A direct-mapped cache consists of 8 blocks. Byte-addressable main memory contains 4K blocks of 8 bytes...
A direct-mapped cache consists of 8 blocks.
Byte-addressable main memory contains 4K blocks of 8 bytes each.
Access time for the cache is 22ns, and the time required to fill a
cache slot from main memory is 300ns. (This time allows us to
determine the block is missing and bring it into cache.) Assume a
request is always started in parallel to both cache and to main
memory(so if it is not found in cache, we do not have to add this
cache search time to the memory access). If a block is missing from
cache, the entire block is brought into the cache and the access is
restarted. Initially, the cache is empty. Now assuming a 2-way set
associative cache. If a cache set is full and a block has to be
removed to make room for another, remove the block that has been in
cache the longest (FIFO).
- Show the main memory address format that allows us to map
addresses from main memory to cache. Be sure to include the fields
as well as their sizes.
- Compute the effective access time for this program.
Homework Answers
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A direct-mapped cache consists of 8 blocks.
Byte-addressable main memory contains 4K blocks of 8 bytes...
Suppose a computer using direct mapped cache has 232 byte of byte-addressable main memory, and a...
Suppose a computer using direct mapped cache has 232 byte of byte-addressable main memory, and a cache of 1024 blocks, where each cache block contains 32 bytes. a. How many blocks of main memory are there? b. What is the format of a memory address as seen by the cache, i.e., what are the sizes of the tag, block, and offset fields? c.To which cache block will the memory address 0x000063FA map?
QUESTION 2 Suppose a computer using direct mapped cache has 216 bytes of byte-addressable main memory...
QUESTION 2 Suppose a computer using direct mapped cache has 216 bytes of byte-addressable main memory and a cache of 64 blocks, where each cache block contains 32 bytes. a. How many blocks of main memory are there? b) What is the format of a memory address as seen by the cache, (include field names and their sizes) c) To which cache block will the memory address (F8C916 map? What address in that block does it map to?
Suppose a computer using a fully associative cache has 232 bytes of byte-addressable main memory and...
Suppose a computer using a fully associative cache has 232 bytes of byte-addressable main memory and a cache of 1024 blocks, were each cache block contains 32 bytes. Consider a memory address as seen by the cache. How many bits are in the tag field?
Consider a 2-way set associative cache consisting of 8 blocks total of byte-addressable memory with 4...
Consider a 2-way set associative cache consisting of 8 blocks
total of byte-addressable memory with 4 bytes per block. Assume
that the cache is initially empty. Given the following address
sequence, fill in the table below.
Time Access Tag Set Offset 3 10010001 11001001 10110110 10101011 10110010
Suppose we have a byte-addressable computer with a cache that holds 8 blocks of 4 bytes...
Suppose we have a byte-addressable computer with a cache that holds 8 blocks of 4 bytes each. Assuming that each memory address has 8 bits and cache is originally empty, for the cache mapping technique, two-way set associative, trace how cache is used when a program accesses the following series of addresses in order: 0x01, 0x04, 0x09, 0x05, 0x14, 0x21, and 0x01.
Memory Hierarchy and Cache Consider a computer with byte-addressable memory. Addresses are 24-bits. The cache is...
Memory Hierarchy and Cache Consider a computer with byte-addressable memory. Addresses are 24-bits. The cache is capable of storing a total of 64KB of data, and frames of 32 bytes, Show the format of a 24-bit memory address for: a- Direct mapped cache b- 2-way associative cache c- 4-way associative cache d- For each type of cache above, indicate where would the reference memory address 0DEFB6 map
A direct-mapped cache has 4 blocks and each block holds four bytes of data. The memory...
A direct-mapped cache has 4 blocks and each block holds four bytes of data. The memory system is byte-addressable. Determine if each of the memory references below is a hit (H) or miss (M). You assume the cache is initially empty and memory references are given in decimal. Reference 27 0 13 24 50 24 36 14 48 45 47 48 H/M?
A direct-mapped cache has 4 blocks and each block holds four bytes of data. The memory...
A direct-mapped cache has 4 blocks and each block holds four bytes of data. The memory system is byte-addressable. Determine if each of the memory references below is a hit (H) or miss (M). You assume the cache is initially empty and memory references are given in decimal. 12 21 13 32 27 23 34 19 34 23 36 39 REFE RENC E H/M2 I
6. A 2-way set associative cache consists of four sets. Main memory contains 2K blocks of...
6. A 2-way set associative cache consists of four sets. Main memory contains 2K blocks of eight words each. a. Show the main memory address format that allows us to map addresses from main memory to cache. Be sure to include the fields as well as their sizes. b. Compute the hit ratio for a program that loops 5 times from locations 8 to 51 in main memory. You may leave the hit ratio in terms of a fraction.
Problem 6. Suppose we have a computer with 32 megabytes of main memory, 256 bytes of...
Problem 6. Suppose we have a computer with 32 megabytes of main memory, 256 bytes of cache, and a block size of 16 bytes. For each configuration below, determine the memory address format, indicating the number of bits needed for each appropriate field (i.e. tag, block, set, offset). Show any relevant calculations. Direct cache mapping and memory is byte-addressable a) Direct cache mapping and memory is word-addressable with a word size of 16 bits b) c) 2-way set associative cache...
QUESTION 2 Suppose a computer using direct mapped cache has 216 bytes of byte-addressable main memory and a cache of 64 blocks, where each cache block contains 32 bytes. a. How many blocks of main memory are there? b) What is the format of a memory address as seen by the cache, (include field names and their sizes) c) To which cache block will the memory address (F8C916 map? What address in that block does it map to?
Consider a 2-way set associative cache consisting of 8 blocks
total of byte-addressable memory with 4 bytes per block. Assume
that the cache is initially empty. Given the following address
sequence, fill in the table below.
Time Access Tag Set Offset 3 10010001 11001001 10110110 10101011 10110010
A direct-mapped cache has 4 blocks and each block holds four bytes of data. The memory system is byte-addressable. Determine if each of the memory references below is a hit (H) or miss (M). You assume the cache is initially empty and memory references are given in decimal. Reference 27 0 13 24 50 24 36 14 48 45 47 48 H/M?
A direct-mapped cache has 4 blocks and each block holds four bytes of data. The memory system is byte-addressable. Determine if each of the memory references below is a hit (H) or miss (M). You assume the cache is initially empty and memory references are given in decimal. 12 21 13 32 27 23 34 19 34 23 36 39 REFE RENC E H/M2 I
Problem 6. Suppose we have a computer with 32 megabytes of main memory, 256 bytes of cache, and a block size of 16 bytes. For each configuration below, determine the memory address format, indicating the number of bits needed for each appropriate field (i.e. tag, block, set, offset). Show any relevant calculations. Direct cache mapping and memory is byte-addressable a) Direct cache mapping and memory is word-addressable with a word size of 16 bits b) c) 2-way set associative cache...
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