Computer Science Engineering (CSE) Exam > Computer Science Engineering (CSE) Questions > Consider the following set of statements:A: T...
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Consider the following set of statements:
A: The write-back policy increases memory writes.
B: Direct mapping technique faces the problem of thrashing.
C: Temporal locality refers to the tendency of execution to involve a number of memory locations that are clustered.
Which of the given statements is/are incorrect?
- a)Both A and C
- b)Both B and C
- c)Both A and B
- d)All A, B and C
Correct answer is option 'A'. Can you explain this answer?
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Verified Answer
Consider the following set of statements:A: The write-back policy incr...
Write back, minimizes memory writes. With write back, updates are made only in the cache. When an update occurs, a dirty bit, or use bit, associated with the line is set. Then, when a block is replaced, it is written back to main memory if and only if the dirty bit is set.
The main disadvantage of direct mapping is that there is a fixed cache location for any given block. Thus, if a program happens to reference words repeatedly from two different blocks that map into the same line, then the blocks will be continually swapped in the cache, and the hit ratio will be low (a phenomenon known as thrashing).
Spatial locality refers to the tendency of execution to involve a number of memory locations that are clustered. This reflects the tendency of a processor to access instructions sequentially. The spatial location also reflects the tendency of a program to access data locations sequentially, such as when processing a table of data.
Therefore, option 1 is the correct answer.
Most Upvoted Answer
Consider the following set of statements:A: The write-back policy incr...
Incorrect Statements:
According to the given set of statements, the incorrect statement is:
A: The write-back policy increases memory writes.
Explanation:
The given set of statements discuss three different concepts related to computer architecture. Let's analyze each statement individually to determine which one is incorrect.
A: The write-back policy increases memory writes.
The write-back policy is a caching technique that is used to reduce the number of memory writes. In this policy, the modified data is written back to the main memory only when it is evicted from the cache or when it is explicitly requested. This is in contrast to the write-through policy, where every write operation is immediately propagated to the main memory. Therefore, statement A is incorrect as the write-back policy actually reduces memory writes.
B: Direct mapping technique faces the problem of thrashing.
The direct mapping technique is a cache mapping technique where each memory block is mapped to a specific cache location. In this technique, if multiple memory blocks are mapped to the same cache location, a conflict occurs. However, thrashing is a phenomenon that occurs when the system spends a significant amount of time and resources swapping data in and out of memory, which leads to poor performance. Thrashing is not directly related to the direct mapping technique. Therefore, statement B is incorrect as the direct mapping technique does not face the problem of thrashing.
C: Temporal locality refers to the tendency of execution to involve a number of memory locations that are clustered.
Temporal locality, also known as locality of reference, refers to the tendency of a program to access the same memory locations multiple times within a short period of time. This is based on the observation that programs often exhibit repetitive behavior, where recently accessed memory locations are likely to be accessed again in the near future. Therefore, statement C is correct as it accurately describes temporal locality.
Conclusion:
Based on the analysis, we can conclude that statement A is incorrect as the write-back policy actually reduces memory writes. Therefore, the correct answer is option 'A' - Both A and C.
According to the given set of statements, the incorrect statement is:
A: The write-back policy increases memory writes.
Explanation:
The given set of statements discuss three different concepts related to computer architecture. Let's analyze each statement individually to determine which one is incorrect.
A: The write-back policy increases memory writes.
The write-back policy is a caching technique that is used to reduce the number of memory writes. In this policy, the modified data is written back to the main memory only when it is evicted from the cache or when it is explicitly requested. This is in contrast to the write-through policy, where every write operation is immediately propagated to the main memory. Therefore, statement A is incorrect as the write-back policy actually reduces memory writes.
B: Direct mapping technique faces the problem of thrashing.
The direct mapping technique is a cache mapping technique where each memory block is mapped to a specific cache location. In this technique, if multiple memory blocks are mapped to the same cache location, a conflict occurs. However, thrashing is a phenomenon that occurs when the system spends a significant amount of time and resources swapping data in and out of memory, which leads to poor performance. Thrashing is not directly related to the direct mapping technique. Therefore, statement B is incorrect as the direct mapping technique does not face the problem of thrashing.
C: Temporal locality refers to the tendency of execution to involve a number of memory locations that are clustered.
Temporal locality, also known as locality of reference, refers to the tendency of a program to access the same memory locations multiple times within a short period of time. This is based on the observation that programs often exhibit repetitive behavior, where recently accessed memory locations are likely to be accessed again in the near future. Therefore, statement C is correct as it accurately describes temporal locality.
Conclusion:
Based on the analysis, we can conclude that statement A is incorrect as the write-back policy actually reduces memory writes. Therefore, the correct answer is option 'A' - Both A and C.
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Consider the following set of statements:A: The write-back policy increases memory writes.B: Direct mapping technique faces the problem of thrashing.C:Temporal locality refers to the tendency of execution to involve a number of memory locations that are clustered.Which of the given statements is/are incorrect?a)Both A and Cb)Both B and Cc)Both A and Bd)All A, B and CCorrect answer is option 'A'. Can you explain this answer?
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