should show any immediate performance problems

should show I/O, paging, and processor activity

need show only the I/O and processor activity

usually reports only on terminal displays

is good, since that means the device is in use

is bad, since that means the device is not available

is bad only if the device busy rate is too high

depends upon the system paging rate

show which processes used the most processor time

show process activity by time interval

show resources used by the most active processes

all of these

is the same as device busy

shows the availability of the path of devices

can be prevented with more devices

can be prevented by reducing the paging rate

synchronize access to local resources

synchronize access to global resources

are used to avoid local locks.

prevent access to global resources