Presentation of Virtual memory

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Groper Member
2
M.Faizan
62
Parviaz
Ishfaq
Mubashar
Mujahid
64
55
66
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Topic
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Outline
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What is Memory
Types of Memory
Virtual Memory
Needs Of Virtual Memory
Role of virtual memory
 Benefits using virtual memory
Advantage of Virtual Memory
Disadvantage Virtual Memory
How you increase your virtual
memory

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What is Memory
In computing memory refers to the physical devices
used to store programs or data on the temporary
or permanent basis for use in a
computer or other
digital electronic device
Main memory is divided into two parts :
-Random Access memory ( RAM ) should be
better known as Read Write Memory
-Read Only Memory (ROM)

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Type of Memory
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Real memory
Main memory
Virtual memory
Memory on disk
Allows for effective multiprogramming
and relieves the user
of tight constraints
of main memory

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Virtual Memory
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virtual memory is a common part of
operating system on desktop computer
The term virtual memory refers to
somethings which appears to be present
but actually it is not.

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Virtual Memory
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A computer can address more memory(RAM)
than the amount-physically installed ,on the
system, it is a section of hard disk 2Ndry memory
P1
P2
P3
P3
P3
P4
P4
P4
hard disk 2ndry memoryMain Memory(RAM)

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Virtual Memory
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A computer can address more memory(RAM)
than the amount-physically installed ,on the
system, it is a section of hard disk 2Ndry memory
P1
P2
P3
P3
P3
P4
P4
P4
hard disk 2ndry memoryMain Memory(RAM)
{Waiting
run

10. Superior University Depalpur
Virtual Memory
10
A computer can address more memory(RAM)
than the amount-physically installed ,on the
system, it is a section of hard disk 2Ndry memory
P1
P2
P3
P3
P3
P4
P4
P4
hard disk 2ndry memoryMain Memory(RAM)
{Waiting
run

11. Superior University Depalpur
Virtual Memory
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A computer can address more memory(RAM)
than the amount-physically installed ,on the
system, it is a section of hard disk 2Ndry memory
P1
P2
P3
P3
P3
P4
P4
P4
hard disk 2ndry memoryMain Memory(RAM)
{Waiting
run
} RAM
V.M

12. Superior University Depalpur
Virtual Memory
12
A computer can address more memory(RAM)
than the amount-physically installed ,on the
system, it is a section of hard disk 2Ndry memory
P1
P2
P3
P3
P3
P4
P4
P4
hard disk 2ndry memoryMain Memory(RAM)
{
Waiting
run
} RAM
V.M

13. Superior University Depalpur
Virtual Memory
13
A computer can address more memory(RAM)
than the amount-physically installed ,on the
system, it is a section of hard disk 2Ndry memory
P1
P2
P3
P3
P4
P4
P4
P3
hard disk 2ndry memoryMain Memory(RAM)
{
Waiting
run
} RAM
V.M
moves

14. Superior University Depalpur
Virtual Memory
14
A computer can address more memory(RAM)
than the amount-physically installed ,on the
system, it is a section of hard disk 2Ndry memory
P1
P2
P3
P3
P4
P4
P4
P3
hard disk 2ndry memoryMain Memory(RAM)
{
Waiting
run
} RAM
V.M

15. Superior University Depalpur
Virtual Memory
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A computer can address more memory(RAM)
than the amount-physically installed ,on the
system, it is a section of hard disk 2Ndry memory
P1
P2
P3
P4
P4
P4
P3
P3
hard disk 2ndry memoryMain Memory(RAM)
{
Waiting
run
} RAM
V.M
moves

16. Superior University Depalpur
Virtual Memory
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A computer can address more memory(RAM)
than the amount-physically installed ,on the
system, it is a section of hard disk 2Ndry memory
P1
P2
P3
P4
P4
P4
P3
P3
hard disk 2ndry memoryMain Memory(RAM)
{
Waiting
run
} RAM
V.M

17. Superior University Depalpur
Virtual Memory
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A computer can address more memory(RAM)
than the amount-physically installed ,on the
system, it is a section of hard disk 2Ndry memory
P1
P2
P4
P4
P4
P3
P3
P3
hard disk 2ndry memoryMain Memory(RAM)
{
Waiting
run
} RAM
V.M
moves

18. Superior University Depalpur
Virtual Memory
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A computer can address more memory(RAM)
than the amount-physically installed ,on the
system, it is a section of hard disk 2Ndry memory
P1
P2
P4
P4
P4
P3
P3
P3
hard disk 2ndry memoryMain Memory(RAM)
} RAM
V.M
moves

19. Superior University Depalpur
Virtual Memory
19
A computer can address more memory(RAM)
than the amount-physically installed ,on the
system, it is a section of hard disk 2Ndry memory
P1
P2
P4
P4
P4
P3
P3
P3
hard disk 2ndry memoryMain Memory(RAM)
} RAM
V.M
moves

20. Superior University Depalpur
Virtual Memory
20
A computer can address more memory(RAM)
than the amount-physically installed ,on the
system, it is a section of hard disk 2Ndry memory
P1
P2
P4
P4
P4
P3
P3
P3
hard disk 2ndry memoryMain Memory(RAM)
} RAM
V.M
moves

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why do we need Virtual Memory
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virtual memory is a imaginary memory
which we are assuming.
Before the development of the virtual
memory technique, programmers in the
1940s and 1950s had to manage directly
two-level storage such as main memory or
ram and secondary memory
in the form of hard disks
or earlier, magnetic drums.

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why do we need Virtual Memory
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If your computer lacks the random access
memory (RAM) needed to run a program
or operation, Windows uses virtual memory to
compensate. Virtual memory combines your
computer's RAM with temporary space on
your hard disk. When RAM runs low,
virtual memory moves data from
RAM to a space called a paging file.

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Role of virtual memory in operating system?
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Virtual memory is a memory management
capability of an OS that uses hardware
and software to allow a computer to
compensate for physical memory shortages
by temporarily transferring data from
random access memory (RAM) to disk storage

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Benefits of using virtual memory?
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The primary benefits of virtual memory
include freeing applications from having
to manage a shared memory space,
increased security due to memory isolation,
and being able to conceptually use more
memory than might be physically available,
using the technique of paging.

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Advantages Virtual Memory
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 You can run more applications at
once.
 You can run larger applications with
less real RAM.
 You don't have buy more memory
RAM.

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Disadvantages Virtual Memory
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 Applications run slower.
 It takes more time to switch between
applications.
 Less hard drive space for your use.
 It reduce system stability.

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Can we See the virtual memory?
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How you increase your virtual memory?
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1. Click Start, then click Control Panel.
2. Double-click System and Maintenance,
then click System.
3. In the left hand menu, click Advanced
system settings. ...
4. Click the Advanced tab.
5. Under Performance, click Settings.
6. Click the Advanced tab.
7. Under Virtual memory, click Change.

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Virtual Memory
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