During today's ssh session to my amazon ec2 instance I got the following notice on log in:
System information disabled due to load higher than 1.0
System load averages is the average number of processes that are either in a runnable or uninterruptable state. A process in a runnable state is either using the CPU or waiting to use the CPU. A process in unin‐ terruptable state is waiting for some I/O access, eg waiting for disk. The averages are taken over the three time intervals. Load averages are not normalized for the number of CPUs in a system, so a load aver‐ age of 1 means a single CPU system is loaded all the time while on a 4 CPU system it means it was idle 75% of the time.
I understood that this is due to CPU reached 100% (I am using micro instance with ubuntu 13.10 installed). The problem is that looking at my aws monitor, I can see that for the last 20 minutes it has not reached even 20% bar and there was a spike that was close to 75% half an hour ago when I installed a lot of updates.
Can anyone clarify what is the problem?