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{{Anchor|VERSIONS}}
At present, the standard has several versions: version 1.3 (commonly abbreviated ''MPI-1''), which emphasizes message passing and has a static runtime environment, MPI-2.2 (MPI-2), which includes new features such as parallel I/O, dynamic process management and remote memory operations,<ref name="Gropp99adv-pp4-5">{{harvnb|Gropp|Lusk|Skjellum|1999b|pp=4–5}}</ref> and MPI-3.1 (MPI-3), which includes extensions to the collective operations with non-blocking versions and extensions to the one-sided operations.<ref name="MPI_3.1">[http://www.mpi-forum.org/docs/mpi-3.1/mpi31-report.pdf MPI: A Message-Passing Interface Standard<br />Version 3.1, Message Passing Interface Forum, June 4, 2015]. http://www.mpi-forum.org. Retrieved on 2015-06-16.</ref>
MPI-2's LIS specifies over 500 functions and provides language bindings for ISO [[C (programming language)|C]], ISO [[C++]], and [[Fortran 90]]. Object interoperability was also added to allow easier mixed-language message passing programming. A side-effect of standardizing MPI-2, completed in 1996, was clarifying the MPI-1 standard, creating the MPI-1.2.
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==Future==
Some aspects of the MPI's future appear solid; others less so. The MPI Forum reconvened in 2007 to clarify some MPI-2 issues and explore developments for a possible MPI-3, which resulted in versions MPI-3.0 (September 2012)<ref>https://www.mpi-forum.org/docs/mpi-3.0/mpi30-report.pdf {{Bare URL PDF|date=July 2025}}</ref> and MPI-3.1 (June 2015).<ref>https://www.mpi-forum.org/docs/mpi-3.1/mpi31-report.pdf {{Bare URL PDF|date=July 2025}}</ref> The development continued with the approval of MPI-4.0 on June 9, 2021,<ref>https://www.mpi-forum.org/docs/mpi-4.0/mpi40-report.pdf {{Bare URL PDF|date=July 2025}}</ref> and most recently, MPI-4.1 was approved on November 2, 2023.<ref>https://www.mpi-forum.org/docs/mpi-4.1/mpi41-report.pdf {{Bare URL PDF|date=July 2025}}</ref>
Architectures are changing, with greater internal concurrency ([[Multi-core processor|multi-core]]), better fine-grained concurrency control (threading, affinity), and more levels of [[memory hierarchy]]. [[Multithreading (computer architecture)|Multithreaded]] programs can take advantage of these developments more easily than single-threaded applications. This has already yielded separate, complementary standards for [[symmetric multiprocessing]], namely [[OpenMP]]. MPI-2 defines how standard-conforming implementations should deal with multithreaded issues, but does not require that implementations be multithreaded, or even thread-safe. MPI-3 adds the ability to use shared-memory parallelism within a node. Implementations of MPI such as Adaptive MPI, Hybrid MPI, Fine-Grained MPI, MPC and others offer extensions to the MPI standard that address different challenges in MPI.
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