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OPERATING SYSTEMS-
1.what is os ?
answer: An organised collection of software Extensions of h/w Consisting of controls Roteins
Operating a computer and for providing and environment for execution of programs.
2.define program counter?
Answer: The Counter indicates the address of the next instruction to be executed for this process.
3.what are the various Components of os ?
answer:
- Process Management
- main memory management
- file management
- i/o system management
- Secondary storage management
- Networking
- protection system
- Command interpreter system
4.what are the different process status availabe?
answer:
- new
- running
- waiting
- ready
- terminated
5. what is meant by dispatching ?
answer:
Dispatcher is the module That gives Control of the CPU to the process selected by the short term scheduler.
6.how is blocked state differ from others?
answer:
a process transitions to a blocked state .When it can not carry on without external change instate ,are event occurring
EXAMPLE:
A process block due to the unavailabililty of hardware (The printer) . There also block. When the require user input .
7.define memory management?
answer:
The run time mapping from virtual to physical address is done by a hardwork device called MMU(Memory management Unit).
8.Compare the global and local allegation ?
answer: global replacement allows a Process to Select a Replacement Frame . From the set of all frames ,Even if that Frame from another.local replacement Requires that each process Select from only its own set of allocated Frames.
9.define allocation algorithm ?
answer:
the easiest way to split m Frames among young processors is to give every one and equal share M/N frames (equal allocation)
10.what is victim frames ?
answer;
If there is no free frame , use a Page replacement algorithm to select a victim frame .
11.define threats?
answer:
When a Program written by one user .Many used by Another user ,Missile and unexpected behaviour may ensue.
12.What is cornell?
Answer:
the cornel is responsible for maintaining all the important abstraction of the Os Including
such thing as Virtual memory Processors.
ANOTHER IMPORTANT 2 MARKS ASKED BY NOV -17
1.what is an OS?
2.DEFINE REAL TIME SYSTEM?
ANS:
Another form of special purpose OS is a Real time system. It has well defined fixed time constraints . Processing must be done with in the defined constraints. or .the system will fail .
3.define process ?
answer:
process is a program in execution A process is a unit of work .In a modern time sharing system.
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