[PATCH] Fix deviation overflow

[fio.git] / stat.c

diff --git a/stat.c b/stat.c
index e6da4218ad9214f2741ca09142ce288c82101911..068aa923e7203e2996ade5a5d857d6189339d3a7 100644 (file)
--- a/stat.c
+++ b/stat.c
@@ -258,9 +258,6 @@ void disk_util_timer_arm(void)
 
 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);
@@ -274,7 +271,7 @@ 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;
+       double n, o;
 
        if (is->samples == 0)
                return 0;
@@ -284,7 +281,16 @@ static int calc_lat(struct io_stat *is, unsigned long *min, unsigned long *max,
 
        n = (double) is->samples;
        *mean = (double) is->val / n;
-       *dev = sqrt(((double) is->val_sq - (*mean * *mean) / n) / (n - 1));
+       *dev = 0.01;
+
+       if (n <= 1.0)
+               return 1;
+
+       o = (double) is->val_sq - ((*mean * *mean) / n);
+       if (o < 0.0)
+               *dev = -1.0;
+       else
+               *dev = sqrt(o / (n - 1.0));
 
        return 1;
 }
@@ -362,6 +368,7 @@ static void show_thread_status(struct thread_data *td,
                               struct group_run_stats *rs)
 {
        double usr_cpu, sys_cpu;
+       unsigned long runtime;
 
        if (!(td->io_bytes[0] + td->io_bytes[1]) && !td->error)
                return;
@@ -372,8 +379,9 @@ static void show_thread_status(struct thread_data *td,
        if (td->io_bytes[td->ddir ^ 1])
                show_ddir_status(td, rs, td->ddir ^ 1);
 
-       if (td->runtime[0] + td->runtime[1]) {
-               double runt = td->runtime[0] + td->runtime[1];
+       runtime = mtime_since(&td->epoch, &td->end_time);
+       if (runtime) {
+               double runt = (double) runtime;
 
                usr_cpu = (double) td->usr_time * 100 / runt;
                sys_cpu = (double) td->sys_time * 100 / runt;
@@ -430,7 +438,7 @@ static void show_thread_status_terse(struct thread_data *td,
        show_ddir_status_terse(td, rs, 1);
 
        if (td->runtime[0] + td->runtime[1]) {
-               double runt = td->runtime[0] + td->runtime[1];
+               double runt = (double) (td->runtime[0] + td->runtime[1]);
 
                usr_cpu = (double) td->usr_time * 100 / runt;
                sys_cpu = (double) td->sys_time * 100 / runt;
@@ -543,7 +551,7 @@ static inline void add_stat_sample(struct io_stat *is, unsigned long val)
 }
 
 static void add_log_sample(struct thread_data *td, struct io_log *iolog,
-                          unsigned long val, int ddir)
+                          unsigned long val, enum fio_ddir ddir)
 {
        if (iolog->nr_samples == iolog->max_samples) {
                int new_size = sizeof(struct io_sample) * iolog->max_samples*2;
@@ -558,7 +566,8 @@ static void add_log_sample(struct thread_data *td, struct io_log *iolog,
        iolog->nr_samples++;
 }
 
-void add_clat_sample(struct thread_data *td, int ddir, unsigned long msec)
+void add_clat_sample(struct thread_data *td, enum fio_ddir ddir,
+                    unsigned long msec)
 {
        add_stat_sample(&td->clat_stat[ddir], msec);
 
@@ -566,7 +575,8 @@ void add_clat_sample(struct thread_data *td, int ddir, unsigned long msec)
                add_log_sample(td, td->clat_log, msec, ddir);
 }
 
-void add_slat_sample(struct thread_data *td, int ddir, unsigned long msec)
+void add_slat_sample(struct thread_data *td, enum fio_ddir ddir,
+                    unsigned long msec)
 {
        add_stat_sample(&td->slat_stat[ddir], msec);
 
@@ -574,7 +584,8 @@ void add_slat_sample(struct thread_data *td, int ddir, unsigned long msec)
                add_log_sample(td, td->slat_log, msec, ddir);
 }
 
-void add_bw_sample(struct thread_data *td, int ddir, struct timeval *t)
+void add_bw_sample(struct thread_data *td, enum fio_ddir ddir,
+                  struct timeval *t)
 {
        unsigned long spent = mtime_since(&td->stat_sample_time[ddir], t);
        unsigned long rate;