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refactor: simplify macOS core count to power of 2

This commit is contained in:
Martin Wimpress 2024-05-14 10:32:29 +01:00 committed by Martin Wimpress
parent cbc3c20104
commit 0b892f82a0
1 changed files with 10 additions and 4 deletions
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@ -265,10 +265,16 @@ function configure_cpu() {
GUEST_CPU_CORES="${cpu_cores}"
fi
if [ "${guest_os}" == "macos" ] && [ "${GUEST_CPU_CORES}" -gt 10 ] || [ "${GUEST_CPU_CORES}" -eq 6 ] || [ "${GUEST_CPU_CORES}" -eq 7 ]; then
# macOS guests cannot boot with most core counts not powers of 2. This will fix the issue by rounding the core count down to a power of 2. Uses wc and factor from coreutils.
factorCPUCores=$(factor "${GUEST_CPU_CORES}")
GUEST_CPU_CORES=$(( 2 ** $(echo "${factorCPUCores#*:}" | grep -o '[0-9]' | wc -l) ))
# macOS guests cannot boot with most core counts not powers of 2.
# Find the nearest but lowest power of 2 using a predefined table
if [ "${guest_os}" == "macos" ]; then
local POWERS=(1 2 4 8 16 32 64 128 256 512 1024)
for (( i=${#POWERS[@]}-1; i>=0; i-- )); do
if [ "${POWERS[i]}" -le "${GUEST_CPU_CORES}" ]; then
GUEST_CPU_CORES="${POWERS[i]}"
break
fi
done
fi
# Account for Hyperthreading/SMT.