Preface
Implementation of the Message Passing Interface (MPI) is deemed one of the more exalted of systems programmer’s occupations: somewhat below the presumed complexity of an operating system (OS) with all its drivers, akin to a compiler and its runtime libraries, and more demanding than application programming. This is partly explained by the nature of the MPI itself: as just another software library in form, it sits between the MPI application (and thus the application level) and the hardware (and thus at and below the operating system level), striving to achieve the best possible performance. Of course, the important services of the operating system are called upon when necessary, however, now and then an MPI implementor must go down to ...
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