Nipype multiproc plugin modification to use GPU(s) as resources.

[schahid]

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Fixes # .

Changes proposed in this pull request

• Workflow nodes that run on GPUs can be scheduled similar to that of CPU resources. The plugin args will now require additionally "n_gpus" for total no. of GPUs to use and "ngpuproc" for no. of threads to start on a single GPU.

[satra]

it would be good to merge this with master and resolve the conflicts.

[satra]

@schahid - is this something you can take care of? or should we take it over?

[schahid]

@satra - sorry for the delay in replying...as i am on holidays...yes sure you can take it over. thanks a lot.

[satra]

just putting a note here that with the reorganization of this module in release 1.0, this will require some significant merge effort.

[effigies]

Foolishly enough, I took a shot at that some time last week.

https://github.com/nipy/nipype/compare/master...effigies:enh/gpu_management

Since it's @schahid's master branch, I don't want to push to it directly. If anybody wants to take ownership of this PR, they can push that branch to their own repo, and open a new PR. (Or @schahid can git merge my branch into their master and resume work on it, .)

[satra]

@effigies :)

@schahid - would it be possible for you to take it on from @effigies changes?

[schahid]

Hi @satra and @effigies I have merged your branch into my master branch. Please let me know what else I should do? Thanks.

[codecov-io]

Codecov Report

Merging #2298 into master will decrease coverage by 0.23%. The diff coverage is 47.02%.

@@            Coverage Diff             @@
##           master    #2298      +/-   ##
==========================================
- Coverage   66.66%   66.42%   -0.24%     
==========================================
  Files         328      339      +11     
  Lines       42529    47398    +4869     
  Branches     5278     5317      +39     
==========================================
+ Hits        28350    31485    +3135     
- Misses      13500    15171    +1671     
- Partials      679      742      +63

Flag	Coverage Δ
#smoketests	50.66% <44.86%> (-0.13%)	:arrow_down:
#unittests	63.96% <40.54%> (-0.02%)	:arrow_down:

Impacted Files	Coverage Δ
nipype/pipeline/plugins/multiproc.py	60.41% <47.02%> (-19.35%)	:arrow_down:
nipype/interfaces/nilearn.py	40% <0%> (-56.83%)	:arrow_down:
nipype/interfaces/nitime/analysis.py	43.15% <0%> (-36.85%)	:arrow_down:
nipype/utils/nipype_cmd.py	41.66% <0%> (-35%)	:arrow_down:
nipype/testing/fixtures.py	77.33% <0%> (-21.34%)	:arrow_down:
nipype/pipeline/plugins/tools.py	70.32% <0%> (-16.82%)	:arrow_down:
nipype/algorithms/confounds.py	51.71% <0%> (-15.6%)	:arrow_down:
nipype/interfaces/freesurfer/base.py	60.16% <0%> (-13.01%)	:arrow_down:
nipype/interfaces/ants/registration.py	67.04% <0%> (-6.04%)	:arrow_down:
nipype/workflows/smri/freesurfer/autorecon2.py	65.9% <0%> (-5.37%)	:arrow_down:
... and 96 more

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