| commit | 5b0255956799ab54a9d5dc1a532a028356366115 | [log] [tgz] |
|---|---|---|
| author | jmmv <jmmv@google.com> | Tue May 29 12:03:21 2018 -0700 |
| committer | Copybara-Service <copybara-piper@google.com> | Tue May 29 12:04:44 2018 -0700 |
| tree | b54caa748fcf4705a9c79f57f8719604a5ce48c8 | |
| parent | 74a895dbd3bfe24edcb3a220eec66461c27216f4 [diff] |
Minimize the cost of Skyframe restarts during CC autoconfiguration. Repository functions restart whenever they have to resolve a label due to the way Skyframe currently works. This is problematic because such functions are often costly: they try to detect features of the host system by building and running tools, and they touch the file system. To minimize the cost of these restarts, which are unavoidable, resolve the paths to all necessary labels upfront. This way, while the restarts still happen, they have no side-effects and thus are cheap. As a side-effect of this work, remove the strange and undocumented "tpl" function, which only made things more cryptic and harder to refactor. This cuts down Bazel's own analysis time on macOS on my Mac Pro 2013 from 14 seconds to 6 seconds by trimming about 15 unnecessary rebuilds and executions of the xcode-locator-bin tool to just 1. In other words: one fewer awkward pause during analysis time. Additionally, there is the hope that this will fix the problems users observe where Bazel writes persistent garbage during autoconfiguration (needing "clean --expunge" to recover) when Visual Studio Code is running and Santa is enabled on macOS; see https://github.com/bazelbuild/bazel/issues/4603. This is most likely a bug in Santa (see https://github.com/google/santa/issues/260) but we were tickling it due to our apparently-abusive behavior of building, executing, and then removing the same thing over and over again. Fixes https://github.com/bazelbuild/bazel/issues/5196 and should also fix https://github.com/bazelbuild/bazel/issues/4603. RELNOTES: None. PiperOrigin-RevId: 198434395
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