1270182 - Enable the newly supported caching on Travis's trusty beta infra

Status: RESOLVED FIXED

(Tree Management :: Treeherder, defect, P2)

Description

[Ed Morley [:emorley]]

Travis's Ubuntu Trusty beta infra didn't support caching of dependencies until now, which meant a time penalty of ~80seconds per job (which is ~25% of the reuntime of chunk #2).

This is now supported:
https://blog.travis-ci.com/2016-05-03-caches-are-coming-to-everyone

Comment 1

[GitHub Autolander Bot]

Attachment: [treeherder] mozilla:trusty-travis-caching > mozilla:master

Comment 2

[Treeherder GitHub Bugbot]

Commits pushed to master at https://github.com/mozilla/treeherder

https://github.com/mozilla/treeherder/commit/531b25352800f97997f01a06a58ea90f022663f6
Bug 1270182 - Travis: Add missing `--disable-pip-version-check`s

Makes all `pip install` invocations consistent.

https://github.com/mozilla/treeherder/commit/fcec28129a6c9a265fe38a7ea817769785f656fb
Bug 1270182 - Travis: Improve file comments

https://github.com/mozilla/treeherder/commit/82373329ca80042295b2d3e3aa039467be357058
Bug 1270182 - Travis: Enabling caching for the Ubuntu trusty jobs

Since it's now supported:
https://blog.travis-ci.com/2016-05-03-caches-are-coming-to-everyone

This will reduce the job runtime by 60-80s.

Similar to the container job (job chunk 1), since we're now caching the
virtualenv, we have to workaround the default virtualenv being polluted
with existing packages (by creating a clean one in another directory),
to avoid constant cache churn.