Cache memory

Jul 20, 2012

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Cache memory

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1. Cache memory Prof. Sin-Min Lee Department of Computer Science

Cache Memory

Cache Memory Yi-Ning Huang Principle of Locality A phenomenon that the recent used memory location is more likely to be used again soon. What is cache memory? According to locality principle, Scientists designed cache memory to make memory more efficient.

1.09k views • 27 slides

Cache Memory

Cache Memory. Adapted from lectures notes of Dr. Patterson and Dr. Kubiatowicz of UC Berkeley. Revisiting Memory Hierarchy. Facts Big is slow Fast is small Increase performance by having “hierarchy” of memory subsystems “Temporal Locality” and “Spatial Locality” are big ideas .

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Cache Memory

Cache Memory. Chapter 17 S. Dandamudi. Introduction How cache memory works Why cache memory works Cache design basics Mapping function Direct mapping Associative mapping Set-associative mapping Replacement policies Write policies Space overhead. Types of cache misses Types of caches

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Cache Memory

Cache Memory. Historically, CPUs have always been faster than memories. In order to have a memory as fast as a CPU it must be located on the CPU chip. This makes the chip bigger and more expensive.

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CACHE MEMORY

CACHE MEMORY. Characteristic of Memory System. Location Processor - Requires its own local memory. Internal memory - Is often equated with main memory.

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Cache Memory

Cache Memory. By Aung Oo. Cache. Memory Cache Hard drive Cache Printer Cache CD-Rom Cache Browser Cache. What is Cache in general?. A cache is meant to improve access times and enhance the overall performance of your computer.

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Cache Memory

Cache Memory. Exercises. Questions I. Given: memory is little-endian and byte addressable; memory size; number of cache blocks, size of cache block An instruction lw $t0, x or lbu $t0, x; Determine HIT or MISS? What value is in $t0?; and Show the cache after word is brought in if needed.

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Cache Memory

Cache Memory. Characteristics. Location Capacity Unit of transfer Access method Performance Physical type Physical characteristics Organisation. Location. CPU Internal External. Capacity. Word size The natural unit of organisation Number of words or Bytes. Unit of Transfer.

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Cache Memory

Cache Memory. Ilam University. Types of Memory. Memory Hierarchy. CAPACITY. SPEED and COST. Registers. On-Chip SRAM. Off-Chip SRAM. DRAM. Disk. Why Memory Hierarchy?. Need lots of bandwidth Need lots of storage 64MB (minimum) to multiple TB Must be cheap per bit

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Cache memory

Cache memory. October 16, 2007 By: Tatsiana Gomova. The memory hierarchy. Cache memory has the fastest access time after registers. Why is cache memory needed?. When a program references a memory location, it is likely to reference that same memory location again soon.

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Cache Memory

Cache Memory. CSE 675.02. Slides from Dan Garcia, UCB. Keyboard, Mouse. Computer. Processor (active). Devices. Memory (passive) (where programs, data live when running). Input. Disk, Network. Control (“brain”). Output. Datapath (“brawn”). Display , Printer.

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Cache Memory

Cache Memory. 555-1212. Big is Slow. Consider looking up a telephone number. The more phone numbers stored, the slower the access. In your memory. In your personal organizer. In the personal directory. In the Phone book. Spatial Locality - You’re likely to call a lot of people you know

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Cache memory

Cache memory. What? Small, but fast (SRAM) memory closest to the CPU registers in the memory hierarchy. Can be on the CPU (level 1 cache), or on the motherboard (level 2 cache, usually connected via a dedicated fast bus).

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Cache Memory

Cache Memory. Yi-Ning Huang. Principle of Locality. A phenomenon that the recent used memory location is more likely to be used again soon. What is cache memory?. According to locality principle, Scientists designed cache memory to make memory more efficient.

570 views • 27 slides

Cache Memory

Cache Memory. 3. System Bus. 3.1. Computer Components :. CPU. Memory. 0. IR. MAR. Instruction. 1. Instruction. 2. MBR. PC. Instruction. I/O AR. I/O BR. Data. I/O Module. Data. Data. n. Buffers. Weaknesses of Main Memory technology.

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Cache Memory

Cache Memory. Outline. Cache mountain Matrix multiplication Suggested Reading: 6.6, 6.7. 6.6 Putting it Together: The Impact of Caches on Program Performance 6.6.1 The Memory Mountain. The Memory Mountain P512. Read throughput (read bandwidth)

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Cache Memory

Cache Memory. T1. BUS. A1 A2 A3 A4 A5. A1. A1 A2 A3 A4 A5. A1. 0123. AX BX CX CPU. RAM. A1 A2 A3 A4 A5. A1 A2 A3 A4 A5. A1. Cache. B1 B2 B3 B4 B5. C1 C2 C3 C4 C5. D1 D2 D3 D4 D5. E1 E2 E3 E4 E5. 128129130131. F1 F2 F3 F4 F5. MOV AX,A1 MOV BX,A2 MOV CX,B1.

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Cache Memory

Cache Memory. Outline. Memory Hierarchy Direct-Mapped Cache Write-Through, Write-Back Cache replacement policy Examples. Principal of Locality.

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Cache Memory

Cache Memory. By JIA HUANG. "Computer Science has only three ideas: cache, hash, trash.“ - Greg Ganger, CMU. The idea of using caching. Using very short time to access the recently and frequently data. cache: fast but expensive. disks: cheap but slow. Type of cache.

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Memory - Cache

Memory - Cache. Instructor : Sin-Min Lee Student : Chen Ying Kuo. What is Memory Chche??. a cache is a component that transparently stores data so that future requests for that data can be served faster. L1 & L2. A level 1 (L1) cache is a memory bank built into the CPU chip.

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Cache memory

Cache memory. Prof. Sin-Min Lee Department of Computer Science. CS147 Lecture 16. Problem. Implement the following state diagram using T Flip-Flop(s) and J-K Flip-Flop(s). Number Of Flip-Flops Needed. Need 2 Flip-Flops 1 T Flip-Flop 2 JK Flip-Flop. Steps To Solve The Problem.

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Cache Memory

Cache Memory. Outline. General concepts 3 ways to organize cache memory Issues with writes Write cache friendly codes Cache mountain Suggested Reading: 6.4, 6.5, 6.6. 6.4 Cache Memories. Cache Memory. History At very beginning, 3 levels Registers, main memory, disk storage

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