linux_kernel/tools/virtio/ringtest/run-on-all.sh

#!/bin/sh

#use last CPU for host. Why not the first?
#many devices tend to use cpu0 by default so
#it tends to be busier
HOST_AFFINITY=$(cd /dev/cpu; ls|grep -v '[a-z]'|sort -n|tail -1)

#run command on all cpus
for cpu in $(cd /dev/cpu; ls|grep -v '[a-z]'|sort -n);
do
	#Don't run guest and host on same CPU
	#It actually works ok if using signalling
	if
		(echo "$@" | grep -e "--sleep" > /dev/null) || \
			test $HOST_AFFINITY '!=' $cpu
	then
		echo "GUEST AFFINITY $cpu"
		"$@" --host-affinity $HOST_AFFINITY --guest-affinity $cpu
	fi
done
echo "NO GUEST AFFINITY"
"$@" --host-affinity $HOST_AFFINITY
echo "NO AFFINITY"
"$@"