[dpdk-dev] [PATCH v2 3/3] test/rwlock: amortize the cost of getting time
Joyce Kong
joyce.kong at arm.com
Tue Jan 15 14:12:59 CET 2019
Fixes: af75078fece3 ("first public release")
Cc: stable at dpdk.org
Signed-off-by: Joyce Kong <joyce.kong at arm.com>
---
test/test/test_rwlock.c | 18 ++++++++++--------
1 file changed, 10 insertions(+), 8 deletions(-)
diff --git a/test/test/test_rwlock.c b/test/test/test_rwlock.c
index 250ea5a..d42ac35 100644
--- a/test/test/test_rwlock.c
+++ b/test/test/test_rwlock.c
@@ -86,9 +86,9 @@ test_rwlock_per_core(__attribute__((unused)) void *arg)
static rte_rwlock_t lk = RTE_RWLOCK_INITIALIZER;
static volatile uint64_t rwlock_data;
-static uint64_t lock_count[RTE_MAX_LCORE] = {0};
+static uint64_t time_count[RTE_MAX_LCORE] = {0};
-#define TIME_MS 100
+#define MAX_LOOP 10000
static int
load_loop_fn(__attribute__((unused)) void *arg)
@@ -104,7 +104,7 @@ load_loop_fn(__attribute__((unused)) void *arg)
;
begin = rte_rdtsc_precise();
- while (time_diff < hz * TIME_MS / 1000) {
+ while (lcount < MAX_LOOP) {
rte_rwlock_write_lock(&lk);
++rwlock_data;
rte_rwlock_write_unlock(&lk);
@@ -117,10 +117,10 @@ load_loop_fn(__attribute__((unused)) void *arg)
lcount++;
/* delay to make lock duty cycle slightly realistic */
rte_pause();
- time_diff = rte_rdtsc_precise() - begin;
}
- lock_count[lcore] = lcount;
+ time_diff = rte_rdtsc_precise() - begin;
+ time_count[lcore] = time_diff * 1000000 / hz;
return 0;
}
@@ -144,11 +144,13 @@ test_rwlock_perf(void)
rte_eal_mp_wait_lcore();
RTE_LCORE_FOREACH(i) {
- printf("Core [%u] count = %"PRIu64"\n", i, lock_count[i]);
- total += lock_count[i];
+ printf("Core [%u] cost time = %"PRIu64" us\n",
+ i, time_count[i]);
+ total += time_count[i];
}
- printf("Total count = %"PRIu64"\n", total);
+ printf("Total cost time = %"PRIu64" us\n", total);
+ memset(time_count, 0, sizeof(time_count));
return 0;
}
--
2.7.4
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