1.CPU utilization – keep the CPU as busy as possible
Throughput – # of processes that complete their execution per time unit
Turnaround time – amount of time to execute a particular process
Waiting time – amount of time a process has been waiting in the ready queue
Response time – amount of time it takes from when a request was submitted until the first response is produced, not output (for time-sharing environment)

 

2.A CPU bursts when it is executing instructions;Select a process / thread from the ready queue as the next process / thread to be run by the CPU;
An I/O system bursts when it services requests to fetch information.

The process requests data from the operating system;

The operating system loads the external data into the buffer of the kernel;

The operating system copies the kernel buffer to the process buffer;

The process obtains data to complete its own functions;