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Android: Add docs for fast_local_dev_server.py

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Add a section to explain how to make use of the android fast local dev
server. This allows devs to greatly speed up their edit-build-deploy
cycles.

Bug: 1189333
Change-Id: Iaee9070d9f94cdd0c25492d5867134847d37f750
Fixed: 1189333
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2819041
Auto-Submit: Peter Wen <wnwen@chromium.org>
Commit-Queue: Robert Flack <flackr@chromium.org>
Reviewed-by: Robert Flack <flackr@chromium.org>
Reviewed-by: Mohamed Heikal <mheikal@chromium.org>
Cr-Commit-Position: refs/heads/master@{#871658}
This commit is contained in:
Peter Wen
2021-04-12 22:12:36 +00:00
committed by Chromium LUCI CQ
parent b2fedfd1cf
commit c4bf57626d
1 changed files with 21 additions and 0 deletions

21
docs/android_build_instructions.md

@ -380,6 +380,27 @@ Args that affect build speed:
* Lint usually takes > 60 seconds to run, so disabling it dramatically
reduces incremental build times.
#### Running analysis build steps in the background
Normally analysis build steps like lint and errorprone will run in parallel with
the rest of the build. The build will then wait for all analysis steps to
complete successfully. By offloading analysis build steps to a separate build
server to be run lazily at a low priority when the machine is idle, the actual
build can complete up to 50-80% faster.
To take advantage of this speedup, run the script at
[//build/android/fast_local_dev_server.py][fast_local_dev] in a separate
terminal window. All your local builds will now forward analysis
steps to this server. Analysis steps include android lint, errorprone, bytecode
processor, etc. The output of these analysis checks will then be displayed in
the terminal window running the server.
**Note**: Since the build completes before the analysis checks finish, the build
will not fail if an analysis check fails. Make sure to check the terminal that
the server is running in at regular intervals to fix outstanding issues caught
by these analysis checks.
[fast_local_dev]: https://source.chromium.org/chromium/chromium/src/+/master:build/android/fast_local_dev_server.py
#### Incremental Install
[Incremental Install](/build/android/incremental_install/README.md) uses
reflection and sideloading to speed up the edit & deploy cycle (normally < 10