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/*
* SPDX-License-Identifier: GPL-2.0-only
*
* SPDX-FileCopyrightText: 2025 Olivier Dion <odion@efficios.com>.
*
* test_uatomic.c - Trivial micro-benchmark of the uatomic API.
*
* The benchmark will print a summary like so:
*
* memory-order: CMM_RELAXED
* uatomic_load_mo: 0.119530
* uatomic_store_mo: 0.129159
* uatomic_xchg_mo: 1.832290
* uatomic_cmpxchg_mo: 1.796460
* memory-order: CMM_SEQ_CST
* uatomic_load_mo: 0.206869
* uatomic_store_mo: 1.591636
* uatomic_xchg_mo: 1.600575
* uatomic_cmpxchg_mo: 1.800107
* memory-order: CMM_SEQ_CST_FENCE
* uatomic_load_mo: 1.512201
* uatomic_store_mo: 1.590643
* uatomic_xchg_mo: 1.596536
* uatomic_cmpxchg_mo: 1.801630
*
* The values are nanoseconds per operation.
*/
#include <stdio.h>
#include <time.h>
#include <urcu/uatomic.h>
#define NSEC_PER_SEC 1000000000UL
/*
* Average of 1 billion operations.
*/
#define LOOP_COUNT 1000000000UL
static uint64_t gettime(void)
{
struct timespec ts;
clock_gettime(CLOCK_MONOTONIC, &ts);
return (uint64_t)ts.tv_sec * NSEC_PER_SEC + ts.tv_nsec;
}
#define RUN_TEST(OP, ...) \
({ \
uint64_t then, now; \
long value; \
then = gettime(); \
for (size_t k = 0; k < LOOP_COUNT; ++k) { \
OP(&value, ##__VA_ARGS__); \
} \
now = gettime(); \
printf("%s: %.6f\n", #OP, (now - then) / (double)LOOP_COUNT); \
})
#define RUN_TESTS(MO) \
do { \
printf("memory-order: " #MO "\n"); \
RUN_TEST(uatomic_load_mo, MO); \
RUN_TEST(uatomic_store_mo, 0, MO); \
RUN_TEST(uatomic_xchg_mo, 0, MO); \
RUN_TEST(uatomic_cmpxchg_mo, 0, 0, MO, MO); \
} while (0)
int main(void)
{
RUN_TESTS(CMM_RELAXED);
RUN_TESTS(CMM_SEQ_CST);
RUN_TESTS(CMM_SEQ_CST_FENCE);
return 0;
}
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