Available CPU

This project tries to find a safe cross-platform way of determining how many physical CPUs there are available in a CI environment. The intention is to use this in Jest to automatically select the most performant amount of workers to spawn

Results

Results from running on different CIs are:

CI	cpus().length	physical-cpu-count	manual with nproc/sysctl/env	actual
travis (linux)	32 💥	16 💥	2 ✅	2
travis (mac)	2 ✅	2 ✅	2 ✅	2
travis (windows)	2 ✅	1 💥	2 ✅	2
Circle	32 💥	16 💥	32 💥	2
Appveyor	2 ✅	1 💥	2 ✅	2
GitHub Actions (linux)	2 ✅	2 ✅	2 ✅	2
GitHub Actions (mac)	4 ✅	4 ✅	4 ✅	4
GitHub Actions (windows)	2 ✅	1 💥	2 ✅	2
Axure Pipelines (linux)	2 ✅	2 ✅	2 ✅	2
Axure Pipelines (mac)	4 ✅	4 ✅	4 ✅	4
Axure Pipelines (windows)	2 ✅	1 💥	2 ✅	2