From 02e2c0d0edf422583a522553dfdbd4a47741caa1 Mon Sep 17 00:00:00 2001
From: William Chargin <wchargin@gmail.com>
Date: Thu, 23 Jan 2020 10:30:16 -0800
Subject: [PATCH 1/2] =?UTF-8?q?ci:=20don=E2=80=99t=20store=20Pip=20HTTP=20?=
 =?UTF-8?q?cache?=
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Summary:
The Pip HTTP cache stores all downloaded wheels and is never evicted.
With new `tf-nightly` wheels every day, this adds up quickly. We last
cleared our Travis caches about a month ago, and they’re up to 14.3 GB.

Investigation shows that the Pip HTTP cache accounts for the majority of
the cache (about 70% after about a month of cache accrual), and also
that jobs with larger caches have significantly longer startup times,
with delta on the order of 8 minutes (again, after about a month). Also,
uploading large caches at the end of a job can take minutes, and Travis
doesn’t report success until this finishes. Fetching `tf-nightly` should
be comparatively cheap.

Caches may need to be cleared for this to take effect. We’ll find out.

Test Plan:
See what Travis thinks.

wchargin-branch: ci-drop-pip-http-cache
---
 .travis.yml | 2 --
 1 file changed, 2 deletions(-)

diff --git a/.travis.yml b/.travis.yml
index 4fe52c9b4c..6e4b0d26a3 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -23,8 +23,6 @@ env:
     - TF_VERSION_ID=  # Do not install TensorFlow in this case
 
 cache:
-  # Reuse the pip cache directory across build machines.
-  pip: true
   # Cache directories for Bazel. See ci/bazelrc for details.
   directories:
     - $HOME/.cache/tb-bazel-repo

From 5af3b8249e678e40e80217baacf13504d3584cc5 Mon Sep 17 00:00:00 2001
From: William Chargin <wchargin@gmail.com>
Date: Thu, 23 Jan 2020 11:29:45 -0800
Subject: [PATCH 2/2] [update patch]

wchargin-branch: ci-drop-pip-http-cache
wchargin-source: 87d25ebd4ffd6db7bff21fa755b897892df1488d
---
 .travis.yml | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/.travis.yml b/.travis.yml
index 6e4b0d26a3..3bdd2ea0a8 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -23,6 +23,10 @@ env:
     - TF_VERSION_ID=  # Do not install TensorFlow in this case
 
 cache:
+  # Don't cache the Pip directory. We pull in a new `tf-nightly` wheel
+  # every day, and Pip caches are never evicted, so this quickly bloats
+  # to many gigabytes and adds minutes to the CI time.
+  pip: false
   # Cache directories for Bazel. See ci/bazelrc for details.
   directories:
     - $HOME/.cache/tb-bazel-repo