From ff37459c4b83966a604a46769a8b384d07b28492 Mon Sep 17 00:00:00 2001
From: Nguyễn Gia Phong <mcsinyx@disroot.org>
Date: Tue, 9 Mar 2021 22:24:01 +0700
Subject: Migrate the rest of GSoC'20 blogs

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++++
+rss = "GSoC 2020: Outro"
+date = Date(2020, 8, 31)
++++
+@def tags = ["pip", "gsoc"]
+
+# Outro
+
+> Steamed fish was amazing, matter of fact\
+> Let me get some jerk chicken to go\
+> Grabbed me one of them lemon pie theories\
+> And let me get some of them benchmarks you theories too
+
+\toc
+
+## The Look
+
+At the time of writing,
+{{pip 8771 "implementation-wise parallel download is ready"}}:
+
+[![asciicast](/assets/pip-8771.svg)](https://asciinema.org/a/356704)
+
+Does this mean I've finished everything just-in-time?  This sounds to good
+to be true!  And how does it perform?  Welp...
+
+## The Benchmark
+
+Here comes the bad news: under a decent connection to the package index,
+using `fast-deps` does not make `pip` faster.  For best comparison,
+I will time `pip download` on the following cases:
+
+### Average Distribution
+
+For convenience purposes, let's refer to the commands to be used as follows
+
+```console
+$ pip --no-cache-dir download {requirement}  # legacy-resolver
+$ pip --use-feature=2020-resolver \
+   --no-cache-dir download {requirement}  # 2020-resolver
+$ pip --use-feature=2020-resolver --use-feature=fast-deps \
+   --no-cache-dir download {requirement}  # fast-deps
+```
+
+In the first test, I used [axuy][] and obtained the following results
+
+| legacy-resolver | 2020-resolver | fast-deps |
+| --------------- | ------------- | --------- |
+| 7.709s          | 7.888s        | 10.993s   |
+| 7.068s          | 7.127s        | 11.103s   |
+| 8.556s          | 6.972s        | 10.496s   |
+
+Funny enough, running `pip download` with `fast-deps` in a directory
+with downloaded files already took around 7-8 seconds.  This is because
+to lazily download a wheel, `pip` has to {{pip 8670 "make many requests"}}
+which are apparently more expensive than actual data transmission on my network.
+
+@@colbox-blue
+With unstable connection to PyPI (for some reason I am not confident enough
+to state), this is what I got
+
+| 2020-resolver | fast-deps |
+| ------------- | --------- |
+| 1m16.134s     | 0m54.894s |
+| 1m0.384s      | 0m40.753s |
+| 0m50.102s     | 0m41.988s |
+
+As the connection was *unstable* and that the majority of `pip` networking
+is performed as CI/CD with large and stable bandwidth, I am unsure what this
+result is supposed to tell (-;
+@@
+
+### Large Distribution
+
+In this test, I used [TensorFlow][] as the requirement and obtained
+the following figures:
+
+| legacy-resolver | 2020-resolver | fast-deps |
+| --------------- | ------------- | --------- |
+| 0m52.135s       | 0m58.809s     | 1m5.649s  |
+| 0m50.641s       | 1m14.896s     | 1m28.168s |
+| 0m49.691s       | 1m5.633s      | 1m22.131s |
+
+### Distribution with Conflicting Dependencies
+
+Some requirement that will trigger a decent amount of backtracking by
+the current implementation of the new resolver `oslo-utils==1.4.0`:
+
+| 2020-resolver | fast-deps |
+| ------------- | --------- |
+| 14.497s       | 24.010s   |
+| 17.680s       | 28.884s   |
+| 16.541s       | 26.333s   |
+
+## What Now?
+
+I don't know, to be honest.  At this point I'm feeling I've failed my own
+(and that of other stakeholders of `pip`) expectation and wasted the time
+and effort of `pip`'s maintainers reviewing dozens of PRs I've made
+in the last three months.
+
+On the bright side, this has been an opportunity for me to explore the codebase
+of package manager and discovered various edge cases where the new resolver
+has yet to cover (e.g. I've just noticed that `pip download` would save
+to-be-discarded distributions, I'll file an issue on that soon).  Plus I got
+to know many new and cool people and idea, which make me a more helpful
+individual to work on Python packaging in the future, I hope.
+
+[TensorFlow]: https://www.tensorflow.org
+[axuy]: https://www.youtube.com/playlist?list=PLAA9fHINq3sayfxEyZSF2D_rMgDZGyL3N
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