PSA to speed up builds with multiple projects

[peterbrook]

Since Valdi uses bazel and doesn't distribute pre-built libraries yet, it can take a while to build and then if you bootstrap a new project it will need to rebuild everything.

To speed this up, one option is to do something like add this to ~/.bazelrc

build --disk_cache=~/.cache/bazel/disk-cache

I did this and then ran valdi build ios and saw:

• first project, took about 6.8min to build
• wrote ~1.6GB into that cache directory
• Also saw that the bazel-out directory in my project was about 1.5GB
• second project, took 30sec to build. saw the bazel-out directory was 640MB, I think because bazel only fetches the top level artifacts from cache rather than all intermediate.

In the future, maybe the project can offer a public read-only remote cache server to save more time here too.

[peterbrook]

Another useful one is

common --repository_cache=~/.cache/bazel/repo-cache

after doing bootstrap and build ios/android once, i see this folder is 1.1G too.

[clholgat]

Peter, can you add this to the documentation?

[peterbrook]

what do you think about adding it to valdi bootstrap by default?

[peterbrook]

@clholgat bump on ^ any concern about adding to bootstrap?