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Partitioned global address space

In computer science, partitioned global address space (PGAS) is a parallel programming model paradigm. PGAS is typified by communication operations involving a global memory address space abstraction that is logically partitioned, where a portion is local to each process, thread, or processing element. The novelty of PGAS is that the portions of the shared memory space may have an affinity for a particular process, thereby exploiting locality of reference in order to improve performance. A PGAS memory model is featured in various parallel programming languages and libraries, including: Coarray Fortran, Unified Parallel C, Split-C, Fortress, Chapel, X10, UPC++, Coarray C++, Global Arrays, DASH and SHMEM. The PGAS paradigm is now an integrated part of the Fortran language, as of Fortran 2008 which standardized coarrays.

Examples
• Coarray Fortran now an integrated part of the language as of Fortran 2008 • Unified Parallel C an explicitly parallel SPMD dialect of the ISO C programming language • Chapel a parallel language originally developed by Cray under the DARPA HPCS project • UPC++, A C++ template library that provides PGAS communication operations designed to support high-performance computing on exascale supercomputers, including Remote Memory Access (RMA) and Remote Procedure Call (RPC) • Coarray C++ a C++ library developed by Cray, providing a close analog to Fortran coarray functionality • Global Arrays a library supporting parallel scientific computing on distributed arrays • DASH a C++ template library for distributed data structures with support for hierarchical locality • SHMEM a family of libraries supporting parallel scientific computing on distributed arrays • X10 a parallel language developed by IBM under the DARPA HPCS project • Fortress a parallel language developed by Sun Microsystems under the DARPA HPCS project • Titanium an explicitly parallel dialect of Java developed at UC Berkeley to support scientific high-performance computing on large-scale multiprocessors • Split-C a parallel extension of the C programming language that supports efficient access to a global address space • The Adapteva Epiphany architecture is a manycore network on a chip processor with scratchpad memory addressable between cores. ==See also==
Source: Wikipedia ↗
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