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The following data constitutes a stream of virtual addresses as seen on a system. Assume 4...
As described in 5.7, virtual memory uses a page table to track the mapping of virtual...
As described in 5.7, virtual memory uses a page table to track the mapping of virtual addresses to the physical addresses. This exercise shows how this table must be updated as addresses are accessed. The following data constitutes a stream of virtual addresses as seen on a system. Assume 4 KiB pages, a 4-entry fully associative TLB, and true LRU replacement. If pages must be brought in from disk, increment the next largest page number. 4669, 2227, 13916, 34587, 48870,...
Consider the following system: Byte addressable 16-bit addresses 256B pages Single level Page Table System The...
Consider the following system: Byte addressable 16-bit addresses 256B pages Single level Page Table System The system utilizes a fully-associative TLB with 4 entries and an LRU replacement policy. Given the access pattern and timings below, complete the following table. Assume the TLB begins initially empty and the cache is physically addressed NOTE: Access times are not inclusive and components are accessed sequentially. Time to update the TLB is negligible, everything else that needs to be updated will require a...
Assume you have: 32-bit addresses, 4KB Page size, 4MB Physical Memory Space, 4KB Cache with 4-way...
Assume you have: 32-bit addresses, 4KB Page size, 4MB Physical Memory Space, 4KB Cache with 4-way set associative and LRU replacement, 32 Byte Cache block size, 4-entry fully associative TLB. A program to be run on this machine begins as follows: double A[1024]; int i, j; double sum = 0; for( i = 0; i < 1024; i++ ) // first loop A[i] = i; for( j = 0; j < 1024; j += 16 ) // second loop ...
3. Virtual Memory (20 points) An ISA supports an 8 bit, byte-addressable virtual address space. The...
3. Virtual Memory (20 points) An ISA supports an 8 bit, byte-addressable virtual address space. The corresponding physical memory has only 256 bytes. Each page contains 32 bytes. A simple, one-level translation scheme is used and the page table resides in physical memory. The initial contents of the frames of physical memory are shown below. VALUE address size 8 bit byte addressable each byte of addressing type memory has its own address 32 B page size physical memory size 256...
Using the sequences of 32-bit memory read references, given as word addresses in the following table:...
Using the sequences of 32-bit memory read references, given as word addresses in the following table: 6 214 175 214 6 84 65 174 64 105 85 215 For each of these read accesses, identify the binary address, the tag, the index, and whether it experiences a hit or a miss, for each of the following cache configurations. Assume the cache is initially empty. A direct-mapped cache with 16 one-word blocks. A direct-mapped cache with two-word blocks and a total...
Question 31 supus Given a computer using a byte-addressable virtual memory system with a two-entry TLB,...
Question 31 supus Given a computer using a byte-addressable virtual memory system with a two-entry TLB, a 2-way set associative cache, and a page table for a process P. Assume cache blocks of size 16 bytes. Assume pages of size 32 bytes and a main memory of 4 frames. Assume the following TLB and page table for Process P: TLB 03 4 هما 0 1 2 3 4 5 6 7 Page Table f Vali d 1 1 0 2...
Question 1 Which of the following is true about virtual addresses? Virtual addresses for the same...
Question 1 Which of the following is true about virtual addresses? Virtual addresses for the same physical memory location may differ from process to process Virtual addresses are synonymous with physical addresses Virtual addresses always refer to locations on disk Virtual addresses for the same physical memory location may differ from thread to thread Question 2 How do pages and frames relate to each other? A page holds words while a frame holds pictures A frame is a larger structure...
1) Given a virtual memory system with: virtual address 36 bits physical address 32 bits 32KB...
1) Given a virtual memory system with: virtual address 36 bits physical address 32 bits 32KB pages (15 bit page offset) Each page table entry has bits for valid, execute, read and dirty (4 bits total) and bits for a physical page number. a) How many bits in the page table? (do not answer in bytes!) Three digit accuracy is good enough. The exponent may be either a power of 2 or a power of 10. b) The virtual address...
4. Assume it take 50 nanoseconds to resolve a memory reference when accessing the physical memory address directly. a) We designed a system using virtual addresses with page tables without a TLB. In...
4. Assume it take 50 nanoseconds to resolve a memory reference when accessing the physical memory address directly. a) We designed a system using virtual addresses with page tables without a TLB. In other words, when fetching data from memory, the page table is accessed to get the PTE for translating an address, a translation is completed, and finally, a memory reference to the desired data is resolved. In this system, what is the effective memory reference time. Assume the...
Assume a memory model where you have a cache size of 4 blocks, a block size of 8, and addresses f...
Assume a memory model where you have a cache size of 4 blocks, a block size of 8, and addresses from 0 through 511. Assume that the n-way associative cache and fully associative cache use a LRU (least recently used) eviction strategy. Consider the following sequence of memory accesses: 17, 66, 22, 66, 80, 41, 85, 66, 17, 104. (a) Show the updates to a 2-way associative cache in a table using a similar format to the table shown on...
As described in 5.7, virtual memory uses a page table to track the mapping of virtual addresses to the physical addresses. This exercise shows how this table must be updated as addresses are accessed. The following data constitutes a stream of virtual addresses as seen on a system. Assume 4 KiB pages, a 4-entry fully associative TLB, and true LRU replacement. If pages must be brought in from disk, increment the next largest page number. 4669, 2227, 13916, 34587, 48870,...
Consider the following system: Byte addressable 16-bit addresses 256B pages Single level Page Table System The system utilizes a fully-associative TLB with 4 entries and an LRU replacement policy. Given the access pattern and timings below, complete the following table. Assume the TLB begins initially empty and the cache is physically addressed NOTE: Access times are not inclusive and components are accessed sequentially. Time to update the TLB is negligible, everything else that needs to be updated will require a...
3. Virtual Memory (20 points) An ISA supports an 8 bit, byte-addressable virtual address space. The corresponding physical memory has only 256 bytes. Each page contains 32 bytes. A simple, one-level translation scheme is used and the page table resides in physical memory. The initial contents of the frames of physical memory are shown below. VALUE address size 8 bit byte addressable each byte of addressing type memory has its own address 32 B page size physical memory size 256...
Question 31 supus Given a computer using a byte-addressable virtual memory system with a two-entry TLB, a 2-way set associative cache, and a page table for a process P. Assume cache blocks of size 16 bytes. Assume pages of size 32 bytes and a main memory of 4 frames. Assume the following TLB and page table for Process P: TLB 03 4 هما 0 1 2 3 4 5 6 7 Page Table f Vali d 1 1 0 2...
Question 1 Which of the following is true about virtual addresses? Virtual addresses for the same physical memory location may differ from process to process Virtual addresses are synonymous with physical addresses Virtual addresses always refer to locations on disk Virtual addresses for the same physical memory location may differ from thread to thread Question 2 How do pages and frames relate to each other? A page holds words while a frame holds pictures A frame is a larger structure...
4. Assume it take 50 nanoseconds to resolve a memory reference when accessing the physical memory address directly. a) We designed a system using virtual addresses with page tables without a TLB. In other words, when fetching data from memory, the page table is accessed to get the PTE for translating an address, a translation is completed, and finally, a memory reference to the desired data is resolved. In this system, what is the effective memory reference time. Assume the...
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