Question

Consider the parameter Δ used to define the working-set window inthe working-set model. When Δ is set to a low value, what is the effecton the page-fault frequency and the number of active (nonsuspended)processes currently executing in the system? What is the effect when Δis set to a very high value?

Answer 1

When Δ is set to large value, then a process's resident set is overestimated and this might prevent many processes from being scheduled even though their required pages are resident

Step-by-step explanation:

When Δ is set to a small value, then the set of resident pages for a process might be underestimated, allowing a process to be scheduled even though all of its required pages are not resident.

This could result in a large number of page faults. When Δ is set to large value, then a process's resident set is overestimated and this might prevent many processes from being scheduled even though their required pages are resident.

Hoewever, once a process is scheduled, it is unlikely to generate page faults since its resident set has been overestimated.