Auto-precompilation still performs excessive file system checks #2850
Description
Originally reported by @GunnarFarneback
In JuliaLang/julia#40890, we introduced a cache to reduce the number of excessive file system checks that were performed during calls to require as part of code loading.
However, automatic precompilation does not use that cache, which means that we are still performing excessive file system checks (e.g. calls to stat) during auto-precomp.
@GunnarFarneback was able to confirm that when auto-precomp is disabled (e.g. with export JULIA_PKG_PRECOMPILE_AUTO=false), the number of observed stat calls decreases drastically, which supports the hypothesis that auto-precomp is the culprit here.