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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)
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
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
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
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
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
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
update based cache coherence protocol used in multi-processor systems. Write propagation is performed by directly updating all the cached values across
Dragon_protocol
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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++
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
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
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
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
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)
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
WRITE ONCE-CACHE-COHERENCE
WRITE ONCE-CACHE-COHERENCE
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WRITE ONCE-CACHE-COHERENCE