[PATCH] Include io depth distribution statistics

[fio.git] / stat.c

diff --git a/stat.c b/stat.c
index 6e7c23570bf88836e8b1911aa7719c1a1e8581ef..b4806e0e8c48dfb5557be2f4abcdf31bf4ed41e1 100644 (file)
--- a/stat.c
+++ b/stat.c
@@ -275,7 +275,6 @@ void update_rusage_stat(struct thread_data *td)
        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));
 }
@@ -283,7 +282,7 @@ void update_rusage_stat(struct thread_data *td)
 static int calc_lat(struct io_stat *is, unsigned long *min, unsigned long *max,
                    double *mean, double *dev)
 {
-       double n, o;
+       double n = is->samples;
 
        if (is->samples == 0)
                return 0;
@@ -292,17 +291,12 @@ static int calc_lat(struct io_stat *is, unsigned long *min, unsigned long *max,
        *max = is->max_val;
 
        n = (double) is->samples;
-       *mean = (double) is->val / n;
-       *dev = 0.01;
-
-       if (n <= 1.0)
-               return 1;
+       *mean = is->mean;
 
-       o = ((double) is->val_sq - (*mean * is->val)) / n;
-       if (o < 0.0)
-               *dev = -1.0;
+       if (n > 1.0)
+               *dev = sqrt(is->S / (n - 1.0));
        else
-               *dev = sqrt(o);
+               *dev = -1.0;
 
        return 1;
 }
@@ -363,16 +357,16 @@ static void show_ddir_status(struct thread_data *td, struct group_run_stats *rs,
        fprintf(f_out, "  %s: io=%6lluMiB, bw=%6lluKiB/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))
-               fprintf(f_out, "    slat (msec): min=%5lu, max=%5lu, avg=%5.02f, dev=%5.02f\n", min, max, mean, dev);
+               fprintf(f_out, "    slat (msec): min=%5lu, max=%5lu, avg=%5.02f, stdev=%5.02f\n", min, max, mean, dev);
 
        if (calc_lat(&td->clat_stat[ddir], &min, &max, &mean, &dev))
-               fprintf(f_out, "    clat (msec): min=%5lu, max=%5lu, avg=%5.02f, dev=%5.02f\n", min, max, mean, dev);
+               fprintf(f_out, "    clat (msec): min=%5lu, max=%5lu, avg=%5.02f, stdev=%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];
-               fprintf(f_out, "    bw (KiB/s) : min=%5lu, max=%5lu, per=%3.2f%%, avg=%5.02f, dev=%5.02f\n", min, max, p_of_agg, mean, dev);
+               fprintf(f_out, "    bw (KiB/s) : min=%5lu, max=%5lu, per=%3.2f%%, avg=%5.02f, stdev=%5.02f\n", min, max, p_of_agg, mean, dev);
        }
 }
 
@@ -381,6 +375,8 @@ static void show_thread_status(struct thread_data *td,
 {
        double usr_cpu, sys_cpu;
        unsigned long runtime;
+       double io_u_dist[FIO_IO_U_MAP_NR];
+       int i;
 
        if (!(td->io_bytes[0] + td->io_bytes[1]) && !td->error)
                return;
@@ -403,6 +399,16 @@ static void show_thread_status(struct thread_data *td,
        }
 
        fprintf(f_out, "  cpu          : usr=%3.2f%%, sys=%3.2f%%, ctx=%lu\n", usr_cpu, sys_cpu, td->ctx);
+
+       /*
+        * Do depth distribution calculations
+        */
+       for (i = 0; i < FIO_IO_U_MAP_NR; i++) {
+               io_u_dist[i] = (double) td->io_u_map[i] / (double) td->total_io_u;
+               io_u_dist[i] *= 100.0;
+       }
+
+       fprintf(f_out, "  IO depths    : 1=%3.1f%%, 2=%3.1f%%, 4=%3.1f%%, 8=%3.1f%%, 16=%3.1f%%, 32=%3.1f%%, >32=%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]);
 }
 
 static void show_ddir_status_terse(struct thread_data *td,
@@ -550,15 +556,21 @@ void show_run_stats(void)
        free(runstats);
 }
 
-static inline void add_stat_sample(struct io_stat *is, unsigned long val)
+static inline void add_stat_sample(struct io_stat *is, unsigned long data)
 {
-       if (val > is->max_val)
-               is->max_val = val;
-       if (val < is->min_val)
-               is->min_val = val;
+       double val = data;
+       double delta, n;
+
+       if (data > is->max_val)
+               is->max_val = data;
+       if (data < is->min_val)
+               is->min_val = data;
+
+       delta = val - is->mean;
+       n = is->samples + 1.0;
+       is->mean += delta / n;
+       is->S += delta * (val - is->mean);
 
-       is->val += val;
-       is->val_sq += val * val;
        is->samples++;
 }