.. _metrics:

Scheduler Metrics
===========================

.. index:: CPU utilization
.. describe:: CPU Utilization

    The percentage of time that the CPU is busy -- not idle.

.. index:: throughput
.. describe:: Throughput

    The number of processes that are completed per time unit.

.. index:: waiting time
.. describe:: Waiting time

    The sum of the time spent in the ready queue during the life of the
    process.  Time blocked, waiting for I/O, is not part of the waiting time.

.. index:: service time
.. describe:: service time

    The amount of CPU time that a process will need before it either
    finishes or voluntarily exits the CPU, such as to wait for input /
    output.

.. index:: turnaround time
.. describe:: Turnaround time for a process

    The amount of time between the time a process arrives in the ready state
    to the time it exits the running state for the last time

.. index:: response time
.. describe:: response time
    
    The time from first submission of the process until the first running.