Consider a memory system with a cache access time of 100ns and a memory access time of 1200ns. If the effective access time is 10% greater than the cache access time, what is the hit ratio H?
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- Consider a memory system with a cache access time of 100ns and a memory access timeof 1200ns. If the effective access time is 10% greater than the cache access time, what is thehit ratio H?If memory read cycle takes 100 ns and a cache read cycle takes 20 ns, then for four continuous references, the first one brings the main memory contents to cache and the next three from cache. Find the time taken for the Read cycle with and without Cache? What is the Percentage speedup obtained?Assume that we have a paged memory system with a cache to hold the most active page table entries. It takes 20ns to search the cache. If the page table is normally held in memory, and memory access time is lus, what is the effective access time if the hit ratio is 85%? What hit ratio will be necessary to reduce the effective memory access time to 1.1µs?
- Suppose cache has a hit rate of 0.89 and access time of 5ns, main memory has a hit rate of 0.98 and access time of 60ns, and virtual memory has an access time of 700 us (microseconds). What is the average memory access time in us?A cache memory has a line size of eight 64-bit words and a capacity of 4K words. The main memory size that is cacheable is 1024 Mbits. Assuming 4-way set associative mapping and that the addressing is done at the byte level. What is the format of the main memory addresses (i.e s-d, d, and w)? For the hexadecimal main memory location 2BFACEDH, find the corresponding 4-way set-associative memory formatGiven that a 4-way set associative cache memory has 64 KB data and each block contains 32 bytes. The main memory capacity is 4 GB. a. Find the number of bits for the main memory address. ANSWER: b. How many blocks are there in a set? ANSWER: c. How many sets the cache has? ANSWER: d. The main memory address format is => | Tag: bits | blocks sets bits | Set: e. Which set will be mapped by the main memory address 458195h. ANSWER: decimal) bits bits | Word: (in
- Consider a cache memory with blocks of 23 = words (1 word = 4 bytes) , with a bus Main Memory - Cache of 32 bits, and with 1 clock cycle to send the address, a row cycle time (DRAM) of 17 cycles (5 less clock cycles for the column access time) and 1 clock cycle to return a word. Assuming that each word is in a different DRAM row, calculate the bandwidth of the system in byte per clock cycles (bandwidth = number of bytes per clock cycles) for the transfer of one block from Main Memory to Cache Memory (not interleaved memory system). Provide the solution with at least 2 decimalsThe access time of the cache memory is 100ns and that of main memory 1000ns.It is estimated that S0percent of the memory requests are for read and the remaining 20 percent for write. The hit ratio for read accesses only is 0.9. A write through procedure is used. What is the average access time of the system considering only memory read cycles? What is the average access time of the system for both read cycles and write requests? What is the hit ratio taking into consideration the write cycles?Suppose we have a processor with a base CPI of 2.0 assuming all references hit in the pnmary cache and a clock rate of 1000 MHz. The main memory access time is 100 ns. Suppose the miss rate per instruction is 5%. What is the revised CPI? How much taster will the machine run it we put a secondary cache (with 20-ns access time) that reduces the miss rate to memory to 2%
- Find the AMAT for a processor with a 1 ns clock cycle time, a miss penalty of 20 clock cycles, a miss rate of 0.05 misses per instruction, and a cache access time (including hit detection) of 1 clock cycle. Assume that the read and write miss penalties are the same and ignore other write stalls.A 32-bit computer has a memory of 256 KB and a cache line size of 64 bytes. The memory cache access time is 5ns. This cache is 4-way associative and use LRU as a replacement algorithm. a) What is the number of lines and sets of this memory cache? b) What is the block size transferred between the cache memory and the main memory? c) If the time to transfer a line to cache memory is 200 ns, what is the hit ratio needed to obtain an average access time of 20 ns?Asap