README for bhnbody1  Copyright J. Makino 2003-

This file describes how to compile and make test run for nbody1

0. Getting the file

Look at http://grape.astron.s.u-tokyo.ac.jp/~makino/softwares

1. Copyright:

I follow the MIT license:

http://www.opensource.org/licenses/mit-license
--------------------------------------------------------------

The MIT License

Copyright (c) 2003 Jun Makino

Permission is hereby granted, free of charge, to any person obtaining
a copy of this software and associated documentation files (the
"Software"), to deal in the Software without restriction, including
without limitation the rights to use, copy, modify, merge, publish,
distribute, sublicense, and/or sell copies of the Software, and to
permit persons to whom the Software is furnished to do so, subject to
the following conditions: 

The above copyright notice and this permission notice shall be
included in all copies or substantial portions of the Software. 

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. 

--------------------------------------------------------------

Note that this applies to the part I wrote. Most of the original code
was written by Sverre Aarseth and copyright belongs to him.

2. Platform

The current version is tested ONLY on a linux (kernel 2.4.18) on Intel
x86 using GCC 3.2.

3. Installing

After extracted the source files, you will need to edit makefiles

(Makefile.g77 and Makefile.g6lx) to set correct path for g77 fortran
compiler and grape6 library. 

make -f Makefile.g77

will make nbody1_s, which is a host-only version

make -f Makefile.g6lx

will make nbody1_g6lx, a GRAPE-6 version

4. Testing

I provide one test input parameter file, testin

nbody1_g6lx < testin

should create something like:


 T =    0.000  Q = 0.50  STEPS =          0          0          0
  DE=  0.000E+00  0.000E+00  E = -0.25066
 CM  :   -0.130498E-07  -0.978288E-08  -0.265915E-07
 CMV :    0.510450E-08  -0.886712E-09  -0.433698E-09
 AM  :   -0.838052E-02  -0.543369E-03   0.823090E-02
 new eta =   0.0220000005
CPU min =           0.220167
allocate jp buffer of size 2176
 Number of pipes =  48
 end sending j
 intgrt,   0.0626220703  0.0625
CPU min =           0.224667

 T =    0.062  Q = 0.50  STEPS =      30789        304          0
  DE=  8.657E-09 -1.723E-08  E = -0.25066
 CM  :    0.195401E-07  -0.213285E-07  -0.644017E-08
 CMV :    0.558996E-08  -0.377818E-08   0.122131E-08
 AM  :   -0.838053E-02  -0.543362E-03   0.823091E-02
 new eta =   0.024200001
CPU min =           0.224667
 Number of pipes =  48
 end sending j
 intgrt,   0.125244141  0.125
CPU min =           0.228167

 T =    0.125  Q = 0.50  STEPS =      54300        748          0
  DE=  1.873E-08 -5.454E-08  E = -0.25066
 CM  :    0.196886E-08  -0.462849E-08  -0.218573E-08
 CMV :    0.632836E-08  -0.251430E-09  -0.264418E-08
 AM  :   -0.838052E-02  -0.543364E-03   0.823092E-02
 new eta =   0.0266200017
CPU min =           0.228167
 Number of pipes =  48
 end sending j
 intgrt,   0.187744141  0.1875
CPU min =           0.231667

 T =    0.188  Q = 0.50  STEPS =      77255       1153          0
  DE= -7.362E-09 -3.987E-08  E = -0.25066
 CM  :   -0.103841E-07  -0.143163E-07  -0.344985E-08
 CMV :   -0.107694E-08   0.913786E-10  -0.812838E-10
 AM  :   -0.838053E-02  -0.543362E-03   0.823092E-02
 new eta =   0.0292820025

         TIME =   0.19  TCOMP =    0.23  KZ(1) = 0