Add cache hit stats

[fio.git] / stat.c

diff --git a/stat.c b/stat.c
index 887509fe0a104a0f6b0ae804d33fcfc4026c82b3..ec75de241be623756c88c1b88edb69473a0dfb97 100644 (file)
--- a/stat.c
+++ b/stat.c
@@ -419,7 +419,7 @@ static void show_ddir_status(struct group_run_stats *rs, struct thread_stat *ts,
        unsigned long runt;
        unsigned long long min, max, bw, iops;
        double mean, dev;
-       char *io_p, *bw_p, *bw_p_alt, *iops_p, *zbd_w_st = NULL;
+       char *io_p, *bw_p, *bw_p_alt, *iops_p, *post_st = NULL;
        int i2p;
 
        if (ddir_sync(ddir)) {
@@ -451,15 +451,25 @@ static void show_ddir_status(struct group_run_stats *rs, struct thread_stat *ts,
        iops = (1000 * (uint64_t)ts->total_io_u[ddir]) / runt;
        iops_p = num2str(iops, ts->sig_figs, 1, 0, N2S_NONE);
        if (ddir == DDIR_WRITE)
-               zbd_w_st = zbd_write_status(ts);
+               post_st = zbd_write_status(ts);
+       else if (ddir == DDIR_READ && ts->cachehit && ts->cachemiss) {
+               uint64_t total;
+               double hit;
+
+               total = ts->cachehit + ts->cachemiss;
+               hit = (double) ts->cachehit / (double) total;
+               hit *= 100.0;
+               if (asprintf(&post_st, "; Cachehit=%0.2f%%", hit) < 0)
+                       post_st = NULL;
+       }
 
        log_buf(out, "  %s: IOPS=%s, BW=%s (%s)(%s/%llumsec)%s\n",
                        rs->unified_rw_rep ? "mixed" : io_ddir_name(ddir),
                        iops_p, bw_p, bw_p_alt, io_p,
                        (unsigned long long) ts->runtime[ddir],
-                       zbd_w_st ? : "");
+                       post_st ? : "");
 
-       free(zbd_w_st);
+       free(post_st);
        free(io_p);
        free(bw_p);
        free(bw_p_alt);
@@ -1153,6 +1163,16 @@ static void add_ddir_status_json(struct thread_stat *ts,
        json_object_add_value_float(dir_object, "iops_stddev", dev);
        json_object_add_value_int(dir_object, "iops_samples",
                                (&ts->iops_stat[ddir])->samples);
+
+       if (ts->cachehit + ts->cachemiss) {
+               uint64_t total;
+               double hit;
+
+               total = ts->cachehit + ts->cachemiss;
+               hit = (double) ts->cachehit / (double) total;
+               hit *= 100.0;
+               json_object_add_value_float(dir_object, "cachehit", hit);
+       }
 }
 
 static void show_thread_status_terse_all(struct thread_stat *ts,
@@ -1695,6 +1715,8 @@ void sum_thread_stats(struct thread_stat *dst, struct thread_stat *src,
        dst->total_submit += src->total_submit;
        dst->total_complete += src->total_complete;
        dst->nr_zone_resets += src->nr_zone_resets;
+       dst->cachehit += src->cachehit;
+       dst->cachemiss += src->cachemiss;
 }
 
 void init_group_run_stat(struct group_run_stats *gs)
@@ -2376,6 +2398,7 @@ void reset_io_stats(struct thread_data *td)
        ts->total_submit = 0;
        ts->total_complete = 0;
        ts->nr_zone_resets = 0;
+       ts->cachehit = ts->cachemiss = 0;
 }
 
 static void __add_stat_to_log(struct io_log *iolog, enum fio_ddir ddir,