Kitchen Sink has 129 functions and each has many arguments
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This completeness is strength and weakness!
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Hard to implement efficiently and hard to learn
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It is not a complete operating environment and does not have ability to create and spawn processes etc.
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PVM is previous dominant approach
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It is very simple with much less functionality than MPI
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However it runs on essentially all machines including workstation clusters
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Further it is complete albeit simple operating environment
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MPI outside distributed computing world with HTTP of the Web, ATM protocols and systems like ISIS from Cornell
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However it does look as though MPI is being adopted as general messaging system by parallel computer vendors
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