Loading JPEG image with ImageMagick becomes very slow in Julia 1.7

[etibarg]

Hello,

I've noticed a huge slowdown during image loading this morning, after migrating to julia 1.7.0.

Before:

julia> @time rgb = load("00070__.jpg")
  5.381018 seconds (97 allocations: 1.268 GiB, 3.26% gc time)
10652×14204 Array{RGB{N0f8},2} with eltype RGB{N0f8}:

After:

julia> @time rgb = load("00070__.jpg")
 85.531723 seconds (1.82 G allocations: 62.142 GiB, 8.78% gc time, 0.00% compilation time)
10652×14204 Array{RGB{N0f8},2} with eltype RGB{N0f8}:

The image weights ~30Mo.
Clearly, there's something wrong with the allocation. But what/why?

julia> versioninfo()
Julia Version 1.7.0
Commit 3bf9d17731 (2021-11-30 12:12 UTC)
Platform Info:
  OS: Windows (x86_64-w64-mingw32)
  CPU: 11th Gen Intel(R) Core(TM) i7-1165G7 @ 2.80GHz
  WORD_SIZE: 64
  LIBM: libopenlibm
  LLVM: libLLVM-12.0.1 (ORCJIT, tigerlake)

Thanks,

NB: It's the first time I'm posting an issue. Sorry if it's the wrong place. (Should it be in julia repo?)

[johnnychen94]

Looks like it's an ImageMagick issue and is specific to ImageMagick.

(@v1.7) pkg> activate --temp

(jl_LojMuo) pkg> add ImageMagick TestImages

julia> using TestImages, ImageMagick

julia> file = testimage("earth_apollo17"; download_only=true)
"/Users/jc/.julia/artifacts/e752bdc739f34d02e79c7fa834bc2f2e0d71c7e0/earth_apollo17.jpg"

julia> @time ImageMagick.load(file);
  4.090564 seconds (110.18 M allocations: 3.807 GiB, 9.25% gc time, 13.21% compilation time)

QuartzImageIO on macOS works "normally" here:

julia> using QuartzImageIO

julia> @time QuartzImageIO.load(file);
  0.468937 seconds (61 allocations: 68.716 MiB, 5.63% gc time)

So we need someone with the expertise to bring a Julia wrapper for JpegTurbo; I'm interested in this but I don't have much free time until Feb..

I'm moving this to Images so that more people notice this issue.

[originalsouth]

This would probably be a good starter https://github.com/stevengj/JpegTurbo.jl

[johnnychen94]

The last step now: JuliaRegistries/General#53821

[johnnychen94]

Closing this as JpegTurbo.jl is now available in ImageIO v0.6.1