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Equivalence of all cached copies of a memory location
computer architecture, cache coherence is the uniformity of shared resource data that is stored in multiple local caches. In a cache coherent system, if
Cache_coherence
In cache coherency protocol literature, Write-Once was the first MESI protocol defined. It has the optimization of executing write-through on the first
Write-once_(cache_coherence)
Additional storage that enables faster access to main storage
the write policy. The two primary write policies are: Write-through: Writes are performed synchronously to both the cache and the backing store. Write-back:
Cache_(computing)
Rules that guarantee predictable computer memory operation
replication systems or web caching). Consistency is different from coherence, which occurs in systems that are cached or cache-less, and is consistency
Consistency_model
Hardware cache of a central processing unit
different cache levels. Branch predictor Cache (computing) Cache algorithms Cache coherence Cache control instructions Cache hierarchy Cache placement
CPU_cache
Examples of coherency protocols for cache memory are listed here. For simplicity, all "miss" Read and Write status transactions, which all only come from
List of cache coherency protocols
List_of_cache_coherency_protocols
Transaction tracker in computer systems
1983, under the name "write-once" cache coherency. A cache containing a coherency controller (snooper) is called a snoopy cache. When specific data are
Bus_snooping
Cache coherence protocol for computer processors
protocol is an invalidate-based cache coherence protocol, and is one of the most common protocols that support write-back caches. It is also known as the Illinois
MESI_protocol
update based cache coherence protocol used in multi-processor systems. Write propagation is performed by directly updating all the cached values across
Dragon_protocol
Open source distributed memory caching system
general-purpose distributed memory-caching system. It is often used to speed up dynamic database-driven websites by caching data and objects in RAM to reduce
Memcached
Cache coherence protocol
computing, the MSI protocol - a basic cache-coherence protocol - operates in multiprocessor systems. As with other cache coherency protocols, the letters of
MSI_protocol
Storage of digital data readable by computers
serves as disk cache and write buffer to improve both reading and writing performance. Operating systems borrow RAM capacity for caching so long as it's
Computer_data_storage
Local computer bus for attaching hardware devices
support for write-back cache coherence. This required support by cacheable memory targets, which would listen to two pins from the cache on the bus, SDONE
Peripheral Component Interconnect
Peripheral_Component_Interconnect
Computer memory that can be accessed by multiple processes
well. Most of them have ten or fewer processors; lack of data coherence: whenever one cache is updated with information that may be used by other processors
Shared_memory
Programming paradigm in which many processes are executed simultaneously
accessed (and thus should be purged). Designing large, high-performance cache coherence systems is a very difficult problem in computer architecture. As a
Parallel_computing
Type of computer memory
smaller. The downside is the need to maintain the spin coherence. Overall, the STT requires much less write current than conventional or toggle MRAM. Research
Magnetoresistive_RAM
Type of computer memory
used where speed is of greater concern than cost and size, such as the cache memories in processors. The need to refresh DRAM demands more complicated
Dynamic_random-access_memory
Type of computer memory
specification was per-byte write enables; it was designed for systems with caches and ECC memory, which always write in multiples of a cache line. Additional commands
Synchronous dynamic random-access memory
Synchronous_dynamic_random-access_memory
High-speed interconnect technology
allows devices to exchange messages, perform read and write operations, and maintain cache coherence. RapidIO follows common electrical standards, such as
RapidIO
Electronic non-volatile computer storage device
of this "rewrite" capability – they do a lot of extra work to meet a "write once rule". Although data structures in flash memory cannot be updated in completely
Flash_memory
Cache coherence protocol
A bus write request (BusUpgr) is generated once there is a processor write (PrWr) request to a block in the shared (S) state because the cache block is
MOSI_protocol
Form of non-volatile memory used in computers and other electronic devices
both in controller design and of storage, the use of large DRAM read/write caches and the implementation of memory cells which can store more than one
Read-only_memory
Electro-mechanical data storage device
magnetic heads, usually arranged on a moving actuator arm, which read and write data to the platter surfaces. Data is accessed in a random-access manner
Hard_disk_drive
Write once computer memory
digital memory where the contents are set after the device is manufactured. Once set, the contents are then permanent. A PROM is one type of read-only memory
Programmable_ROM
Data storage device
circuits. For example, the microprocessor chips that run computers contain cache memory to store instructions awaiting execution. Volatile memory loses its
Semiconductor_memory
Database class for storage and retrieval of modeled data
Comparison of structured storage software Database scalability Distributed cache Faceted search List of NoSQL software and tools MultiValue database Multi-model
NoSQL
Removable disk storage medium
supports a 32 MB capacity on standard 3½-inch HD disks, but this is a write-once technique, and requires its own drive.[citation needed] The raw maximum
Floppy_disk
Novel type of computer memory
been shown possible for a low-current ReRAM system. Modeling of 2D and 3D caches designed with ReRAM and other non-volatile random-access memories such as
Resistive random-access memory
Resistive_random-access_memory
CPU instruction to set a memory location to a flag value and return its prior value
test-and-set significantly. This slows down all other traffic from cache and coherence misses. It slows down the overall section, since the traffic is saturated
Test-and-set
Data storage device
unnecessary writes. However, some sources claim that defragmenting a flash drive can improve performance (mostly due to improved caching of the clustered
USB_flash_drive
Flat, usually circular disc that encodes binary data
(such as CD and CD-ROM), recordable (write-once, like CD-R), or re-recordable (rewritable, like CD-RW). Write-once optical discs commonly have an organic
Optical_disc
Process of encoding and decoding binary data to and from synthesized strands of DNA
currently severely limited because of its high cost and very slow read and write times. In June 2019, scientists reported that all 16 GB of text from the
DNA_digital_data_storage
Type of computer memory used from 1955 to 1975
selected while the bit sense/write lines are ignored. To write words, the half current is applied to one or more word write lines, and half current is applied
Magnetic-core_memory
Computer memory that does not lose its contents after being turned off
semiconductor non-volatile memories can be categorized according to their write mechanism. Mask ROMs are factory programmable only and typically used for
Non-volatile_memory
Magnetic tape data storage technology
or audio the ratio will be close to or equal to 1:1. New for LTO-3 was write once read many (WORM) capability. This is useful for legal record keeping,
Linear_Tape-Open
Relational database management system
data is to be cached. Once a cache group is defined, the cache group can then be "loaded", allowing Oracle Database data to be cached in TimesTen. Applications
TimesTen
Method to store and retrieve computer data using optics
MiniDisc format saw some success. In 1988, the "Orange Book" added a write-once format, CD-WO, to the existing CD format. The media was compatible with
Optical_storage
Novel computer memory type
provided by a charge pump, which takes some time to build up power. General write times for common flash devices are on the order of 100 μs (for a block of
Phase-change_memory
Distributed database
with Oracle Coherence allows OND to be used as a cache for Oracle Coherence applications, allowing applications to directly access cached data from OND
Oracle_NoSQL_Database
Novel type of computer memory
advantages over Flash include: lower power usage, faster write speeds and a much greater maximum read/write endurance (about 1010 to 1015 cycles). FeRAMs have
Ferroelectric_RAM
System property to handle growing work
Contention refers to delay due to waiting or queueing for shared resources. Coherence refers to delay for data to become consistent. For example, having a high
Scalability
When a system's behavior depends on timing of uncontrollable events
Efficient Support for and Evaluation of Relaxed Atomics" (PDF). Efficient Coherence and Consistency for Specialized Memory Hierarchies (PhD). University of
Race_condition
Microprocessor
Cache coherence is provided by the memory controllers. Each memory controller has a cache coherence engine. The Alpha 21364 uses a directory cache coherence
Alpha_21364
Type of computer memory
decryption. Much larger battery-backed memories are still used today as caches for high-speed databases that require a performance level newer NVRAM devices
Non-volatile random-access memory
Non-volatile_random-access_memory
Computer hardware technology
protected non-volatile location that can only be modified by the platform owner. Once the LCP is satisfied, the SINIT ACM allows the MLE to execute as a Trusted
Trusted_Execution_Technology
Family of 64-bit Intel microprocessors
NUMAlink4 link planes to create a 512-socket cache-coherent single-image system. A cache for the in-memory coherence directory saves memory bandwidth and reduces
Itanium
Non-volatile memory technology
physically degrades the cell, such that the cell will eventually be unwritable. Write cycles on the order of 105 to 106 are typical, limiting flash applications
Programmable metallization cell
Programmable_metallization_cell
Type of digital adder
to the end of the sum. Although we know the last digit of the result at once, we cannot know the first digit until we have gone through every digit in
Carry-save_adder
Mathematical program specifications
Mannava, S. Park, "A simple method for parameterized verification of cache coherence protocols", Formal Methods in Computer-Aided Design, pp. 382–398, 2004
Formal_methods
Processors using some version of the MIPS architecture
(soon raised to 64 KB) caches for instructions and data, and support for shared-memory multiprocessing in the form of a cache coherence protocol. While there
MIPS_architecture_processors
Use of paper as computer memory
16 pixel module. The limits of data storage depend on the technology to write and read such data. The theoretical limits assume a scanner that can perfectly
Paper_data_storage
Early type of computer memory
written in a single operation by working all of the planes at once. Between reads or writes the data was stored magnetically. This means that core memory
Twistor_memory
Interoperability for Microwave Access WIMG—Write-Through Access (W), Cache-Inhibited Access (I), Memory Coherence (M), and Guarded (G) WIMP—"windows, icons
List of computing and IT abbreviations
List_of_computing_and_IT_abbreviations
Engraved block used for printing in Arabic
printed certificates. Mamluk certificates of lower quality, detail, and coherence than Ayyubid predecessors; Printed certificates ceased shortly after.
Tarsh
Comparison between two programming languages
realized, some only theorized: Java garbage collection may have better cache coherence than the usual use of std::malloc/new for memory allocation. Nevertheless
Comparison_of_Java_and_C++
American computer company, 1982–2010
sparking the slogan "Write once, run anywhere" (WORA). While this objective was not entirely achieved (prompting the riposte "Write once, debug everywhere")
Sun_Microsystems
Representing a 3D-modeled object or dataset as a 2D projection
Max, Nelson; Hanrahan, Pat; Crawfis, Roger (1990). "Area and volume coherence for efficient visualization of 3D scalar functions". Proceedings of the
Volume_rendering
SQL database engine software
compliance when using InnoDB and NDB Cluster Storage Engines SSL support Query caching Sub-SELECTs (i.e. nested SELECTs) Built-in replication support Asynchronous
MySQL
Interpreted programming language first released in 1987
laziness." He also stated that "Perl 6 has a coherence and a consistency that Perl 5 lacks." In Perl, one could write the "Hello, World!" program as: print "Hello
Perl
Implementation of an internet protocol
additional load balancing strategies and additional options to improve coherence with certain LDAP controls and extended operations to the LDAP Load Balancer
OpenLDAP
discrimination. It was disproportionate in preserving, as Belgium argued, fiscal coherence or supervision. See Commission v United Kingdom (2001) C-98/01 and Commission
Law_of_the_European_Union
Producing images of 3D scenes
real-time rendering can work with very low sample counts and improve temporal coherence to reduce flickering. Rendering is usually limited by available computing
Rendering_(computer_graphics)
Subsystem of the Linux kernel
levels of caches for the system memory and sometimes for the video memory too. Therefore, video-memory managers should also handle the cache coherence to ensure
Direct_Rendering_Manager
Criticism of Islam's holy book
little merit. Declamation, repetition, puerility, a lack of logic and coherence strike the unprepared reader at every turn. It is humiliating to the human
Criticism_of_the_Quran
2006 coal mine explosion
section. In smaller mines, there must be caches every 1,250 feet (380 m). Operators must submit plans for cache locations within 30 days for review and
Sago_Mine_disaster
Set of computer software and specifications
translates the Java bytecode into native processor instructions at run-time and caches the native code in memory during execution. The use of bytecode as an intermediate
Java_(software_platform)
Nonlinear two-terminal fundamental circuit element
is helpful to isolate the term M(q), which characterizes the device, and write it as a differential equation. The above table covers all meaningful ratios
Memristor
are transferred between processor and accelerator, data movement and cache coherence overhead can reduce or eliminate the performance benefits of acceleration
Hardware/software_co-design
WRITE ONCE-CACHE-COHERENCE
WRITE ONCE-CACHE-COHERENCE
Girl/Female
Swedish Celtic
Strong.
Boy/Male
American, British, English
Lives Near Water
Girl/Female
British, Celtic, English, Irish, Swedish
From Britain; Exalted One; To Help
Surname or Lastname
English
English : occupational name for a watchman, Anglo-Norman French waite (of Germanic origin; compare Wachter), or from the same word in its original abstract/collective sense, ‘the watch’. There may also have been some late confusion with White.
Boy/Male
Spanish
Bringer of peace.
Surname or Lastname
English
English : occupational name for a copier of manuscripts, Old English wrītere.
Boy/Male
Latin
Son of Vukan.
Boy/Male
Armenian, Australian
Nomadic Cart
Surname or Lastname
English, Scottish, and Irish
English, Scottish, and Irish : from Middle English whit ‘white’, hence a nickname for someone with white hair or an unnaturally pale complexion. In some cases it represents a Middle English personal name, from an Old English byname, Hwīt(a), of this origin. As a Scottish and Irish surname it has been widely used as a translation of the many Gaelic names based on bán ‘white’ (see Bain 1) or fionn ‘fair’ (see Finn 1). There has also been some confusion with Wight.Translated form of cognate and equivalent names in other languages, such as German Weiss, French Blanc, Polish Białas (see Bialas), etc.Peregrine White (1620–1704), brother of Resolved, was born in Cape Cod harbor on board the Mayflower, thus becoming the first child of English descent to be born in New England. His father, William White, was the son of the rector of Barham, near Ipswich, Suffolk, England; he died in 1621 during the first winter at Plymouth Colony.
Girl/Female
Bengali, Indian
Season
Surname or Lastname
Americanized spelling of Dutch and North German Wriedt.English
Americanized spelling of Dutch and North German Wriedt.English : from Old English wride ‘twist’, ‘turn’, hence a topographic name for someone who lived by a winding stream, or perhaps a nickname for a devious man.
Surname or Lastname
English
English : variant spelling of Ince.
Surname or Lastname
English
English : habitational name from either of two places, in Greater Manchester and Merseyside, named from Welsh ynys ‘island’, ‘strip of land between two rivers’ (cf. Innes).
Boy/Male
British, English
Guard
Girl/Female
American, Australian
Storage Place
Male
French
French form of Latin Leontius, LÉONCE means "lion-like."
Boy/Male
Australian, Portuguese
White; Blond; Fair-one
Boy/Male
Irish
Observant; alert; vigorous.
Girl/Female
British, English
Bright; Pure; Name of Colour
Boy/Male
Native American
stomach ache.
WRITE ONCE-CACHE-COHERENCE
WRITE ONCE-CACHE-COHERENCE
Girl/Female
Arabic, Gujarati, Indian, Kannada, Muslim
Honour; Hospitality; Generosity
Girl/Female
English
Beautiful seacoast.
Surname or Lastname
English (Lancashire)
English (Lancashire) : habitational name, probably an altered form of Baxenden, a place near Accrington, which is named with an unattested Old English word bæcstÄn ‘bakestone’ (a flat stone on which bread was baked) + denu ‘valley’. Middle English dale was sometimes substituted for Old English denu in northern place names.
Boy/Male
Hindu, Indian, Tamil
Loser Become Winner; Loser
Girl/Female
Tamil
Dheeksha | திகà¯à®·à®¾Â
Teaching, Concentration
Girl/Female
Hindu, Indian, Telugu
A River
Boy/Male
Muslim
Nasser Udeen | ناصیر یودین
Protector of the faith
Boy/Male
Arabic, Muslim
Prize; Reward
Girl/Female
Tamil
Goddess Durga
Surname or Lastname
English and Scottish
English and Scottish : habitational name from any of numerous places named Woodhouse; there are examples in Leicestershire, South and West Yorkshire, and Peebleshire, all named from Old English wudu ‘wood’ + hūs ‘house’.William Woodhouse, a Jacobite, emigrated from Alnwick in Northumberland, England, to Philadelphia in 1766.
WRITE ONCE-CACHE-COHERENCE
WRITE ONCE-CACHE-COHERENCE
WRITE ONCE-CACHE-COHERENCE
WRITE ONCE-CACHE-COHERENCE
WRITE ONCE-CACHE-COHERENCE
n.
Something having the color of snow; something white, or nearly so; as, the white of the eye.
a.
White as snow; very white.
v. t.
To make white; to whiten; to whitewash; to bleach.
n.
One who writes, or has written; a scribe; a clerk.
Archaic imp. & p. p.
of Write
v. t.
To set down, as legible characters; to form the conveyance of meaning; to inscribe on any material by a suitable instrument; as, to write the characters called letters; to write figures.
n.
One who writes short stories, as for magazines.
adv.
By limitation to the number one; for one time; not twice nor any number of times more than one.
n.
One who is engaged in literary composition as a profession; an author; as, a writer of novels.
v. i.
Continued pain, as distinguished from sudden twinges, or spasmodic pain. "Such an ache in my bones."
adv.
At any one time; -- often nearly equivalent to ever, if ever, or whenever; as, once kindled, it may not be quenched.
n.
A white pigment; as, Venice white.
obs.
3d pers. sing. pres. of Write, for writeth.
n.
A person with a white skin; a member of the white, or Caucasian, races of men.
v. i.
To be regularly employed or occupied in writing, copying, or accounting; to act as clerk or amanuensis; as, he writes in one of the public offices.
imp.
of Write
v. t.
To set down for reading; to express in legible or intelligible characters; to inscribe; as, to write a deed; to write a bill of divorcement; hence, specifically, to set down in an epistle; to communicate by letter.