t/aio-ring: add cache hit statistics

[fio.git] / t / aio-ring.c

diff --git a/t/aio-ring.c b/t/aio-ring.c
index 322f2ffa23e344bebf7a4956c306af848298ca1d..c813c4e7f1de1283c49cd0dc80c19b3bb9274bea 100644 (file)
--- a/t/aio-ring.c
+++ b/t/aio-ring.c
@@ -30,6 +30,8 @@
 #define IOCTX_FLAG_SQTHREAD    (1 << 3)        /* Use SQ thread */
 #define IOCTX_FLAG_SQWQ                (1 << 4)        /* Use SQ wq */
 
+#define IOEV_RES2_CACHEHIT     (1 << 0)
+
 #define barrier()      __asm__ __volatile__("": : :"memory")
 
 #define min(a, b)              ((a < b) ? (a) : (b))
@@ -87,6 +89,7 @@ struct submitter {
        unsigned long reaps;
        unsigned long done;
        unsigned long calls;
+       unsigned long cachehit, cachemiss;
        volatile int finish;
        char filename[128];
 };
@@ -206,6 +209,10 @@ static int reap_events(struct submitter *s)
                        printf("offset=%lu, size=%lu\n", (unsigned long) iocb->u.c.offset, (unsigned long) iocb->u.c.nbytes);
                        return -1;
                }
+               if (ev->res2 & IOEV_RES2_CACHEHIT)
+                       s->cachehit++;
+               else
+                       s->cachemiss++;
                reaped++;
                head++;
                if (head == ring->nr_events)
@@ -333,7 +340,7 @@ static void arm_sig_int(void)
 int main(int argc, char *argv[])
 {
        struct submitter *s = &submitters[0];
-       unsigned long done, calls, reap;
+       unsigned long done, calls, reap, cache_hit, cache_miss;
        int flags = 0, err;
        int j;
        size_t size;
@@ -410,27 +417,42 @@ int main(int argc, char *argv[])
 
        pthread_create(&s->thread, NULL, submitter_fn, s);
 
-       reap = calls = done = 0;
+       cache_hit = cache_miss = reap = calls = done = 0;
        do {
                unsigned long this_done = 0;
                unsigned long this_reap = 0;
                unsigned long this_call = 0;
+               unsigned long this_cache_hit = 0;
+               unsigned long this_cache_miss = 0;
                unsigned long rpc = 0, ipc = 0;
+               double hit = 0.0;
 
                sleep(1);
                this_done += s->done;
                this_call += s->calls;
                this_reap += s->reaps;
+               this_cache_hit += s->cachehit;
+               this_cache_miss += s->cachemiss;
+               if (this_cache_hit && this_cache_miss) {
+                       unsigned long hits, total;
+
+                       hits = this_cache_hit - cache_hit;
+                       total = hits + this_cache_miss - cache_miss;
+                       hit = (double) hits / (double) total;
+                       hit *= 100.0;
+               }
                if (this_call - calls) {
                        rpc = (this_done - done) / (this_call - calls);
                        ipc = (this_reap - reap) / (this_call - calls);
                }
-               printf("IOPS=%lu, IOS/call=%lu/%lu, inflight=%u (head=%d tail=%d), %lu, %lu\n",
+               printf("IOPS=%lu, IOS/call=%lu/%lu, inflight=%u (head=%d tail=%d), Cachehit=%0.2f%%\n",
                                this_done - done, rpc, ipc, s->inflight,
-                               s->cq_ring->head, s->cq_ring->tail, s->reaps, s->done);
+                               s->cq_ring->head, s->cq_ring->tail, hit);
                done = this_done;
                calls = this_call;
                reap = this_reap;
+               cache_hit = s->cachehit;
+               cache_miss = s->cachemiss;
        } while (!finish);
 
        pthread_join(s->thread, &ret);