after the proliferarion of modules and libraries, I have collected into a
single variable BASEMOD_FLAGS, defined in make.inc, the list of directories
for modules, to be included by all codes. IMPORTANT NOTICE: re-run "configure",
the new Makefiles work in conjunction with the new make.inc
- adding new helper module to abstract FFT implementation specific
data distribution, and low level real space grid operations.
This will allow QE to link different FFTXlib implementations
tuned and optimized for specific HW or problems
git-svn-id: http://qeforge.qe-forge.org/svn/q-e/trunk/espresso@13731 c92efa57-630b-4861-b058-cf58834340f0
In real space processors are organized in a 2D pattern.
Each processor owns data from a sub-set of Z-planes and a sub-set of Y-planes.
In reciprocal space each processor owns Z-columns that belong to a sub set of
X-values. This allows to split the processors in two sets for communication
in the YZ and XY planes.
In alternative, if the situation allows for it, a task group paralelization is used
(with ntg=nyfft) where complete XY planes of ntg wavefunctions are collected and Fourier
trasnformed in G space by different task-groups. This is preferable to the Z-proc + Y-proc
paralleization if task group can be used because a smaller number of larger ammounts of
data are transferred. Hence three types of fft are implemented:
!
!! ... isgn = +-1 : parallel 3d fft for rho and for the potential
!
!! ... isgn = +-2 : parallel 3d fft for wavefunctions
!
!! ... isgn = +-3 : parallel 3d fft for wavefunctions with task group
!
!! ... isgn = + : G-space to R-space, output = \sum_G f(G)exp(+iG*R)
!! ... fft along z using pencils (cft_1z)
!! ... transpose across nodes (fft_scatter_yz)
!! ... fft along y using pencils (cft_1y)
!! ... transpose across nodes (fft_scatter_xy)
!! ... fft along x using pencils (cft_1x)
!
!! ... isgn = - : R-space to G-space, output = \int_R f(R)exp(-iG*R)/Omega
!! ... fft along x using pencils (cft_1x)
!! ... transpose across nodes (fft_scatter_xy)
!! ... fft along y using pencils (cft_1y)
!! ... transpose across nodes (fft_scatter_yz)
!! ... fft along z using pencils (cft_1z)
!
! If task_group_fft_is_active the FFT acts on a number of wfcs equal to
! dfft%nproc2, the number of Y-sections in which a plane is divided.
! Data are reshuffled by the fft_scatter_tg routine so that each of the
! dfft%nproc2 subgroups (made by dfft%nproc3 procs) deals with whole planes
! of a single wavefunciton.
!
fft_type module heavily modified, a number of variables renamed with more intuitive names
(at least to me), a number of more variables introduced for the Y-proc parallelization.
Task_group module made void. task_group management is now reduced to the logical component
fft_desc%have_task_groups of fft_type_descriptor type variable fft_desc.
In term of interfaces, the 'easy' calling sequences are
SUBROUTINE invfft/fwfft( grid_type, f, dfft, howmany )
!! where:
!!
!! **grid_type = 'Dense'** :
!! inverse/direct fourier transform of potentials and charge density f
!! on the dense grid (dfftp). On output, f is overwritten
!!
!! **grid_type = 'Smooth'** :
!! inverse/direct fourier transform of potentials and charge density f
!! on the smooth grid (dffts). On output, f is overwritten
!!
!! **grid_type = 'Wave'** :
!! inverse/direct fourier transform of wave functions f
!! on the smooth grid (dffts). On output, f is overwritten
!!
!! **grid_type = 'tgWave'** :
!! inverse/direct fourier transform of wave functions f with task group
!! on the smooth grid (dffts). On output, f is overwritten
!!
!! **grid_type = 'Custom'** :
!! inverse/direct fourier transform of potentials and charge density f
!! on a custom grid (dfft_exx). On output, f is overwritten
!!
!! **grid_type = 'CustomWave'** :
!! inverse/direct fourier transform of wave functions f
!! on a custom grid (dfft_exx). On output, f is overwritten
!!
!! **dfft = FFT descriptor**, IMPORTANT NOTICE: grid is specified only by dfft.
!! No check is performed on the correspondence between dfft and grid_type.
!! grid_type is now used only to distinguish cases 'Wave' / 'CustomWave'
!! from all other cases
Many more files modified.
git-svn-id: http://qeforge.qe-forge.org/svn/q-e/trunk/espresso@13676 c92efa57-630b-4861-b058-cf58834340f0
that the F77_FUNC trick was used also in FFTXlib/fftw.c. Now it is removed for
good. There is a new file of interfaces. In case of a strange behavior with
FFTW, this is for sure the culprint.
git-svn-id: http://qeforge.qe-forge.org/svn/q-e/trunk/espresso@13642 c92efa57-630b-4861-b058-cf58834340f0
1) routines fwfft and invfft moved out of file fft_interfaces.f90 into new
file fft_fwinv.f90. Prevents massive recompilation if something changes
in the FFT routines.
2) machine-dependent fft_scalar.*.f90 are now modules with different names,
conditionally included into fft_scalar with a USE, no longer an #include.
Avoids trouble with dependencies, allow simplification of makedeps.sh.
All changes should be harmless, but I have tested only FFTW, FFTW3, DFTI.
Please let me know if there is any problem
git-svn-id: http://qeforge.qe-forge.org/svn/q-e/trunk/espresso@13185 c92efa57-630b-4861-b058-cf58834340f0
not for efficiency but to make examples easier.
added test0 that uses fwfft and invfft, slight change to test
added a few directories (not yet used) to better organize the library
git-svn-id: http://qeforge.qe-forge.org/svn/q-e/trunk/espresso@12517 c92efa57-630b-4861-b058-cf58834340f0
prevent trouble with OS-X. May or may not work (it won't unless configure
is updated: please somebody with v.2.63 of autoconf do it), may turn out to
be obsolete anyway.
git-svn-id: http://qeforge.qe-forge.org/svn/q-e/trunk/espresso@12364 c92efa57-630b-4861-b058-cf58834340f0
Stefano de Gironcoli