Kristoffer Carlsson

Significant GC collection time in Pkg.add (and other performance related things)

4

``` julia> @time Pkg.add("Plots") Resolving package versions... No Changes to `~/.julia/environments/v1.11/Project.toml` No Changes to `~/.julia/environments/v1.11/Manifest.toml` 0.785516 seconds (4.85 M allocations: 359.270 MiB, 24.80% gc time) julia> @time Pkg.add("Plots") Resolving package...

Separating the basic parsing infrastructure from the concrete Julia parser (or BYOT, Bring Your Own Tokenizer)

1

There is a lot of nice infrastructure to write custom parsers in JuliaSyntax.jl and there is an example of that in e.g. https://github.com/JuliaLang/JuliaSyntax.jl/blob/main/prototypes/simple_parser.jl. The issue is that the tokenizer is...

Right now, the `syntax.jl` tests are skipped (https://github.com/JuliaLang/JuliaSyntax.jl/blob/2e965a159dd9f87d216d2d50ecbd2ed4f9af2c5a/test/parse_packages.jl#L41-L46). However, this causes us to sometimes regress, see e.g. https://github.com/JuliaLang/julia/pull/57188/files#diff-266674e240feff7742a800c1c360befe28cd7a20f49dada34fef94a122acd90b where the test got changed and then caused regressions https://github.com/JuliaLang/julia/issues/57223. It would...

More graceful behavior when bisecting julia

1

When bisecting julia it is quite easy to hit: ``` Failed to precompile BandedMatrices [aae01518-5342-5314-be14-df237901396f] to "/home/kristofferc/.julia/compiled/v1.13/BandedMatrices/jl_T9KPcx". ERROR: LoadError: could not load symbol "jl_tag_newly_inferred_enable": /tmp/jl_Rfu1Iv/bin/julia: undefined symbol: jl_tag_newly_inferred_enable Stacktrace: [1]...

Name shadowing of an import when assigning it to a function argument causes spurious unused import diagnostics

3

The following module causes a warning about an unused import but it is in fact used. ```julia module M using Base: wrap_string function f(wrap_string = wrap_string("foo", UInt32(1))) print(wrap_string) end end...

Regression in performance of FEM-code using AD in threaded loop in 1.12 vs 1.11.

5

The code below runs the file at https://github.com/Ferrite-FEM/Ferrite.jl/blob/kc/landau_opt/docs/src/literate-gallery/landau.jl which has the option to run the assembly routine with `Threads.@threads` or not. It is using a bad style of parallelism with...

no longer bundle pkgimages for stdlibs with forced bounds checking since Pkg.test no longer defaults to this

4

To be merged if https://github.com/JuliaLang/Pkg.jl/pull/4494 is merged. Triage might have fun with this one. To be decided for 1.13. For people that want to test with forced bounds check on...

```jl julia> struct S{T} end julia> struct Q{T} end julia> (f(s::S) where {T})::Q{T} = 1 ERROR: syntax: invalid assignment location "SSAValue(23) where T" Stacktrace: [1] top-level scope at REPL[3]:1 ```