available_parallelism() put ggml workers on Meteor Lake LP E-cores; every
per-node spin barrier then waits on the slowest worker while the rest burn
CPU: RTF ~22 at 14 threads vs 0.28 at 4 threads (~80x), same build. This
was the real W1 CPU-pathology root cause; /Od-vs-/O2 made no difference.
4 matches whisper.cpp upstream default and is the CPU-frugal choice
(NFR-RES-1). WA_WHISPER_THREADS env overrides for support/bench.
iamdoubz
0d2eee7416