RIOT/tests/bench/sys_atomic_utils

Benchmark for sys/atomic_utils

This application will perform 100.000 repetitions (or 1.000.000 on Cortex-M7 and ESP32) for each atomic operation and will print the total time it took in a table. For comparison, the speed of C11 atomics and plain volatile accesses are also printed.

Expectations

Lower is better!

Plain volatile accesses are not atomic, and therefore should perform faster than actual atomic operations. If atomic operations turn out to be faster (by more than rounding errors and noise), something is odd.

The atomic_utils aim to be at least as fast as C11 atomics and often faster. If the atomic_utils implementation performs slower than C11 atomics, you have found potential for further optimization.