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MPI/en: Difference between revisions
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<!-- From Belaid: Probably we should used threads instead. As processes have there own private memory space - the term "ultimately" refers to the fact that the inter-process communication via shared memory --> | <!-- From Belaid: Probably we should used threads instead. As processes have there own private memory space - the term "ultimately" refers to the fact that the inter-process communication via shared memory --> | ||
In shared memory parallelism (commonly and casually abbreviated SMP), all processors see the same memory image, or to put it another way, all memory is globally addressable and all the processes can ultimately access it. Communication between processes on an SMP machine is implicit --- any process can ultimately read and write values to memory that can be subsequently accessed | In shared memory parallelism (commonly and casually abbreviated SMP), all processors see the same memory image, or to put it another way, all memory is globally addressable and all the processes can ultimately access it. Communication between processes on an SMP machine is implicit --- any process can ultimately read and write values to memory that can be subsequently accessed and manipulated directly by others. The challenge in writing these kinds of programs is data consistency: one should take extra care to ensure data is not modified by more than one process at a time. | ||