Project4

Coursework in FYS4150 - Computational Physics at the University of Oslo.

We've here implemented the Metropolis algorithm (a Monte Carlo method) to model the phase transition of a ferromagnetic material. The Ising model is used to find the energy of each spin.

All of our simulations are run in two dimensions, and we've used between 2 and 100 particles in each dimension. To be able to run the larger ones of these with a sufficiently high number of Monte Carlo cycles we've used MPI parallelisation. However, this is only implemented in the master-branch. We also used one computer without MPI, and thus have one version with all the MPI-parts of the code emitted. This can be found in the branch "mette".

How to run the code

If running with MPI on the school computers, this should be included in the .pro-file in QT:

TEMPLATE = app  
CONFIG += console c++11  
CONFIG -= app_bundle  
CONFIG -= qt  

SOURCES += main.cpp  

QMAKE_CXX = /usr/lib64/openmpi/bin/mpicxx  
QMAKE_CXX_RELEASE = $$QMAKE_CXX  
QMAKE_CXX_DEBUG = $$QMAKE_CXX  
QMAKE_LINK = $$QMAKE_CXX  
QMAKE_CC = /usr/lib64/openmpi/bin/mpicc  

QMAKE_CFLAGS += $$system(/usr/lib64/openmpi/bin/mpicc --showme:compile)  
QMAKE_LFLAGS += $$system(/usr/lib64/openmpi/bin/mpicxx --showme:link)  
QMAKE_CXXFLAGS += $$system(/usr/lib64/openmpi/bin/mpicxx --showme:compile) -DMPICH_IGNORE_CXX_SEEK  
QMAKE_CXXFLAGS_RELEASE += $$system(/usr/lib64/openmpi/bin/mpicxx --showme:compile) -DMPICH_IGNORE_CXX_SEEK -O3  
QMAKE_CXXFLAGS_DEBUG += $$system(/usr/lib64/openmpi/bin/mpicxx --showme:compile) -DMPICH_IGNORE_CXX_SEEK -O3  

One also has to change the run settings to the following:

Executable:               /usr/lib64/openmpi/bin/mpirun  
Command line arguments:   -np 8 Project4  

Running the code on other computers with MPI, simply change the paths in both the .pro-file and the executable.