commit | a57c879dbca95316ecf50f5e96143eb9f7d1acb8 | [log] [tgz] |
---|---|---|
author | djasper <djasper@google.com> | Wed Feb 20 00:53:33 2019 -0800 |
committer | Copybara-Service <copybara-worker@google.com> | Wed Feb 20 00:55:17 2019 -0800 |
tree | a6c05d9694e21bf8299aefaec6f36c04604a423b | |
parent | 3b6e35ed0c387705bbe68d0d787a01f719c75302 [diff] |
Implement asynchronous glob prefetching to specifically prefetch the globs() of a file. There is currently a mechanism in Bazel to asynchronously go off and prefetch file system content, specifically by recursively reading subdirectories up to maxDirectoriesToEagerlyVisitInGlobbing. This is started when the first glob in a file is found. It is useful to warm up caches in networked filesystems, but doesn't actually help evaluating the globs(). As it can create extra load on the filesystem, it can actually make evaluation slower. Moreover, it implicitly relies on the fact that in common packages, most files are actually read into globs() in some way, which isn't always the case. Instead, we can visit a build file's AST and eagerly try to explicitly extract globs that should be visited. This change is doing that if maxDirectoriesToEagerlyVisitInGlobbing is set to a sentinal value of -2. The visitor cannot understand all globs, e.g. when some of the pattern strings are constructed from complex expression, but the majority of globs is explicitly spelled out. RELNOTES: None. PiperOrigin-RevId: 234751342
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