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Kristoffer Carlsson KristofferC

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@KristofferC
KristofferC / NOTE.md
Created June 15, 2026 11:13

Why Julia's atomic modify doesn't fold to atomicrmw (and when it actually does)

Investigation notes for mwe.jl. Versions tested: 1.12.6, 1.13.0-rc1, 1.14.0-DEV.2212 (062a90bc8c). Source references are to julia master (6e40a4a448, 2026-06-08).

TL;DR

The MWE's code_llvm-based counting is partly misled by a reflection artifact. The real situation, measured on **native code of the actual JIT

@KristofferC
KristofferC / git-runic.jl
Created April 14, 2026 15:30
#!/usr/bin/env julia
#
#===- git-runic - Runic Git Integration ----------------------*- julia -*--===#
#
# Based on `git-clang-format`, which is part of the LLVM Project, under the
# Apache License v2.0 with LLVM Exceptions (see https://llvm.org/LICENSE.txt).
# SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
#
#===------------------------------------------------------------------------===#
@KristofferC
KristofferC / find_invalidations.jl
Created April 8, 2026 14:04
using SnoopCompileCore
# First load OhMyREPL so its methods are compiled
using OhMyREPL
# Now track invalidations caused by loading SymbolicUtils
invs = @snoop_invalidations using SymbolicUtils;
using SnoopCompile
using SnoopCompile: countchildren
@KristofferC
KristofferC / invalidations_vscodeserver.md
Created April 1, 2026 13:54

=== SnoopCompile Invalidations Report ===

rebinding Core.Binding(:(Base.HashArrayMappedTries.iterate), #undef, #undef, Any[CodeInstance for MethodInstance for getproperty(::Module, ::Symbol)], 0x00) invalidated:
   mt_backedges: 1: signature Base.HashArrayMappedTries.iterate triggered MethodInstance for getproperty(::Module, ::Symbol) (0 children)


inserting readline(io::VSCodeServer.IJuliaCore.IJuliaStdio) @ VSCodeServer.IJuliaCore ~/dyad1.12/julia-vscode/scripts/packages/IJuliaCore/src/stdio.jl:230 invalidated:
   backedges: 1: superseding readline(s::IO; keep) @ Base io.jl:619 with MethodInstance for readline(::IO) (2 children)
@KristofferC
KristofferC / function_tracer.jl
Created July 18, 2025 12:51
# use with Julia 1.11
using Cassette
Cassette.@context TraceCtx
mutable struct CallTrace
depth::Int
pending_newline::Bool
CallTrace() = new(0, false)
@KristofferC
KristofferC / plots_repro.md
Last active May 19, 2025 13:31

Plots.jl precompile issue

  • Create LocalPreferences.toml with 
    [PrecompileTools]
precompile_workloads = false
  • Install Plots + HTTP.
  • Run julia +1.10 --project --trace-compile=plots_compile.jl
  • Run the following:
@KristofferC
KristofferC / K
Created January 9, 2023 21:08
colptr = [1, 20, 53, 107, 138, 139, 158, 191, 224, 278, 332, 333, 364, 383, 402, 435, 468, 499, 530, 531, 550, 569, 588, 621, 675, 708, 741, 795, 849, 871, 893, 926, 959, 995, 1031, 1053, 1075, 1094, 1125, 1126, 1145, 1146, 1177, 1196, 1215, 1216, 1235, 1266, 1297, 1316, 1335, 1389, 1420, 1474, 1528, 1529, 1560, 1593, 1626, 1657, 1688, 1689, 1708, 1727, 1746, 1799, 1852, 1905, 1938, 1971, 2007, 2043, 2065, 2087, 2117, 2118, 2148, 2149, 2168, 2198, 2228, 2247, 2266, 2320, 2351, 2405, 2459, 2460, 2491, 2524, 2557, 2588, 2619, 2620, 2639, 2658, 2677, 2732, 2787, 2842, 2874, 2906, 2942, 2978, 3000, 3022, 3066, 3067, 3068, 3069, 3087, 3119, 3151, 3169, 3187, 3241, 3272, 3326, 3380, 3381, 3412, 3445, 3478, 3509, 3540, 3541, 3560, 3579, 3598, 3655, 3712, 3769, 3803, 3837, 3873, 3909, 3931, 3953, 4008, 4063, 4118, 4150, 4182, 4216, 4250, 4270, 4290, 4320, 4373, 4403, 4404, 4457, 4510, 4528, 4529, 4559, 4589, 4621, 4653, 4671, 4689, 4717, 4766, 4794, 4795, 4844, 4893, 4912, 4913, 4941, 4969, 5002, 5035, 5054, 5073, 50
@KristofferC
KristofferC / WSL_precompile
Last active January 3, 2023 13:46
precompile(Tuple{typeof(Base.setindex!), Base.RefValue{Union{Nothing, String}}, String})
precompile(Tuple{typeof(Requires.listenpkg), Any, Base.PkgId})
precompile(Tuple{typeof(Requires.loaded), Base.PkgId})
precompile(Tuple{typeof(Requires.callbacks), Base.PkgId})
precompile(Tuple{REPL.LineEdit.var"##refresh_multi_line#14", Base.Pairs{Symbol, V, Tuple{Vararg{Symbol, N}}, NamedTuple{names, T}} where T<:Tuple{Vararg{Any, N}} where names where N where V, typeof(REPL.LineEdit.refresh_multi_line), REPL.Terminals.TerminalBuffer, REPL.LineEdit.ModeState})
precompile(Tuple{typeof(Base.rand), Int64, Int64})
precompile(Tuple{typeof(RecipesBase.plot), Any})
precompile(Tuple{typeof(Base.haskey), Base.Dict{Symbol, Any}, Symbol})
precompile(Tuple{typeof(Base.get), Base.Dict{Symbol, Any}, Symbol, Symbol})
precompile(Tuple{typeof(Base.copy), Base.Dict{Symbol, Any}})
@KristofferC
KristofferC / master.asm
Created November 19, 2021 13:47
pushq %r15
pushq %r14
pushq %r13
pushq %r12
pushq %rbx
subq $2320, %rsp # imm = 0x910
movq (%rsi), %rdx
vmovupd 80(%rdx), %ymm12
vmovupd 112(%rdx), %ymm9
vmovupd 224(%rdx), %ymm3
@KristofferC
KristofferC / conversation
Last active May 25, 2020 07:08
Regarding this PR that kind of came out of the blue: https://github.com/JuliaLang/Pkg.jl/pull/1835
I've been thinking more and more about it, and I really like the idea of having preferences, by default, get stored to depot-wide preference files, but for there to still be an option to set preferences within the top-level Project. What this would look like is if you were to call @save_preferences(prefs), it would overwrite whatever is within ~/.julia/prefs/$uuid.toml, However, if you write @save_preferences(prefs, target=:project), then it would save the preferences into the Project.toml file:
name = "MyPackage"
uuid = "44cfe95a-1eb2-52ea-b672-e2afdf69b78f"
version = "1.0.0"
[deps]
Dates = "ade2ca70-3891-5945-98fb-dc099432e06a"
UUIDs = "cf7118a7-6976-5b1a-9a39-7adc72f591a4"
[preferences.1a6f20f1-ba5f-a4e8-2e79-39224701f35d]
foo = "true"