Contents:

1. Compiling your own Gadget2 code
2. Running Gadget2

Log in to the cluster, wget the source code and unpack, e.g.

localuser@mylaptop:~ $ ssh username@lengau.chpc.ac.za
Last login: Fri Apr 01 15:00:00 2016 from 10.128.23.235
[username@login1 ~]$ wget http://wwwmpa.mpa-garching.mpg.de/gadget/gadget-2.0.7.tar.gz
[username@login1 ~]$ tar zxvf gadget-2.0.7.tar.gz

Navigate into the Gadget-2.0.7/Gadget2/ directory - this is where the heart of the code is located. Edit the Makefile as required (note example Makefiles and parameter files located in Gadget-2.0.7/Gadget2/parameterfiles/). Before compiling, be sure to source the following modules and paths (HDF5 excluded here for now):

module add gcc/5.1.0 chpc/openmpi/1.8.8/gcc-5.1.0
UTILS_DIR=/apps/chpc/astro/utils/gcc/v510-openmpi188
GSL_INSTALL=gsl-1.16-build
FFTW_INSTALL=fftw-2.1.5-build
export PATH=$UTILS_DIR/$GSL_INSTALL/include:$PATH
export PATH=$UTILS_DIR/$GSL_INSTALL/bin:$PATH
export PATH=$UTILS_DIR/$FFTW_INSTALL/include:$PATH
export LD_LIBRARY_PATH=$UTILS_DIR/$GSL_INSTALL/lib:$LD_LIBRARY_PATH
export LD_LIBRARY_PATH=$UTILS_DIR/$FFTW_INSTALL/lib:$LD_LIBRARY_PATH

as well as add the appropriate “SYSTYPE”, e.g.

#--------------------------------------- Select target computer
 
SYSTYPE="CHPC"
 
ifeq ($(SYSTYPE),"CHPC")
CC       =  mpicc
OPTIMIZE =  -O3 -Wall
GSL_INCL =  -I/apps/chpc/astro/utils/gcc/v510-openmpi188/gsl-1.16-build/include
GSL_LIBS =  -L/apps/chpc/astro/utils/gcc/v510-openmpi188/gsl-1.16-build/lib -lgsl -lgslcblas
FFTW_INCL=  -I/apps/chpc/astro/utils/gcc/v510-openmpi188/fftw-2.1.5-build/include
FFTW_LIBS=  -L/apps/chpc/astro/utils/gcc/v510-openmpi188/fftw-2.1.5-build/lib
MPICHLIB =
HDF5INCL =
HDF5LIB  =
endif

Finally, to compile:

[username@login1 Gadget-2.0.7/Gadget2]$ make

This assumes you have successfully compiled Gadget and have put together an appropriate parameter file. For now, let's consider one of the examples provided in Gadget-2.0.7/Gadget2/parameterfiles/.

Make sure that you create the necessary paths (and directories) for the saving of Gadget2 snapshots (and other information) somewhere on the Lustre (scratch) filesystem i.e. /mnt/lustre/username/