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Mechanism for capturing chronological and causal relationships
A logical clock is a mechanism for capturing chronological and causal relationships in a distributed system. Often, distributed systems may have no physically
Logical_clock
Algorithm used to determine the order of events in a distributed computer system
The Lamport timestamp algorithm is a simple logical clock algorithm used to determine the order of events in a distributed computer system. As different
Lamport_timestamp
Algorithm for partial ordering of events and detecting causality in distributed systems
process's logical clock. A vector clock of a system of n processes is a vector (equivalentlly, a 1-dimensional array) of n logical clocks, one clock per process
Vector_clock
Software language
provides a concrete syntax to handle logical clocks. The term logical clock refers to Leslie Lamport's logical clocks and its usage in CCSL is directly inspired
Clock Constraints Specification Language
Clock_Constraints_Specification_Language
Mechanism for tracking data changes
With Dotted Version Vectors. ACM PODC, pp. 335-336, 2012. Why Logical Clocks are Easy (Compares Causal Histories, Vector Clocks and Version Vectors)
Version_vector
A matrix clock is a mechanism for capturing chronological and causal relationships in a distributed system. Matrix clocks are a generalization of the notion
Matrix_clock
Relation between two events in computer science
the happened-before relation unless they use a logical clock, like a Lamport clock or a vector clock. This allows one to design algorithms for mutual
Happened-before
Coordination of independent clocks
Protocol (UDP) message passing. Lamport timestamps and vector clocks are concepts of the logical clock in distributed computing. In a wireless network, the problem
Clock_synchronization
Electronic circuit with two stable states
as the input logical zero (of the output stage) remains active while the clock is high. Any change of the data input while the clock is high will not
Flip-flop_(electronics)
American computer scientist and mathematician (born 1941)
"The Part-Time Parliament". These papers relate to such concepts as logical clocks (and the happened-before relationship) and Byzantine failures. They
Leslie_Lamport
Transactional distributed SQL database
The engine also exploits a Hybrid Logical Clock that combines coarsely-synchronized physical clocks with Lamport clocks to track causal relationships. The
YugabyteDB
Model in software programming
Why Logical Clocks Are Easy. Comm. ACM 59(4), pp. 43–47, April 2016. Charron-Bost, Bernadette (July 1991), "Concerning the size of logical clocks in distributed
Causal_consistency
distributed systems (e.g. the bakery algorithm). Developed the concept of a logical clock, enabling synchronization between distributed entities based on the
List of pioneers in computer science
List_of_pioneers_in_computer_science
Algorithm for mutual exclusion on a distributed system
site's name, and the current timestamp of the system according to its logical clock (which is assumed to be synchronized with the other sites) Receiving
Ricart–Agrawala_algorithm
Free and open-source database management system
timestamps (node bootstrap time) Version numbers (logical clock values) The system uses vector clocks to track information currency and ignore outdated
Apache_Cassandra
Metric for a quantum computer's capabilities
reliable operations a computer can execute in a single second: logical error rates, clock speed, and number of reliable qubits. The quantities included
RQOPS
site. ts refers to the local time stamp of the system according to its logical clock Requesting site: A requesting site P i {\displaystyle P_{i}} sends a
Maekawa's_algorithm
American annual computer science prize
January 16, 2016. Retrieved March 18, 2014. Lamport, L. (1978). "Time, clocks, and the ordering of events in a distributed system" (PDF). Communications
Turing_Award
Computer science topic
bitwise NOT, or bitwise complement, is a unary operation that performs logical negation on each bit, forming the ones' complement of the given binary
Bitwise_operation
exclusion algorithm and its related version, this algorithm does not use logical clocks. This method requires only O(log(number of processes in the network))
Naimi–Trehel_algorithm
Digital circuit synchronized by clock signal
the next clock occurs, so the behaviour of the whole circuit can be predicted exactly. Practically, some delay is required for each logical operation
Synchronous_circuit
System with multiple networked computers
synchronous algorithms in asynchronous systems. Logical clocks provide a causal happened-before ordering of events. Clock synchronization algorithms provide globally
Distributed_computing
Telecommunications coding technique
for bit synchronization when a separate clock signal is not available. Since NRZ is not inherently a self-clocking signal, some additional synchronization
Non-return-to-zero
Device performing a Boolean function
A logic gate is a device that performs a Boolean function, a logical operation performed on one or more binary inputs that produces a single binary output
Logic_gate
Combinational digital circuit
next clock, are allowed to propagate through the ALU and to the destination register while the CPU waits for the next clock. When the next clock arrives
Arithmetic_logic_unit
Average number of instructions executed for each clock cycle
called instructions per clock, is one aspect of a processor's performance: the average number of instructions executed for each clock cycle. It is the multiplicative
Instructions_per_cycle
Line code
These have the property that either Data or Strobe changes its logical value in one clock cycle, but never both. More precisely data is transmitted as-is
Data_strobe_encoding
Central computer component that executes instructions
of these early synchronous CPUs ran at low clock rates compared to modern microelectronic designs. Clock signal frequencies ranging from 100 kHz to 4 MHz
Central_processing_unit
1943 paper proposing artificial neural networks
"A Logical Calculus of the Ideas Immanent in Nervous Activity" is a 1943 paper written by Warren Sturgis McCulloch and Walter Pitts, published in the
A Logical Calculus of the Ideas Immanent in Nervous Activity
A_Logical_Calculus_of_the_Ideas_Immanent_in_Nervous_Activity
American computer company
IBM PC, called the Logical L-XT, which featured a 10-MB hard drive, 320-KB floppy drive and 192 KB of RAM, and a real-time clock, and came shipped with
Logical_Machine_Corporation
Server partitioning hardware and software
Logical Domains (LDoms or LDOM) is the server virtualization and partitioning technology for sun4v processors. It was first released by Sun Microsystems
Oracle_VM_Server_for_SPARC
of the CS Request messages sent to all nodes Not based on Lamport’s logical clock The algorithm uses sequence numbers instead Used to keep track of outdated
Suzuki–Kasami_algorithm
requirements in a clocked synchronous circuit. The goal is to guarantee correct data transfer and reliable operation at the target clock frequency. A synchronous
Timing_closure
Family of operating systems for IBM PC compatibles
logical drives in extended partitions; the new drive will be assigned a letter that was previously assigned to one of the extended partition logical drives
DOS
Thought experiment in special relativity
Therefore, the twin paradox is not actually a paradox in the sense of a logical contradiction. Starting with Paul Langevin in 1911, there have been various
Twin_paradox
Standard for serial communication between devices without host computer
namely without a clock signal. The CAN specifications use the terms dominant bits and recessive bits, where dominant is a logical 0 (actively driven
CAN_bus
Successor to the Intel 386
rating of 27.9. It is approximately twice as fast as the i386 or i286 per clock cycle. The i486's improved performance is thanks to its five-stage pipeline
I486
Buffer in digital electronics
has three stable states: a high voltage output state (logical 1), a low output state (logical 0), and a high-impedance (Hi-Z) state. In the Hi-Z state
Three-state_logic
Type of logic circuit
maximum possible clock rate is determined by the slowest logic path in the circuit, otherwise known as the critical path. Every logical calculation, from
Sequential_logic
remains the same, before and after the clock pulse. This leads to unnecessary dissipation of power due to clock transition. If flip-flops are designed
Low_power_flip-flop
X86 microprocessor
characteristics and clock speeds. Some of which were only sold in limited quantities. All models feature an 8 KB level 1 cache and operate at clock speeds of 25 MHz
UMC_Green_CPU
Array of logic gates that are reprogrammable
used for clock generation and management as well as for high-speed serializer and deserializer (SERDES) transmit clocks and receiver clock recovery.
Field-programmable_gate_array
case of a combinatorial auction is the combinatorial clock auction (CCA), which combines a clock auction, during which bidders may provide their confirmations
Combinatorial_auction
Film by Christian Ditter
of his older sister Emma, who provides a logical perspective. He lets her know the secret truth of the clock, revealing he has already reset this day
The_Present_(2024_film)
Digital electronic term
CMOS for many years. Often a single signal (as an extreme example, the clock signal) needs to drive far more than 10 things on a chip. Rather than simply
Fan-out
Digital circuit optimisation
topology have consequences in other logical and physical synthesis steps that make design closure difficult. Clock skew scheduling is a related technique
Retiming
Computer architecture for educational purposes
example in Digital Computer Electronics for building and analyzing complex logical systems with digital electronics. Digital Computer Electronics successively
Simple-As-Possible_computer
Psychological defense mechanism
developed a model, called the Amoralizations Alarm Clock, that covers all existing amoralizations in a logical way. Amoralizations, also called neutralizations
Rationalization_(psychology)
Computation modulo a fixed integer
familiar setting exhibiting modular arithmetic is the hour hand on a 12-hour clock. If the hour hand points to 7 now, then 8 hours later it will point to 3
Modular_arithmetic
Standard for computer data connections
a compound device, in which the host assigns each logical device a distinct address and all logical devices connect to a built-in hub that connects to
USB
Time delay between data read command and availability of data in a computer's RAM
if the clock rate differs. Dynamic RAM is arranged in a rectangular array. Each row is selected by a horizontal word line. Sending a logical high signal
CAS_latency
Synchronous serial communication interface
the clock. Polarities can be converted with a simple inverter. SCLKCPOL=0 is a clock which idles at the logical low voltage. SCLKCPOL=1 is a clock which
Serial_Peripheral_Interface
ARM- and RISC-V-architecture microcontroller by the Raspberry Pi Foundation
inputs to source about 120 μA when the input voltage is between logical low and logical high, pulling them to about 2.2V. Luke Wren, one of the engineers
RP2350
Measure of time used in digital CMOS technologies
design with cycle delay of 13 FO4; clock period of Intel's Pentium 4 at 3.4 GHz is estimated as 16.3 FO4. Logical effort Fan-in Horowitz, Mark; Harris
FO4
Concept in computer science
are of particular interest for this purpose: physical reversibility and logical reversibility. A process is said to be physically reversible if it results
Reversible_computing
powers. Donna starts to believe she has ESP. Alex says there are probably logical explanations. But when Donna hints that Alex should invest in the oil company
List of The Donna Reed Show episodes
List_of_The_Donna_Reed_Show_episodes
Two interrelated physics theories by Albert Einstein
relative motion. Time dilation: Moving clocks are measured to tick more slowly than an observer's "stationary" clock. Length contraction: Objects are measured
Theory_of_relativity
Set of computer and peripheral connection standards
The SCSI standards define commands, protocols, electrical, optical and logical interfaces. The SCSI standard defines command sets for specific peripheral
SCSI
Flash memory card format
(or logical high). SD cards and host devices initially communicate through a synchronous one-bit interface, where the host device provides a clock signal
SD_card
Subset of computer security
Logical security consists of software safeguards for an organization's systems, including user identification and password access, authenticating, access
Logical_security
element which may be used in a logical formula and which may take a number of different values. A clock valuation or clock interpretation ν {\displaystyle
Clock_(model_checking)
Digital circuit found in computers
the vacated bits of the output word and thus perform a logical shift operation (e.g., logical shift left), or it may rotate all bits of the input word
Barrel_shifter
Hypothetical travel into the past or future
traveler visits the past is limited to what did happen, in order to prevent logical contradictions. The Novikov self-consistency principle, named after Igor
Time_travel
Mathematical model combining space and time
whole ensemble of clocks associated with one inertial frame of reference. In this idealized case, every point in space has a clock associated with it
Spacetime
1995 edition of the Fortran programming language standard
There are only two basic values of logical constants: .TRUE. and .FALSE.. Here, there may also be different kinds. Logicals don't have their own kind inquiry
Fortran_95_language_features
Comic book antihero
well as his black-and-white morality. Moore came to view Rorschach as a logical extension of both Mr. A and the Question. On the other hand, upon being
Rorschach_(character)
Digital circuit design abstraction
edges of the clock signal, and are the only elements in the circuit that have memory properties. Combinational logic performs all the logical functions in
Register-transfer_level
Step in the design cycle of devices
primarily by minimizing skew while controlling insertion delay. The clock is a single logical signal of high fanout before CTS, as shown in the picture. After
Physical_design_(electronics)
128-bit number used to identify information in computer systems
performance. With version 7 as database keys, "new" records are inserted at the logical end of the key sequence, and records which are close in time are near each
Universally_unique_identifier
Graphical method to simplify Boolean expressions
Veitch chart, which itself was a rediscovery of Allan Marquand's 1881 logical diagram or Marquand diagram. They are also known as Marquand–Veitch diagrams
Karnaugh_map
Self-synchronizing line code
encoding (DM) is a line code in digital frequency modulation in which data and clock signals are combined to form a single two-level self-synchronizing data
Differential Manchester encoding
Differential_Manchester_encoding
Standard for serial communication
RS-232 standard defines the voltage levels that correspond to logical one and logical zero levels for the data transmission and the control signal lines
RS-232
Type of computer memory
the rising and falling edges of the clock signal, effectively doubling the data rate without increasing the clock frequency. This technique, known as
DDR_SDRAM
Serial communication bus
I2C applications include reading hardware monitors, sensors, real-time clocks, controlling actuators, accessing low-speed DACs and ADCs, controlling simple
I2C
Logic formula
three" or propositional variables such as p and q, using connectives or logical operators such as NOT, AND, OR, or IMPLIES; for example: (p AND NOT q)
Propositional_formula
Serial communication with clock signal
peripheral) provided two clock signals to the DTE (generally the host computer or terminal), transmitter clock (pin 15, TCK) and receiver clock (pin 17, RCK). Some
Synchronous serial communication
Synchronous_serial_communication
Philosophical concept
enquiry. They are a logical consequence of lower-level facts about the world, similar to how a clock's ability to tell time is a logical consequence of its
Hard_problem_of_consciousness
AI model that developer a super-human sorting algorithm
stochastic superoptimization, a logical AI approach. The latter was run with at least the same amount of resources and wall-clock time as AlphaDev. The results
AlphaDev
with the Golder State Killer April 27, 2026 (2026-04-27) 529 "How About Logical?" Gilgo Beach murders The Great Diamond Hoax April 23, 2026 (2026-04-23)
List of My Favorite Murder episodes
List_of_My_Favorite_Murder_episodes
Punctuation to signal the end of a sentence (.)
border of logical operations to potentially prevent ambiguities; e.g., in ⊢: P∈Ω. E!B̌P. ⊃. P∈Ded., full stops are used to separate logical statements
Full_stop
Type of computer memory
The masked clock is the logical AND of the input clock and the state of the CKE signal during the previous rising edge of the input clock. CS chip select
Synchronous dynamic random-access memory
Synchronous_dynamic_random-access_memory
Awareness of facts
Other examples are ethical, religious, scientific, mathematical, and logical knowledge as well as self-knowledge. A further distinction focuses on the
Declarative_knowledge
Computer expansion bus standard
Express peripheral is bidirectional. PCI Express devices communicate via a logical connection called an interconnect or link. A link is a point-to-point communication
PCI_Express
Bit-vector representation where only one bit can be set at a time
Unary numeral system – Base-1 numeral system Uniqueness quantification – Logical quantifier XOR gate – Logic gate Harris, David and Harris, Sarah (2012-08-07)
One-hot
War actions of the German military officer
Maurice Remy adds that Rommel's controversial stance on Malta was the only a logical strategic choice. Rommel was among the few Axis commanders (the others
Erwin Rommel in the Second World War
Erwin_Rommel_in_the_Second_World_War
Electronic circuits that utilize digital signals
between binary inputs and outputs by passing electrical signals through logical gates, resistors, capacitors, amplifiers, and other electronic components
Digital_electronics
2004 family of multiprocessors by IBM
supporting one physical thread and two logical threads, for a total of two physical threads and four logical threads. Technical details of the microprocessor
POWER5
Turret clock in Cornwall, England
The Cotehele clock is situated at Cotehele House, Calstock, Cornwall. It is the earliest turret clock in the United Kingdom still working in an unaltered
Cotehele_clock
a total staff of 118, organised in three shifts working round the clock. The logical structure of the Tunny system was worked out by mathematician Bill
Testery
Programming paradigm in which many processes are executed simultaneously
time per instruction. Maintaining everything else constant, increasing the clock frequency decreases the average time it takes to execute an instruction
Parallel_computing
Practice of setting the clock forward by one hour in the United states
States observes daylight saving time (DST), the practice of setting the clock forward by one hour when there is longer daylight during the day, so that
Daylight saving time in the United States
Daylight_saving_time_in_the_United_States
Set of rules describing computer system
First Draft of a Report on the EDVAC, which described an organization of logical elements; and Alan Turing's more detailed Proposed Electronic Calculator
Computer_architecture
Type of computer memory
rate, and the quarter-speed master clock, results in a master clock which is half the frequency of a similar LPDDR4 clock. The command (CA) bus is widened
LPDDR
American animated television series
Tino Tonitini (voiced by Jason Marsden) is the perceptive, astute, and logical-minded leader of the central group of friends. He serves as the heart of
The_Weekenders
PIO column positions to a logical pin. RUNTEST: Forces the IEEE 1149.1 bus to a run state for a specified number of clocks or a specified time period
Serial_Vector_Format
is a linear-time logic that assumes both the interleaving and fictitious-clock abstractions. It is defined over a point-based weakly monotonic integer-time
Metric_temporal_logic
2007 video game
is similar to the colored peg game Mastermind, where success requires logical reasoning (although there is a small chance of succeeding through lucky
Purble_Place
Austrian–British philosopher of science (1902–1994)
in 1934. Here, he criticised psychologism, naturalism, inductivism, and logical positivism, and put forth his theory of potential falsifiability as the
Karl_Popper
Call by an official to announce a disallowed goal
that a goal has not been legally scored. While such a call can be the logical result of the ball or puck never entering the goal during a goal-scoring
No_goal
Dutch mathematician and physicist (1629–1695)
inventor, he improved the design of telescopes and invented the pendulum clock, the most accurate timekeeper for almost 300 years. A talented mathematician
Christiaan_Huygens
LOGICAL CLOCK
LOGICAL CLOCK
Boy/Male
Hindu
Love and kindness, Analytical, Logical
Girl/Female
Australian, French, Swedish
Elf; Magical Counsel
Boy/Male
German, Swedish
Elf; Magical Army; Warrior
Girl/Female
Danish, Hindu, Indian, Japanese
Ray of Light; Logical
Girl/Female
African, Arabic, French, Indian, Muslim, Swahili, Tamil
Intelligent; Logical; Intelligent One who Reasons; Wise
Boy/Male
Tamil
Intelligent, Logical
Boy/Male
Indian
Intelligent, Logical
Girl/Female
Hindu
Girl/Female
Indian
Successful; Logical Thinkers
Boy/Male
Indian, Sanskrit
Logician
Girl/Female
Native American
Magical dancer.
Boy/Male
Tamil
Love and kindness, Analytical, Logical
Boy/Male
Gujarati, Hindu, Indian, Sanskrit
Logical Science
Boy/Male
Hindu, Indian
Logical
Girl/Female
Tamil
Give light to others
Boy/Male
Indian, Sanskrit
Endowed with Mind; Logical
Girl/Female
Indian, Modern, Sanskrit
Magical
Girl/Female
Hindu, Indian
Give Light to Others
Girl/Female
Indian, Tamil
King Rama's Wife
Boy/Male
Hindu, Indian
A Magical Sword
LOGICAL CLOCK
LOGICAL CLOCK
Boy/Male
Tamil
Agustya | அகà¯à®¸à¯à®¤à¯à®¯à®¾
A name of a Hindu saint
Boy/Male
English Scottish
French town.
Boy/Male
Sikh
Clean, Pure like God
Boy/Male
Gaelic
Dark hero.
Boy/Male
Hindu
(Brother of amavasuand Satayu)
Male
Italian
Italian form of Latin Amadeus, AMADEO means "to love God."
Girl/Female
Hungarian American English French German Spanish Latin
Intelligent.
Girl/Female
Indian
Merciful, Companionate, To have mercy upon
Boy/Male
Muslim/Islamic
Honorable Judge One who Jugdes Fairly
Girl/Female
Hindu, Indian
Musical Instrument
LOGICAL CLOCK
LOGICAL CLOCK
LOGICAL CLOCK
LOGICAL CLOCK
LOGICAL CLOCK
a.
Exciting mirth; droll; laughable; as, a comical story.
a.
Of or pertaining to logic; used in logic; as, logical subtilties.
a.
Skilled in logic; versed in the art of thinking and reasoning; as, he is a logical thinker.
a.
Half logical; partly logical; said of fallacies.
a.
Having the form of, or resembling, a geometrical cone; round and tapering to a point, or gradually lessening in circumference; as, a conic or conical figure; a conical vessel.
a.
Of or pertaining to the nodes; from a node to the same node again; as, the nodical revolutions of the moon.
a.
Excessively logical; adhering too closely to the forms or rules of logic.
a.
Having a mixture of seriousness and sport; serious and comical.
pl.
of Lorica
n.
Of or pertaining to a place; limited; logical application; as, a topical remedy; a topical claim or privilege.
n.
A person skilled in logic.
adv.
In a logical manner; as, to argue logically.
a.
According to the rules of logic; as, a logical argument or inference; the reasoning is logical.
a.
Logical.
n.
A logical deduction.
a.
Ignorant or negligent of the rules of logic or correct reasoning; as, an illogical disputant; contrary of the rules of logic or sound reasoning; as, an illogical inference.
a.
Having or observing logical sequence; logically consistent and rigorous; consecutive in development or transition of thought.
v. t.
Consistent; logical.
n.
See Logic.
n.
A treatise on logic; as, Mill's Logic.