Unify device_memory_limit parsing and set default to 0.8

[pentschev]

This should address the request to set a default value for device_memory_limit, as well as allowing fractions and unifying how LocalCUDACluster and dask-cuda-worker parse its value. Fixes #334 .

cc @beckernick @rjzamora

[quasiben]

Thank you @pentschev . Should we also update documentation ?

[quasiben]

I mean, do you want to call out the default setting in the docs? I'm happy to do this if you'd like

[pentschev]

I mean, do you want to call out the default setting in the docs? I'm happy to do this if you'd like

Are you referring to some docstrings or https://dask-cuda.readthedocs.io/en/latest/ ?

[quasiben]

https://dask-cuda.readthedocs.io/

[pentschev]

Sure, we can update that next week. I just found out that we can't mix types with click.option, which causes problems with having float/int/str in --device-memory-limit, something that we do in LocalCUDACluster, so I'll have to find a solution for that too.

[pentschev]

Sure, we can update that next week. I just found out that we can't mix types with click.option, which causes problems with having float/int/str in --device-memory-limit, something that we do in LocalCUDACluster, so I'll have to find a solution for that too.

Hopefully this is fixed in latest commits.

[codecov-io]

Codecov Report

Merging #439 (6e51a2a) into branch-0.17 (3cefcc0) will increase coverage by 0.21%.
The diff coverage is 100.00%.

@@               Coverage Diff               @@
##           branch-0.17     #439      +/-   ##
===============================================
+ Coverage        90.57%   90.79%   +0.21%     
===============================================
  Files               14       14              
  Lines              796      804       +8     
===============================================
+ Hits               721      730       +9     
+ Misses              75       74       -1     

Impacted Files	Coverage Δ
dask_cuda/cli/dask_cuda_worker.py	96.77% <ø> (ø)
dask_cuda/cuda_worker.py	71.95% <ø> (ø)
dask_cuda/local_cuda_cluster.py	81.33% <100.00%> (+0.32%)	⬆️
dask_cuda/utils.py	90.65% <100.00%> (+0.65%)	⬆️

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[pentschev]

@quasiben I updated the docs in 6e51a2a, please take a look when you have a chance.

[quasiben]

Thanks @pentschev !