Practice Cache Memory (4.5) - Direct-mapped Caches: Misses, Writes and Performance

Practice: Cache Memory

Lesson 4.5Direct-mapped Caches: Misses, Writes and Performance

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10 questions

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6 sample questions

Question 1.
What is the purpose of cache memory?
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Think about CPU speed.
Question 2.
Define hit ratio.
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Think about successful data retrieval.
3Question 3.
What does a cache hit indicate?
- Data is retrieved from main memory
- Data is retrieved from cache
- Data is lost
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Think about the quickest way to access data.
4Question 4.
True or False: Cache memory is slower than main memory.
- True
- False
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Consider the purpose of cache.
Question 5.
A system has a cache that holds 64 blocks and a main memory of 1024 blocks. If each block in the main memory can fit into one unique cache line, determine the hit ratio if 250 requests are made and 200 are hits.
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Recall the formula for hit ratio.
Question 6.
Consider a cache memory with 16 cache lines and a block size of 4 words per cache line. Calculate how many bits of memory are allocated for the tag if the main memory has an address space of 32 bits.
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Use the size of cache and block size.

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