Add multi-GPU sample

1 files changed, 57 insertions, 0 deletions

diff --git a/samples/python/s020_3d_multiGPU.py b/samples/python/s020_3d_multiGPU.py
new file mode 100644
index 0000000..d6799c4
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+++ b/samples/python/s020_3d_multiGPU.py
@@ -0,0 +1,57 @@
+#-----------------------------------------------------------------------
+#Copyright 2013 Centrum Wiskunde & Informatica, Amsterdam
+#
+#Author: Daniel M. Pelt
+#Contact: D.M.Pelt@cwi.nl
+#Website: http://dmpelt.github.io/pyastratoolbox/
+#
+#
+#This file is part of the Python interface to the
+#All Scale Tomographic Reconstruction Antwerp Toolbox ("ASTRA Toolbox").
+#
+#The Python interface to the ASTRA Toolbox is free software: you can redistribute it and/or modify
+#it under the terms of the GNU General Public License as published by
+#the Free Software Foundation, either version 3 of the License, or
+#(at your option) any later version.
+#
+#The Python interface to the ASTRA Toolbox is distributed in the hope that it will be useful,
+#but WITHOUT ANY WARRANTY; without even the implied warranty of
+#MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+#GNU General Public License for more details.
+#
+#You should have received a copy of the GNU General Public License
+#along with the Python interface to the ASTRA Toolbox. If not, see <http://www.gnu.org/licenses/>.
+#
+#-----------------------------------------------------------------------
+
+import astra
+import numpy as np
+
+# Set up multi-GPU usage.
+# This only works for 3D GPU forward projection and back projection.
+astra.astra.set_gpu_index([0,1])
+
+# Optionally, you can also restrict the amount of GPU memory ASTRA will use.
+# The line commented below sets this to 1GB.
+#astra.astra.set_gpu_index([0,1], memory=1024*1024*1024)
+
+vol_geom = astra.create_vol_geom(1024, 1024, 1024)
+
+angles = np.linspace(0, np.pi, 1024,False)
+proj_geom = astra.create_proj_geom('parallel3d', 1.0, 1.0, 1024, 1024, angles)
+
+# Create a simple hollow cube phantom
+cube = np.zeros((1024,1024,1024))
+cube[128:895,128:895,128:895] = 1
+cube[256:767,256:767,256:767] = 0
+
+# Create projection data from this
+proj_id, proj_data = astra.create_sino3d_gpu(cube, proj_geom, vol_geom)
+
+# Backproject projection data
+bproj_id, bproj_data = astra.create_backprojection3d_gpu(proj_data, proj_geom, vol_geom)
+
+# Clean up. Note that GPU memory is tied up in the algorithm object,
+# and main RAM in the data objects.
+astra.data3d.delete(proj_id)
+astra.data3d.delete(bproj_id)