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Consider a system with a total of 150 units of memory, allocated to three processes as follows: Process Maximum Hold 1 70 45 2 60 40 3 60 15 Apply the banker’s algorithm to determine whether it would be safe to grant each of the following requests. Explain your answer. (a) A fourth process arrives, with a maximum memory need of 60 and an initial need of 25 units. (b) A fourth process arrives, with a maximum memory need of 60 and an initial need of 35 units. (c) A fourth process arrives, with a maximum memory need of 50 and an initial need of 30 units.

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Preciousorekha1

Answer: (a). safe    (b). not safe    (c). safe

Explanation:

quite a long way to go about this but it is straightforward nevertheless.

from the question we are given that the values;

(a).

Process             Max             Hold                    Need(Max-Hold)

P1                      70                  45                       25

P2                     60                  40                       20

P3                     60                   15                       45

P4                     60                   25                       35

#

we have the total units of memory to be 150

Our available becomes = 150 - (45+40+15+25) = 25

allocation for P1:

Process P2  has available resources to run = 70 - 60 -20 = 110 units

Process P1  has available resources to run = 70 units

Process P4 has available resources to run = 125 + 60 - 35 = 150 units

Process P3  has available resources to run = 110 + 60 - 45 = 125 units

from this regard we can conclude that it is Safe to grant the request.

(b). we are to add  a fourth process with max memory requirement of 60 and an initial need of 35 units.

Process             Max             Hold                    Need(Max-Hold)

P1                      70                  45                       25

P2                     60                  40                       20

P3                     60                   15                       45

P4                     60                   35                       25

Given our Total units = 150

We have our available units as 150 - (45 + 40 + 15 + 35) =  15

P2 is 20 but available in 15, Thus Minimum need for  a second process

This means that it is Not Safe to grant the request

(c). A fourth process arrives, with a maximum memory need of 50 and an initial need of 30 units

Process             Max             Hold                    Need(Max-Hold)

P1                      70                  45                       25

P2                     60                  40                       20

P3                     60                   15                       45

P4                     50                   30                       20

Given our Total units = 150

We have our available units as 150 - (45 + 40 + 15 + 30) =  20

We can see here that P4 requires 30 units, and thus it is allocated 30 units

From this we can simply state that'

It is Safe to grant request because 20 units will be left after the allocation for P4, so there is sufficient memory to guarantee the elimination of P2

Cheers i hope this helps!!!!

Following are the response to the given points:

  • Sure, it is safe. After assigning 25 units for P4, there'll be enough RAM to ensure termination of either P1 or P2.
  • Following that, students can finish the other three main tasks in any sequence they want.
  • Nope, it is not safe. When allocating 15 units for P4, there will also be insufficient RAM to ensure the termination of any process.

Learn more:

brainly.com/question/24097231

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