Question

please dont use resource from book "operating system concept 9th edition"

After reading each problem provide the answer using at least two sources such as an academic journal or a book chapter (not your text book). While providing answer, you must use information from your sources to answer the question. At the end of each answer, provide a conclusion. Put all your answers in one Word file and submit below.

Q. Describe the difference among short-term, medium-term, and long-term scheduling. Which method would be most efficient with multi-processing servers? Explain why.

Answer 1

Short-term (CPU scheduler)—selects from jobs in memory those jobs that are ready to
execute and allocates the CPU to them.

Medium-term—used especially with time-sharing systems as an intermediate scheduling
level. A swapping scheme is implemented to remove partially run programs from
memory and reinstate them later to continue where they left off.

Long-term (job scheduler)—determines which jobs are brought into memory for processing.

The primary difference is in the frequency of their execution. The short-term must select a new process quite often. Long-term is used much less often since it handles placing jobs in the system and may wait a while for a job to finish before it admits another one.