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Performance tuning and setting up the input data file hpcg.dat
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Current as of release HPCG - 1.0 - November 19, 2013

Check  the  website  http://software.sandia.gov/hpcg  for  the latest
information.

After  building  the executable hpcg/bin/xhpcg, one  may want  to  modify the
input  data  file  hpcg.dat.  This file should  reside  in  the  same directory
as  the  executable hpcg/bin/xhpcg.   An  example  hpcg.dat  file is provided
by default.  This  file  contains  information about the problem sizes,
machine configuration,  and  algorithm features to be used by the executable.
It is 4 lines long. All the selected parameters  will  be  printed in the
output generated by the executable.

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Description of the hpcg.dat file
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* Line 1: (unused) Typically  one  would  use this line for its own good. For
example, it could be used to summarize the con- tent of the input file. By
default this line reads:
 
HPCG benchmark input file
 
* Line 2: (unused) same as Line 1. By default, this line reads:
 
Sandia National Laboratories; University of Tennessee, Knoxville
 
* Line 3: This line specifies the local (to an MPI process) dimensions of the
problem. By default, this line reads:

100 100 100

which means that each MPI process will be computing a solution for a cube of
size 100 points.

* Line 4: This line specifies the number of seconds of how long the timed
portion of the benchmark should run. By default, this line reads:

18000

which means that the timed portion of the benchmark will run 5 hours.
