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In a memory hierarchy organization with three levels of caches and main memory assume that: Cache...
(a) A computer system with a cache memory has an average memory access time of TM=...
(a) A computer system with a cache memory has an average memory access time of TM= 50 ns with a hit ratio of h= 80%. The primary memory access time is TP=120 ns. What is the cache memory access time, TC?
2. Cache hierarchy You are building a computer system with in-order execution that runs at 1...
2. Cache hierarchy You are building a computer system with in-order execution that runs at 1 GHz and has a CPI of 1, with no memory accesses. The memory system is a split L1 cache. Both the I-cache and the D-cache are direct mapped and hold 32 KB each, with a block size of 64 bytes. The memory system is split L1 cache. Both the I-cache and the D-cache are direct mapped and hold 32 KB each, with a block...
Consider a memory hierarchy using one of the three organization for main memory shown in a...
Consider a memory hierarchy using one of the three organization for main memory shown in a figure below. Assume that the cache block size is 32 words, That the width of organization b is 4 words, and that the number of banks in organization c is 2. If the main memory latency for a new access is 10 cycles, sending address time is 1 cycle and the transfer time is 1 cycle, What are the miss penalties for each of...
For a special computer system with 3 levels of cache, here are the hit times and...
For a special computer system with 3 levels of cache, here are
the hit times and miss % for the different levels of cache
Please calculate the access time for this computer system.
Hit Miss% L1 Cache 1 Cycle 5% L2 Cache 5 Cycles 10% L3 Cache 20 Cycles 15% Main Memory 100 Cycles 20%
6. Memory Access Time [15 points] Consider a MIPS processor that includes a cache, a main...
6. Memory Access Time [15 points] Consider a MIPS processor that includes a cache, a main memory, and a hard drive. Access times of cache memory, main memory, and hard drive are 5 ns, 200 ns, and 1000 ns, respectively. Assume that cache memory is divided into instruction cache and data cache. Assume that data cache has a 90% hit rate. Assume that main memory has a 98% hit rate and hard drive is perfect (it has a 100% hit...
a) Calculate the AMAT for a cache system with one level of cache between the CPU...
a) Calculate the AMAT for a cache system with one level of cache between the CPU and Main Memory. Assume that the cache has a hit time of 1 cycle and a miss rate of 11%. Assume that the main memory requires 300 cycles to access (this is the hit time) and that all instructions and data can be found in the main memory (there are no misses). b) Let us modify the cache system from part (a) and add...
A new smartphone just out on the market has a L1 cache with an access time...
A new smartphone just out on the market has a L1 cache with an access time of 1 cycle, an L2 cache with an access time of 5 cycles and DRAM with access time of 30 cycles. The latest benchmarks indicate that for most applications the L1 hit rate is 80% and L2 hit rate is 95%. Compute the Average Memory Access Time for the memory hierarchy in this device. (More interested in the explanation of how to get the...
Suppose in the worst-case scenario none of the request and response transactions can be overlapped. Calculate...
Suppose in the worst-case scenario none of the request and
response transactions can be overlapped. Calculate the estimated
average memory latency, assuming that every SDRAM access (from the
time a row address is issued until the first data item appears on
the bus) takes five SDRAM clock cycles. Ignore the time required to
deactivate a row.
Ic and D: Latency 1 ns, hit ratio-0.95 (assume the same for both caches) L2 cache: Cache line 332 B, latency 33 ns, hit...
7.3 What is the memory layout of the 16-bit value, 0x7654 in a big-endian 16-bit machine,...
7.3 What is the memory layout of the 16-bit value, 0x7654 in a big-endian 16-bit machine, and a little-endian 16-bit machine? b. What would the layouts be in 32-bit machines? 7.19 A certain two-way set-associative cache has an access time of 4 ns, compared to a miss time of 60 ns. Without the cache, main memory access time was 50 ns. Running a set of bench-marks with and without the cache indicated a speedup of 90%. What is the approximate...
Operating Systems Questions (Please help if you can) 1. A computer has cache, main memory, and...
Operating Systems Questions (Please help if you can) 1. A computer has cache, main memory, and a disk used for virtual memory. If a referenced word is in the cache, 20ns are required to access it. If it is in main memory but not in the cache, 60ns are required to load it into the cache (this includes the time to originally check the cache), and then, the reference is started again. If the word is not in main memory,...
Consider a memory hierarchy using one of the three organization for main memory shown in a figure below. Assume that the cache block size is 32 words, That the width of organization b is 4 words, and that the number of banks in organization c is 2. If the main memory latency for a new access is 10 cycles, sending address time is 1 cycle and the transfer time is 1 cycle, What are the miss penalties for each of...
For a special computer system with 3 levels of cache, here are
the hit times and miss % for the different levels of cache
Please calculate the access time for this computer system.
Hit Miss% L1 Cache 1 Cycle 5% L2 Cache 5 Cycles 10% L3 Cache 20 Cycles 15% Main Memory 100 Cycles 20%
Suppose in the worst-case scenario none of the request and
response transactions can be overlapped. Calculate the estimated
average memory latency, assuming that every SDRAM access (from the
time a row address is issued until the first data item appears on
the bus) takes five SDRAM clock cycles. Ignore the time required to
deactivate a row.
Ic and D: Latency 1 ns, hit ratio-0.95 (assume the same for both caches) L2 cache: Cache line 332 B, latency 33 ns, hit...
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