Merge pull request #2614 from devitocodes/tweak-gpuinfo

arch: Improve GPU autodetection

Author: FabioLuporini

devito/arch/archinfo.py

@@ -192,7 +192,7 @@ def homogenise_gpus(gpu_infos):
 
         warning('Different models of graphics cards detected')
 
-        return {}
+        return {'ncards': len(gpu_infos)}
 
     # Parse textual gpu info into a dict