Out-of-order execution and Parallel computing

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Difference between Out-of-order execution and Parallel computing

Out-of-order execution vs. Parallel computing

In computer engineering, out-of-order execution (or more formally dynamic execution) is a paradigm used in most high-performance central processing units to make use of instruction cycles that would otherwise be wasted. Parallel computing is a type of computation in which many calculations or the execution of processes are carried out concurrently.

Central processing unit

A central processing unit (CPU) is the electronic circuitry within a computer that carries out the instructions of a computer program by performing the basic arithmetic, logical, control and input/output (I/O) operations specified by the instructions.

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Computer architecture

In computer engineering, computer architecture is a set of rules and methods that describe the functionality, organization, and implementation of computer systems.

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Computer data storage

Computer data storage, often called storage or memory, is a technology consisting of computer components and recording media that are used to retain digital data.

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CPU cache

A CPU cache is a hardware cache used by the central processing unit (CPU) of a computer to reduce the average cost (time or energy) to access data from the main memory.

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Dataflow architecture

Dataflow architecture is a computer architecture that directly contrasts the traditional von Neumann architecture or control flow architecture.

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Execution unit

In computer engineering, an execution unit (also called a functional unit) is a part of the central processing unit (CPU) that performs the operations and calculations as instructed by the computer program.

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IBM

The International Business Machines Corporation (IBM) is an American multinational technology company headquartered in Armonk, New York, United States, with operations in over 170 countries.

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Instruction pipelining

Instruction pipelining is a technique for implementing instruction-level parallelism within a single processor.

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Instruction set architecture

An instruction set architecture (ISA) is an abstract model of a computer.

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Intel

Intel Corporation (stylized as intel) is an American multinational corporation and technology company headquartered in Santa Clara, California, in the Silicon Valley.

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Lockstep (computing)

Lockstep systems are fault-tolerant computer systems that run the same set of operations at the same time in parallel.

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Operating system

An operating system (OS) is system software that manages computer hardware and software resources and provides common services for computer programs.

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Pentium 4

Pentium 4 is a brand by Intel for an entire series of single-core CPUs for desktops, laptops and entry-level servers.

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Race condition

A race condition or race hazard is the behavior of an electronics, software, or other system where the output is dependent on the sequence or timing of other uncontrollable events.

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Register renaming

In computer architecture, register renaming is a technique that eliminates the false data dependencies arising from the reuse of architectural registers by successive instructions that do not have any real data dependencies between them.

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Scoreboarding

Scoreboarding is a centralized method, used in the CDC 6600 computer, for dynamically scheduling a pipeline so that the instructions can execute out of order when there are no conflicts and the hardware is available.

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Thread (computing)

In computer science, a thread of execution is the smallest sequence of programmed instructions that can be managed independently by a scheduler, which is typically a part of the operating system.

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Tomasulo algorithm

Tomasulo’s algorithm is a computer architecture hardware algorithm for dynamic scheduling of instructions that allows out-of-order execution and enables more efficient use of multiple execution units.

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Yale Patt

Yale Nance Patt is an American professor of electrical and computer engineering at The University of Texas at Austin.

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