[dpdk-dev] [PATCH v3 4/6] test/spinlock: amortize the cost of getting time
Gavin Hu
gavin.hu at arm.com
Thu Dec 27 05:13:47 CET 2018
Instead of getting timestamps per iteration, amortize its overhead
can help getting more precise benchmarking results.
Signed-off-by: Gavin Hu <gavin.hu at arm.com>
Reviewed-by: Joyce Kong <Joyce.Kong at arm.com>
---
test/test/test_spinlock.c | 28 +++++++++++++++-------------
1 file changed, 15 insertions(+), 13 deletions(-)
diff --git a/test/test/test_spinlock.c b/test/test/test_spinlock.c
index 648474833..e9839b979 100644
--- a/test/test/test_spinlock.c
+++ b/test/test/test_spinlock.c
@@ -96,9 +96,9 @@ test_spinlock_recursive_per_core(__attribute__((unused)) void *arg)
}
static rte_spinlock_t lk = RTE_SPINLOCK_INITIALIZER;
-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(void *func_param)
@@ -114,15 +114,14 @@ load_loop_fn(void *func_param)
while (rte_atomic32_read(&synchro) == 0);
begin = rte_rdtsc_precise();
- while (time_diff < hz * TIME_MS / 1000) {
+ while (lcount < MAX_LOOP) {
if (use_lock)
rte_spinlock_lock(&lk);
- lcount++;
if (use_lock)
rte_spinlock_unlock(&lk);
- 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;
}
@@ -136,14 +135,16 @@ test_spinlock_perf(void)
printf("\nTest with no lock on single core...\n");
load_loop_fn(&lock);
- printf("Core [%u] count = %"PRIu64"\n", lcore, lock_count[lcore]);
- memset(lock_count, 0, sizeof(lock_count));
+ printf("Core [%u] Cost Time = %"PRIu64" us\n", lcore,
+ time_count[lcore]);
+ memset(time_count, 0, sizeof(time_count));
printf("\nTest with lock on single core...\n");
lock = 1;
load_loop_fn(&lock);
- printf("Core [%u] count = %"PRIu64"\n", lcore, lock_count[lcore]);
- memset(lock_count, 0, sizeof(lock_count));
+ printf("Core [%u] Cost Time = %"PRIu64" us\n", lcore,
+ time_count[lcore]);
+ memset(time_count, 0, sizeof(time_count));
printf("\nTest with lock on %u cores...\n", rte_lcore_count());
@@ -158,11 +159,12 @@ test_spinlock_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);
return 0;
}
--
2.11.0
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