I'm running a benchmark of a Python script that uses pyCUDA. Each data point is one Python instance, and a Python instance might call a CUDA kernel fewer than five times, in these cases.
The red plots show the benchmark when lightdm is stopped, and the blue dots when it is running. The vertical axis is seconds. I would have expected the performance to be lower with lightdm running. System is Ubuntu 12.04 with a GeForce 460. Any ideas? Thanks