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2026-09-18 00:09:10 +09:00 · 2026-08-07 15:56:42 +09:00
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+% ASTRA_FIND_OPTIMAL_SPLIT Find optimal split of data and make the blocks sufficiently small for
+% limited GPU memory
+%
+% split = ASTRA_find_optimal_split(cfg, num_gpu, angle_blocks, propagator)
+%
+% Inputs:
+%     **cfg - config structure generated by ASTRA_initialize
+%     **num_gpu - number of gpu to split the data 
+%     **angle_blocks - number of angular blocks (ie in SART method or FSC)
+%     **propagator - which propagator should be assumed : FWD, BACK, both (default)
+% Outputs:
+%     ++split - volume / angle split - [split_x,split_y,split_z,split_angles]   
+
+
+%*-----------------------------------------------------------------------*
+%|                                                                       |
+%|  Except where otherwise noted, this work is licensed under a          |
+%|  Creative Commons Attribution-NonCommercial-ShareAlike 4.0            |
+%|  International (CC BY-NC-SA 4.0) license.                             |
+%|                                                                       |
+%|  Copyright (c) 2017 by Paul Scherrer Institute (http://www.psi.ch)    |
+%|                                                                       |
+%|       Author: CXS group, PSI                                          |
+%*-----------------------------------------------------------------------*
+% You may use this code with the following provisions:
+%
+% If the code is fully or partially redistributed, or rewritten in another
+%   computing language this notice should be included in the redistribution.
+%
+% If this code, or subfunctions or parts of it, is used for research in a 
+%   publication or if it is fully or partially rewritten for another 
+%   computing language the authors and institution should be acknowledged 
+%   in written form in the publication: “Data processing was carried out 
+%   using the “cSAXS matlab package” developed by the CXS group,
+%   Paul Scherrer Institut, Switzerland.” 
+%   Variations on the latter text can be incorporated upon discussion with 
+%   the CXS group if needed to more specifically reflect the use of the package 
+%   for the published work.
+%
+% A publication that focuses on describing features, or parameters, that
+%    are already existing in the code should be first discussed with the
+%    authors.
+%   
+% This code and subroutines are part of a continuous development, they 
+%    are provided “as they are” without guarantees or liability on part
+%    of PSI or the authors. It is the user responsibility to ensure its 
+%    proper use and the correctness of the results.
+
+
+
+function split = ASTRA_find_optimal_split(cfg, num_gpu, angle_blocks, propagator)
+  
+    if gpuDeviceCount == 0
+        split = 1; 
+        return
+    end
+    
+    gpu = gpuDevice;
+    if nargin < 2 || num_gpu == 0
+        num_gpu = 1; 
+    end
+    if nargin < 3
+        angle_blocks = 1; 
+    end
+    if nargin < 4
+        propagator = 'both';
+    end
+    
+    Nangles = cfg.iProjAngles / angle_blocks;
+    if isfield(cfg, 'Grouping')
+        Nangles = min(Nangles, cfg.Grouping);
+    end
+    
+    split = [1,1,1]; 
+    if ismember(lower(propagator), {'fwd','both'})
+        split = max(split, ceil([cfg.iVolX, cfg.iVolY, cfg.iVolZ] /  4096 )); % texture memory limit
+        split = max(split, [1,1,ceil( (cfg.iVolX*cfg.iVolY*cfg.iVolZ*4) /  1.024e9 / prod(split)/num_gpu)]); % texture memory limit
+    end
+    split = max(split, [1,1,split(3)*ceil( ((cfg.iVolX*cfg.iVolY*cfg.iVolZ*4)/ prod(split)/num_gpu) / (gpu.AvailableMemory/2 - min(1.1e9, cfg.iVolX*cfg.iVolY*cfg.iVolZ*4)) )]); % gpu memory limit 
+    split = max(split, [1,1,split(3)*ceil( ((cfg.iVolX*cfg.iVolY*cfg.iVolZ  )/ prod(split)/num_gpu) / double(intmax('int32')) )]); % maximal array on GPU limit 
+
+    if ismember(lower(propagator), {'back','both'})
+        % if projection would be larger than 4096x4096 -> split the reconstruction volume 
+        split = max(split, [cfg.iProjU, cfg.iProjU,  cfg.iProjV]/4096 ); % texture memory limit 
+    end
+
+    % projection size limitation  +   astra allows only < 1024 angles
+    split(4)  = max(ceil(Nangles/1024), ceil( (cfg.iProjU*cfg.iProjV*min(1024,Nangles)*4) / gpu.TotalMemory/num_gpu)); % gpu memory limit 
+
+    % RAM limits 
+    if cfg.iVolX*cfg.iVolY*cfg.iVolZ > 2e6
+        freemem = 0.8 * utils.check_available_memory; 
+        split(4)  = max(split(4), num_gpu*(4*(cfg.iProjU*cfg.iProjV*cfg.iProjAngles...
+                                            + cfg.iVolX*cfg.iVolY*cfg.iVolZ*(1+1/prod(split(1:3)))))...
+                                            / (freemem * 1e6) ); % RAM memory limit 
+    end
+    split(4) = ceil(split(4)); 
+    split(1:3) = 2.^nextpow2(split(1:3));
+%     if any(split ~= 1)
+%         fprintf('Automatically splitting to %ix%ix%ix(%i) cubes \n', split);
+%     end
+
+end