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{{Short description|Area of research}}
{{About| the definition of the term 'programming model'| classification of programming languages| Programming paradigm}}
{{More citations needed|date=January 2025}}
A '''programming model''' is an [[execution model]] coupled to an [[API]] or a particular pattern of code. In this style, there are actually two execution models in play: the execution model of the base [[programming language]] and the execution model of the programming model. An example is [[Apache_Spark|Spark]] where [[Java_language| Java]] is the base language, and Spark is the programming model. Execution may be based on what appear to be [[Programming library|library]] calls. Other examples include the [[POSIX Threads]] library and Hadoop's [[MapReduce]].<ref>{{cite web
| url = https://www.ibm.com/
| title = What is MapReduce
| author = IBM
| website = [[IBM]]
}}</ref> In both cases, the [[execution model]] is different from that of the base language in which the code is written. For example, the [[C programming language]] has no execution model for thread behavior. But thread behavior can be invoked from C syntax, by making, what appears to be, a call to a normal C library.▼
|access-date=2020-04-19
▲}}</ref>
What distinguishes a programming model from a normal library is that the behavior of the call cannot be understood in terms of the language the program is written in. For example, the behavior of calls to the POSIX thread library cannot be understood in terms of the C language. The reason is that the call invokes an execution model that is different from the execution model of the language. This invocation of an outside execution model is the defining characteristic of a programming ''model'', in contrast to a programming ''language''.
In [[parallel computing]], the execution model often must expose features of the hardware in order to achieve high performance. The large amount of variation in parallel hardware causes a concurrent need for a similarly large number of parallel execution models. It is impractical to make a new language for each execution model, hence it is a common practice to invoke the behaviors of the parallel execution model via an API. So, most of the programming effort is done via parallel programming models rather than parallel languages.
| url = http://compss.bsc.es/
| title = COMP Superscalar Programming Model
| author = Barcelona Supercomputing Center
}}</ref>
==References==
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