let j_msg = format!(
"number of jobs to run in parallel; \
defaults to {} (this host's logical CPU count)",
- std::thread::available_parallelism().map_or(1, std::num::NonZeroUsize::get)
+ num_cpus::get()
);
opts.optopt("j", "jobs", &j_msg, "JOBS");
opts.optflag("h", "help", "print this help message");