Soong vs. Make: build time data?

[Anuj Goyal]

Does anyone have any comparison data on Soong biuld times vs. Make build times?

1. Initial build

2. Incremental builds

https://android.googlesource.com/platform/build/soong/

-Anuj

[Colin Cross]

The answer differs depending on which platform version you are
building and what you are changing in the incremental build.

In M, builds are done entirely using make. All incremental builds
take 1-2 minutes just to parse the makefiles.

In N we introduced Kati, which is a precursor of the Soong project.
Kati converts makefiles to a build.ninja files, and only needs to
regenerate the build.ninja file if a change has been made that affects
reading the makefiles (primarily editing a makefile, but also anything
that changes the results of a $(wildcard) or $(shell) command in a
makefile). This cuts incremental build times with no changes down to
~10 seconds, but some changes will still require the full 1-2 minutes
to reread all the makefiles. Clean build time should not be
significantly affected, it is dominated by running all the compile
commands.

N also has a preview of Soong, which can be enabled with make
USE_SOONG=true. This will use Soong Android.bp files for a few
projects where they exist (primarily bionic/ and its dependencies),
ignoring the Android.mk files there. Again, clean build time will
not be affected, but many modifications to the Android.bp file will
only take ~5 seconds to regenerate the manifest instead of 1-2 minutes
for an Android.mk file. Some information like the list of module
names and their installation dependencies still need to be exported to
make, so some changes to an Android.bp file may trigger rereading
makefiles and take 1-2 minutes.

In AOSP master, Soong is always enabled, and many projects only have
Android.bp files now. Incremental build performance is similar to N
with USE_SOONG=true.

The targets for Soong is to have an incremental build with no changes
be under 5 seconds, and the time to start running build commands to be
under 10 seconds for all incremental builds.

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