[Distutils] PyPI is a sick sick hoarder

[Nick Coghlan]

On 17 May 2015 at 00:36, Justin Cappos <jcappos at nyu.edu> wrote:
> This only considers computation cost though.  Other factors can become more
> expensive than computation.  For example, SAT solvers need all the rules to
> consider.  So a SAT solution needs to effectively download the full
> dependency graph before starting.  A backtracking dependency resolver can
> just download packages or dependency information as it considers them.

This is the defining consideration for pip at this point: a SAT solver
requires publication of static dependency metadata on PyPI, which is
dependent on both the Warehouse migration *and* the completion and
acceptance of PEP 426. Propagation out to PyPI caching proxies and
mirrors like devpi and the pulp-python plugin will then take even
longer.

A backtracking resolver doesn't have those gating dependencies, as it
can tolerate the current dynamic metadata model.

Cheers,
Nick.

-- 
Nick Coghlan   |   ncoghlan at gmail.com   |   Brisbane, Australia