Continuous integration testing of GPUSolver

[GiudGiud]

Now that the GPUSolver is back online (thanks to @gridley), it'd be great to make sure new PRs do not break it. To do that, it should be part of our test suite, with a few limitations.

• Travis CI doesn't provide a GPU in its free version to my knowledge, so this test would only be run locally
• Most users did not install CUDA or many do not have a nVidia GPU, so it should be an option to the general test suite. Like : python run_tests.py --with-cuda

[lishunde]

I tried to use the GPU to solve the c5g7-3D algorithm, but always reported an error (2d can run normally), have you tested it in 3dMOC?

[gridley]

Hey @lishunde, it currently is not set up for 3D. Sorry about that.

[gridley]

@GiudGiud did you ever do this? Because it'll probably take like 10 minutes to write this.

[GiudGiud]

No I haven't. It's all yours if you want

[gridley]

Hey, so, this is something I'd like to get done. If we want to be testing on the latest CUDA version, it seems to require gcc 7. However, the Travis CI seems to currently be done with gcc-6. @GiudGiud you cool to switch to gcc 7?

[GiudGiud]

That's fine with me

[GiudGiud]

@gridley any progress on this ? I'm adding CMFD to the GPUSolver hence the renewed interest in proper testing of the GPUSolver.

[gridley]

Whoa, really!?? That’s awesome! I’ll definitely set this up then.