In order to reliably store Go test times in the Github Actions cache we
need to reduce our cache thrashing by not using more than 10gb over all
of our caches. This change reduces our cache usage significantly by
sharing Go module cache between our Go CI workflows and our build
workflows. We lose our per-builder cache which will result in a bit of
performance hit, but we'll enable better automatic rebalancing of our CI
workflows. Overall we should see a per branch reduction in cache sizes
from ~17gb to ~850mb.
Some preliminary investigation into this new strategy:
Prior build workflow strategy on a cache miss:
Download modules: ~20s
Build Vault: ~40s
Upload cache: ~30s
Total: ~1m30s
Prior build workflow strategy on a cache hit:
Download and decompress modules and build cache: ~12s
Build Vault: ~15s
Total: ~28s
New build workflow strategy on a cache miss:
Download modules: ~20
Build Vault: ~40s
Upload cache: ~6s
Total: ~1m6s
New build workflow strategy on a cache hit:
Download and decompress modules: ~3s
Build Vault: ~40s
Total: ~43s
Expected time if we used no Go caching:
Download modules: ~20
Build Vault: ~40s
Total: ~1m
Signed-off-by: Ryan Cragun <me@ryan.ec>
Co-authored-by: Ryan Cragun <me@ryan.ec>
