I mean I'm nowhere near the purse strings but this has literally been an issue off-and-on since I .. uh .. left the project. We were having an argument over it that very week. It means prioritizing cycle time in a way that seems to resist all rational planning. I don't get it.
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Like if someone with the correct authority said "we don't do any more feature work or bug fixing or anything until cycle time is down to 10 minutes", it would get solved. It's not like compilers that bootstrap and self-test that fast (without $infinite_aws_bill) can't be written.
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I’m fine with investing in automatic rollups (the fact that we have to do them bugs me too), but you lost me at “stop all feature/bug fix work until the compiler is 10x faster”.
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Replying to @pcwalton @graydon_pub and
I’m not even convinced it’s possible for Rust to compile that fast without simplifying the language a lot. Even if it were, you’re talking about a complete rewrite of major subsystems. Like either “rewrite the whole typechecker” or “rewrite LLVM”.
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Replying to @BRIAN_____ @graydon_pub and
Can you describe how to make rustc 10x as fast? Everyone says that of course it’s possible, 10x is easy to get, it’s just that nobody cares about compiler perf, etc. etc., And then everyone who tries ends up with, like, a perf boost of 10% if that.
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Replying to @sayrer @BRIAN_____ and
The self-hosting nature of the compile means that there is a strong serial bottleneck. The build time is not something that a caching build system will help with. Believe me, if it were, we’d have fixed that long ago.
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Apparently we have to have 3 versions of LLVM. See: https://github.com/rust-lang/rust/issues/49278 … Alex has done a ton of work on this. It’s not as simple as “just cache LLVM”. We already cache it in the build system, of course. This is more of a Travis CI issue. Switching to Bazel wouldn’t help.
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