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Topic: Cache memory

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In the News (Fri 14 Dec 18)

The disk cache is controlled by the embedded computer in the disk drive, where the page cache is controlled by the computer to which that disk is attached.
The disk cache is usually quite small, 2 to 8 MB, where the page cache is generally all unused physical memory, which in a 2004 PC may be between 20 and 2000 MB.
The cache of disk sectors in main memory is usually managed by the operating system kernel or file system.
www.brainyencyclopedia.com /encyclopedia/c/ca/cache.html   (936 words)

 GameDev.net - Game Dictionary
Cache memory, utilized on machines such as the IBM System/360 Model 91 as early as 1968, was created to address the von Neumann bottleneck.
In the event of a cache miss, a block of memory in the cache is replaced with the desired block of memory which exists in main memory (M2).
The transfer of memory from the cache to the CPU is much faster than the transfer of memory from main memory to the cache, which makes cache memory a good technique for speeding up data processing (Hayes, 1998).
www.gamedev.net /dict/term.asp?TermID=244   (430 words)

 Encyclopedia: Cache memory   (Site not responding. Last check: 2007-10-21)
In computer science, a cache is a collection of data duplicating original values stored elsewhere or computed earlier, where the original data is expensive (usually in terms of access time) to fetch or compute relative to reading the cache.
Once data is stored in the cache, future use of it can be made by accessing the cached copy rather than refetching or recomputing the original data, so that the average access time is lower.
Caches have proved extremely effective in many areas of computing, because access patterns in typical computer applications have locality of reference.
www.nationmaster.com /encyclopedia/Cache-memory   (1114 words)

 CPU cache -- Facts, Info, and Encyclopedia article   (Site not responding. Last check: 2007-10-21)
As long as most memory accesses are to cached memory locations, the average (The state of being not yet evident or active) latency of memory accesses will be closer to the cache latency than to the latency of main memory.
Like a virtually tagged cache, there may be a virtual hint match but physical tag mismatch, in which case the cache entry with the matching hint must be evicted so that cache accesses after the cache fill at this address will have just one hint match.
Because cache reads are the most common operation that take more than a single cycle, the recurrence from a load instruction to an instruction dependent on that load tends to be the most critical path in well-designed processors, so that data on this path wastes the least amount of time waiting for the clock.
www.absoluteastronomy.com /encyclopedia/c/cp/cpu_cache2.htm   (6850 words)

 Cache Memory
Cache memory doesn't know anything about data structures at all, so the simple and not very useful answer to your question is that data structures are treated by the cache memory the same as everything else.
Cache memory attempts to bridge the gap between fast, expensive memory that can be made in limited quantities, and the large amounts of RAM needed for modern applications.
In general, though, cache memory works by attempting to predict which memory the processor is going to need next, and loading that memory before the processor needs it, and saving the results after the processor is done with it.
www.newton.dep.anl.gov /askasci/comp99/CS035.htm   (930 words)

 Cache memory   (Site not responding. Last check: 2007-10-21)
This is normally the width of the data bus between the cache memory and the main memory.
An associative memory, or content addressable memory, has the property that when a value is presented to the memory, the address of the value is returned if the value is stored in the memory, otherwise an indication that the value is not in the associative memory is returned.
The way size, or degree of associativity, of a cache also has an effect on the performance of a cache; the same reference determined that, for a fixed cache size, there was a roughly constant ratio between the performance of caches with a given set associativity and direct-mapped caches, independent of cache size.
www.cs.mun.ca /~paul/cs3725/material/web/notes/node3.html   (2225 words)

 Cache Memory Encyclopedia Article, Definition, History, Biography   (Site not responding. Last check: 2007-10-21)
In computer science, a cache (pronounced kăsh) is a collection of data duplicating original values stored elsewhere or computed earlier, where the original data are expensive (usually in terms of access time) to fetch or compute relative to reading the cache.
Caches have proven extremely effective in many areas of computing, because access patterns in typical computer applications have locality of reference.
An example of this type of caching is ccache, a program that caches the output of the compilation to speed up the second-time compilation.
www.stardustmemories.com /encyclopedia/Cache_memory   (1761 words)

 Memory Upgrades: The Relationship Between Cache and Main Memory
Main memory is the primary bin for holding the instructions and data the processor is using.
The cache memory is similar to the main memory but is a smaller bin that performs faster.
Operating systems and applications use cache memory to store data or instructions that the processor is working with at the time, or is predicted to work with shortly; this allows the processor to get information quickly from the faster cache memory.
www.intel.com /design/chipsets/applnots/memory.htm   (1060 words)

 What is cache? - A Word Definition From the Webopedia Computer Dictionary
A memory cache, sometimes called a cache store or RAM cache, is a portion of memory made of high-speed static RAM (SRAM) instead of the slower and cheaper dynamic RAM (DRAM) used for main memory.
Memory caching is effective because most programs access the same data or instructions over and over.
Disk caching can dramatically improve the performance of applications, because accessing a byte of data in RAM can be thousands of times faster than accessing a byte on a hard disk.
www.webopedia.com /TERM/c/cache.html   (746 words)

 The PC Technology Guide
The system memory is the place where the computer holds current programs and data that are in use, and, because of the demands made by increasingly powerful software, system memory requirements have been accelerating at an alarming pace over the last few years.
With a large amount of memory, the difference in time between a register access and a memory access is very great, and this has resulted in extra layers of "cache" in the storage hierarchy.
One solution is to use "cache memory" between the main memory and the processor, and use clever electronics to ensure that the data the processor needs next is already in cache.
www.pctechguide.com /03memory.htm   (190 words)

Cache is a high-speed access area that can be either a reserved section of main memory or a storage device.
Memory cache is a portion on memory of high-speed static RAM (SRAM) and is effective because most programs access the same data or instructions over and over.
A cache server is a computer or network device that has been setup to store web pages that have been accessed by users on a large network.
www.computerhope.com /jargon/c/cache.htm   (405 words)

Cache sits on newer processor as L1 (level 1) memory and as L2 memory.
The cache minimizes the number of outgoing transactions from the CPU, it sends and receives information from the system memory and passes it to the CPU so the CPU can do more of its work internally thus speeding overall pc performance.
This is a super fast RAM and isn't cheap, the L1 cache has a much lower latency than L2 cache that is why most L1 cache's have 32-64kb as the cost is much higher, and L2 have 512kb to 2MB.
www.waterwheel.com /Guides/memory/memory_cache.htm   (407 words)

 cache memory - a Whatis.com definition   (Site not responding. Last check: 2007-10-21)
Cache memory is random access memory (RAM) that a computer microprocessor can access more quickly than it can access regular RAM.
As the microprocessor processes data, it looks first in the cache memory and if it finds the data there (from a previous reading of data), it does not have to do the more time-consuming reading of data from larger memory.
Cache memory is sometimes described in levels of closeness and accessibility to the microprocessor.
searchstorage.techtarget.com /sDefinition/0,,sid5_gci211730,00.html   (186 words)

 Cache Memory   (Site not responding. Last check: 2007-10-21)
Cache memory is used to increase the performance of a computer system, as studies have shown that most programs execute the same code and access the same data in a looping fashion.
Cache memory is small, expensive, but fast memory that sits between the processor and main memory.
Memory access time is defined as the average amount of time needed to read a unit of data from memory and is typically denoted as t
www.unf.edu /~swarde/Memory_Organization/Cache_Memory/cache_memory.html   (219 words)

 cache - a Whatis.com definition - see also: cached
A disk cache (either a reserved area of RAM or a special hard disk cache) where a copy of the most recently accessed data and adjacent (most likely to be accessed) data is stored for fast access.
L2 cache memory, which is on a separate chip from the microprocessor but faster to access than regular RAM.
Also see: buffer, which, like a cache, is a temporary place for data, but with the primary purpose of coordinating communication between programs or hardware rather than improving process speed.
whatis.techtarget.com /definition/0,,sid9_gci211728,00.html   (423 words)

 Proxy Caching
When W3C httpd is run as a proxy it can perform caching of the documents retrieved from remote hosts to make futher requests faster.
Caching is normally turned implicitly on by specifying the Cache Root Directory, but it can be explicitly turned on and off by
Note that the cache refresh happens only if and when the document is requested, so if you have a refresh interval of 2 hours it doesn't mean that all the files in cache are fetched every two hours.
www.w3.org /Daemon/User/Config/Caching.html   (1277 words)

 Gamasutra - Features - "Leveraging the Power of Cache Memory" [04.09.99]
While it worked fine for a while, over the years the rift between processor speed and memory access time became greater, and it became obvious that by opening the fl box of cache memory and exploring the contents within, we’d find solutions to the widening performance gap.
Because on the first pass, the image data is absent from the cache (assuming that we’re working on a processor without a prefetch instruction).
The main handicap of cache memory is its lack of determinism and the difficulty we encounter when trying to tune its performance.
gamasutra.com /features/19990409/cache_01.htm   (722 words)

 FAQ of Caching Mechanism
This document describes the caching mechanism in use the 331 release of the client source.
Depending upon the cache restrictions on the cache item, it will be added either to the disk or to the memory cache.
When the cache has been operational for a while, and the amount of available space for a new item becomes insufficient, the cache deletes approximately 10% of its size to make space for the item.
www.mozilla.org /docs/netlib/cachefaq.html   (838 words)

 Reading Cache Memory
That is what the cache memory is there for--to automatically increase the execution speed of your program by temporarily caching the contents of main memory.
If you wish to use the cache as "extra memory" for your data, this is not how the cache works, and not what it was designed for.
The cache controller copies areas of main memory that it thinks are going to be needed to the cache memory, which the processor can then access at high speeds.
www.newton.dep.anl.gov /askasci/comp99/CS044.htm   (539 words)

 Cache memory
Cache memory allocates memory for the hash table, the FAT, the Turbo FAT, suballocation tables, the directory cache, a temporary data storage area for files and NLM files, and available memory for other functions.
If the cache memory uses the default block size and a file takes more than one block, the file is placed in a second noncontiguous block both in cache memory and on the volume (on the hard disks).
Since writes to disk take longer to perform than writes to cache, the server keeps the dirty buffer designation on the file in cache until the disk has received the file.
www.novell.com /documentation/nw4/cncptenu/data/hlv5t648.html   (524 words)

 An illustrated Guide to CPU improvements
Cache RAM becomes especially important in clock doubled CPUs, where internal clock frequency is much higher than external.
Then the cache RAM enhances the "horsepower" of the CPU, by allowing faster receipt or delivery of data.
The next layer is the L2 cache, which are small SRAM chips on the motherboard.
www.karbosguide.com /hardware/module3b2.htm   (419 words)

 Help with Memory - Troubleshooting Memory & Cache
The good news in memory is, if it is bad it usually occurs when you first get the system.
Another thing to consider is memory error don't always occur till you make use of high memory areas.
When you get a parity error it will usually give a memory address that you can pinpoint where the problem is. On non-parity which many of us have the problem is wider.
www.waterwheel.com /Guides/Trouble_Shooting/memory/memory.htm   (561 words)

 A Fast and Accurate Approach to Analyze Cache Memory Behavior - Vera, Llosa, Gonz, Nerina (ResearchIndex)   (Site not responding. Last check: 2007-10-21)
In order to overcome this problem, cache memories are very useful.
To apply most of these transformations, the compiler requires a precise knowledge of the locality of the different sections of the code, both before and after being transformed.
Cache Miss Equations (CME) allow to obtain an analytical and precise description of...
citeseer.ist.psu.edu /vera00fast.html   (632 words)

 cache - Glossary - CNET.com   (Site not responding. Last check: 2007-10-21)
Caches come in many types, but they all work the same way: they store information where you can get to it fast.
A Web browser cache stores the pages, graphics, sounds, and URLs of online places you visit on your hard drive; that way, when you go back to the page, everything doesn't have to be downloaded all over again.
Of course, disk access is slower than RAM access, so there's also disk caching, which stores information you might need from your hard disk in faster RAM.
www.cnet.com /Resources/Info/Glossary/Terms/cache.html   (110 words)

 [No title]   (Site not responding. Last check: 2007-10-21)
The modified cache block is written to main memory only when it is replaced.
That is why we believe Memory System design will become more and more important in the future because getting to your DRAM will become one of the biggest bottlenecks.
In order to take advantage of the temporal locality, that is the locality in time, the memory hierarchy will keep those more recently accessed data items closer to the processor because chances are (points to the principle), the processor will access them again soon.
www.cse.lehigh.edu /~mschulte/ece201-02/lect/lec14.ppt   (1062 words)

 MemoKit - Computer memory manager and optimizer, virtual memory and cache optimizer
Memory is most crucial in computer speed and stability.
Gary Johnson, US I was looking for something to speed up my machine, perhaps by better utilizing the memory or the cache or something.
Here it is. A tiny adjustable toolbar or a full-featured Main window with all the information you may need about your PC resources, memory, running visible and hidden applications.
www.memokit.com   (1175 words)

 Howstuffworks "How Caching Works"
It turns out that caching is an important computer-science process that appears on every computer in a variety of forms.
There are memory caches, hardware and software disk caches, page caches and more.
Virtual memory is even a form of caching.
www.howstuffworks.com /cache.htm   (107 words)

 Amazon.com: Books: Cache and Memory Hierarchy Design : A Performance Directed Approach (The Morgan Kaufmann Series in ...   (Site not responding. Last check: 2007-10-21)
Caches are by far the simplest and most effective mechanism for improving computer performance.
This innovative book exposes the characteristics of performance-optimal single and multi-level cache hierarchies by approaching the cache design process through the novel perspective of minimizing execution times.
Trade-offs between cache size, block size, and set associativity are modeled and graphed very carefully, and the tradeoffs discussed in-depth.
www.amazon.com /exec/obidos/tg/detail/-/1558601368?v=glance   (1003 words)

 Amazon.com: Books: Cache Memory Book, The (The Morgan Kaufmann Series in Computer Architecture and Design)   (Site not responding. Last check: 2007-10-21)
Its explanations about how caches work and the different policies that must be addressed by a cache designer are among the best Ive ever read.
Being a digital design engineer, I wanted a book that would provide an insight into the way caches are used to solve the classic memory bandwidth problem.
The second chapter is a killer one and focusses in-depth on the tricks that can be used for squeeze more performance out of the basic cache implementation and the issue that might pop up.
www.amazon.com /exec/obidos/tg/detail/-/0123229804?v=glance   (907 words)

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