Table of Contents
- 1 What is the limitation of interrupt driven I O?
- 2 What are the drawbacks of programmed and interrupt driven IO?
- 3 Which interrupt method has disadvantage that if there are many interrupts the time required to examine them can exceed the time available to service the I O device?
- 4 Why program Controlled I O is unsuitable for high speed data transfer?
- 5 How does polling driven i/o differ from interrupts driven I O?
- 6 What are the disadvantages of polling Scheme over interrupt scheme?
- 7 Which interrupt method has disadvantage that if there are many interrupts?
What is the limitation of interrupt driven I O?
I/O module gets data from peripheral whilst CPU does other work. I/O module interrupts CPU. CPU requests data. I/O module transfers data….Interrupt Driven I/O.
| Advantages | – fast |
|---|---|
| Disadvantages | – can be tricky to write if using a low level language |
| – can be tough to get various pieces to work well together |
What are the drawbacks of programmed and interrupt driven IO?
Drawback of a programmed I/O: BUSY-WAIT LOOP.
What are the limitations of programmed I O?
The processor executes a program that gives it direct control of the I/O operation, including sensing device status, sending a read or write command, and transferring the data….Programmed I/O.
| Advantages | – simple to implement |
|---|---|
| Disadvantages | – busy waiting |
| – ties up CPU for long period with no useful work |
Which interrupt method has disadvantage that if there are many interrupts the time required to examine them can exceed the time available to service the I O device?
software method
The disadvantage of the software method is that if there are many interrupts, the time required to poll them can exceed the time available to service the I/O device. In this situation a hardware priority-interrupt unit can be used to speed up the operation.
Why program Controlled I O is unsuitable for high speed data transfer?
Programmed I/O is not suitable for high-speed data transfer because: a. For transfer of every word between I/O device and memory, a set of machine instructions has to be executed. It does not support synchronous mode of data transmission that is a requirement for many high-speed peripherals like disk.
What is the drawback of programmed I O method and how it can be resolved by interrupt initiated i o?
Thus programmed I/O is a time consuming process that keeps the processor busy needlessly and leads to wastage of the CPU cycles. This can be overcome by the use of an interrupt facility….Difference between Programmed and Interrupt Initiated I/O :
| Programmed I/O | Interrupt Initiated I/O |
|---|---|
| Its module is treated as a slow module. | Its module is faster than programmed I/O module. |
How does polling driven i/o differ from interrupts driven I O?
Polled (or programmed) I/O: The CPU periodically manually checks if there are any I/O requests available. If there isn’t, it keeps executing its normal workflow. If there is, it handles the I/O request instead. Interrupt-Driven I/O: The CPU doesn’t need to manually check for I/O requests.
What are the disadvantages of polling Scheme over interrupt scheme?
Disadvantages of Polling and Interrupt Disadvantages of polling are the standby time of some devices that is shorter than the response time and then another method of transmission should be applied, as well as that the CPU consumes unnecessary time to check devices that have not searched for data transfer.
Which of the following statements are disadvantages of memory mapped I O?
But there are also disadvantages: An I/O error on a memory-mapped file cannot be caught and dealt with by SQLite. Instead, the I/O error causes a signal which, if not caught by the application, results in a program crash.
Which interrupt method has disadvantage that if there are many interrupts?
The disadvantage of the software method is that if there are many interrupts, the time required to poll them can exceed the time available to service the I/O device. In this situation a hardware priority-interrupt unit can be used to speed up the operation.