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sys/benchmark: warm up cache #21407

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19 changes: 19 additions & 0 deletions sys/include/benchmark.h
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Original file line number Diff line number Diff line change
Expand Up @@ -42,8 +42,27 @@ extern "C" {
* @param[in] func function call to benchmark
*/
#define BENCHMARK_FUNC(name, runs, func) \
BENCHMARK_FUNC_WARMUP(name, 0, runs, func)

/**
* @brief Measure the runtime of a given function call
*
* Same as @ref BENCHMARK_FUNC, but do a few warmup iterations before starting
* the benchmark to warm up the dynamic branch predictor state and caches.
*
* @param[in] name name for labeling the output
* @param[in] warmup number of times to run @p func before the benchmark
* @param[in] runs number of times to run @p func during the benchmark
* @param[in] func function call to benchmark
*/
#define BENCHMARK_FUNC_WARMUP(name, warmup, runs, func) \
do { \
ztimer_stopwatch_t timer = { .clock = ZTIMER_USEC }; \
/* warm up cache, branch predictor, ... */ \
unsigned long _warmup = warmup; \
while (_warmup--) { \
func; \
} \
ztimer_stopwatch_start(&timer); \
for (unsigned long i = 0; i < runs; i++) { \
func; \
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