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Performance tuning and setting up the input data file hpcg.dat
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Current as of release HPCG - 2.0 - January 28, 2014

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

After building the executable hpcg/bin/xhpcg, you may  want to 
modify the input  data  file  hpcg.dat.  This file should  re-
side  in  the  same directory as  the  executable hpcg/bin/xhpcg.
An example hpcg.dat file is provided by default. This file con-
tains information about the problem sizes, machine  configurat-
ion,  and  algorithm features to be used by the executable.
It is 4 lines long. All the  selected parameters  will be prin-
ted 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, you  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:

104 104 104

which means that each MPI process will be computing a solution for a cube of
size 104 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:

60

which means that the timed portion of the benchmark will run 1 minute.
This length of time is not sufficient for submitting an official run
but does give sufficient data for tuning the benchmark in most cases.

