Reduce latency of Revise.revise() #38906
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Perhaps the most annoying thing about Revise now is that the first revision is quite slow, about 3.1s on my machine. This PR drops the time to about 2.4s. Basically the idea is to precompile statements that Revise will need. Discovered via the new snoopi_deep/Core.Compiler.Timings framework.
For some reason (perhaps #32705?) most or all of these fail if they are emitted as precompile statements, so this moves them into Base itself. This drops the time for a revision down to 1.85s.
timholy
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latency
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(The second commit might interest @NHDaly 👀.) |
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Dec 20, 2020
Investigation via `SnoopCompile.@snoopi_deep` identified several opportunities to reduce latency: - JuliaLang/julia#38906 - JuliaDebug/JuliaInterpreter.jl#461 - JuliaDebug/LoweredCodeUtils.jl#58 Together with the changes here, the aggregate effect is to reduce the time for the first revision from 3.1s to about 1.5s. That's much more reasonable.
This was referenced Dec 20, 2020
timholy
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Dec 21, 2020
Investigation via `SnoopCompile.@snoopi_deep` identified several opportunities to reduce latency: - JuliaLang/julia#38906 - JuliaDebug/JuliaInterpreter.jl#461 - JuliaDebug/LoweredCodeUtils.jl#58 Together with the changes here, the aggregate effect is to reduce the time for the first revision from 3.1s to about 1.5s. That's much more reasonable.
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Perhaps the most annoying thing about Revise now is that the first revision is quite slow, about 3.1s on my machine.
This drops the time to 1.85s, a nice improvement.
This was curious, so by way of explanation I'm just going to paste the comments of both commits.
Commit 1:
Add precompiles to reduce time to first Revise.revise()
Perhaps the most annoying thing about Revise now is that the first
revision is quite slow, about 3.1s on my machine. This PR drops the time
to about 2.4s. Basically the idea is to precompile statements that
Revise will need.
Discovered via the new snoopi_deep/Core.Compiler.Timings framework.
Commit 2:
Internalize Revise precompiles into Base
For some reason (perhaps #32705?) most or all of these fail if they
are emitted as precompile statements, so this moves them into Base itself.
This drops the time for a revision down to 1.85s.
The commits are separate because it was an interesting discovery on its own, and the second is evidently ugly so it would be nice not to need it.