Scheduling and Threads

the switching of the CPU from one process or thread to another is called

• task switch

• context switch

• preemption

• process inheritance

I will remember to calculate CPU utilization I use 1 - p^n where n is the number of processes and p is the percentage of time the processes wait

• yes

• no

Cooperative multitasking

• the process yields the CPU voluntariuly

• the process yields the CPU involuntarily

• the OS makes the process to yeild

• the OS requests the process yield

Preemptive multitaking

• The process yields the CPU coluntarily

• The OS forces the process to yield

• The OS requests the process yeild

• The process preempts the OS

Scheduling algorithm goals

• Fairness

• Process enforcement

• Balance

• Performance

An area of code or variables shared by threads is called

• Critical region

• Shared memory

• Shared fabric

• Scope

I will know how to do FCFS, SJN, SJN with preemption, Priority and Priority with preemption

• True

• False

Given 8GB of RAM, the OS taking 2GB of RAM and each user program taking 2GB we can run 3 user programs at once. With an 80% average I/O wait the CPU utilization is:

• 48.8%

• 72%

• 20%

• 25%