[Mpi-comments] Bug in example 7.9 about neighbourhood collectives

[Daniel Holmes]

In Figure 7.2 (part of example 7.9, in section 7.6, page 330, line 18), 
the call to "MPI_DIMS_CREATE" is erroneous because the first parameter 
is given as "comm" rather than "comm_size". To pass "comm_size", the 
example would need an extra variable declaration and an extra line of 
code (between lines 17 and 18) that calls the "MPI_COMM_SIZE" function.

Cheers,
Dan.

-- 
Dan Holmes
Applications Consultant in HPC Research
EPCC, The University of Edinburgh
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T: +44(0)131 651 3465
E: dholmes at epcc.ed.ac.uk

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