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89 lines
3.7 KiB
Matlab
89 lines
3.7 KiB
Matlab
% FFT2_PARTIAL apply fftn only on smaller blocks (important for GPU)
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%
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% x = fft2_partial(x,split)
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%
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% Inputs:
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% **x - input array
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% *optional*
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% **split - number of blocks to split the array before FFT to save the memory
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%
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% *returns*
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% ++x fft2 transformed array
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%*-----------------------------------------------------------------------*
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%| |
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%| Except where otherwise noted, this work is licensed under a |
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%| Creative Commons Attribution-NonCommercial-ShareAlike 4.0 |
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%| International (CC BY-NC-SA 4.0) license. |
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%| |
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%| Copyright (c) 2017 by Paul Scherrer Institute (http://www.psi.ch) |
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%| |
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%| Author: CXS group, PSI |
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%*-----------------------------------------------------------------------*
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% You may use this code with the following provisions:
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%
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% If the code is fully or partially redistributed, or rewritten in another
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% computing language this notice should be included in the redistribution.
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%
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% If this code, or subfunctions or parts of it, is used for research in a
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% publication or if it is fully or partially rewritten for another
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% computing language the authors and institution should be acknowledged
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% in written form in the publication: “Data processing was carried out
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% using the “cSAXS matlab package” developed by the CXS group,
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% Paul Scherrer Institut, Switzerland.”
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% Variations on the latter text can be incorporated upon discussion with
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% the CXS group if needed to more specifically reflect the use of the package
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% for the published work.
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%
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% A publication that focuses on describing features, or parameters, that
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% are already existing in the code should be first discussed with the
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% authors.
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%
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% This code and subroutines are part of a continuous development, they
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% are provided “as they are” without guarantees or liability on part
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% of PSI or the authors. It is the user responsibility to ensure its
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% proper use and the correctness of the results.
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function x = fft2_partial(x,split, inverse)
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if nargin < 3
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inverse = false;
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end
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if nargin < 2 || isempty(split)
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%% empirical condition assuming FFT involved, may be too pesimistic
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%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
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mem_req = numel(x)*8 * log2(max(size(x,1),size(x,2)));
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%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
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if isa(x,'gpuArray')
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x = complex(x); % move directly to complex to include the expected memore requirements
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gpu = gpuDevice;
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split = ceil(mem_req / gpu.AvailableMemory);
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else
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if mem_req < 50e9
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% assume to have at least 50GB ram free ...
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split = 1;
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else
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avail_mem = utils.check_available_memory * 1e6;
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split = ceil(mem_req /avail_mem);
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end
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end
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end
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if any(split > 1)
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Ndims = ndims(x);
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for ax = 1:2
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x = math.fft_partial(x,ax,1+mod(ax+1,Ndims), split, inverse);
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end
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else
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if ~inverse
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x = fft2(x);
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else
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x = ifft2(x);
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end
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end
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end
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