Hi! I'm afraid that `nproc` shows only the number of _currently_ online CPUs, which on mobile processors tends to be 1 when starting a job. As there's a need to conserve power, holding cores online when they have nothing to do would be a waste, thus they constantly get onlined and offlined.
For example, on a 10-core box where the processor consists of three clusters, 4+4+2 cores, topline graph shows: (oooo▁▁▁ oo) (oooo▁ ▁ oo) (▃ooooooooo) (oooo▁▁▁▁oo) (▂ooooooooo) (oooo▁▁▁ oo) (oooo▁ ▁ oo) (oooo▁▁ oo) (oooo▁ ▁oo) (oooo▁▁ oo) (oooo▁ oo) (1 line = 1 second, "o" means offline core, otherwise it's utilization level.) Because of noisy GUI (that eg. draws this very graph), the machine keeps flipping between onlining just CPU 0, or a cluster of CPU4..7. Thus, `nproc` will randomly says either "1" or "4", while the user expects to run her compile with all 10 cores. I found out that numa_num_task_cpus() from libnuma gets the right answer, handling both affinity mask and CPUs present-but-currently-offline. But alas, it doesn't provide a command-line tool, and thousands of scripts already use nproc, thus switching a tool would be a waste of effort. Ie, could you please make nproc include all available CPUs rather than only online ones? Meow! -- ⢀⣴⠾⠻⢶⣦⠀ ⣾⠁⢠⠒⠀⣿⡁ in the beginning was the boot and root floppies and they were good. ⢿⡄⠘⠷⠚⠋⠀ -- <willmore> on #linux-sunxi ⠈⠳⣄⠀⠀⠀⠀
