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Concept
CAL Actor Language
Résumé
CAL (the Cal Actor Language) is a high-level programming language for writing (dataflow) actors, which are stateful operators that transform input streams of data objects (tokens) into output streams. CAL has been compiled to a variety of target platforms, including single-core processors, multicore processors, and programmable hardware. It has been used in several application areas, including video and processing, compression and cryptography. The MPEG Reconfigurable Video Coding (RVC) working group has adopted CAL as part of their standardization efforts.
The CAL Actor Language was developed in 2001 as part of the Ptolemy II project at University of California at Berkeley. CAL is a dataflow language geared towards a variety of application domains, such as multimedia processing, control systems, network processing etc.
Another common reason for choosing dataflow is that the goal is an efficient parallel implementation which would be difficult or impossible to achieve using a sequential programming language. Sequential languages are notoriously difficult to parallelize in general, so efficient parallel implementations will usually require significant guidance from the user. A CAL dataflow program provides simple, understandable, and powerful abstractions that allow the specification of as much or as little parallelism as is required, enabling tools to produce sophisticated implementations that exploit the concurrent structure of a computation.
When programming in dataflow, the programmer is typically constructing a concurrent description of a computational system, which is different from a common sequential program. Rather than being concerned with the step-by-step execution of an algorithm, a dataflow programmer builds a system of asynchronously communicating entities called actors. Much of the programming effort is directed toward finding a good factoring of the problem into actors, and toward engineering appropriate communication patterns among those actors.
Actors perform their computation in a sequence of steps called firings.
Source officielle
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