Compiling CP2K for HECToR

At a minimum, CP2K requires a Fortran 95 compiler, BLAS and LAPACK libraries in order to compile, and an MPI-2 implementation and ScaLAPACK library to build a parallel version. Optionally, FFT libraries, and the the libint[4] library, required for Hartree-Fock exchange (HFX) calculations, can also be used. There is a single Makefile, and the code comes with over 100 `arch' files which customise the make procedure to a particular system. By customising the existing CRAY-XT5.popt arch file, the following settings were used, and saved as CRAY-XT-CNL-pathscale.popt:

CC       = cc
CPP      = cpp
FC       = ftn -freeform
LD       = ftn
AR       = ar -r
           -D__parallel -D__BLACS -D__SCALAPACK
FCFLAGS  = -O3 -OPT:Ofast
LIBS     = -L/work/z01/z01/ibethune/cp2k/libint/lib \ 
           /work/z01/z01/ibethune/cp2k/cp2k/libint_tools/libint_cpp_wrapper.o \
           -lderiv -lint -lstdc++


To build the code the following was used:

module swap PrgEnv-pgi PrgEnv-pathscale
make ARCH=CRAY-XT-CNL-pathscale VERSION=popt

On HECToR, the linear algebra (BLAS, LAPACK, BLACS, ScaLAPACK) are provided in the libsci library which is loaded and linked by the default module environment. FFTW 3 is also available on HECToR and is found to give very good performance (see section 4). The FFTSG is an in-built set of FFT routines that can be used as a fallback where no FFT library is available on the system. Here, libint is built and linked in, but could easily be omitted by removing the -D__LIBINT definitation and the libraries in the LIBS variable.