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Opened Jan 14, 2016 by Jonathan Jenkins@jenkins
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Document the default LP mapping

The default mapping of LPs to MPI ranks is block mapping, as in the following example for a 6 LP model running on 4 processes:

rank0 : LPs 0,1
rank1 : LPs 2,3
rank2 : LPs 4
rank3 : LPs 5
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Reference: codes/codes#100