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A certain computer system design has a single CPU, a two-level cache, and supports memory mapped I/O for output-only controllers. Which of the following is true?
- a)The design i impossible, since memory mapped I/O will prevent cache coherence.
- b)In two-level caches, the L1 cache is generally built from SRAM.
- c)In two-level caches the L1 cache is generally larger then L2 cache.
- d)In two-level caches, the L2 cache generally has a lower latency than the L1 cache
Correct answer is option 'B'. Can you explain this answer?
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Verified Answer
A certain computer system design has a single CPU, a two-level cache, ...
In 2-level cache, level-2 cache is generally larger than and equal to level-1 cache, level-1 cache has access detency less than level-2 cache and L1 cache generally build from SRAM.
Most Upvoted Answer
A certain computer system design has a single CPU, a two-level cache, ...
Explanation:
- L1 Cache in Two-Level Caches:
In two-level cache systems, the L1 cache is typically built from SRAM (Static Random Access Memory). SRAM is faster and more expensive than DRAM, making it suitable for the fast, small cache memory closest to the CPU.
- L2 Cache in Two-Level Caches:
The L2 cache in a two-level cache system is generally larger and slower than the L1 cache. It is usually made from SRAM as well, but with a larger capacity compared to the L1 cache.
- Role of Two-Level Cache:
The two-level cache system helps improve overall performance by storing frequently accessed data closer to the CPU in the faster L1 cache, with additional data stored in the larger L2 cache. This reduces the need to access slower main memory frequently.
- Benefits of Two-Level Cache:
Having a two-level cache system allows for a balance between speed and capacity, optimizing performance for the CPU. The L1 cache provides fast access to critical data, while the L2 cache offers a larger storage capacity for additional data.
- Conclusion:
In the given computer system design with a single CPU and two-level cache, the L1 cache is generally built from SRAM. This design choice ensures that the closest and fastest cache memory to the CPU is optimized for speed and efficiency, enhancing overall system performance.
- L1 Cache in Two-Level Caches:
In two-level cache systems, the L1 cache is typically built from SRAM (Static Random Access Memory). SRAM is faster and more expensive than DRAM, making it suitable for the fast, small cache memory closest to the CPU.
- L2 Cache in Two-Level Caches:
The L2 cache in a two-level cache system is generally larger and slower than the L1 cache. It is usually made from SRAM as well, but with a larger capacity compared to the L1 cache.
- Role of Two-Level Cache:
The two-level cache system helps improve overall performance by storing frequently accessed data closer to the CPU in the faster L1 cache, with additional data stored in the larger L2 cache. This reduces the need to access slower main memory frequently.
- Benefits of Two-Level Cache:
Having a two-level cache system allows for a balance between speed and capacity, optimizing performance for the CPU. The L1 cache provides fast access to critical data, while the L2 cache offers a larger storage capacity for additional data.
- Conclusion:
In the given computer system design with a single CPU and two-level cache, the L1 cache is generally built from SRAM. This design choice ensures that the closest and fastest cache memory to the CPU is optimized for speed and efficiency, enhancing overall system performance.
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A certain computer system design has a single CPU, a two-level cache, and supports memory mapped I/O for output-only controllers. Which of the following is true?a)The design i impossible, since memory mapped I/O will prevent cache coherence.b)In two-level caches, the L1 cache is generally built from SRAM.c)In two-level caches the L1 cache is generally larger then L2 cache.d)In two-level caches, the L2 cache generally has a lower latency than the L1 cacheCorrect answer is option 'B'. Can you explain this answer?
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