Contemplate an rslurm backend

[wlandau-lilly]

Implementation would be similar to the future_lapply funcionality. @kendonB, do the examples in the rslurm vignette work for you? This would be the biggest reason for adding or not adding a separate backend. I do not want the drake code base to get too large, but I may add a special case if it makes or breaks a project that needs serious HPC.

[wlandau-lilly]

@kendonB I am particularly curious about your experience trying out slurm_apply().

[kendonB]

It almost works: earthlab/rslurm#15

[kendonB]

Got rslurm to work with the change suggested in earthlab/rslurm#15!

[wlandau-lilly]

Moot now that #115 is solved. Drake already has two completely independent ways to use SLURM, and that is plenty. But if someone has a burning desire to build in rslurm natively, I might be persuaded, and I will consider pull requests.

[wlandau-lilly]

@kendonB Sorry, I did not mean to sound dismissive of your efforts on rslurm. I am really glad you put in the time, and I am glad we have a backup. Nothing was wasted. Thank you.