MPIjärjestelmät

MPIjärjestelmät refers to Message Passing Interface (MPI) systems. MPI is a standardized and portable message-passing system designed for parallel computing. It provides a set of routines for communication between processes, enabling them to exchange data and synchronize their operations. This allows for the development of parallel applications that can run on distributed memory systems, such as clusters of computers.

The core concept of MPI is the division of a computational problem into smaller parts that can be executed concurrently on different processors. These processes then communicate with each other using MPI functions like `MPI_Send` and `MPI_Recv` to share intermediate results or coordinate their tasks. MPI is widely used in scientific computing, high-performance computing (HPC), and various other fields where large-scale parallel processing is required.

MPI is not a programming language itself but rather a specification that can be implemented in various programming languages, most commonly C, C++, and Fortran. The specification defines a library of functions that programmers can call from their code. Implementations of MPI, such as Open MPI and MPICH, are available for a wide range of operating systems and hardware architectures. The use of MPI allows for the development of applications that can scale to a large number of processors, making it a cornerstone of modern supercomputing.