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RAM consistency methods in multicore computers
Memory coherence is an issue that affects the design of computer systems in which two or more processors or cores share a common area of memory. In a
Memory_coherence
Topics referred to by the same term
Cache coherence, a special case of memory coherence Memory coherence, a concept in computer architecture In scrum and agile methodologies, coherence is defined
Coherence
Computer memory architecture
cache coherence circuits and network interface controllers. There are three ways of implementing DSM: page-based approach using virtual memory, shared-variable
Distributed_shared_memory
Equivalence of all cached copies of a memory location
cached copy of the same region of a shared memory resource, all copies are the same. Without cache coherence, a change made to the region by one client
Cache_coherence
Type of memory used on processors that require high transfer rate memory
High Bandwidth Memory (HBM) is a computer memory interface for 3D-stacked synchronous dynamic random-access memory (SDRAM), initially developed by Samsung
High_Bandwidth_Memory
Early form of read-only memory
Core rope memory is a form of read-only memory (ROM) for computers. It was used in the UNIVAC I (Universal Automatic Computer I) and the UNIVAC II, developed
Core_rope_memory
Form of non-volatile memory used in computers and other electronic devices
Read-only memory (ROM) is a form of non-volatile memory used in computers and other electronic devices. Data stored in ROM cannot be electronically modified
Read-only_memory
Storage of digital data readable by computers
Generally, the faster and volatile storage components are referred to as "memory", while slower persistent components are referred to as "storage". This
Computer_data_storage
Electronic non-volatile computer storage device
Flash memory is an electronic non-volatile computer memory storage medium that can be electrically erased and reprogrammed. The two main types of flash
Flash_memory
Type of computer memory
random-access memory (dynamic RAM or DRAM) is a type of random-access semiconductor memory that stores each bit of data in a memory cell. A DRAM memory cell usually
Dynamic_random-access_memory
Intel cache and memory coherence protocol
protocol is a cache coherency and memory coherence protocol developed by Intel for cache coherent non-uniform memory architectures. The protocol consists
MESIF_protocol
Component that stores information
located in computer memory. The terms memory, main memory, and primary storage are also used for computer memory. Computer memory is often referred to
Computer_memory
Computer memory architecture
In computer architecture, the memory hierarchy separates computer storage into a hierarchy based on response time. Since response time, complexity, and
Memory_hierarchy
Data storage device
(also known as a thumb drive) is a data storage device that includes flash memory with an integrated USB interface. A typical USB drive is removable, rewritable
USB_flash_drive
Type of computer memory
Static random-access memory (static RAM or SRAM) is a type of random-access memory (RAM) that uses latching circuitry (flip-flop) to store each bit. SRAM
Static_random-access_memory
Novel computer memory type
Phase-change memory (also known as PCM, PCME, PRAM, PCRAM, OUM (ovonic unified memory) and C-RAM or CRAM (chalcogenide RAM)) is a type of non-volatile
Phase-change_memory
Form of computer data storage
Random-access memory (RAM; /ræm/) is a form of electronic computer memory that can be read and changed in any order, typically used to store working data
Random-access_memory
Computer memory that loses its contents when unpowered
Volatile memory, in contrast to non-volatile memory, is computer memory that requires power to maintain the stored information; it retains its contents
Volatile_memory
Multi-core microprocessor microarchitecture
Computer Systems and specialized arcade system boards. Cell emphasizes memory coherence, power efficiency, and peak computational throughput, but its design
Cell_(processor)
Type of computer memory used from 1955 to 1975
magnetic-core memory is a form of random-access memory. It predominated for roughly 20 years between 1955 and 1975, and is often just called core memory, or, informally
Magnetic-core_memory
Computer memory that does not lose its contents after being turned off
Non-volatile memory (NVM) or non-volatile storage is a type of computer memory that can retain stored information even after power is removed. In contrast
Non-volatile_memory
Data storage device
Semiconductor memory is a digital electronic semiconductor device used for digital data storage, such as computer memory. It typically refers to devices
Semiconductor_memory
Obsolete type of non-volatile computer memory
Bubble memory is a type of non-volatile computer memory that uses a thin film of a magnetic material to hold small magnetized areas, known as bubbles or
Bubble_memory
Type of computer memory
Synchronous dynamic random-access memory (synchronous dynamic RAM or SDRAM) is any DRAM where the operation of its external pin interface is coordinated
Synchronous dynamic random-access memory
Synchronous_dynamic_random-access_memory
Open standard processor interconnection for data centers
devices implement two memory coherence modes, managed by device driver. In device bias mode, device directly accesses local memory, and no caching is performed
Compute_Express_Link
Computer memory type used for data preservation
laser writing process. It is also branded Superman memory crystal, in reference to the Kryptonian memory crystals from the Superman franchise. Discs using
5D_optical_data_storage
Early type of computer memory
electronic computer memory, delay-line memory was a refreshable memory, but as opposed to modern random-access memory, delay-line memory was sequential-access
Delay-line_memory
Type of computer memory
rate synchronous dynamic random-access memory (DDR SDRAM) is a type of synchronous dynamic random-access memory (SDRAM) widely used in computers and other
DDR_SDRAM
Computing technique employed to achieve parallelism
maintains its memory coherence. From a programmer's point of view, this memory model is better understood than the distributed memory model. Another
Multiple instruction, multiple data
Multiple_instruction,_multiple_data
Type of computer memory
Magnetoresistive random-access memory (MRAM) is a type of non-volatile random-access memory which stores data in magnetic domains. Developed in the mid-1980s
Magnetoresistive_RAM
Novel computer memory type
Racetrack memory or domain-wall memory (DWM) is an experimental non-volatile memory device under development at IBM's Almaden Research Center by a team
Racetrack_memory
Computer memory used for small quantities of data
or E2PROM (electrically erasable programmable read-only memory) is a type of non-volatile memory. It is used in computers, usually integrated in microcontrollers
EEPROM
Computer storage device with no moving parts
driven storage medium. SSDs rely on non-volatile memory, typically NAND flash, to store data in memory cells. The performance and endurance of SSDs vary
Solid-state_drive
Flat, usually circular disc that encodes binary data
File operations of traditional mass storage devices such as flash drives, memory cards and hard drives can be simulated using a UDF live file system. For
Optical_disc
System of psychotherapy
Coherence therapy is a system of psychotherapy based in the theory that symptoms of mood, thought and behavior are produced coherently according to the
Coherence_therapy
Oracle Coherence (originally Tangosol Coherence) is a Java-based distributed cache and in-memory data grid developed by Oracle Corporation. It is claimed
Oracle_Coherence
Programming paradigm in which many processes are executed simultaneously
large, high-performance cache coherence systems is a very difficult problem in computer architecture. As a result, shared memory computer architectures do
Parallel_computing
Ability to recall an image from memory after one viewing
Eidetic memory (/aɪˈdɛtɪk/ eye-DET-ik), also known as photographic memory and total recall, is the ability to recall an image from memory with high precision—at
Eidetic_memory
Recording of information in a storage medium
optical disc drives, memory cards, and solid-state drives (SSDs). It also includes experimental forms like holographic memory. Mass storage includes
Data_storage
Write once computer memory
A programmable read-only memory (PROM) is a form of digital memory where the contents are set after the device is manufactured. Once set, the contents
Programmable_ROM
Electro-mechanical data storage device
produced in large volume, like mobile phones and tablets, rely on flash memory storage devices. More than 224 companies have produced HDDs historically
Hard_disk_drive
Message-passing system for parallel computers
discussion came a Workshop on Standards for Message Passing in a Distributed Memory Environment, held on April 29–30, 1992 in Williamsburg, Virginia. Attendees
Message_Passing_Interface
High-speed interconnect standard for shared memory multiprocessing and message passing
standard for shared memory multiprocessing and message passing. The goal was to scale well, provide system-wide memory coherence and a simple interface;
Scalable_Coherent_Interface
Magnetic data storage device
1960s as computer memory. Many early computers, called drum computers or drum machines, used drum memory as the main working memory of the computer. Some
Drum_memory
Novel type of computer memory
Ferroelectric RAM (FeRAM, F-RAM or FRAM) is a random-access memory similar in construction to DRAM but using a ferroelectric layer instead of a dielectric
Ferroelectric_RAM
Rules that guarantee predictable computer memory operation
Cache coherence – Equivalence of all cached copies of a memory location Distributed shared memory – Computer memory architecture Non-uniform memory access –
Consistency_model
Part of computer memory
The memory cell is the fundamental building block of computer memory. The memory cell is a device, such as an electronic circuit, that stores one bit of
Memory_cell_(computing)
GPU microarchitecture designed by Nvidia
CPU and GPU are connected via NVLink, which provides memory coherence between CPU and GPU memory. In November 2019, a well-known Twitter account posted
Hopper_(microarchitecture)
Discontinued computer memory type
XPoint (pronounced three-D cross point) is a discontinued non-volatile memory (NVM) technology developed jointly by Intel and Micron Technology. It was
3D_XPoint
comparison with non-autistic people. Weak central coherence can be used to explain what is viewed as a working memory deficit in attention or inhibition, as autistic
Autism_and_memory
Type of computer memory
type of synchronous dynamic random-access memory (SDRAM) designed to use less power than conventional memory. It is commonly used in smartphones, tablet
LPDDR
Psychological disorder
Fragmentation of memory is a type of memory disruption pertaining to the flaws or irregularities in sequences of memories, "coherence, and content" in
Fragmentation_of_memory
Operating system designed to operate on multiple systems over a network computer
synchronization on shared-memory multiprocessors Measurements of a distributed file system Memory coherence in shared virtual memory systems Transactions
Distributed_operating_system
Memory card format
MultiMediaCard (MMC) is a memory card standard used for solid-state storage, originally introduced in 1997 by SanDisk, Siemens, and Nokia. Designed as
MultiMediaCard
Process of encoding and decoding binary data to and from synthesized strands of DNA
published. N. Wiener expressed ideas about miniaturization of computer memory, close to the ideas, proposed by M. S. Neiman independently. These Wiener's
DNA_digital_data_storage
Set of computers configured in a distributed computing system
world's fastest machine in 2011 was the K computer which has a distributed memory, cluster architecture. Greg Pfister has stated that clusters were not invented
Computer_cluster
specifically: Write-Through Access (W), Cache-Inhibited Access (I), Memory Coherence (M), and Guarded (G). When set to 1, indicates a Write-Through Access
WIMG_(computing)
Theory on autism
The weak central coherence theory (WCC), also called the central coherence theory (CC), suggests that a specific perceptual-cognitive style, loosely described
Weak_central_coherence_theory
Replaceable device used for the distribution and storage of video games
exposed by the port and attached via an edge connector; the cartridge was memory mapped directly into the system's address space such that the CPU could
ROM_cartridge
Type of concurrency control mechanism
the underlying cache coherence protocol. Traditionally, buffers have been implemented using different structures within the memory hierarchy such as store
Transactional_memory
Early form of computer memory
inventors Freddie Williams and Tom Kilburn, is an early form of computer memory. It was the first random-access digital storage device, and was used successfully
Williams_tube
Novel type of computer memory
Millipede memory is a form of non-volatile computer memory. It promised a data density of more than 1 terabit per square inch (1 gigabit per square millimeter)
Millipede_memory
Computer memory organization
some other data, which doesn't have a home to go to). Hardware memory coherence mechanisms are typically used to implement the migration. A huge body
Cache-only memory architecture
Cache-only_memory_architecture
Removable disk storage medium
data storage capacity and data transfer speed, such as USB flash drives, memory cards, optical discs, and storage available through local computer networks
Floppy_disk
Quantum-mechanical version of computer memory
of qubits is limited by the internal coherence time of the physical qubits holding the information. "Quantum memory" beyond the given physical qubit storage
Quantum_memory
Nonlinear two-terminal fundamental circuit element
A memristor (/ˈmɛmrɪstər/; a portmanteau of memory resistor) is a non-linear two-terminal electrical component relating electric charge and magnetic flux
Memristor
Novel type of computer memory
Resistive random-access memory (ReRAM or RRAM) is a type of non-volatile (NV) random-access (RAM) computer memory that works by changing the resistance
Resistive random-access memory
Resistive_random-access_memory
Type of computer memory
random-access memory (NVRAM) is random-access memory that retains data without applied power. This is in contrast to dynamic random-access memory (DRAM) and
Non-volatile random-access memory
Non-volatile_random-access_memory
Data recording made of plastic film
cartridges and cassettes Pogue, David (1 September 2016). "Digitize Those Memory-Filled Cassettes before They Disintegrate". Scientific American. Archived
Magnetic_tape
Magnetic tape data storage technology
cartridge of the same generation with the following exceptions: the cartridge memory identifies it to the drive as WORM, the servo tracks are slightly different
Linear_Tape-Open
2-D grid of wires where data is represented by the presence or absence of diodes at nodes
instructions. A diode matrix is one technique for implementing a read-only memory. It may be used as the control store or microprogram in many early computers
Diode_matrix
Method to store and retrieve computer data using optics
such as floppy disks and hard disks, or semiconductors, such as flash memory. Optical storage in the form of discs grants the ability to record onto
Optical_storage
Proposed form of computer storage
Universal memory refers to a computer data storage device combining the cost benefits of DRAM, the speed of SRAM, the non-volatility of flash memory along
Universal_memory
Computer memory that can be accessed by multiple processes
In computer science, shared memory is memory that may be simultaneously accessed by multiple programs with an intent to provide communication among them
Shared_memory
Use of paper as computer memory
Computer memory and data storage types General Memory cell Memory coherence Cache coherence Memory hierarchy Memory access pattern Memory map Secondary
Paper_data_storage
Early type of solid state computer memory
read-only memory, is a type of programmable read-only memory (PROM) chip that retains its data when its power supply is switched off. Computer memory that
EPROM
Computer memory design used in multiprocessing
non-shared memory known as cache to exploit locality of reference in memory accesses. With NUMA, maintaining cache coherence across shared memory has a significant
Non-uniform_memory_access
Category of memory stabilizing processes
conditions and thus remains an area of ongoing debate. Atkinson–Shiffrin memory model Coherence therapy Engram Patient HM Sharp wave–ripple complexes Dudai, Y.
Memory_consolidation
Type of memory used on graphics cards
Graphics DDR SDRAM (GDDR SDRAM) is a type of synchronous dynamic random-access memory (SDRAM) specifically designed for applications requiring high bandwidth
GDDR_SDRAM
Type of random-access memory
Dual-ported RAM (DPRAM), also called dual-port RAM, is a type of random-access memory (RAM) that can be accessed via two different buses. A simple dual-port RAM
Dual-ported_RAM
Non-volatile memory technology
non-volatile computer memory developed at Arizona State University. PMC, a technology developed to replace the widely used flash memory, providing a combination
Programmable metallization cell
Programmable_metallization_cell
Cache coherence protocol for computer processors
The MESI protocol is an invalidate-based cache coherence protocol, and is one of the most common protocols that support write-back caches. It is also
MESI_protocol
Early type of computer memory
Mellon optical memory was an early form of computer memory invented at the Mellon Institute (today part of Carnegie Mellon University) in 1951. The device
Mellon_optical_memory
Data storage technologies that use magnetic tape
can be stopped, backed up, and restarted (known as shoe-shining). A large memory buffer can be used to queue the data. In the past, the host block size affected
Magnetic-tape_data_storage
psychology, thematic coherence is an organization of a set of meanings in and through an event. In education, for example, the thematic coherence happens when
Thematic_coherence
Early high speed computer memory
Thin-film memory is a high-speed alternative to magnetic-core memory developed by Sperry Rand in a government-funded research project. Instead of threading
Thin-film_memory
Dynamic random-access memory included in a processor chip or package
Embedded DRAM (eDRAM) is dynamic random-access memory (DRAM) integrated on the same die or multi-chip module (MCM) of an application-specific integrated
EDRAM
Access WIMG—Write-Through Access (W), Cache-Inhibited Access (I), Memory Coherence (M), and Guarded (G) WIMP—"windows, icons, menus, pointer" WinFS—Windows
List of computing and IT abbreviations
List_of_computing_and_IT_abbreviations
Types of accurate and detailed recall
Exceptional memory is the ability to have accurate and detailed recall in a variety of ways, including hyperthymesia, eidetic memory, synesthesia, and
Exceptional_memory
Variant of magnetic-core computer memory
Plated-wire memory is a variation of magnetic-core memory developed by Bell Laboratories in 1957. Its primary advantage was that it could be assembled
Plated-wire_memory
Computer network with multiple nodes to store information
Computer memory and data storage types General Memory cell Memory coherence Cache coherence Memory hierarchy Memory access pattern Memory map Secondary
Distributed_data_store
Persistent computer data storage with no moving parts
unit of storage. SSS devices typically use flash memory, but some use battery-backed random-access memory (RAM). Devices come in various types, form factors
Solid-state_storage
IBM data storage technology that uses PCI Express and NVMe
address space, without performance impact. On September 17, 2007, Texas Memory Systems (TMS) announced the RamSan-500, the world's first enterprise-class
Flash_Core_Module
Early and obsolete type of computer memory
The Selectron was an early form of digital computer memory developed by Jan A. Rajchman and his group at the Radio Corporation of America (RCA) under the
Selectron_tube
Data storage device
There are two main "hybrid" storage technologies that combine NAND flash memory or SSDs with the HDD technology: dual-drive hybrid systems and solid-state
Hybrid_drive
Family of 64-bit Intel microprocessors
cache coherence through in-memory directories, which causes the minimum memory latency to be 241 ns. The latency to the most remote (NUMA) memory is 463
Itanium
Computer science term
distributed cache much like Oracle Coherence GigaSpaces XAP is a Java based in-memory computing software platform like Oracle Coherence and VMware Gemfire In this
Memory_virtualization
Supercomputer at the University of Illinois Urbana-Champaign, United States
sustained speeds of at least one petaFLOPS. It had more than 1.5 PB of memory, more than 25 PB of disk storage, and up to 500 PB of tape storage. The
Blue_Waters
Network packet distribution with multiple cores
the latencies introduced by the retrieval of the data from the central memory. To do this, after having computed the hash of the header fields for the
Multi-core network packet steering
Multi-core_network_packet_steering
Pseudo-static random-access memory technology introduced by MoSys Inc.
random-access memory (SRAM) in embedded memory applications. Mosys uses a single-transistor storage cell (bit cell) like dynamic random-access memory (DRAM)
1T-SRAM
MEMORY COHERENCE
MEMORY COHERENCE
Female
English
English name derived from the vocabulary word, MELODY means "melody."
Girl/Female
Assamese, Bengali, Hindu, Indian, Kannada, Malayalam, Marathi, Telugu
Memory
Girl/Female
Muslim
Memory
Boy/Male
Assamese, Indian
Memory
Girl/Female
Indian
Memory
Girl/Female
Tamil
Memory
Boy/Male
Australian, Farsi
Memory
Male
Japanese
(守) Japanese name MAMORU means "protector."
Male
Polish
Polish form of Greek Methodios, METODY means "method."
Girl/Female
Gujarati, Hindu, Indian
Memory
Girl/Female
English American Greek
Melody.
Girl/Female
Indian
Memory
Girl/Female
English American Welsh
Merry; mirthful; joyous. Also an abbreviation of Meredith.
Girl/Female
Tamil
Memory
Surname or Lastname
English
English : variant of Embury or Emery.
Male
English
Variant spelling of English Emery, EMORY means "work-power."
Girl/Female
Indian, Sanskrit
Memory
Girl/Female
Afghan, Arabic, Muslim
Memory
Surname or Lastname
English
English : variant spelling of Emery.
Girl/Female
Arabic, Gujarati, Indian, Muslim, Parsi
Memory
MEMORY COHERENCE
MEMORY COHERENCE
Boy/Male
Tamil
Ugrasena | உகà¯à®°à®¸à¯‡à®¨à®¾
One of the kauravas
Girl/Female
Indian
Blessing
Boy/Male
American, Chinese, French, German, Latin, Portuguese
Guards Wisely; Protecting Hands; Wise Protector
Girl/Female
Hindu, Indian, Kannada, Malayalam, Marathi, Sanskrit, Telugu
Existence
Boy/Male
Indian, Sanskrit
Consciousness; Awakening
Boy/Male
Arabic, French, German, Teutonic
House; Fearless
Surname or Lastname
English and Scottish
English and Scottish : habitational name from any of various places, as far apart as Essex, Wiltshire, Cornwall, Northamptonshire, Cheshire, and Roxburghshire, named with Old English wudu ‘wood’ + ford ‘ford’.Thomas Woodford emigrated from Lincolnshire, England, to NY in 1690.
Boy/Male
Christian & English(British/American/Australian)
Constant, Firm, Strong
Boy/Male
American, Australian, British, Danish, English, German, Indian, Latin, Tamil
Power; Strong; Healthy
Female
Hebrew
Variant form of Hebrew Cheftzi-Ba, CHEFTZIBAH means "she is my desire."
MEMORY COHERENCE
MEMORY COHERENCE
MEMORY COHERENCE
MEMORY COHERENCE
MEMORY COHERENCE
a.
Assisting in memory.
superl.
Causing laughter, mirth, gladness, or delight; as, / merry jest.
n.
A memorial account; a history composed from personal experience and memory; an account of transactions or events (usually written in familiar style) as they are remembered by the writer. See History, 2.
n.
Memory; remembrance.
n.
The art of memory; a system of precepts and rules intended to assist the memory; artificial memory.
n.
Memory.
n.
Alt. of Memoirs
n.
Something, or an aggregate of things, remembered; hence, character, conduct, etc., as preserved in remembrance, history, or tradition; posthumous fame; as, the war became only a memory.
a.
Mnemonic; assisting the memory.
n.
The actual and distinct retention and recognition of past ideas in the mind; remembrance; as, in memory of youth; memories of foreign lands.
a.
Causing loss of memory.
n.
A memorial.
adv.
Beyond memory.
pl.
of Memory
n.
The time within which past events can be or are remembered; as, within the memory of man.
n.
The faculty of the mind by which it retains the knowledge of previous thoughts, impressions, or events.
adv.
By, or from, memory.
n.
The reach and positiveness with which a person can remember; the strength and trustworthiness of one's power to reach and represent or to recall the past; as, his memory was never wrong.
n.
Recital from memory; rehearsal.
n.
Any one of several species of fishes belonging to Echeneis, Remora, and allied genera. Called also sucking fish.