gen.py started one emit worker per CPU, about 1.3 GiB each on 1.4.3, so many-core machines with modest RAM died with a MemoryError during "Translating code to C" (issues 17, 28, probably 66). The default is now min(CPU count, 80% of the free physical memory / 1.5 GiB), at least 1, capped by the memory limit of the enclosing job object if there is one. --jobs still overrides it, and the chosen count and its reason are logged. The memory helper is tools/hostmem.py, shipped with the release tools.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
