Question

Consider a memory management system that allows overlays to accommodate processes that have larger overall memory requirements than can be allocated in one shot in the main memory. let a process p be restricted to a total main memory of 512kb at any time. in order to work with this restriction, let process p be structured as two overlays a and b. let the code specific to overlay a have a size of 180kb, let the data specific to overlay b have a size of 40kb and let the common data across the two overlays be 80kb in size. let x represent the size of the code common to both the overlays, y represent the size of the code specific to overlay b, and z represent the size of the data specific to overlay a. which of the following (x,y,z) triples would allow process p to execute in the system? question options:

a. (160kb, 240kb, 60kb)
b. (220kb, 180kb, 10kb)
c. (220kb, 140kb, 40kb)
d. (220kb, 160kb, 20kb)

Answer 1

None of the provided (x,y,z) option triples would allow process P to execute within the 512kb memory constraint, as all options exceed this limit when the sizes of the components are summed up. option a is the correct answer.

Step-by-step explanation:

The student's question involves a memory management system in which a process P has to work within a 512kb main memory limitation using two overlays A and B. The size of the components of these overlays are given, along with the variables x, y, and z which represent the common code size, the code specific to overlay B, and the data specific to overlay A, respectively. For process P to execute without exceeding the memory limitation, the sum of the sizes of overlay A (180kb of code), overlay B (40kb of data), the common data across both overlays (80kb), x, y, and z must not exceed 512kb.

Given the options, we can use simple addition to determine which set of values for x, y, and z would allow process P to function within the memory constraint:

1. Option A: 180kb + 40kb + 80kb + 160kb + 240kb + 60kb = 760kb (Exceeds limit)
2. Option B: 180kb + 40kb + 80kb + 220kb + 180kb + 10kb = 710kb (Exceeds limit)
3. Option C: 180kb + 40kb + 80kb + 220kb + 140kb + 40kb = 700kb (Exceeds limit)
4. Option D: 180kb + 40kb + 80kb + 220kb + 160kb + 20kb = 700kb (Exceeds limit)

Unfortunately, none of the provided options allow process P to execute within a 512kb memory constraint. There may be a mistake given the question's setup or the options provided, as all combinations exceed the specified memory limit.