lscpu | grep "Off-line"
echo 1 > /sys/devices/system/cpu/cpu9/online

OFF_CPUS=$(lscpu | grep "Off-line" | awk '{print $NF}' | tr '-' ' ')
for i in $(seq $OFF_CPUS);do echo 1 > /sys/devices/system/cpu/cpu$i/online;done

查看生效

lscpu