pip install of a directory is super slow

See https://github.com/pypa/pip/issues/2195#issuecomment-524606986, for a summary of this issue.

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I am dubious of why pip needs 17 seconds to process a local directory that is not on NFS (in fact, it’s on an SSD drive) for pip, which has no dependencies, since everything is vendored.

$ time pip install --no-install ~/dev/git-repos/pip
DEPRECATION: --no-install and --no-download are deprecated. See https://github.com/pypa/pip/issues/906.
Processing /Users/marca/dev/git-repos/pip
  Requirement already satisfied (use --upgrade to upgrade): pip==6.0.dev1 from file:///Users/marca/dev/git-repos/pip in /Users/marca/dev/git-repos/pip
pip install --no-install ~/dev/git-repos/pip  2.80s user 5.86s system 50% cpu 17.205 total

It should probably at least be logging whatever is taking that long, but maybe it shouldn’t even be doing whatever it’s doing.

Note that the “Processing” line appears right away and pretty much the whole delay seems to be between that line and the next one.

[pradyunsg]

Implementing PEP 517 will solve this.

Narrator: it didn’t.

[dkbarn]

FYI for those who are running into this issue – A workaround is to replace pip install . with:

python setup.py bdist_wheel
pip install dist/*.whl