Explicit parallelism: Difference between revisions

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{{short description |Parallelism expressed within computations}}

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In [[computer programming]], '''explicit parallelism''' is the representation

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of concurrent computations by means of primitives

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in the form of special-purpose directives or function calls. Most parallel primitives are related to process synchronization, communication or task partitioning. As they seldom contribute to actually carry out the

In [[computer programming]], '''explicit parallelism''' is the representation of concurrent computations using primitives in the form of operators, function calls or special-purpose directives.<ref name="pra11" /> Most parallel primitives are related to process synchronization, communication and process partitioning.<ref name="dij68" /> As they rarely contribute to actually carry out the intended computation of the program but, rather, structure it, their computational cost is often considered as overhead.

intended computation of the program, their computational cost is often considered

as [[parallelization overhead]].

The advantage of explicit [[parallel programming]] is increased programmer control over the computation. A skilled parallel programmer may take advantage of explicit parallelism to produce efficient code for a given target computation environment. However, programming with explicit parallelism is often difficult, especially for non-computing specialists, because of the extra work and skill involved in developing it.

The advantage of explicit [[parallel programming]] is the absolute programmer

control over the parallel execution. A skilled

parallel programmer takes advantage of explicit parallelism to produce

very efficient code. However, programming with explicit parallelism is often difficult, especially for

non computing specialists, because of the extra work involved in planning

the task division and synchronization of concurrent processes.

In some instances, explicit parallelism may be avoided with the use of an optimizing compiler or runtime that automatically extractsdeduces the parallelism inherent to computations, known (seeas [[implicit parallelism]]).

==Programming withlanguages that support explicit parallelism==

Some of the programming languages that support explicit parallelism are:

*[[Occam (programming language)]]

*[[ErlangAda (programming language)|Ada]]

*[[Ease programming language|Ease]]

*[[Erlang (programming language)|Erlang]]

*[[Java (programming language)|Java]]

*[[JavaSpaces]]

*[[Message Passing Interface]]

*[[Occam (programming language)|Occam]]

*[[Parallel Virtual Machine]]

*[[Ease programming language]]

*[[Ada programming language]]

*[[Java (programming language)|Java programming language]]

*[[JavaSpaces]]

== References ==

{{Parallel Computing}}

{{reflist |refs=

<ref name="dij68">{{cite journal |title=The structure of the "THE"-multiprogramming system|date=1968-05-01 |first=Edsger W. |last=Dijkstra |author-link=Edsger W. Dijkstra |journal=Communications of the ACM |volume=11 |issue=5 |pages=341–346 |doi=10.1145/363095.363143 }}</ref>

<ref name="pra11">{{cite conference |title=Parallel programming: design of an overview class |date=June 2011 |first=Christoph |last=von Praun |conference=Proceedings of the 2011 ACM SIGPLAN X10 Workshop |number=2 |pages=1–6 |doi=10.1145/2212736.2212738 }}</ref>

}}

{{Parallel Computing}}

{{DEFAULTSORT:Explicit Parallelism}}

[[Category:ComputerParallel programmingcomputing]]

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