Definitions for "Cpu time"
CPU time is time spent running on a CPU. It does not include time spent waiting for I/O, sleeping, or anything else an application does between two events.
The amount of time, in seconds, that a user, group, or account has used the CPU (Central Processing Unit).
Process virtual time (see the glossary entry) plus time spent when the system is running on behalf of the process, performing such tasks as executing a system call. This is the time returned in pcsamp and usertime experiments.