3 Installing nbody

3.1 Requirements

nbody requires a reasonably new C++ compiler (currently, I have tested it only with g++ on Digital UNIX V4.0), which support 64 bit integer (as long). You may be able to change the source code to support 32-bit platform, but I have never tried.

Standard Makefile for nbody assumes that PGPLOT is available. It's easy to edit Makefile so that you can run nbody without PGPLOT.

3.2 Getting nbody

In Komaba astrophysics computer network, you can find the most recent version of nbody as

~makino/src/C++tree/export.tar.gz

It's also available at my Web cite

http://grape.c.u-tokyo.ac.jp/~makino/softwares/C++tree/

3.3 Compiling nbody

First go to the directory to which yo install nbody . Then extract the files from the tar file you've got.

Then, you may need to edit the Makefile according to your need. The default Makefile is designed for Digital UNIX platform with GRAPE-4 installed, and it looks like

PGPLOT_DIR = /usr/local/pgplot5.2
#PGPLOT_DIR = /data6/makino/PDS/pgplot_linux/pgplot
PGINCLUDE =  -I$(PGPLOT_DIR)
CFLAGS = $(FLOAT_OPTIONS) -DREAL=double -O4 -ffast-math -funroll-loops

# Add -DNOGRAPHICS for installation without PGPLOT
 CPPFLAGS =   -DNOGRAPHICS -DTREE $(PGINCLUDE) -pg $(FLOAT_OPTIONS) -O4   -ffast-math -funroll-loops
PGLIB     =  -L$(PGPLOT_DIR) -g3 -O4 -lcpgplot -lpgplot -lX11 -lUfor -lfor -lFutil -lm -lprof1 -lpdf
G4LIB =  -L/usr6/kawai/pub/lib -lg4a -lrt -lm
H3LIB = -L/usr2/makino/src/harp3board -lharp3  -lrt -lm 

LIBOBJS = pgetopt.o gravity.o BHtree.o second.o
LIBOBJSG4 = pgetopt.o  gravity_g4.o BHtree_g4.o second.o

EXPORT_FILES = BHtree.h nbody_particle.h vector.h \
               BHtree.C	gravity.C nbody.C pgetopt.C\
	       second.c \
	       Makefile nbody_guide.tex\
               samplein sampleparm samplelog  samplelog_g4 

export: export.tar.gz
	ls -al export.tar.gz
export.tar.gz: $(EXPORT_FILES)
	tar cvf export.tar  $(EXPORT_FILES)
	gzip export.tar 
gravity.o : gravity.C  nbody_particle.h
	g++  $(CPPFLAGS)  -c gravity.C
gravity_g4.o : gravity.C  nbody_particle.h
	g++  -DHARP3 $(CPPFLAGS)  -c gravity.C
	mv gravity.o gravity_g4.o

nbody.o : nbody.C  nbody_particle.h
	g++  -c    $(CPPFLAGS)  nbody.C 
nbody : nbody.C  nbody_particle.h $(LIBOBJS)
	g++  -DEVOLVE    $(CPPFLAGS) -o nbody nbody.C $(LIBOBJS) 
nbody_g4 : nbody.C  nbody_particle.h $(LIBOBJSG4)
	g++  -DEVOLVE    $(CPPFLAGS) -o nbody_g4 nbody.C $(LIBOBJSG4) $(PGLIB) $(G4LIB)
nbody_h3 : nbody.C  nbody_particle.h $(LIBOBJSG4)
	g++  -DEVOLVE    $(CPPFLAGS) -o nbody_h3 nbody.C $(LIBOBJSG4) $(H3LIB)

BHtree.o : BHtree.C  nbody_particle.h BHtree.h 
	g++    $(CPPFLAGS) -c BHtree.C 
BHtree_g4.o : BHtree.C  nbody_particle.h BHtree.h 
	g++ -DHARP3   $(CPPFLAGS) -c BHtree.C
	mv BHtree.o  BHtree_g4.o 
pgetopt.o : pgetopt.C  
	g++  $(CPPFLAGS)  -c pgetopt.C
samplelog: sampleparm nbody
	nbody < sampleparm > samplelog
samplelog_g4: sampleparm nbody_g4
	nbody_g4 < sampleparm > samplelog_g4

If you do not have PGPLOT, add -DNOGRAPHICS to CPPFLAGS. If you have one, specify the installed directory at PGPLOT_DIR.

If you have GRAPE-4, check G4LIB so that it points to the right directory. In addition, target name for HARP-3 (GRAPE-4 with Turbochannel driver) version ( nbody_h3) is also provided. This one uses H3LIB instead of G4LIB. To use this one in Komaba, change PGPLOT_DIR to /usr/local/pgplot or specify -NOGRAPHICS in CPPFLAGS

To compile nbody , just type

make nbody

make nbody_g4