app/regex: measure performance with precise clock

Performance measurement (elapsed time and Gbps) are based on Linux
clock() API. The resolution is improved by replacing the clock() API
with rte_rdtsc_precise() API.

Signed-off-by: Ophir Munk <ophirmu@nvidia.com>
Acked-by: Ori Kam <orika@nvidia.com>

diff --git a/app/test-regex/main.c b/app/test-regex/main.c
index 2fce55d..aea4fa6 100644 (file)
--- a/app/test-regex/main.c
+++ b/app/test-regex/main.c
@@ -48,8 +48,8 @@ struct qp_params {
        struct rte_regex_ops **ops;
        struct job_ctx *jobs_ctx;
        char *buf;
-       time_t start;
-       time_t end;
+       uint64_t start;
+       uint64_t cycles;
 };
 
 struct qps_per_lcore {
@@ -326,7 +326,7 @@ run_regex(void *args)
        unsigned long d_ind = 0;
        struct rte_mbuf_ext_shared_info shinfo;
        int res = 0;
-       double time;
+       long double time;
        struct rte_mempool *mbuf_mp;
        struct qp_params *qp;
        struct qp_params *qps = NULL;
@@ -419,7 +419,7 @@ run_regex(void *args)
                qp->buf = buf;
                qp->total_matches = 0;
                qp->start = 0;
-               qp->end = 0;
+               qp->cycles = 0;
        }
 
        for (i = 0; i < nb_iterations; i++) {
@@ -432,9 +432,8 @@ run_regex(void *args)
                        update = false;
                        for (qp_id = 0; qp_id < nb_qps; qp_id++) {
                                qp = &qps[qp_id];
-                               if (!qp->start)
-                                       qp->start = clock();
                                if (qp->total_dequeue < actual_jobs) {
+                                       qp->start = rte_rdtsc_precise();
                                        struct rte_regex_ops **
                                                cur_ops_to_enqueue = qp->ops +
                                                qp->total_enqueue;
@@ -463,25 +462,21 @@ run_regex(void *args)
                                                        cur_ops_to_dequeue,
                                                        qp->total_enqueue -
                                                        qp->total_dequeue);
+                                       qp->cycles +=
+                                            (rte_rdtsc_precise() - qp->start);
                                        update = true;
-                               } else {
-                                       if (!qp->end)
-                                               qp->end = clock();
                                }
-
                        }
                } while (update);
        }
        for (qp_id = 0; qp_id < nb_qps; qp_id++) {
                qp = &qps[qp_id];
-               time = ((double)qp->end - qp->start) / CLOCKS_PER_SEC;
-               printf("Core=%u QP=%u\n", rte_lcore_id(), qp_id + qp_id_base);
-               printf("Job len = %ld Bytes\n",  job_len);
-               printf("Time = %lf sec\n",  time);
-               printf("Perf = %lf Gbps\n\n",
-                               (((double)actual_jobs * job_len *
-                               nb_iterations * 8) / time) /
-                               1000000000.0);
+               time = (long double)qp->cycles / rte_get_timer_hz();
+               printf("Core=%u QP=%u Job=%ld Bytes Time=%Lf sec Perf=%Lf "
+                      "Gbps\n", rte_lcore_id(), qp_id + qp_id_base,
+                      job_len, time,
+                      (((double)actual_jobs * job_len * nb_iterations * 8)
+                      / time) / 1000000000.0);
        }
 
        if (rgxc->perf_mode)