->ru_end.ru_nivcsw
 			- (ts->ru_start.ru_nvcsw + ts->ru_start.ru_nivcsw);
 	ts->minf += ts->ru_end.ru_minflt - ts->ru_start.ru_minflt;
 	ts->majf += ts->ru_end.ru_majflt - ts->ru_start.ru_majflt;

 	memcpy(&ts->ru_start, &ts->ru_end, sizeof(ts->ru_end));
 }

 static int calc_lat(struct io_stat *is, unsigned long *min, unsigned long *max,
 		    double *mean, double *dev)
 {
 	double n = is->samples;

 	if (is->samples == 0)
 		return 0;

 	*min = is->min_val;
 	*max = is->max_val;

 	n = (double) is->samples;
 	*mean = is->mean;

 	if (n > 1.0)
 		*dev = sqrt(is->S / (n - 1.0));
 	else
 		*dev = 0;

 	return 1;
 }

 static void show_group_stats(struct group_run_stats *rs, int id)
 {
 	char *p1, *p2, *p3, *p4;
 	const char *ddir_str[] = { "   READ", "  WRITE" };
 	int i;

 	log_info("\nRun status group %d (all jobs):\n", id);

 	for (i = 0; i <= DDIR_WRITE; i++) {
 		const int i2p = is_power_of_2(rs->kb_base);

 		if (!rs->max_run[i])
 			continue;

 		p1 = num2str(rs->io_kb[i], 6, rs->kb_base, i2p);
 		p2 = num2str(rs->agg[i], 6, rs->kb_base, i2p);
 		p3 = num2str(rs->min_bw[i], 6, rs->kb_base, i2p);
 		p4 = num2str(rs->max_bw[i], 6, rs->kb_base, i2p);

 		log_info("%s: io=%sB, aggrb=%sB/s, minb=%sB/s, maxb=%sB/s,"
 			 " mint=%llumsec, maxt=%llumsec\n", ddir_str[i], p1, p2,
 						p3, p4, rs->min_run[i],
 						rs->max_run[i]);

 		free(p1);
 		free(p2);
 		free(p3);
 		free(p4);
 	}
 }

 #define ts_total_io_u(ts)	\
 	((ts)->total_io_u[0] + (ts)->total_io_u[1])

 static void stat_calc_dist(unsigned int *map, unsigned long total,
 			   double *io_u_dist)
 {
 	int i;

 	/*
 	 * Do depth distribution calculations
 	 */
 	for (i = 0; i < FIO_IO_U_MAP_NR; i++) {
 		if (total) {
 			io_u_dist[i] = (double) map[i] / (double) total;
 			io_u_dist[i] *= 100.0;
 			if (io_u_dist[i] < 0.1 && map[i])
 				io_u_dist[i] = 0.1;
 		} else
 			io_u_dist[i] = 0.0;
 	}
 }

 static void stat_calc_lat(struct thread_stat *ts, double *dst,
 			  unsigned int *src, int nr)
 {
 	unsigned long total = ts_total_io_u(ts);
 	int i;

 	/*
 	 * Do latency distribution calculations
 	 */
 	for (i = 0; i < nr; i++) {
 		if (total) {
 			dst[i] = (double) src[i] / (double) total;
 			dst[i] *= 100.0;
 			if (dst[i] < 0.01 && src[i])
 				dst[i] = 0.01;
 		} else
 			dst[i] = 0.0;
 	}
 }

 static void stat_calc_lat_u(struct thread_stat *ts, double *io_u_lat)
 {
 	stat_calc_lat(ts, io_u_lat, ts->io_u_lat_u, FIO_IO_U_LAT_U_NR);
 }

 static void stat_calc_lat_m(struct thread_stat *ts, double *io_u_lat)
 {
 	stat_calc_lat(ts, io_u_lat, ts->io_u_lat_m, FIO_IO_U_LAT_M_NR);
 }

 static int usec_to_msec(unsigned long *min, unsigned long *max, double *mean,
 			double *dev)
 {
 	if (*min > 1000 && *max > 1000 && *mean > 1000.0 && *dev > 1000.0) {
 		*min /= 1000;
 		*max /= 1000;
 		*mean /= 1000.0;
 		*dev /= 1000.0;
 		return 0;
 	}

 	return 1;
 }

 static void show_ddir_status(struct group_run_stats *rs, struct thread_stat *ts,
 			     int ddir)
 {
 	const char *ddir_str[] = { "read ", "write" };
 	unsigned long min, max, runt;
 	unsigned long long bw, iops;
 	double mean, dev;
 	char *io_p, *bw_p, *iops_p;
 	int i2p;

 	assert(ddir_rw(ddir));

 	if (!ts->runtime[ddir])
 		return;

 	i2p = is_power_of_2(rs->kb_base);
 	runt = ts->runtime[ddir];

 	bw = (1000 * ts->io_bytes[ddir]) / runt;
 	io_p = num2str(ts->io_bytes[ddir], 6, 1, i2p);
 	bw_p = num2str(bw, 6, 1, i2p);

 	iops = (1000 * (uint64_t)ts->total_io_u[ddir]) / runt;
 	iops_p = num2str(iops, 6, 1, 0);

 	log_info("  %s: io=%sB, bw=%sB/s, iops=%s, runt=%6llumsec\n",
 					ddir_str[ddir], io_p, bw_p, iops_p,
 					ts->runtime[ddir]);

 	free(io_p);
 	free(bw_p);
 	free(iops_p);

 	if (calc_lat(&ts->slat_stat[ddir], &min, &max, &mean, &dev)) {
 		const char *base = "(usec)";
 		char *minp, *maxp;

 		if (!usec_to_msec(&min, &max, &mean, &dev))
 			base = "(msec)";

 		minp = num2str(min, 6, 1, 0);
 		maxp = num2str(max, 6, 1, 0);

 		log_info("    slat %s: min=%s, max=%s, avg=%5.02f,"
 			 " stdev=%5.02f\n", base, minp, maxp, mean, dev);

 		free(minp);
 		free(maxp);
 	}
 	if (calc_lat(&ts->clat_stat[ddir], &min, &max, &mean, &dev)) {
 		const char *base = "(usec)";
 		char *minp, *maxp;

 		if (!usec_to_msec(&min, &max, &mean, &dev))
 			base = "(msec)";

 		minp = num2str(min, 6, 1, 0);
 		maxp = num2str(max, 6, 1, 0);

 		log_info("    clat %s: min=%s, max=%s, avg=%5.02f,"
 			 " stdev=%5.02f\n", base, minp, maxp, mean, dev);

 		free(minp);
 		free(maxp);
 	}
 	if (calc_lat(&ts->lat_stat[ddir], &min, &max, &mean, &dev)) {
 		const char *base = "(usec)";
 		char *minp, *maxp;

 		if (!usec_to_msec(&min, &max, &mean, &dev))
 			base = "(msec)";

 		minp = num2str(min, 6, 1, 0);
 		maxp = num2str(max, 6, 1, 0);

 		log_info("     lat %s: min=%s, max=%s, avg=%5.02f,"
 			 " stdev=%5.02f\n", base, minp, maxp, mean, dev);

 		free(minp);
 		free(maxp);
 	}
 	if (calc_lat(&ts->bw_stat[ddir], &min, &max, &mean, &dev)) {
 		double p_of_agg;

 		p_of_agg = mean * 100 / (double) rs->agg[ddir];
 		log_info("    bw (KB/s) : min=%5lu, max=%5lu, per=%3.2f%%,"
 			 " avg=%5.02f, stdev=%5.02f\n", min, max, p_of_agg,
 							mean, dev);
 	}
 }

 static void show_lat(double *io_u_lat, int nr, const char **ranges,
 		     const char *msg)
 {
 	int new_line = 1, i, line = 0;

 	for (i = 0; i < nr; i++) {
 		if (io_u_lat[i] <= 0.0)
 			continue;
 		if (new_line) {
 			if (line)
 				log_info("\n");
 			log_info("     lat (%s): ", msg);
 			new_line = 0;
 			line = 0;
 		}
 		if (line)
 			log_info(", ");
 		log_info("%s%3.2f%%", ranges[i], io_u_lat[i]);
 		line++;
 		if (line == 5)
 			new_line = 1;
 	}
 }

 static void show_lat_u(double *io_u_lat_u)
 {
 	const char *ranges[] = { "2=", "4=", "10=", "20=", "50=", "100=",
 				 "250=", "500=", "750=", "1000=", };

 	show_lat(io_u_lat_u, FIO_IO_U_LAT_U_NR, ranges, "usec");
 }

 static void show_lat_m(double *io_u_lat_m)
 {
 	const char *ranges[] = { "2=", "4=", "10=", "20=", "50=", "100=",
 				 "250=", "500=", "750=", "1000=", "2000=",
 				 ">=2000=", };

 	show_lat(io_u_lat_m, FIO_IO_U_LAT_M_NR, ranges, "msec");
 }

 static void show_latencies(double *io_u_lat_u, double *io_u_lat_m)
 {
 	show_lat_u(io_u_lat_u);
 	log_info("\n");
 	show_lat_m(io_u_lat_m);
 	log_info("\n");
 }

 static void show_thread_status(struct thread_stat *ts,
 			       struct group_run_stats *rs)
 {
 	double usr_cpu, sys_cpu;
 	unsigned long runtime;
 	double io_u_dist[FIO_IO_U_MAP_NR];
 	double io_u_lat_u[FIO_IO_U_LAT_U_NR];
 	double io_u_lat_m[FIO_IO_U_LAT_M_NR];

 	if (!(ts->io_bytes[0] + ts->io_bytes[1]) &&
 	    !(ts->total_io_u[0] + ts->total_io_u[1]))
 		return;

 	if (!ts->error) {
 		log_info("%s: (groupid=%d, jobs=%d): err=%2d: pid=%d\n",
 					ts->name, ts->groupid, ts->members,
 					ts->error, (int) ts->pid);
 	} else {
 		log_info("%s: (groupid=%d, jobs=%d): err=%2d (%s): pid=%d\n",
 					ts->name, ts->groupid, ts->members,
 					ts->error, ts->verror, (int) ts->pid);
 	}

 	if (ts->description)
 		log_info("  Description  : [%s]\n", ts->description);

 	if (ts->io_bytes[DDIR_READ])
 		show_ddir_status(rs, ts, DDIR_READ);
 	if (ts->io_bytes[DDIR_WRITE])
 		show_ddir_status(rs, ts, DDIR_WRITE);

 	runtime = ts->total_run_time;
 	if (runtime) {
 		double runt = (double) runtime;

 		usr_cpu = (double) ts->usr_time * 100 / runt;
 		sys_cpu = (double) ts->sys_time * 100 / runt;
 	} else {
 		usr_cpu = 0;
 		sys_cpu = 0;
 	}

 	log_info("  cpu          : usr=%3.2f%%, sys=%3.2f%%, ctx=%lu, majf=%lu,"
 		 " minf=%lu\n", usr_cpu, sys_cpu, ts->ctx, ts->majf, ts->minf);

 	stat_calc_dist(ts->io_u_map, ts_total_io_u(ts), io_u_dist);
 	log_info("  IO depths    : 1=%3.1f%%, 2=%3.1f%%, 4=%3.1f%%, 8=%3.1f%%,"
 		 " 16=%3.1f%%, 32=%3.1f%%, >=64=%3.1f%%\n", io_u_dist[0],
 					io_u_dist[1], io_u_dist[2],
 					io_u_dist[3], io_u_dist[4],
 					io_u_dist[5], io_u_dist[6]);

 	stat_calc_dist(ts->io_u_submit, ts->total_submit, io_u_dist);
 	log_info("     submit    : 0=%3.1f%%, 4=%3.1f%%, 8=%3.1f%%, 16=%3.1f%%,"
 		 " 32=%3.1f%%, 64=%3.1f%%, >=64=%3.1f%%\n", io_u_dist[0],
 					io_u_dist[1], io_u_dist[2],
 					io_u_dist[3], io_u_dist[4],
 					io_u_dist[5], io_u_dist[6]);
 	stat_calc_dist(ts->io_u_complete, ts->total_complete, io_u_dist);
 	log_info("     complete  : 0=%3.1f%%, 4=%3.1f%%, 8=%3.1f%%, 16=%3.1f%%,"
 		 " 32=%3.1f%%, 64=%3.1f%%, >=64=%3.1f%%\n", io_u_dist[0],
 					io_u_dist[1], io_u_dist[2],
 					io_u_dist[3], io_u_dist[4],
 					io_u_dist[5], io_u_dist[6]);
 	log_info("     issued r/w/d: total=%lu/%lu/%lu, short=%lu/%lu/%lu\n",
 					ts->total_io_u[0], ts->total_io_u[1],
 					ts->total_io_u[2],
 					ts->short_io_u[0], ts->short_io_u[1],
 					ts->short_io_u[2]);
 	stat_calc_lat_u(ts, io_u_lat_u);
 	stat_calc_lat_m(ts, io_u_lat_m);
 	show_latencies(io_u_lat_u, io_u_lat_m);
 	if (ts->continue_on_error) {
 		log_info("     errors    : total=%lu, first_error=%d/<%s>\n",
 					ts->total_err_count,
 					ts->first_error,
 					strerror(ts->first_error));
 	}
 }

 static void show_ddir_status_terse(struct thread_stat *ts,
 				   struct group_run_stats *rs, int ddir)
 {
 	unsigned long min, max;
 	unsigned long long bw;
 	double mean, dev;

 	assert(ddir_rw(ddir));

 	bw = 0;
 	if (ts->runtime[ddir])
 		bw = ts->io_bytes[ddir] / ts->runtime[ddir];

 	log_info(";%llu;%llu;%llu", ts->io_bytes[ddir] >> 10, bw,
 							ts->runtime[ddir]);

 	if (calc_lat(&ts->slat_stat[ddir], &min, &max, &mean, &dev))
 		log_info(";%lu;%lu;%f;%f", min, max, mean, dev);
 	else
 		log_info(";%lu;%lu;%f;%f", 0UL, 0UL, 0.0, 0.0);

 	if (calc_lat(&ts->clat_stat[ddir], &min, &max, &mean, &dev))
 		log_info(";%lu;%lu;%f;%f", min, max, mean, dev);
 	else
 		log_info(";%lu;%lu;%f;%f", 0UL, 0UL, 0.0, 0.0);

 	if (calc_lat(&ts->lat_stat[ddir], &min, &max, &mean, &dev))
 		log_info(";%lu;%lu;%f;%f", min, max, mean, dev);
 	else
 		log_info(";%lu;%lu;%f;%f", 0UL, 0UL, 0.0, 0.0);

 	if (calc_lat(&ts->bw_stat[ddir], &min, &max, &mean, &dev)) {
 		double p_of_agg;

 		p_of_agg = mean * 100 / (double) rs->agg[ddir];
 		log_info(";%lu;%lu;%f%%;%f;%f", min, max, p_of_agg, mean, dev);
 	} else
 		log_info(";%lu;%lu;%f%%;%f;%f", 0UL, 0UL, 0.0, 0.0, 0.0);
 }

 #define FIO_TERSE_VERSION	"2"

 static void show_thread_status_terse(struct thread_stat *ts,
 				     struct group_run_stats *rs)
 {
 	double io_u_dist[FIO_IO_U_MAP_NR];
 	double io_u_lat_u[FIO_IO_U_LAT_U_NR];
 	double io_u_lat_m[FIO_IO_U_LAT_M_NR];
 	double usr_cpu, sys_cpu;
 	int i;

 	/* General Info */
 	log_info("%s;%s;%d;%d", FIO_TERSE_VERSION, ts->name, ts->groupid,
 				ts->error);
 	/* Log Read Status */
 	show_ddir_status_terse(ts, rs, 0);
 	/* Log Write Status */
 	show_ddir_status_terse(ts, rs, 1);

 	/* CPU Usage */
 	if (ts->total_run_time) {
 		double runt = (double) ts->total_run_time;

 		usr_cpu = (double) ts->usr_time * 100 / runt;
 		sys_cpu = (double) ts->sys_time * 100 / runt;
 	} else {
 		usr_cpu = 0;
 		sys_cpu = 0;
 	}

 	log_info(";%f%%;%f%%;%lu;%lu;%lu", usr_cpu, sys_cpu, ts->ctx, ts->majf,
 								ts->minf);

 	/* Calc % distribution of IO depths, usecond, msecond latency */
 	stat_calc_dist(ts->io_u_map, ts_total_io_u(ts), io_u_dist);
 	stat_calc_lat_u(ts, io_u_lat_u);
 	stat_calc_lat_m(ts, io_u_lat_m);

 	/* Only show fixed 7 I/O depth levels*/
 	log_info(";%3.1f%%;%3.1f%%;%3.1f%%;%3.1f%%;%3.1f%%;%3.1f%%;%3.1f%%",
 			io_u_dist[0], io_u_dist[1], io_u_dist[2], io_u_dist[3],
 			io_u_dist[4], io_u_dist[5], io_u_dist[6]);

 	/* Microsecond latency */
 	for (i = 0; i < FIO_IO_U_LAT_U_NR; i++)
 		log_info(";%3.2f%%", io_u_lat_u[i]);
 	/* Millisecond latency */
 	for (i = 0; i < FIO_IO_U_LAT_M_NR; i++)
 		log_info(";%3.2f%%", io_u_lat_m[i]);
 	/* Additional output if continue_on_error set - default off*/
 	if (ts->continue_on_error)
 		log_info(";%lu;%d", ts->total_err_count, ts->first_error);
 	log_info("\n");

 	/* Additional output if description is set */
 	if (ts->description)
 		log_info(";%s", ts->description);

 	log_info("\n");
 }

 static void sum_stat(struct io_stat *dst, struct io_stat *src, int nr)
 {
 	double mean, S;

 	dst->min_val = min(dst->min_val, src->min_val);
 	dst->max_val = max(dst->max_val, src->max_val);

 	/*
 	 * Compute new mean and S after the merge
 	 * <http://en.wikipedia.org/wiki/Algorithms_for_calculating_variance
 	 *  #Parallel_algorithm>
 	 */
 	if (nr == 1) {
 		mean = src->mean;
 		S = src->S;
 	} else {
 		double delta = src->mean - dst->mean;

 		mean = ((src->mean * src->samples) +
 			(dst->mean * dst->samples)) /
 			(dst->samples + src->samples);

 		S =  src->S + dst->S + pow(delta, 2.0) *
 			(dst->samples * src->samples) /
 			(dst->samples + src->samples);
 	}

 	dst->samples += src->samples;
 	dst->mean = mean;
 	dst->S = S;
 }

 void show_run_stats(void)
 {
 	struct group_run_stats *runstats, *rs;
 	struct thread_data *td;
 	struct thread_stat *threadstats, *ts;
 	int i, j, k, l, nr_ts, last_ts, idx;
 	int kb_base_warned = 0;

 	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;
 	}

 	/*
 	 * find out how many threads stats we need. if group reporting isn't
 	 * enabled, it's one-per-td.
 	 */
 	nr_ts = 0;
 	last_ts = -1;
 	for_each_td(td, i) {
 		if (!td->o.group_reporting) {
 			nr_ts++;
 			continue;
 		}
 		if (last_ts == td->groupid)
 			continue;

 		last_ts = td->groupid;
 		nr_ts++;
 	}

 	threadstats = malloc(nr_ts * sizeof(struct thread_stat));

 	for (i = 0; i < nr_ts; i++) {
 		ts = &threadstats[i];

 		memset(ts, 0, sizeof(*ts));
 		for (j = 0; j <= DDIR_WRITE; j++) {
 			ts->lat_stat[j].min_val = -1UL;
 			ts->clat_stat[j].min_val = -1UL;
 			ts->slat_stat[j].min_val = -1UL;
 			ts->bw_stat[j].min_val = -1UL;
 		}
 		ts->groupid = -1;
 	}

 	j = 0;
 	last_ts = -1;
 	idx = 0;
 	for_each_td(td, i) {
 		if (idx && (!td->o.group_reporting ||
 		    (td->o.group_reporting && last_ts != td->groupid))) {
 			idx = 0;
 			j++;
 		}

 		last_ts = td->groupid;

 		ts = &threadstats[j];

 		idx++;
 		ts->members++;

 		if (ts->groupid == -1) {
 			/*
 			 * These are per-group shared already
 			 */
 			ts->name = td->o.name;
 			ts->description = td->o.description;
 			ts->groupid = td->groupid;

 			/*
 			 * first pid in group, not very useful...
 			 */
 			ts->pid = td->pid;

 			ts->kb_base = td->o.kb_base;
 		} else if (ts->kb_base != td->o.kb_base && !kb_base_warned) {
 			log_info("fio: kb_base differs for jobs in group, using"
 				 " %u as the base\n", ts->kb_base);
 			kb_base_warned = 1;
 		}

 		ts->continue_on_error = td->o.continue_on_error;
 		ts->total_err_count += td->total_err_count;
 		ts->first_error = td->first_error;
 		if (!ts->error) {
 			if (!td->error && td->o.continue_on_error &&
 			    td->first_error) {
 				ts->error = td->first_error;
 				ts->verror = td->verror;
 			} else  if (td->error) {
 				ts->error = td->error;
 				ts->verror = td->verror;
 			}
 		}

 		for (l = 0; l <= DDIR_WRITE; l++) {
 			sum_stat(&ts->clat_stat[l], &td->ts.clat_stat[l], idx);
 			sum_stat(&ts->slat_stat[l], &td->ts.slat_stat[l], idx);
 			sum_stat(&ts->lat_stat[l], &td->ts.lat_stat[l], idx);
 			sum_stat(&ts->bw_stat[l], &td->ts.bw_stat[l], idx);

 			ts->stat_io_bytes[l] += td->ts.stat_io_bytes[l];
 			ts->io_bytes[l] += td->ts.io_bytes[l];

 			if (ts->runtime[l] < td->ts.runtime[l])
 				ts->runtime[l] = td->ts.runtime[l];
 		}

 		ts->usr_time += td->ts.usr_time;
 		ts->sys_time += td->ts.sys_time;
 		ts->ctx += td->ts.ctx;
 		ts->majf += td->ts.majf;
 		ts->minf += td->ts.minf;

 		for (k = 0; k < FIO_IO_U_MAP_NR; k++)
 			ts->io_u_map[k] += td->ts.io_u_map[k];
 		for (k = 0; k < FIO_IO_U_MAP_NR; k++)
 			ts->io_u_submit[k] += td->ts.io_u_submit[k];
 		for (k = 0; k < FIO_IO_U_MAP_NR; k++)
 			ts->io_u_complete[k] += td->ts.io_u_complete[k];
 		for (k = 0; k < FIO_IO_U_LAT_U_NR; k++)
 			ts->io_u_lat_u[k] += td->ts.io_u_lat_u[k];
 		for (k = 0; k < FIO_IO_U_LAT_M_NR; k++)
 			ts->io_u_lat_m[k] += td->ts.io_u_lat_m[k];


 		for (k = 0; k <= 2; k++) {
 			ts->total_io_u[k] += td->ts.total_io_u[k];
 			ts->short_io_u[k] += td->ts.short_io_u[k];
 		}

 		ts->total_run_time += td->ts.total_run_time;
 		ts->total_submit += td->ts.total_submit;
 		ts->total_complete += td->ts.total_complete;
 	}

 	for (i = 0; i < nr_ts; i++) {
 		unsigned long long bw;

 		ts = &threadstats[i];
 		rs = &runstats[ts->groupid];
 		rs->kb_base = ts->kb_base;

 		for (j = 0; j <= DDIR_WRITE; j++) {
 			if (!ts->runtime[j])
 				continue;
 			if (ts->runtime[j] < rs->min_run[j] || !rs->min_run[j])
 				rs->min_run[j] = ts->runtime[j];
 			if (ts->runtime[j] > rs->max_run[j])
 				rs->max_run[j] = ts->runtime[j];

 			bw = 0;
 			if (ts->runtime[j]) {
 				unsigned long runt;

 				runt = ts->runtime[j];
 				bw = ts->io_bytes[j] / runt;
 			}
 			if (bw < rs->min_bw[j])
 				rs->min_bw[j] = bw;
 			if (bw > rs->max_bw[j])
 				rs->max_bw[j] = bw;

 			rs->io_kb[j] += ts->io_bytes[j] / rs->kb_base;
 		}
 	}

 	for (i = 0; i < groupid + 1; i++) {
 		unsigned long max_run[2];

 		rs = &runstats[i];
 		max_run[0] = rs->max_run[0];
 		max_run[1] = rs->max_run[1];

 		if (rs->max_run[0])
 			rs->agg[0] = (rs->io_kb[0] * 1000) / max_run[0];
 		if (rs->max_run[1])
 			rs->agg[1] = (rs->io_kb[1] * 1000) / max_run[1];
 	}

 	/*
 	 * don't overwrite last signal output
 	 */
 	if (!terse_output)
 		log_info("\n");

 	for (i = 0; i < nr_ts; i++) {
 		ts = &threadstats[i];
 		rs = &runstats[ts->groupid];

 		if (terse_output)
 			show_thread_status_terse(ts, rs);
 		else
 			show_thread_status(ts, rs);
 	}

 	if (!terse_output) {
 		for (i = 0; i < groupid + 1; i++)
 			show_group_stats(&runstats[i], i);

 		show_disk_util();
 	}

 	free(runstats);
 	free(threadstats);
 }

 static inline void add_stat_sample(struct io_stat *is, unsigned long data)
 {
 	double val = data;
 	double delta;

 	if (data > is->max_val)
 		is->max_val = data;
 	if (data < is->min_val)
 		is->min_val = data;

 	delta = val - is->mean;
 	if (delta) {
 		is->mean += delta / (is->samples + 1.0);
 		is->S += delta * (val - is->mean);
 	}

 	is->samples++;
 }

 static void __add_log_sample(struct io_log *iolog, unsigned long val,
 			     enum fio_ddir ddir, unsigned int bs,
 			     unsigned long t)
 {
 	const int nr_samples = iolog->nr_samples;

 	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[nr_samples].val = val;
 	iolog->log[nr_samples].time = t;
 	iolog->log[nr_samples].ddir = ddir;
 	iolog->log[nr_samples].bs = bs;
 	iolog->nr_samples++;
 }

 static void add_log_sample(struct thread_data *td, struct io_log *iolog,
 			   unsigned long val, enum fio_ddir ddir,
 			   unsigned int bs)
 {
 	if (!ddir_rw(ddir))
 		return;

 	__add_log_sample(iolog, val, ddir, bs, mtime_since_now(&td->epoch));
 }

 void add_agg_sample(unsigned long val, enum fio_ddir ddir, unsigned int bs)
 {
 	struct io_log *iolog;

 	if (!ddir_rw(ddir))
 		return;

 	iolog = agg_io_log[ddir];
 	__add_log_sample(iolog, val, ddir, bs, mtime_since_genesis());
 }

 void add_clat_sample(struct thread_data *td, enum fio_ddir ddir,
 		     unsigned long usec, unsigned int bs)
 {
 	struct thread_stat *ts = &td->ts;

 	if (!ddir_rw(ddir))
 		return;

 	add_stat_sample(&ts->clat_stat[ddir], usec);

 	if (ts->clat_log)
 		add_log_sample(td, ts->clat_log, usec, ddir, bs);
 }

 void add_slat_sample(struct thread_data *td, enum fio_ddir ddir,
 		     unsigned long usec, unsigned int bs)
 {
 	struct thread_stat *ts = &td->ts;

 	if (!ddir_rw(ddir))
 		return;

 	add_stat_sample(&ts->slat_stat[ddir], usec);

 	if (ts->slat_log)
 		add_log_sample(td, ts->slat_log, usec, ddir, bs);
 }

 void add_lat_sample(struct thread_data *td, enum fio_ddir ddir,
 		    unsigned long usec, unsigned int bs)
 {
 	struct thread_stat *ts = &td->ts;

 	if (!ddir_rw(ddir))
 		return;

 	add_stat_sample(&ts->lat_stat[ddir], usec);

 	if (ts->lat_log)
 		add_log_sample(td, ts->lat_log, usec, ddir, bs);
 }

 void add_bw_sample(struct thread_data *td, enum fio_ddir ddir, unsigned int bs,
 		   struct timeval *t)
 {
 	struct thread_stat *ts = &td->ts;
 	unsigned long spent, rate;

 	if (!ddir_rw(ddir))
 		return;

 	spent = mtime_since(&ts->stat_sample_time[ddir], t);
 	if (spent < td->o.bw_avg_time)
 		return;

 	rate = (td->this_io_bytes[ddir] - ts->stat_io_bytes[ddir]) *
 			1000 / spent / 1024;
 	add_stat_sample(&ts->bw_stat[ddir], rate);

 	if (ts->bw_log)
 		add_log_sample(td, ts->bw_log, rate, ddir, bs);

 	fio_gettime(&ts->stat_sample_time[ddir], NULL);
 	ts->stat_io_bytes[ddir] = td->this_io_bytes[ddir];
 }
	#include <stdio.h>
	#include <string.h>
	#include <sys/time.h>
	#include <sys/types.h>
	#include <sys/stat.h>
	#include <dirent.h>
	#include <libgen.h>
	#include <math.h>

	#include "fio.h"
	#include "diskutil.h"

	void update_rusage_stat(struct thread_data *td)
	{
	struct thread_stat *ts = &td->ts;

	getrusage(RUSAGE_SELF, &ts->ru_end);

	ts->usr_time += mtime_since(&ts->ru_start.ru_utime,
	&ts->ru_end.ru_utime);
	ts->sys_time += mtime_since(&ts->ru_start.ru_stime,
	&ts->ru_end.ru_stime);
	ts->ctx += ts->ru_end.ru_nvcsw + ts->ru_end.ru_nivcsw
	- (ts->ru_start.ru_nvcsw + ts->ru_start.ru_nivcsw);
	ts->minf += ts->ru_end.ru_minflt - ts->ru_start.ru_minflt;
	ts->majf += ts->ru_end.ru_majflt - ts->ru_start.ru_majflt;

	memcpy(&ts->ru_start, &ts->ru_end, sizeof(ts->ru_end));
	}

	static int calc_lat(struct io_stat is, unsigned long min, unsigned long *max,
	double mean, double dev)
	{
	double n = is->samples;

	if (is->samples == 0)
	return 0;

	*min = is->min_val;
	*max = is->max_val;

	n = (double) is->samples;
	*mean = is->mean;

	if (n > 1.0)
	*dev = sqrt(is->S / (n - 1.0));
	else
	*dev = 0;

	return 1;
	}

	static void show_group_stats(struct group_run_stats *rs, int id)
	{
	char p1, p2, p3, p4;
	const char *ddir_str[] = { " READ", " WRITE" };
	int i;

	log_info("\nRun status group %d (all jobs):\n", id);

	for (i = 0; i <= DDIR_WRITE; i++) {
	const int i2p = is_power_of_2(rs->kb_base);

	if (!rs->max_run[i])
	continue;

	p1 = num2str(rs->io_kb[i], 6, rs->kb_base, i2p);
	p2 = num2str(rs->agg[i], 6, rs->kb_base, i2p);
	p3 = num2str(rs->min_bw[i], 6, rs->kb_base, i2p);
	p4 = num2str(rs->max_bw[i], 6, rs->kb_base, i2p);

	log_info("%s: io=%sB, aggrb=%sB/s, minb=%sB/s, maxb=%sB/s,"
	" mint=%llumsec, maxt=%llumsec\n", ddir_str[i], p1, p2,
	p3, p4, rs->min_run[i],
	rs->max_run[i]);

	free(p1);
	free(p2);
	free(p3);
	free(p4);
	}
	}

	#define ts_total_io_u(ts) \
	((ts)->total_io_u[0] + (ts)->total_io_u[1])

	static void stat_calc_dist(unsigned int *map, unsigned long total,
	double *io_u_dist)
	{
	int i;

	/*
	* Do depth distribution calculations
	*/
	for (i = 0; i < FIO_IO_U_MAP_NR; i++) {
	if (total) {
	io_u_dist[i] = (double) map[i] / (double) total;
	io_u_dist[i] *= 100.0;
	if (io_u_dist[i] < 0.1 && map[i])
	io_u_dist[i] = 0.1;
	} else
	io_u_dist[i] = 0.0;
	}
	}

	static void stat_calc_lat(struct thread_stat ts, double dst,
	unsigned int *src, int nr)
	{
	unsigned long total = ts_total_io_u(ts);
	int i;

	/*
	* Do latency distribution calculations
	*/
	for (i = 0; i < nr; i++) {
	if (total) {
	dst[i] = (double) src[i] / (double) total;
	dst[i] *= 100.0;
	if (dst[i] < 0.01 && src[i])
	dst[i] = 0.01;
	} else
	dst[i] = 0.0;
	}
	}

	static void stat_calc_lat_u(struct thread_stat ts, double io_u_lat)
	{
	stat_calc_lat(ts, io_u_lat, ts->io_u_lat_u, FIO_IO_U_LAT_U_NR);
	}

	static void stat_calc_lat_m(struct thread_stat ts, double io_u_lat)
	{
	stat_calc_lat(ts, io_u_lat, ts->io_u_lat_m, FIO_IO_U_LAT_M_NR);
	}

	static int usec_to_msec(unsigned long min, unsigned long max, double *mean,
	double *dev)
	{
	if (min > 1000 && max > 1000 && mean > 1000.0 && dev > 1000.0) {
	*min /= 1000;
	*max /= 1000;
	*mean /= 1000.0;
	*dev /= 1000.0;
	return 0;
	}

	return 1;
	}

	static void show_ddir_status(struct group_run_stats rs, struct thread_stat ts,
	int ddir)
	{
	const char *ddir_str[] = { "read ", "write" };
	unsigned long min, max, runt;
	unsigned long long bw, iops;
	double mean, dev;
	char io_p, bw_p, *iops_p;
	int i2p;

	assert(ddir_rw(ddir));

	if (!ts->runtime[ddir])
	return;

	i2p = is_power_of_2(rs->kb_base);
	runt = ts->runtime[ddir];

	bw = (1000 * ts->io_bytes[ddir]) / runt;
	io_p = num2str(ts->io_bytes[ddir], 6, 1, i2p);
	bw_p = num2str(bw, 6, 1, i2p);

	iops = (1000 * (uint64_t)ts->total_io_u[ddir]) / runt;
	iops_p = num2str(iops, 6, 1, 0);

	log_info(" %s: io=%sB, bw=%sB/s, iops=%s, runt=%6llumsec\n",
	ddir_str[ddir], io_p, bw_p, iops_p,
	ts->runtime[ddir]);

	free(io_p);
	free(bw_p);
	free(iops_p);

	if (calc_lat(&ts->slat_stat[ddir], &min, &max, &mean, &dev)) {
	const char *base = "(usec)";
	char minp, maxp;

	if (!usec_to_msec(&min, &max, &mean, &dev))
	base = "(msec)";

	minp = num2str(min, 6, 1, 0);
	maxp = num2str(max, 6, 1, 0);

	log_info(" slat %s: min=%s, max=%s, avg=%5.02f,"
	" stdev=%5.02f\n", base, minp, maxp, mean, dev);

	free(minp);
	free(maxp);
	}
	if (calc_lat(&ts->clat_stat[ddir], &min, &max, &mean, &dev)) {
	const char *base = "(usec)";
	char minp, maxp;

	if (!usec_to_msec(&min, &max, &mean, &dev))
	base = "(msec)";

	minp = num2str(min, 6, 1, 0);
	maxp = num2str(max, 6, 1, 0);

	log_info(" clat %s: min=%s, max=%s, avg=%5.02f,"
	" stdev=%5.02f\n", base, minp, maxp, mean, dev);

	free(minp);
	free(maxp);
	}
	if (calc_lat(&ts->lat_stat[ddir], &min, &max, &mean, &dev)) {
	const char *base = "(usec)";
	char minp, maxp;

	if (!usec_to_msec(&min, &max, &mean, &dev))
	base = "(msec)";

	minp = num2str(min, 6, 1, 0);
	maxp = num2str(max, 6, 1, 0);

	log_info(" lat %s: min=%s, max=%s, avg=%5.02f,"
	" stdev=%5.02f\n", base, minp, maxp, mean, dev);

	free(minp);
	free(maxp);
	}
	if (calc_lat(&ts->bw_stat[ddir], &min, &max, &mean, &dev)) {
	double p_of_agg;

	p_of_agg = mean * 100 / (double) rs->agg[ddir];
	log_info(" bw (KB/s) : min=%5lu, max=%5lu, per=%3.2f%%,"
	" avg=%5.02f, stdev=%5.02f\n", min, max, p_of_agg,
	mean, dev);
	}
	}

	static void show_lat(double io_u_lat, int nr, const char *ranges,
	const char *msg)
	{
	int new_line = 1, i, line = 0;

	for (i = 0; i < nr; i++) {
	if (io_u_lat[i] <= 0.0)
	continue;
	if (new_line) {
	if (line)
	log_info("\n");
	log_info(" lat (%s): ", msg);
	new_line = 0;
	line = 0;
	}
	if (line)
	log_info(", ");
	log_info("%s%3.2f%%", ranges[i], io_u_lat[i]);
	line++;
	if (line == 5)
	new_line = 1;
	}
	}

	static void show_lat_u(double *io_u_lat_u)
	{
	const char *ranges[] = { "2=", "4=", "10=", "20=", "50=", "100=",
	"250=", "500=", "750=", "1000=", };

	show_lat(io_u_lat_u, FIO_IO_U_LAT_U_NR, ranges, "usec");
	}

	static void show_lat_m(double *io_u_lat_m)
	{
	const char *ranges[] = { "2=", "4=", "10=", "20=", "50=", "100=",
	"250=", "500=", "750=", "1000=", "2000=",
	">=2000=", };

	show_lat(io_u_lat_m, FIO_IO_U_LAT_M_NR, ranges, "msec");
	}

	static void show_latencies(double io_u_lat_u, double io_u_lat_m)
	{
	show_lat_u(io_u_lat_u);
	log_info("\n");
	show_lat_m(io_u_lat_m);
	log_info("\n");
	}

	static void show_thread_status(struct thread_stat *ts,
	struct group_run_stats *rs)
	{
	double usr_cpu, sys_cpu;
	unsigned long runtime;
	double io_u_dist[FIO_IO_U_MAP_NR];
	double io_u_lat_u[FIO_IO_U_LAT_U_NR];
	double io_u_lat_m[FIO_IO_U_LAT_M_NR];

	if (!(ts->io_bytes[0] + ts->io_bytes[1]) &&
	!(ts->total_io_u[0] + ts->total_io_u[1]))
	return;

	if (!ts->error) {
	log_info("%s: (groupid=%d, jobs=%d): err=%2d: pid=%d\n",
	ts->name, ts->groupid, ts->members,
	ts->error, (int) ts->pid);
	} else {
	log_info("%s: (groupid=%d, jobs=%d): err=%2d (%s): pid=%d\n",
	ts->name, ts->groupid, ts->members,
	ts->error, ts->verror, (int) ts->pid);
	}

	if (ts->description)
	log_info(" Description : [%s]\n", ts->description);

	if (ts->io_bytes[DDIR_READ])
	show_ddir_status(rs, ts, DDIR_READ);
	if (ts->io_bytes[DDIR_WRITE])
	show_ddir_status(rs, ts, DDIR_WRITE);

	runtime = ts->total_run_time;
	if (runtime) {
	double runt = (double) runtime;

	usr_cpu = (double) ts->usr_time * 100 / runt;
	sys_cpu = (double) ts->sys_time * 100 / runt;
	} else {
	usr_cpu = 0;
	sys_cpu = 0;
	}

	log_info(" cpu : usr=%3.2f%%, sys=%3.2f%%, ctx=%lu, majf=%lu,"
	" minf=%lu\n", usr_cpu, sys_cpu, ts->ctx, ts->majf, ts->minf);

	stat_calc_dist(ts->io_u_map, ts_total_io_u(ts), io_u_dist);
	log_info(" IO depths : 1=%3.1f%%, 2=%3.1f%%, 4=%3.1f%%, 8=%3.1f%%,"
	" 16=%3.1f%%, 32=%3.1f%%, >=64=%3.1f%%\n", io_u_dist[0],
	io_u_dist[1], io_u_dist[2],
	io_u_dist[3], io_u_dist[4],
	io_u_dist[5], io_u_dist[6]);

	stat_calc_dist(ts->io_u_submit, ts->total_submit, io_u_dist);
	log_info(" submit : 0=%3.1f%%, 4=%3.1f%%, 8=%3.1f%%, 16=%3.1f%%,"
	" 32=%3.1f%%, 64=%3.1f%%, >=64=%3.1f%%\n", io_u_dist[0],
	io_u_dist[1], io_u_dist[2],
	io_u_dist[3], io_u_dist[4],
	io_u_dist[5], io_u_dist[6]);
	stat_calc_dist(ts->io_u_complete, ts->total_complete, io_u_dist);
	log_info(" complete : 0=%3.1f%%, 4=%3.1f%%, 8=%3.1f%%, 16=%3.1f%%,"
	" 32=%3.1f%%, 64=%3.1f%%, >=64=%3.1f%%\n", io_u_dist[0],
	io_u_dist[1], io_u_dist[2],
	io_u_dist[3], io_u_dist[4],
	io_u_dist[5], io_u_dist[6]);
	log_info(" issued r/w/d: total=%lu/%lu/%lu, short=%lu/%lu/%lu\n",
	ts->total_io_u[0], ts->total_io_u[1],
	ts->total_io_u[2],
	ts->short_io_u[0], ts->short_io_u[1],
	ts->short_io_u[2]);
	stat_calc_lat_u(ts, io_u_lat_u);
	stat_calc_lat_m(ts, io_u_lat_m);
	show_latencies(io_u_lat_u, io_u_lat_m);
	if (ts->continue_on_error) {
	log_info(" errors : total=%lu, first_error=%d/<%s>\n",
	ts->total_err_count,
	ts->first_error,
	strerror(ts->first_error));
	}
	}

	static void show_ddir_status_terse(struct thread_stat *ts,
	struct group_run_stats *rs, int ddir)
	{
	unsigned long min, max;
	unsigned long long bw;
	double mean, dev;

	assert(ddir_rw(ddir));

	bw = 0;
	if (ts->runtime[ddir])
	bw = ts->io_bytes[ddir] / ts->runtime[ddir];

	log_info(";%llu;%llu;%llu", ts->io_bytes[ddir] >> 10, bw,
	ts->runtime[ddir]);

	if (calc_lat(&ts->slat_stat[ddir], &min, &max, &mean, &dev))
	log_info(";%lu;%lu;%f;%f", min, max, mean, dev);
	else
	log_info(";%lu;%lu;%f;%f", 0UL, 0UL, 0.0, 0.0);

	if (calc_lat(&ts->clat_stat[ddir], &min, &max, &mean, &dev))
	log_info(";%lu;%lu;%f;%f", min, max, mean, dev);
	else
	log_info(";%lu;%lu;%f;%f", 0UL, 0UL, 0.0, 0.0);

	if (calc_lat(&ts->lat_stat[ddir], &min, &max, &mean, &dev))
	log_info(";%lu;%lu;%f;%f", min, max, mean, dev);
	else
	log_info(";%lu;%lu;%f;%f", 0UL, 0UL, 0.0, 0.0);

	if (calc_lat(&ts->bw_stat[ddir], &min, &max, &mean, &dev)) {
	double p_of_agg;

	p_of_agg = mean * 100 / (double) rs->agg[ddir];
	log_info(";%lu;%lu;%f%%;%f;%f", min, max, p_of_agg, mean, dev);
	} else
	log_info(";%lu;%lu;%f%%;%f;%f", 0UL, 0UL, 0.0, 0.0, 0.0);
	}

	#define FIO_TERSE_VERSION "2"

	static void show_thread_status_terse(struct thread_stat *ts,
	struct group_run_stats *rs)
	{
	double io_u_dist[FIO_IO_U_MAP_NR];
	double io_u_lat_u[FIO_IO_U_LAT_U_NR];
	double io_u_lat_m[FIO_IO_U_LAT_M_NR];
	double usr_cpu, sys_cpu;
	int i;

	/* General Info */
	log_info("%s;%s;%d;%d", FIO_TERSE_VERSION, ts->name, ts->groupid,
	ts->error);
	/* Log Read Status */
	show_ddir_status_terse(ts, rs, 0);
	/* Log Write Status */
	show_ddir_status_terse(ts, rs, 1);

	/* CPU Usage */
	if (ts->total_run_time) {
	double runt = (double) ts->total_run_time;

	usr_cpu = (double) ts->usr_time * 100 / runt;
	sys_cpu = (double) ts->sys_time * 100 / runt;
	} else {
	usr_cpu = 0;
	sys_cpu = 0;
	}

	log_info(";%f%%;%f%%;%lu;%lu;%lu", usr_cpu, sys_cpu, ts->ctx, ts->majf,
	ts->minf);

	/* Calc % distribution of IO depths, usecond, msecond latency */
	stat_calc_dist(ts->io_u_map, ts_total_io_u(ts), io_u_dist);
	stat_calc_lat_u(ts, io_u_lat_u);
	stat_calc_lat_m(ts, io_u_lat_m);

	/* Only show fixed 7 I/O depth levels*/
	log_info(";%3.1f%%;%3.1f%%;%3.1f%%;%3.1f%%;%3.1f%%;%3.1f%%;%3.1f%%",
	io_u_dist[0], io_u_dist[1], io_u_dist[2], io_u_dist[3],
	io_u_dist[4], io_u_dist[5], io_u_dist[6]);

	/* Microsecond latency */
	for (i = 0; i < FIO_IO_U_LAT_U_NR; i++)
	log_info(";%3.2f%%", io_u_lat_u[i]);
	/* Millisecond latency */
	for (i = 0; i < FIO_IO_U_LAT_M_NR; i++)
	log_info(";%3.2f%%", io_u_lat_m[i]);
	/* Additional output if continue_on_error set - default off*/
	if (ts->continue_on_error)
	log_info(";%lu;%d", ts->total_err_count, ts->first_error);
	log_info("\n");

	/* Additional output if description is set */
	if (ts->description)
	log_info(";%s", ts->description);

	log_info("\n");
	}

	static void sum_stat(struct io_stat dst, struct io_stat src, int nr)
	{
	double mean, S;

	dst->min_val = min(dst->min_val, src->min_val);
	dst->max_val = max(dst->max_val, src->max_val);

	/*
	* Compute new mean and S after the merge
	* <http://en.wikipedia.org/wiki/Algorithms_for_calculating_variance
	* #Parallel_algorithm>
	*/
	if (nr == 1) {
	mean = src->mean;
	S = src->S;
	} else {
	double delta = src->mean - dst->mean;

	mean = ((src->mean * src->samples) +
	(dst->mean * dst->samples)) /
	(dst->samples + src->samples);

	S = src->S + dst->S + pow(delta, 2.0) *
	(dst->samples * src->samples) /
	(dst->samples + src->samples);
	}

	dst->samples += src->samples;
	dst->mean = mean;
	dst->S = S;
	}

	void show_run_stats(void)
	{
	struct group_run_stats runstats, rs;
	struct thread_data *td;
	struct thread_stat threadstats, ts;
	int i, j, k, l, nr_ts, last_ts, idx;
	int kb_base_warned = 0;

	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;
	}

	/*
	* find out how many threads stats we need. if group reporting isn't
	* enabled, it's one-per-td.
	*/
	nr_ts = 0;
	last_ts = -1;
	for_each_td(td, i) {
	if (!td->o.group_reporting) {
	nr_ts++;
	continue;
	}
	if (last_ts == td->groupid)
	continue;

	last_ts = td->groupid;
	nr_ts++;
	}

	threadstats = malloc(nr_ts * sizeof(struct thread_stat));

	for (i = 0; i < nr_ts; i++) {
	ts = &threadstats[i];

	memset(ts, 0, sizeof(*ts));
	for (j = 0; j <= DDIR_WRITE; j++) {
	ts->lat_stat[j].min_val = -1UL;
	ts->clat_stat[j].min_val = -1UL;
	ts->slat_stat[j].min_val = -1UL;
	ts->bw_stat[j].min_val = -1UL;
	}
	ts->groupid = -1;
	}

	j = 0;
	last_ts = -1;
	idx = 0;
	for_each_td(td, i) {
	if (idx && (!td->o.group_reporting \|\|
	(td->o.group_reporting && last_ts != td->groupid))) {
	idx = 0;
	j++;
	}

	last_ts = td->groupid;

	ts = &threadstats[j];

	idx++;
	ts->members++;

	if (ts->groupid == -1) {
	/*
	* These are per-group shared already
	*/
	ts->name = td->o.name;
	ts->description = td->o.description;
	ts->groupid = td->groupid;

	/*
	* first pid in group, not very useful...
	*/
	ts->pid = td->pid;

	ts->kb_base = td->o.kb_base;
	} else if (ts->kb_base != td->o.kb_base && !kb_base_warned) {
	log_info("fio: kb_base differs for jobs in group, using"
	" %u as the base\n", ts->kb_base);
	kb_base_warned = 1;
	}

	ts->continue_on_error = td->o.continue_on_error;
	ts->total_err_count += td->total_err_count;
	ts->first_error = td->first_error;
	if (!ts->error) {
	if (!td->error && td->o.continue_on_error &&
	td->first_error) {
	ts->error = td->first_error;
	ts->verror = td->verror;
	} else if (td->error) {
	ts->error = td->error;
	ts->verror = td->verror;
	}
	}

	for (l = 0; l <= DDIR_WRITE; l++) {
	sum_stat(&ts->clat_stat[l], &td->ts.clat_stat[l], idx);
	sum_stat(&ts->slat_stat[l], &td->ts.slat_stat[l], idx);
	sum_stat(&ts->lat_stat[l], &td->ts.lat_stat[l], idx);
	sum_stat(&ts->bw_stat[l], &td->ts.bw_stat[l], idx);

	ts->stat_io_bytes[l] += td->ts.stat_io_bytes[l];
	ts->io_bytes[l] += td->ts.io_bytes[l];

	if (ts->runtime[l] < td->ts.runtime[l])
	ts->runtime[l] = td->ts.runtime[l];
	}

	ts->usr_time += td->ts.usr_time;
	ts->sys_time += td->ts.sys_time;
	ts->ctx += td->ts.ctx;
	ts->majf += td->ts.majf;
	ts->minf += td->ts.minf;

	for (k = 0; k < FIO_IO_U_MAP_NR; k++)
	ts->io_u_map[k] += td->ts.io_u_map[k];
	for (k = 0; k < FIO_IO_U_MAP_NR; k++)
	ts->io_u_submit[k] += td->ts.io_u_submit[k];
	for (k = 0; k < FIO_IO_U_MAP_NR; k++)
	ts->io_u_complete[k] += td->ts.io_u_complete[k];
	for (k = 0; k < FIO_IO_U_LAT_U_NR; k++)
	ts->io_u_lat_u[k] += td->ts.io_u_lat_u[k];
	for (k = 0; k < FIO_IO_U_LAT_M_NR; k++)
	ts->io_u_lat_m[k] += td->ts.io_u_lat_m[k];


	for (k = 0; k <= 2; k++) {
	ts->total_io_u[k] += td->ts.total_io_u[k];
	ts->short_io_u[k] += td->ts.short_io_u[k];
	}

	ts->total_run_time += td->ts.total_run_time;
	ts->total_submit += td->ts.total_submit;
	ts->total_complete += td->ts.total_complete;
	}

	for (i = 0; i < nr_ts; i++) {
	unsigned long long bw;

	ts = &threadstats[i];
	rs = &runstats[ts->groupid];
	rs->kb_base = ts->kb_base;

	for (j = 0; j <= DDIR_WRITE; j++) {
	if (!ts->runtime[j])
	continue;
	if (ts->runtime[j] < rs->min_run[j] \|\| !rs->min_run[j])
	rs->min_run[j] = ts->runtime[j];
	if (ts->runtime[j] > rs->max_run[j])
	rs->max_run[j] = ts->runtime[j];

	bw = 0;
	if (ts->runtime[j]) {
	unsigned long runt;

	runt = ts->runtime[j];
	bw = ts->io_bytes[j] / runt;
	}
	if (bw < rs->min_bw[j])
	rs->min_bw[j] = bw;
	if (bw > rs->max_bw[j])
	rs->max_bw[j] = bw;

	rs->io_kb[j] += ts->io_bytes[j] / rs->kb_base;
	}
	}

	for (i = 0; i < groupid + 1; i++) {
	unsigned long max_run[2];

	rs = &runstats[i];
	max_run[0] = rs->max_run[0];
	max_run[1] = rs->max_run[1];

	if (rs->max_run[0])
	rs->agg[0] = (rs->io_kb[0] * 1000) / max_run[0];
	if (rs->max_run[1])
	rs->agg[1] = (rs->io_kb[1] * 1000) / max_run[1];
	}

	/*
	* don't overwrite last signal output
	*/
	if (!terse_output)
	log_info("\n");

	for (i = 0; i < nr_ts; i++) {
	ts = &threadstats[i];
	rs = &runstats[ts->groupid];

	if (terse_output)
	show_thread_status_terse(ts, rs);
	else
	show_thread_status(ts, rs);
	}

	if (!terse_output) {
	for (i = 0; i < groupid + 1; i++)
	show_group_stats(&runstats[i], i);

	show_disk_util();
	}

	free(runstats);
	free(threadstats);
	}

	static inline void add_stat_sample(struct io_stat *is, unsigned long data)
	{
	double val = data;
	double delta;

	if (data > is->max_val)
	is->max_val = data;
	if (data < is->min_val)
	is->min_val = data;

	delta = val - is->mean;
	if (delta) {
	is->mean += delta / (is->samples + 1.0);
	is->S += delta * (val - is->mean);
	}

	is->samples++;
	}

	static void __add_log_sample(struct io_log *iolog, unsigned long val,
	enum fio_ddir ddir, unsigned int bs,
	unsigned long t)
	{
	const int nr_samples = iolog->nr_samples;

	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[nr_samples].val = val;
	iolog->log[nr_samples].time = t;
	iolog->log[nr_samples].ddir = ddir;
	iolog->log[nr_samples].bs = bs;
	iolog->nr_samples++;
	}

	static void add_log_sample(struct thread_data td, struct io_log iolog,
	unsigned long val, enum fio_ddir ddir,
	unsigned int bs)
	{
	if (!ddir_rw(ddir))
	return;

	__add_log_sample(iolog, val, ddir, bs, mtime_since_now(&td->epoch));
	}

	void add_agg_sample(unsigned long val, enum fio_ddir ddir, unsigned int bs)
	{
	struct io_log *iolog;

	if (!ddir_rw(ddir))
	return;

	iolog = agg_io_log[ddir];
	__add_log_sample(iolog, val, ddir, bs, mtime_since_genesis());
	}

	void add_clat_sample(struct thread_data *td, enum fio_ddir ddir,
	unsigned long usec, unsigned int bs)
	{
	struct thread_stat *ts = &td->ts;

	if (!ddir_rw(ddir))
	return;

	add_stat_sample(&ts->clat_stat[ddir], usec);

	if (ts->clat_log)
	add_log_sample(td, ts->clat_log, usec, ddir, bs);
	}

	void add_slat_sample(struct thread_data *td, enum fio_ddir ddir,
	unsigned long usec, unsigned int bs)
	{
	struct thread_stat *ts = &td->ts;

	if (!ddir_rw(ddir))
	return;

	add_stat_sample(&ts->slat_stat[ddir], usec);

	if (ts->slat_log)
	add_log_sample(td, ts->slat_log, usec, ddir, bs);
	}

	void add_lat_sample(struct thread_data *td, enum fio_ddir ddir,
	unsigned long usec, unsigned int bs)
	{
	struct thread_stat *ts = &td->ts;

	if (!ddir_rw(ddir))
	return;

	add_stat_sample(&ts->lat_stat[ddir], usec);

	if (ts->lat_log)
	add_log_sample(td, ts->lat_log, usec, ddir, bs);
	}

	void add_bw_sample(struct thread_data *td, enum fio_ddir ddir, unsigned int bs,
	struct timeval *t)
	{
	struct thread_stat *ts = &td->ts;
	unsigned long spent, rate;

	if (!ddir_rw(ddir))
	return;

	spent = mtime_since(&ts->stat_sample_time[ddir], t);
	if (spent < td->o.bw_avg_time)
	return;

	rate = (td->this_io_bytes[ddir] - ts->stat_io_bytes[ddir]) *
	1000 / spent / 1024;
	add_stat_sample(&ts->bw_stat[ddir], rate);

	if (ts->bw_log)
	add_log_sample(td, ts->bw_log, rate, ddir, bs);

	fio_gettime(&ts->stat_sample_time[ddir], NULL);
	ts->stat_io_bytes[ddir] = td->this_io_bytes[ddir];
	}