How to setup multi-GPU under Linux?
1. setup all devices with aticonfig --initial --adapter=all
2. export DISPLAY=:0 to select all devices. :0.0 select only first, :0.1 second etc.
How to run OpenCL application via SSH or tty?
1. X-server must running with logged user into Xsession
2. log in as same user via SSH export DISPLAY=:0 and now you can run OpenCL application.
shortly you must ensure that remote session have access to local Xsession.
http://developer.amd.com/gpu_assets/App_Note-Running_ATI_Stream_Apps_Remotely.pdf
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