Database System Concepts
7th Edition
ISBN: 9780078022159
Author: Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher: McGraw-Hill Education
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If the request is too large for the cache, the CPU will send it to main memory, and the write buffer will return the memory block. How do we go forward?
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- The class I'm taking is assembly programming. I am completely stuck. I have attached the problem. Please view attachment before answering. Thank you so much for your help! Any help is greatly appreciated.arrow_forwardCan anything go wrong if a CPU issues a cache-unfulfilled request while pushing a block from the write buffer back to main memory?arrow_forwardDirect Mapping Example: CPU is searching an Instruction stored at RAM address 1110011010 in cache and doesn't find it. What happens then? Tag 0000000000 ?? 0000000001 ?? Block:0, (j=0) 0000000010 Instruction-1 Line1 = 1 Tag Tag 0000000011 Instruction-2 0000000100 Instruction-3 Instruction-4 Block:1, G=1) Solution: 0000000101 Line 2 (= 2) Tag 0000000110 Instruction-5 0000000111 Instruction-6 0000001100 Instruction-7 0000001101 Instruction-8 Block:2 0000001110 Data-1 (j=2) 0000001111 Data-2 Line.3 (3) 0000011100 Data-3 0000011101 Data-4 Tag 0000011110 Data-5 0000011111 Data-6 Cache Size = 64B Size of a line = 4B Total number of Lines in Cache: m 16 RAM Size = 1KB %3D 1111111100 %3D Size of a Block= 4B Total number of Blocks, M = 256 j = 0, 1, 2, ..255 (M-1) Block 255. G =255) 1111111101 1111111110 i = 0, 1, 2, ... 15 (m-1) 1111111111arrow_forward
- A write buffer will bring the data from main memory back to the CPU if it is too big to fit in the cache. What should we do next?arrow_forwardIs associative memory different from regular memory? Which one is more expensive, and why does it cost more?arrow_forwardThe STACK is a dynamic data structure. The 80x86 computer controls its stack via stack pointer ESP. Whenever you POP data out of the stack segment memory using POP BX, the 80x86 will transfer data by: Oa. a. Increasing the stack pointer ESP by 4. Ob. Decreasing the stack pointer ESP by 2. Oc. c. Decreasing the stack pointer ESP by 4. Od. Increasing the stack pointer ESP by 2.arrow_forward
- Hi, professor! I'm not sure about the following question. Consider a cache memory that provides three hundred 16-byte blocks. Now consider that you are processing all the data in a two-dimensional array of, say, four hundred rows by four hundred columns, using a pair of nested loops. Assume that the program stores the array column by column. You can write your program to nest the loops in either direction, that is, process row by row or column by column. Explain which way you would choose to process the data. What is the advantage? Conversely, what is the disadvantage of processing the data the other way? What effect does choosing the incorrect way have on system performance?arrow_forwardA computer with a 32-bit word uses an instruction format that includes direct and indirect addressing of 8 megabytes and one of 16 registers. The highest order bits are used for the opcode, followed by the bits indicating the register, followed by the indirect/direct bit, followed by the bits indicating the memory address. Draw the instruction word's format, showing how many bits are used for all four fields (Make sure to show here how many bits for each and the order in which they appear. You can submit a drawing of the word's format separatelyarrow_forwardIt is possible to serve the next process while the CPU is waiting for an interrupt. Do we really need to put off the execution? Why don't we simply execute the operation and forget about the details?arrow_forward
- What is the point of having cache memory if we already have RAM, which is a memory that is built on volatile transistors? Is it feasible for a computer to use just a single kind of memory at a time?arrow_forwardWhy do we need access to a global memory if we can just remember everything locally?arrow_forwardThere are several advantages to using dynamic memory rather than static memory, but there are also some disadvantages associated with using dynamic memory.arrow_forward
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