Expand description
Low-level benchmark utility for measuring DSP processor CPU cost.
LatencyAnalyzer provides the timing primitives used by
AudioLatencyMeasurementService to derive per-processor execution costs.
It is intentionally a pure measurement tool with no knowledge of audio routing
or the service layer.
§Methodology
Both functions run the processor (or a zero-work passthrough) over
iterations × block_size samples, alternating between +0.5 and -0.5 inputs to
exercise any branch-dependent code paths. std::hint::black_box is used on each
output to prevent the compiler from optimising the loop body away.
The net cost reported by measure_effect_added_execution_us is:
net_us_per_sample = max(effect_us_per_sample − passthrough_us_per_sample, 0)Clamping to ≥ 0 prevents occasional negative readings caused by CPU scheduling
noise on the passthrough run.
Structs§
- Latency
Analyzer - Stateless benchmark utility for measuring DSP processor CPU execution cost.