Global Information Lookup Global Information

Cache performance measurement and metric information


A CPU cache is a piece of hardware that reduces access time to data in memory by keeping some part of the frequently used data of the main memory in a 'cache' of smaller and faster memory.

The performance of a computer system depends on the performance of all individual units—which include execution units like integer, branch and floating point, I/O units, bus, caches and memory systems. The gap between processor speed and main memory speed has grown exponentially. Until 2001–05, CPU speed, as measured by clock frequency, grew annually by 55%, whereas memory speed only grew by 7%.[1] This problem is known as the memory wall. The motivation for a cache and its hierarchy is to bridge this speed gap and overcome the memory wall.

The critical component in most high-performance computers is the cache. Since the cache exists to bridge the speed gap, its performance measurement and metrics are important in designing and choosing various parameters like cache size, associativity, replacement policy, etc. Cache performance depends on cache hits and cache misses, which are the factors that create constraints to system performance. Cache hits are the number of accesses to the cache that actually find that data in the cache, and cache misses are those accesses that don't find the block in the cache. These cache hits and misses contribute to the term average access time (AAT) also known as AMAT (average memory access time), which, as the name suggests, is the average time it takes to access the memory. This is one major metric for cache performance measurement, because this number becomes highly significant and critical as processor speed increases.

Another useful metric to test the performance is Power law of cache misses. It gives you the number of misses when you change the size of the cache, given that the number of misses for one of the cache sizes is known. Similarly, when you want to test the performance of the cache in terms of misses across different associativities, Stack distance profiling is used.

  1. ^ Hennessy, J. and Patterson, D. (2003). Computer Architecture : a Quantitative Approach,3rd edition. Morgan-Kaufmann Publishers, Inc. ISBN 9781558607248.{{cite book}}: CS1 maint: multiple names: authors list (link)

and 25 Related for: Cache performance measurement and metric information

Request time (Page generated in 0.9238 seconds.)

Cache performance measurement and metric

Last Update:

computers is the cache. Since the cache exists to bridge the speed gap, its performance measurement and metrics are important in designing and choosing various...

Word Count : 2318

CPU cache

Last Update:

For a detailed introduction to the types of misses, see cache performance measurement and metric. Most general purpose CPUs implement some form of virtual...

Word Count : 13277

Power law of cache misses

Last Update:

higher level cache, the miss rate function can be approximated to the power law. Cache hierarchy Cache performance measurement and metric Chow, C. K. (May...

Word Count : 585

Cache replacement policies

Last Update:

hardware-maintained structure can utilize to manage a cache of information. Caching improves performance by keeping recent or often-used data items in memory...

Word Count : 5238

Computer performance

Last Update:

measurable, technical terms, using one or more of the metrics listed above. This way the performance can be Compared relative to other systems or the same...

Word Count : 2841

Web performance

Last Update:

performance of the web page can be improved through techniques such as multi-layered cache, light weight design of presentation layer components and asynchronous...

Word Count : 1549

Kilobyte

Last Update:

consistent with the other uses of the metric prefixes in computing, such as CPU clock speeds or measures of performance. The international standard IEC 80000-13...

Word Count : 1581

Hardware performance counter

Last Update:

level performance metrics back to source code. The limited number of registers to store the counters often force users to conduct multiple measurements to...

Word Count : 463

Instructions per second

Last Update:

computer performance in commonly used applications, and raw IPS has fallen into disuse. The term is commonly used in association with a metric prefix (k...

Word Count : 2651

Web analytics

Last Update:

Web analytics is the measurement, collection, analysis, and reporting of web data to understand and optimize web usage. Web analytics is not just a process...

Word Count : 6064

Pentium 4

Last Update:

negatively upon the processor's performance. The two classical metrics of CPU performance are IPC (instructions per cycle) and clock speed. While IPC is difficult...

Word Count : 5303

Algorithmic efficiency

Last Update:

Because of this, cache replacement policies are extremely important to high-performance computing, as are cache-aware programming and data alignment. To...

Word Count : 3288

Time to first byte

Last Update:

Time to first byte (TTFB) is a measurement used as an indication of the responsiveness of a webserver or other network resource. TTFB measures the duration...

Word Count : 668

Thermal design power

Last Update:

SPECjbb2005 and STREAM Benchmark (memory bandwidth), which AMD said is an appropriate method of power consumption measurement for data centers and server-intensive...

Word Count : 1412

Computer architecture

Last Update:

CPU. However, this metric is somewhat misleading, as a machine with a higher clock rate may not necessarily have greater performance. As a result, manufacturers...

Word Count : 3230

RIPE Atlas

Last Update:

Disruptions, and Shutdowns Characterizing User-to-User Connectivity with RIPE Atlas Measurement Vantage Point Selection Using A Similarity Metric Disco: Fast...

Word Count : 2893

Software Guard Extensions

Last Update:

advisory and mitigation for this attack, also called a Processor Data Leakage or Cache Eviction, was originally issued January 27, 2020 and updated May...

Word Count : 2058

Standard RAID levels

Last Update:

identifiers and do not signify performance, reliability, generation, or any other metric. While most RAID levels can provide good protection against and recovery...

Word Count : 4529

Binary prefix

Last Update:

binary prefix is a unit prefix that indicates a multiple of a unit of measurement by an integer power of two. The most commonly used binary prefixes are...

Word Count : 8723

Trusted Execution Technology

Last Update:

Module (TPM) and cryptographic techniques to provide measurements of software and platform components so that system software as well as local and remote management...

Word Count : 1536

Comparison of video codecs

Last Update:

performance than codec B. Meanwhile, the same pair of codecs may give opposite results if running on an older computer with reduced memory (or cache)...

Word Count : 2834

Mobile web analytics

Last Update:

Handset caching mechanisms impact the use of images for page tagging. In some cases, image caching on handsets is performed regardless of any anti-caching headers...

Word Count : 1231

IBM System Management Facilities

Last Update:

Resource Measurement Facility (RMF). RMF provides performance and usage instrumentation of resources such as processor, memory, disk, cache, workload...

Word Count : 1355

University of Illinois Center for Supercomputing Research and Development

Last Update:

cache hierarchy. Several papers were published demonstrating performance enhancement for basic linear algebra algorithms on the Alliant quadrants and...

Word Count : 6992

Byte

Last Update:

such as main memory and CPU cache size, and in marketing and billing by telecommunication companies, such as Vodafone, AT&T, Orange and Telstra. For storage...

Word Count : 6690

PDF Search Engine © AllGlobal.net