How JustAnswer Works:

  • Ask an Expert
    Experts are full of valuable knowledge and are ready to help with any question. Credentials confirmed by a Fortune 500 verification firm.
  • Get a Professional Answer
    Via email, text message, or notification as you wait on our site.
    Ask follow up questions if you need to.
  • 100% Satisfaction Guarantee
    Rate the answer you receive.

Ask ehabtutor Your Own Question

ehabtutor, Computer Software Engineer
Category: Programming
Satisfied Customers: 1327
Experience:  Bachelor of computer science, 5+ years experience in software development, software company owner
Type Your Programming Question Here...
ehabtutor is online now
A new question is answered every 9 seconds

2. Describe the major disadvantages for each of the four memory

Customer Question

2. Describe the major disadvantages for each of the four memory allocation schemes presented in this chapter.
             Best-Fit memory allocation
     Dynamic Partitions
     Fixed Partitions
     Relocatable dynamic partitions
Submitted: 7 years ago.
Category: Programming
Expert:  ehabtutor replied 7 years ago.

Best - Fit memory Allocation

Major Disadvantages:

  • Tend to leave some very small holes which can't be used easily
  • Best-fit makes the best use of memory space but slower in making allocation


Dynamic Partitions

Major Disadvantages:

  • When processes finish and new processes are brought in, the main memory becomes more and more fragmented, and memory use declines.
  • Fully utilizes memory only when the first jobs are loaded
  • Requires dynamic relative addressing


Fixed Partitions

Major Disadvantages:

  • The number of partitions is predefined and limits the total number of active processes in the system.
  • Partition sizes are preset and small jobs do not run efficiently
  • Arbitrary partition sizes lead to undesired results
    • Too small a partition size results in large jobs having longer turnaround time
    • Too large a partition size results in memory waste or internal fragmentation

Relocatable dynamic Partitions

Major Disadvantages:

  • Time consumption is very high
  • Due to compaction Every program in memory must be relocated so they are contiguous
  • Operating system must distinguish between addresses and data values which consumes a lot of time


Don't forget to leave positive feedback

Bonuses are lawyas appreciated.




Expert:  ehabtutor replied 7 years ago.

Did you get the answers?


Do you need any further help?