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#!/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
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