On 16 May 2015 at 06:57, Robert Collins <robe...@robertcollins.net> wrote: > So, I am working on pip issue 988: pip doesn't resolve packages at all. > > This is O(packages^alternatives_per_package): if you are resolving 10 ... > Scaling the number of packages is relatively easy; scaling the number > of alternatives is harder. Even 300 packages (the dependency tree for > openstack) is ~2.4T combinations to probe.
I added a check for the exact number (when the current step limit is hit): Hit step limit during resolving, 22493640689038530013767184665222125808455708963348534886974974630893524036813561125576881299950281714638872640331745747555743820280235291929928862660035516365300612827387994788286647556890876840654454905860390366740480.000000 from 4038 versions in 205 packages after 100000 steps Which indicates a alternatives factor of ~20. And AIUI PyPI has a long tail itself, so its more common that folk will see > 5.7 factors, rather than less common. -Rob -- Robert Collins <rbtcoll...@hp.com> Distinguished Technologist HP Converged Cloud _______________________________________________ Distutils-SIG maillist - Distutils-SIG@python.org https://mail.python.org/mailman/listinfo/distutils-sig
