#!/usr/bin/env bash

sisyphusConfigDir="/etc/sisyphus"

setjobs () {
	# default MAKEOPTS value is -j64, but that's overkill for lower spec machines
	# this will adjust MAKEOPTS to a value detected by $(getconf _NPROCESSORS_ONLN)
	# however since compilation is largely pointer-following, SMT won't help much
	# and can lead to memory starvation and stalls; DO NOT use logical cores
	if [[ $(cat /sys/devices/system/cpu/smt/active) -eq 1 ]]; then
		sed -i "s/\-j\([0-9]\+\)/\-j$(expr $(getconf _NPROCESSORS_ONLN) / 2)/g" "$sisyphusConfigDir"/sisyphus.make-opts.conf >/dev/null 2>&1 # global makeopts
	elif [[ $(cat /sys/devices/system/cpu/smt/active) -eq 0 ]]; then
		sed -i "s/\-j\([0-9]\+\)/\-j$(getconf _NPROCESSORS_ONLN)/g" "$sisyphusConfigDir"/sisyphus.make-opts.conf >/dev/null 2>&1 # global makeopts
	fi
}

setjobs