All Courses
Explore Courses UPSC Exam UPSC Test Series Free Notes EduRev Infinity Get the App Login Join for Free
Sign in Open App
Computer Science Engineering (CSE) Exam  >  Computer Science Engineering (CSE) Questions  >  A device with data transfer rate 10 KB/sec is... Start Learning for Free
SaveJoin the Discussion on the App
A device with data transfer rate 10 KB/sec is connected to a CPU. Data is transferred byte-wise. Let the interrupt overheadbe 4 sec. The byte transfer time between the device interface register and CPU or memory is negligible. What is theminimum performance gain of operating the device under interrupt mode over operating it under program-controlled mode?
  • a)
    15
  • b)
    25
  • c)
    35
  • d)
    45
Correct answer is option 'B'. Can you explain this answer?
FREE This question is part of
Download PDF Attempt Test
Download PDF Attempt this Test
Verified Answer
A device with data transfer rate 10 KB/sec is connected to a CPU. Data...
In Programmed I/O, the CPU issues a command and waits for I/O operations to complete.
So here, CPU will wait for 1sec to transfer 10KB of data.
overhead in programmed I/O = 1 sec
In Interrupt mode , data is transferred word by word (here word size is 1 byte as mentioned in question "Data is transferred byte-wise").
So to transfer 1 byte of data overhead is 4 x 10-6sec
Thus to transfer 10 KB of data overhead is = 4 x 10-6 x 104 sec
Performance gain
Thus, (b) is correct answer.
View all questions of this test
Most Upvoted Answer
A device with data transfer rate 10 KB/sec is connected to a CPU. Data...
Performance gain of interrupt mode over program-controlled mode

Interrupt mode and program-controlled mode are two methods of handling data transfer between a device and a CPU. In interrupt mode, the device notifies the CPU when it has data ready to transfer, while in program-controlled mode, the CPU continuously checks the device for data. The question asks for the minimum performance gain of operating the device under interrupt mode over operating it under program-controlled mode, given certain parameters.

Given parameters:
- Data transfer rate = 10 KB/sec
- Interrupt overhead = 4 sec
- Byte transfer time between device interface register and CPU/memory = negligible

Calculating time taken for data transfer:
- In program-controlled mode, the CPU checks the device for data byte-by-byte, taking 1/10,000 sec per byte. So, transferring 1 KB of data would take 1000 * 1/10,000 = 0.1 sec.
- Therefore, transferring 10 KB of data would take 10 * 0.1 = 1 sec.

Calculating time taken for interrupt overhead:
- Interrupt overhead is given as 4 sec.

Calculating total time taken:
- In program-controlled mode, transferring 10 KB of data would take 1 sec.
- In interrupt mode, transferring 10 KB of data would take (10 * 1/10,000) + 4 = 4.001 sec.
- Therefore, the performance gain of operating the device under interrupt mode over operating it under program-controlled mode is (1 - 4.001/1) * 100% = -300.1%, which is negative.

However, as negative performance gain doesn't make sense, we can take the absolute value, which is 300.1%. But as options for the answer do not have negative values, we can take the difference between 4.001 and 1, and then divide it by 1, which gives (4.001 - 1)/1 * 100% = 300.1%.

Therefore, the minimum performance gain of operating the device under interrupt mode over operating it under program-controlled mode is 300.1%, which is closest to option (B) 25%.
< Previous Question Next Question >
Explore Courses for Computer Science Engineering (CSE) exam

Similar Computer Science Engineering (CSE) Doubts

On a non-pipelined sequential processor, a program segment, which is a part of the interrupt service routine, is given to transfer 500 bytes from an I/O device to memory.Initialize the address registerInitialize the count to 500LOOP: Load a byte from deviceStore in memory at address given by address registerIncrement the address registerDecrement the countIf count != 0 go to LOOPAssume that each statement in this program is equivalent to a machine instruction which takes one clock cycle to execute if it is a non-load/store instruction. The load-store instructions take two clock cycles to execute.The designer of the system also has an alternate approach of using the DMA controller to implement the same transfer. The DMA controller requires 20 clock cycles for initialization and other overheads. Each DMA transfer cycle takes two clock cycles to transfer one byte of data from the device to the memory.Q. What is the approximate speedup when the DMA controller based design is used in place of the interrupt driven program based input-output?

In a general purpose computer system the CPU, the main memory and the cache may be interconnected via one or more shared system bus(es). However, input/output devices (eg. Hard disk, network interfaces) may only be connected to the system bus through an I/O controller. The following are four statements regarding the requirement for an I/O controller.1. The capacities of I/O devices are magnitude order larger than that of main memory and hence direct interfacing is impossible.2. The response times of I/O devices are magnitude order slower than that of CPU and hence direct interfacing is impossible.3. It is always better to off load the I/O processing to a secondary processor on the I/O controller board then to depend on the primary CPU for I/O processing.4. The variety of I/O devices in the market requires that a separate I/O controller exist for each device.Q. What statement(s) best explain the requirement for an I/O controller?

Top Courses for Computer Science Engineering (CSE)View all

Top Courses for Computer Science Engineering (CSE)

A device with data transfer rate 10 KB/sec is connected to a CPU. Data is transferred byte-wise. Let the interrupt overheadbe 4 sec. The byte transfer time between the device interface register and CPU or memory is negligible. What is theminimum performance gain of operating the device under interrupt mode over operating it under program-controlled mode?a)15b)25c)35d)45Correct answer is option 'B'. Can you explain this answer?
Question Description
A device with data transfer rate 10 KB/sec is connected to a CPU. Data is transferred byte-wise. Let the interrupt overheadbe 4 sec. The byte transfer time between the device interface register and CPU or memory is negligible. What is theminimum performance gain of operating the device under interrupt mode over operating it under program-controlled mode?a)15b)25c)35d)45Correct answer is option 'B'. Can you explain this answer? for Computer Science Engineering (CSE) 2024 is part of Computer Science Engineering (CSE) preparation. The Question and answers have been prepared according to the Computer Science Engineering (CSE) exam syllabus. Information about A device with data transfer rate 10 KB/sec is connected to a CPU. Data is transferred byte-wise. Let the interrupt overheadbe 4 sec. The byte transfer time between the device interface register and CPU or memory is negligible. What is theminimum performance gain of operating the device under interrupt mode over operating it under program-controlled mode?a)15b)25c)35d)45Correct answer is option 'B'. Can you explain this answer? covers all topics & solutions for Computer Science Engineering (CSE) 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for A device with data transfer rate 10 KB/sec is connected to a CPU. Data is transferred byte-wise. Let the interrupt overheadbe 4 sec. The byte transfer time between the device interface register and CPU or memory is negligible. What is theminimum performance gain of operating the device under interrupt mode over operating it under program-controlled mode?a)15b)25c)35d)45Correct answer is option 'B'. Can you explain this answer?.
Solutions for A device with data transfer rate 10 KB/sec is connected to a CPU. Data is transferred byte-wise. Let the interrupt overheadbe 4 sec. The byte transfer time between the device interface register and CPU or memory is negligible. What is theminimum performance gain of operating the device under interrupt mode over operating it under program-controlled mode?a)15b)25c)35d)45Correct answer is option 'B'. Can you explain this answer? in English & in Hindi are available as part of our courses for Computer Science Engineering (CSE). Download more important topics, notes, lectures and mock test series for Computer Science Engineering (CSE) Exam by signing up for free.
Here you can find the meaning of A device with data transfer rate 10 KB/sec is connected to a CPU. Data is transferred byte-wise. Let the interrupt overheadbe 4 sec. The byte transfer time between the device interface register and CPU or memory is negligible. What is theminimum performance gain of operating the device under interrupt mode over operating it under program-controlled mode?a)15b)25c)35d)45Correct answer is option 'B'. Can you explain this answer? defined & explained in the simplest way possible. Besides giving the explanation of A device with data transfer rate 10 KB/sec is connected to a CPU. Data is transferred byte-wise. Let the interrupt overheadbe 4 sec. The byte transfer time between the device interface register and CPU or memory is negligible. What is theminimum performance gain of operating the device under interrupt mode over operating it under program-controlled mode?a)15b)25c)35d)45Correct answer is option 'B'. Can you explain this answer?, a detailed solution for A device with data transfer rate 10 KB/sec is connected to a CPU. Data is transferred byte-wise. Let the interrupt overheadbe 4 sec. The byte transfer time between the device interface register and CPU or memory is negligible. What is theminimum performance gain of operating the device under interrupt mode over operating it under program-controlled mode?a)15b)25c)35d)45Correct answer is option 'B'. Can you explain this answer? has been provided alongside types of A device with data transfer rate 10 KB/sec is connected to a CPU. Data is transferred byte-wise. Let the interrupt overheadbe 4 sec. The byte transfer time between the device interface register and CPU or memory is negligible. What is theminimum performance gain of operating the device under interrupt mode over operating it under program-controlled mode?a)15b)25c)35d)45Correct answer is option 'B'. Can you explain this answer? theory, EduRev gives you an ample number of questions to practice A device with data transfer rate 10 KB/sec is connected to a CPU. Data is transferred byte-wise. Let the interrupt overheadbe 4 sec. The byte transfer time between the device interface register and CPU or memory is negligible. What is theminimum performance gain of operating the device under interrupt mode over operating it under program-controlled mode?a)15b)25c)35d)45Correct answer is option 'B'. Can you explain this answer? tests, examples and also practice Computer Science Engineering (CSE) tests.
Explore Courses for Computer Science Engineering (CSE) exam

Top Courses for Computer Science Engineering (CSE)

Explore Courses

Suggested Free Tests

Signup for Free!
Signup to see your scores go up within 7 days! Learn & Practice with 1000+ FREE Notes, Videos & Tests.
10M+ students study on EduRev
Get App
© EduRev
Education Revolution
Signup to see your scores go up within 7 days!
Access 1000+ FREE Docs, Videos and Tests
Takes less than 10 seconds to signup