README

Measures the front of the export pipeline: SpanProcessor.process runs priority and span sampling, then spanFormat turns each finished span into its wire shape. A no-op exporter receives the formatted chunk so the loop stays CPU-bound with flat memory.

The encoder and the agent socket are out of scope on purpose: encoding covers the encoder, and the real flush is a deferred unref'd timer that barely fires in a short run. Variants toggle the stats (DSM) path and the span-links/events formatting path, both of which run in process.