RFC: Allow modular import of the api and models #771
Description
Using kubernetes==8.0.1 on Linux, importing the Python Kubernetes client imports every model and api, amounting to a 35 to 40 MB RSS overhead. It also brings a significant wall-time penalty (even on repeat runs, to remove the IO time).
Ideally, one should be able to only import the types they need, as the golang client allows to: imports are segmented by apigroup, for example one can only import core/v1 without the rest of the APIs.
Would that be possible, possibly on a different import path than kubernetes.client, to keep compatibility? I'm not familiar enough with how the swagger generator works to know where to look into.
Raw data
Python 3.6.7
$ /usr/bin/time python -c "print('OK')"
0.02user 0.00system 0:00.03elapsed 97%CPU (0avgtext+0avgdata 8744maxresident)k
0inputs+0outputs (0major+1032minor)pagefaults 0swaps
$ /usr/bin/time python -c "import json"
0.03user 0.00system 0:00.03elapsed 100%CPU (0avgtext+0avgdata 9328maxresident)k
0inputs+0outputs (0major+1156minor)pagefaults 0swaps
$ /usr/bin/time python -c "from kubernetes import client"
0.41user 0.08system 0:00.50elapsed 99%CPU (0avgtext+0avgdata 45356maxresident)k
0inputs+0outputs (0major+21877minor)pagefaults 0swaps
Python 2.7.15
$ /usr/bin/time python -c "print('OK')"
0.01user 0.00system 0:00.02elapsed 60%CPU (0avgtext+0avgdata 6452maxresident)k
0inputs+0outputs (0major+680minor)pagefaults 0swaps
$ /usr/bin/time python -c "import json"
0.01user 0.01system 0:00.04elapsed 69%CPU (0avgtext+0avgdata 6840maxresident)k
0inputs+0outputs (0major+770minor)pagefaults 0swaps
$ /usr/bin/time python -c "from kubernetes import client"
0.29user 0.32system 0:02.98elapsed 20%CPU (0avgtext+0avgdata 46124maxresident)k
0inputs+0outputs (0major+17298minor)pagefaults 0swaps