Yakir Luc Gagnon (Dec 15 2021 at 09:08): Yakir Luc Gagnon (Dec 15 2021 at 09:08):I've recently noticed a significant slow down in loading images. This is hard to MWE because it depends on the image and the machine in question, but does this sound right to you:
(tmp) pkg> status
Status `~/tmp/Project.toml`
[5789e2e9] FileIO v1.11.2
[6218d12a] ImageMagick v1.2.2
julia> versioninfo()
Julia Version 1.7.0
Commit 3bf9d17731 (2021-11-30 12:12 UTC)
Platform Info:
OS: Linux (x86_64-linux-gnu)
CPU: AMD Ryzen Threadripper 2950X 16-Core Processor
WORD_SIZE: 64
LIBM: libopenlibm
LLVM: libLLVM-12.0.1 (ORCJIT, znver1)
julia> img = load(file);
julia> size(img)
(1440, 2560)
julia> filesize(file)
636254
julia> @btime load(file);
1.307 s (44236893 allocations: 1.51 GiB)
Should a 1440x2560 pixels 600 KB image take 1.3 seconds to load?
Andrey Oskin (Dec 15 2021 at 09:16):It doesn't sound right
Andrey Oskin (Dec 15 2021 at 09:17):What is file here?
Andrey Oskin (Dec 15 2021 at 09:18):Some IO object?
Yakir Luc Gagnon (Dec 15 2021 at 09:23):No, file is just the string of the path to the image file (a jpg). I can upload an image so we all use the same exact file, but it's arbitrary, I get this kind of performance no matter what image file I use.
Sukera (Dec 15 2021 at 09:56):where is the image loaded from? is it on an NFS?
Yakir Luc Gagnon (Dec 15 2021 at 12:05):No no, it's just an image file on my hard-disk (HDD).
I've built a MWE to clarify my previous example:
using FileIO, Colors
img = rand(RGB, 1440, 2560)
file = "img.jpg"
save(file, img)
using BenchmarkTools
filesize(file) # 6422686 bytes
@btime load(file); # 1.478 s (44236892 allocations: 1.51 GiB)
That takes at most 200 ms on my laptop
Yakir Luc Gagnon (Dec 15 2021 at 14:54):So strange: I tried using ProfileView like this:
using ProfileView
using FileIO
file = "img.jpg"
function profile_test(n)
for _ in 1:n
load(file)
end
end
@profview profile_test(1)
but it just stalled, got stuck, forever, which is weird in and of itself...
But this:
using ProfileView
using FileIO
file = "img.jpg"
load(file);
@profview load(file)
resulted in
screenshot_2021-12-15_154550.jpg
where the long green bar is wait in task.jl.
I have attached the jlprof file as well, if you want to take a look with:
julia> using ProfileView
julia> ProfileView.view(nothing)
and then press the load button and choose the attached
load_image.jlprof.
Jakob Nybo Nissen (Dec 15 2021 at 15:55):Is it possible that it's spending all the time waiting for the underlying JPEG library, which perhaps uses a slow fallback on your system?
Jakob Nybo Nissen (Dec 15 2021 at 15:56):Perhaps try reinstalling ImageMagick or whatever backend your FileIO uses for JPEG
Yakir Luc Gagnon (Dec 15 2021 at 21:07):I mean, whenever I try to load an (specifically jpg) image I get:
ArgumentError: Package ImageMagick [6218d12a-5da1-5696-b52f-db25d2ecc6d1] is required but does not seem to be installed:
- Run `Pkg.instantiate()` to install all recorded dependencies.
So I add ImageMagick, that's why the environment I have in my MWE includes ImageMagick:
(tmp) pkg> st
Status `~/tmp/Project.toml`
[5ae59095] Colors v0.12.8
[5789e2e9] FileIO v1.11.2
[6218d12a] ImageMagick v1.2.2
which is the latest version. So I'm not sure what else I could be doing?
Yakir Luc Gagnon (Dec 15 2021 at 21:13):I just tested my MWE on my home laptop, and .. I got the same slow down!
julia> @btime load(file);
3.459 s (44236892 allocations: 1.51 GiB)
What is going on...?!
Jakob Nybo Nissen (Dec 16 2021 at 05:47):Not sure - I used a different MacOS only backend to check
Yakir Luc Gagnon (Dec 16 2021 at 06:35):I'll open an issue...
Gerhard Aigner (Dec 16 2021 at 07:37):I reproduced it on 1.7 - it doesn't happen on 1.6...
Gerhard Aigner (Dec 16 2021 at 07:39):It has already been reported:
https://github.com/JuliaIO/ImageMagick.jl/issues/208
Last updated: Oct 02 2023 at 04:34 UTC