Slow with large images

[chrstphrbrns]

imshow takes more than two minutes to show a 12000x5000 image, and ~40 seconds to show a 5120x2880 image

Here's the data type for the first image (both were loaded using TiffImages

5000×12000 TiffImages.DenseTaggedImage{ColorTypes.RGB{FixedPointNumbers.N0f8}, 2, UInt32, Matrix{ColorTypes.RGB{FixedPointNumbers.N0f8}}}

julia> versioninfo()
Julia Version 1.11.0-DEV.586
Commit e9d633f70a* (2023-10-01 18:36 UTC)
Platform Info:
  OS: Linux (x86_64-linux-gnu)
  CPU: 32 × AMD Ryzen 9 3950X 16-Core Processor
  WORD_SIZE: 64
  LLVM: libLLVM-15.0.7 (ORCJIT, znver2)
  Threads: 47 on 32 virtual cores
Environment:
  LD_PRELOAD = /lib/x86_64-linux-gnu/libc_malloc_debug.so.0
  JULIA_NUM_THREADS = 32
  JULIA_EDITOR = vim

[chrstphrbrns]

Just discovered that ctrl-c will get the image on screen fast, so whatever it's doing for two minutes is apparently not essential

ulia> imshow(TiffImages.load("image.tif"))
Dict{String, Any} with 4 entries:^CError showing value of type Dict{String, Any}:
ERROR: InterruptException:
Stacktrace:
  [1] writeshortest(buf::Vector{…}, pos::Int64, x::Float64, plus::Bool, space::Bool, hash::Bool, precision::Int64, expchar::UInt8, padexp::Bool, decchar::UInt8, typed::Bool, compact::Bool)
    @ Base.Ryu ./ryu/shortest.jl:227
  [2] show(io::IOContext{IOBuffer}, x::Float64, forceuntyped::Bool, fromprint::Bool)
    @ Base.Ryu ./ryu/Ryu.jl:116
  [3] show(io::IO, x::T, forceuntyped::Bool, fromprint::Bool) where T<:Union{Float16, Float32, Float64}
    @ Base.Ryu ./ryu/Ryu.jl:113 [inlined]
  [4] show(io::IOContext{IOBuffer}, x::FixedPointNumbers.N0f8)
    @ FixedPointNumbers ~/.julia/packages/FixedPointNumbers/HAGk2/src/FixedPointNumbers.jl:274
  [5] _show_components(io::IOContext{IOBuffer}, c::ColorTypes.RGB{FixedPointNumbers.N0f8})
    @ ColorTypes ~/.julia/packages/ColorTypes/1dGw6/src/show.jl:21
  [6] show(io::IOContext{IOBuffer}, c::ColorTypes.RGB{FixedPointNumbers.N0f8})
    @ ColorTypes ~/.julia/packages/ColorTypes/1dGw6/src/show.jl:13
  [7] _show_nonempty(io::IOContext{IOBuffer}, X::AbstractMatrix, prefix::String, drop_brackets::Bool, axs::Tuple{Base.OneTo{Int64}, Base.OneTo{Int64}})
    @ Base ./arrayshow.jl:445
  [8] _show_nonempty(io::IOContext{IOBuffer}, X::MappedArrays.ReadonlyMappedArray{ColorTypes.RGB{…}, 2, SubArray{…}, ImageView.var"#74#75"{…}}, prefix::String)
    @ Base ./arrayshow.jl:413
  [9] show
    @ ./arrayshow.jl:491 [inlined]

[ashwani-rathee]

We are aware of the issue @chrstphrbrns or something similar, this comes from GTK and is supposed to be fixed in the new release.

[mkitti]

What is the issue, @ashwani-rathee ?

[jwahlstrand]

This doesn't look like the GTK issue. From the stacktrace it looks like it's taking forever to show() something in the output. Does calling imshow with a semicolon at the end speed it up?

[chrstphrbrns]

This doesn't look like the GTK issue. From the stacktrace it looks like it's taking forever to show() something in the output. Does calling imshow with a semicolon at the end speed it up?

Yes