Lecture 15: Improving Cache Performance

Jul 31, 2012

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Lecture 15: Improving Cache Performance

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1. UTCS CS352, S07 Lecture 14 1 Lecture 15: Improving Cache Performance Last Time: Cache introduction AMAT Set associativity Today Physical cache design Replacement and write policies Cache performance optimizations

2. UTCS CS352, S07 Lecture 14 2 Cache Organization

Performance Improvement

Performance Improvement. The material for this lecture is drawn, in part, from The Practice of Programming (Kernighan & Pike) Chapter 7. Goals of this Lecture. Help you learn about: Techniques for improving program performance: how to make your programs run faster and/or use less memory

528 views • 29 slides

Improving Performance

Improving Performance. How do athletes train for improved performance? What are the planning considerations for improving performance? What ethical issues are related to improving performance?. How do athletes train for improved performance?. Content Summary: Strength training

985 views • 66 slides

Improving Performance

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The Importance of Being Local

The Importance of Being Local. More Data Than Cache. Let’s say that you have 1000 times more data than cache. Then won’t most of your data be outside the cache? YES! Okay, so how does cache help?. Improving Your Cache Hit Rate.

468 views • 34 slides

Improving Cache Performance by Exploiting Read-Write Disparity

Improving Cache Performance by Exploiting Read-Write Disparity. Samira Khan , Alaa R. Alameldeen , Chris Wilkerson, Onur Mutlu , and Daniel A. Jiménez. Summary. Read misses are more critical than write misses Read misses can stall processor, writes are not on the critical path

407 views • 27 slides

Cache Memory and Performance

Cache Memory and Performance. Many of the following slides are taken with permission from Complete Powerpoint Lecture Notes for Computer Systems: A Programmer's Perspective (CS:APP) Randal E. Bryant and David R. O'Hallaron http:// csapp.cs.cmu.edu/public/lectures.html

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Cache Memories

Cache Memories. CS213. Topics Generic cache memory organization Direct mapped caches Set associative caches Impact of caches on performance. Cache Memories. Cache memories are small, fast SRAM-based memories managed automatically in hardware.

644 views • 40 slides

Cache Performance Metrics

Cache Performance Metrics. Miss Rate Fraction of memory references not found in cache (misses/references) Typical numbers: 3-10% for L1 can be quite small (e.g., < 1%) for L2, depending on size, etc. Hit Time

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Lecture 9: Memory Hierarchy (3)

Lecture 9: Memory Hierarchy (3). Michael B. Greenwald Computer Architecture CIS 501 Fall 1999. Improving Cache Performance. Average memory-access time = Hit time + Miss rate x Miss penalty (ns or clocks) Improve performance by: 1. Reduce the miss rate, 2. Reduce the miss penalty, or

395 views • 27 slides

Cache Memory and Performance

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Cache Memories 15- 213: Introduction to Computer Systems 10 th Lecture, Sep. 23, 2010.

Cache Memories 15- 213: Introduction to Computer Systems 10 th Lecture, Sep. 23, 2010. Instructors: Randy Bryant and Dave O’Hallaron. Today. Cache memory organization and operation Performance impact of caches The memory mountain Rearranging loops to improve spatial locality

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Web Cache

Web Cache. Yee Vang. Introduction. Internet has many user Issues with access latency (lag) Server crashing How to solve? One solution, Web Cache. Web Cache. What is web cache? Cache “ a place of storage” Web cache – “a place to store websites or web objects”. Web caching.

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Performance Improvement

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Memory Hierarchy Design

Memory Hierarchy Design. Outline. Introduction Reviews of the ABCs of caches Cache Performance Reducing Cache Miss Penalty Reducing Miss Rate Reducing Cache Miss Penalty or Miss Rate Via Parallelism Reducing Hit Time Main Memory and Organizations for Improving Performance

1.89k views • 159 slides

55:035 Computer Architecture and Organization

55:035 Computer Architecture and Organization. Lecture 7. Outline. Cache Memory Introduction Memory Hierarchy Direct-Mapped Cache Set-Associative Cache Cache Sizes Cache Performance. Introduction. Memory access time is important to performance!

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Cache Performance

Cache Performance. CPI contributed by cache = CPI c = miss rate * number of cycles to handle the miss Another important metric Average memory access time = cache hit time * hit rate + Miss penalty * (1 - hit rate). Improving Cache Performance. To improve cache performance:

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Cache Memory and Performance

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Region scheduling

Region scheduling. A cache-aware scheduler for CMP environment. Abstract. Last level cache become more performance-critical HW approach Intel's smart cache NUCA (non-uniform cache architecture) SW approach Need manage cache and schedule better

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Lecture 8: Large Cache Design I

Lecture 8: Large Cache Design I. Topics: Shared vs. private, centralized vs. decentralized, UCA vs. NUCA, recent papers. Multi-Core Cache Organizations. P. P. P. P. P. P. P. P. C. C. C. C. C. C. C. C. C. C. C. C. C. C. C. C. C. C. C. C.

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CS 161 Ch 7: Memory Hierarchy LECTURE 20

CS 161 Ch 7: Memory Hierarchy LECTURE 20. Instructor: L.N. Bhuyan www.cs.ucr.edu/~bhuyan. Cache Organization. (1) How do you know if something is in the cache? (2) If it is in the cache, how to find it?. Answer to (1) and (2) depends on type or organization of the cache

271 views • 18 slides

Cache Memories

Cache Memories. CS 105 Tour of the Black Holes of Computing. Topics Generic cache memory organization Direct mapped caches Set associative caches Impact of caches on performance. cache.ppt. New Topic: Cache. Buffer, between processor and memory Often several levels of caches

543 views • 41 slides

Cache Memories

Cache Memories. Cache Memories. Cache memory organization and operation Performance impact of caches The memory mountain Rearranging loops to improve spatial locality. Cache Memories. Cache memories are small, fast SRAM-based memories managed automatically in hardware.

837 views • 40 slides

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