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/* SPDX-License-Identifier: BSD-3-Clause
* Copyright(c) 2019 Ericsson AB
*/
#include <inttypes.h>
#include <stdio.h>
#include <rte_common.h>
#include <rte_cycles.h>
#include <rte_random.h>
#include "test.h"
static volatile uint64_t vsum;
#define ITERATIONS (100000000)
#define BEST_CASE_BOUND (1<<16)
#define WORST_CASE_BOUND (BEST_CASE_BOUND + 1)
enum rand_type {
rand_type_64,
rand_type_bounded_best_case,
rand_type_bounded_worst_case
};
static const char *
rand_type_desc(enum rand_type rand_type)
{
switch (rand_type) {
case rand_type_64:
return "Full 64-bit [rte_rand()]";
case rand_type_bounded_best_case:
return "Bounded average best-case [rte_rand_max()]";
case rand_type_bounded_worst_case:
return "Bounded average worst-case [rte_rand_max()]";
default:
return NULL;
}
}
static __rte_always_inline void
test_rand_perf_type(enum rand_type rand_type)
{
uint64_t start;
uint32_t i;
uint64_t end;
uint64_t sum = 0;
uint64_t op_latency;
start = rte_rdtsc();
for (i = 0; i < ITERATIONS; i++) {
switch (rand_type) {
case rand_type_64:
sum += rte_rand();
break;
case rand_type_bounded_best_case:
sum += rte_rand_max(BEST_CASE_BOUND);
break;
case rand_type_bounded_worst_case:
sum += rte_rand_max(WORST_CASE_BOUND);
break;
}
}
end = rte_rdtsc();
/* to avoid an optimizing compiler removing the whole loop */
vsum = sum;
op_latency = (end - start) / ITERATIONS;
printf("%s: %"PRId64" TSC cycles/op\n", rand_type_desc(rand_type),
op_latency);
}
static int
test_rand_perf(void)
{
rte_srand(42);
printf("Pseudo-random number generation latencies:\n");
test_rand_perf_type(rand_type_64);
test_rand_perf_type(rand_type_bounded_best_case);
test_rand_perf_type(rand_type_bounded_worst_case);
return 0;
}
REGISTER_TEST_COMMAND(rand_perf_autotest, test_rand_perf);
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