make sure your device code is actually called. check all return codes and confirm that device actually worked on the output. sometimes thrust may run the code on host if it believes it is more effective.

i would really recommend updating to 10.8 - it has the latest drivers with the best support for nvidia geforce 6xx series.

also note that for optimum experience you need to have different gpus for display and cuda debugging - otherwise mac os x may interfere and kill the debugger.

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