Question:
In a two-level memory hierarchy, the access time of the cache memory is 12 nsec and the access time of the main memory is 1.5 msec. The hit ratio is 0.98. What is the average access time of the two-level memory system?
In a two-level memory hierarchy, the access time of the cache memory is 12 nsec and the access time of the main memory is 1.5 msec. The hit ratio is 0.98. What is the average access time of the two-level memory system?
Show Hint
To calculate the average access time in a two-level memory hierarchy, use the formula incorporating the hit ratio, cache access time, and the main memory access time.
Updated On: Feb 11, 2026
- 13.5 nsec
- 42 nsec
- 7.56 nsec
- 41.76 nsec
Show Solution
Verified By Collegedunia
The Correct Option is D
Solution and Explanation
To calculate the average access time, we use the formula: Average Access Time = (Hit Ratio) × (Cache Access Time) + (1 − Hit Ratio) × (Main Memory Time). Given: Hit Ratio = 0.98, Cache Access Time = 12 nsec, Main Memory Access Time = 1.5 msec = 1.5 × 10^6 nsec. Substitute the values into the formula: Average Access Time = (0.98) × (12) + (0.02) × (1.5 × 10^6). Average Access Time = 11.76 + 30,000 = 30,011.76 nsec. The average access time is approximately 41.76 nsec.
Was this answer helpful?
0
0
Top CUET PG Data Science A.I Cyber Security and Computer Sci. Questions
- Choose the correct answer from the options given below:
(A). RAID 3 requires only a single redundant disk.
(B) In RAID 4 scheme, two different parity calculations are carried out and stored in separate blocks on different disks.
(C) RAID 5 distributes the parity strips across all disks.
(D) In RAID 2, the number of redundant disks are proportional to the log of the number of data disks. - In case of DMA, after the completion of the transfer, the processor is required to be notified of the completion. This is done through.
- Match List I with List II.
List I List II A. Supervisor mode I. Entered when the processor encounters a software interrupt instruction B. Abort Mode II. Entered in response to memory fault C. Fast Interrupt Mode III. Entered whenever the processor receives an interrupt signal from a designated fast interrupt source D. Interrupt Mode IV. Entered whenever the processor receives an interrupt signal from any other source - Deallocation of stack of thread and register contexts will take place.
- Match List I with List II.
List I List II A. Segmentation I. Memory is viewed as a collection of logical address spaces. B. Unsegmented paged memory II. Virtual address is the same as the physical address. C. Segmented unpaged memory III. Memory is viewed as a paged linear address space. D. Segmented paged memory IV. Manages the allocation of memory within a partition.
View More Questions
Top CUET PG Computer Organization and Architecture Questions
- Choose the correct answer from the options given below:
(A). RAID 3 requires only a single redundant disk.
(B) In RAID 4 scheme, two different parity calculations are carried out and stored in separate blocks on different disks.
(C) RAID 5 distributes the parity strips across all disks.
(D) In RAID 2, the number of redundant disks are proportional to the log of the number of data disks. - A magnetic disk pack has the following specifications: 16 surfaces, 128 tracks per surface, 256 sectors per track, and 512 bytes per sector. Calculate the capacity of the disk pack.
- The sequence of events that happen during a typical fetch operation is:
(A) MAR
(B) IR
(C) MDR
(D) Memory
(E) PC
Choose the correct answer from the options given below:
Top CUET PG Questions
- Given below are two statements:
Statement I: For Plato the meaning of the word 'Justice' is basically a conception in the mind only.
Statement II: For Plato the meaning of the word 'Justice' is fixed, mind-independently
In the light of the above statements, choose the correct answer from the options given below: - What is the electron count of OS6CO182-?
- XeF4 hydrolysis gives A + B, HF, and Oxygen. Find A and B
- What is more basic in pyrol and pyridine?
- Hydrolysis of Al2C3, Be2?
View More Questions