Workarounds for building Android 11 on 8GB RAM

8GB_android-11_compilation-note

Workarounds for building R on 8GB RAM environment:

1. At the start of the build:
[ 99% 138/139] /mnt/ssd/lineage/out/soong/.bootstrap/bin/soong_build /mnt/ssd/lineage/out/soong/build.ninja
This used to take around 30mins, after enabling zram now it takes around 30secs (thanks to @kdrag0n for the zram idea) which is on par with what happens in 16GB RAM building environments

sudo apt install zram-config for installing zram-config package
sudo nano /etc/fstab and add a # in front of the swap disk if you have one and then reboot
After booting cat /proc/swaps to check if zram is enabled or not

2. To avoid issues while building metalava (outOfMemoryException: java heap space)
Pick this commit --> https://github.com/verNANDo57/android_build_soong/commit/5743f1ba9d95ff9c1f418066dcfdde9197c53a5a

3. To avoid huge metalava compilation times, compile the api-stubs-docs and other packages manually first then continue with mka bacon etc

For example this is what I'm using now in LineageOS:
. build/envsetup.sh && lunch lineage_joyeuse-userdebug & mka api-stubs-docs & mka module-lib-api-stubs-docs & mka system-api-stubs-docs & mka test-api-stubs-docs & mka bacon

Each of those api-stubs-docs, module-lib-api-stubs-docs etc took around 4-7 mins
Increasing of heap from soong directory or other env exports are not required

Newbie here, I am build lineage17.1 for some purposes. The second guide is invalid for 17.1(android10).
How can I deal with the third one, how to build them separately, lineage use
source build/envsetup.sh && breakfast my_device_codename && croot && brunch my_device_codename
Stucking with
//frameworks/base:api-stubs-docs Metalava [common]
etc.

@mitltl , Do:
source build/envsetup.sh && lunch your_device_codename && mka api-stubs-docs && mka hiddenapi-lists-docs && mka system-api-stubs-docs && mka test-api-stubs-docs && mka bacon

For example:
source build/envsetup.sh && lunch lineage_joyeuse-userdebug && mka api-stubs-docs && mka hiddenapi-lists-docs && mka system-api-stubs-docs && mka test-api-stubs-docs && mka bacon

This guide is for android 11 only. If you need guide for android 10, then check this

Swap partition is to be disabled in fstab, but what about swap file?

soong.environment.used.build Android.bp fatal error: runtime: out of memory