10% CPU

Process that will consume roughly 10% CPU:

while true
do 
   time dd if=/dev/urandom bs=1024k count=1 2>/dev/null | gzip -9 > /dev/null
   sleep 0.9 # adjust as required
done > /tmp/log.out 2>&1 &


int i, usecs = 300;
while (1) 
{
   for (i=0; i<100000; i++) {}
   usleep(usecs);
}