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The runtime answers like libuv 1.51's uv_available_parallelism, which Node's os.availableParallelism() returns: on Linux the CPUs in the process's affinity mask, lowered to a smaller cgroup (v2 cpu.max or v1 CFS) CPU quota; on Darwin hw.activecpu, hw.logicalcpu or hw.ncpu; on Windows GetSystemInfo's processor count; at least 1. WASI answers 1, as the dynamic island does. Parallel programs (tsc-ts --checkers) need it to size their thread pools. Corpus 4598 pins the value against the host's Node.
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| sscanf(value, "%lld %lld", &limit, &period) == 2 && period != 0) | ||
| *quota = limit / period; |
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cgroup v2 CPU quota rounding down to 0 (sub-1-CPU container limit) is dropped instead of clamped to 1, so os.availableParallelism() diverges from Node/libuv in exactly the containerized case the feature targets.
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Adds
os.availableParallelism()to static-native programs, matching Node/libuv: the CPU affinity mask, reduced by the cgroup CPU quota on Linux, and the logical CPU count elsewhere. Verified against Node on macOS and on Linux under affinity 0-7, 0-31 and 3. tsc-ts uses it to size its parse threads and pick a default checker count (TSC_TS_CHECKERS=auto). New corpus program4598-os-available-parallelism; Node compatibility manifests regenerated. Stacked on #830.