Update RecursiveArrayTools.jl compatibility to version 3

[huiyuxie]

Supplementary fix for #2150 and JoshuaLampert/DispersiveShallowWater.jl#163 (merged).

[github-actions]

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Created with ❤️ by the Trixi.jl community.

[huiyuxie]

I make the initialization algorithm for DiscreteCallback default to nothing - if that is not what you intend to change with the new struct, this PR definitely won't help.

[huiyuxie]

This will make the current package compatible with Julia >= 1.10 - the CI tests relates to Julia < 1.10 will definitely fail.

[huiyuxie]

The dependency management is really a mess here - for example, the configurations for test env, docs env, and main project env never align. This definitely makes the debug for env configuration hard

[huiyuxie]

Review @ranocha @sloede

[sloede]

This will make the current package compatible with Julia >= 1.10

I don't think we are ready to do this just yet - or did we make a decision about this that I forgot about, @ranocha?

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 84.37%. Comparing base (62e3584) to head (ca4bcd8).

Additional details and impacted files

@@             Coverage Diff             @@
##             main    #2194       +/-   ##
===========================================
+ Coverage   43.20%   84.37%   +41.17%     
===========================================
  Files         485      486        +1     
  Lines       39006    39148      +142     
===========================================
+ Hits        16852    33031    +16179     
+ Misses      22154     6117    -16037     

Flag	Coverage Δ
unittests	84.37% <ø> (+41.17%)	⬆️

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[huiyuxie]

Then the issue #1789 will be delayed - when do you plan to upgrade to Julia 1.10?

[sloede]

Then the issue #1789 will be delayed - when do you plan to upgrade to Julia 1.10?

Which version of RecursiveArrayTools.jl is really required? Just v3 (i.e., v3.0.0 would be sufficient) or a specific, later version? With, e.g., v3.2 we would still be able to keep Julia v1.9 compatibility.

[huiyuxie]

Good question 👍let me check

[huiyuxie]

Which version of RecursiveArrayTools.jl is really required?

I have no idea, I just know that >= 2.38.10 does not work and >= 3 works. Can you answer Michael's question @jlchan - I don't know which version you actually need

[ranocha]

I would hesitate to require Julia 1.10 and newer. We have seen some performance impacts in HPC settings, e.g., JuliaLang/julia#55009, JuliaLang/julia#50985

[jlchan]

Which version of RecursiveArrayTools.jl is really required?

I have no idea, I just know that >= 2.38.10 does not work and >= 3 works. Can you answer Michael's question @jlchan - I don't know which version you actually need

We'd need at least RecursiveArrayTools.jl 3.27.1, which is where @huiyuxie's PR fixing VectorOfArray was implemented.

[sloede]

Which version of RecursiveArrayTools.jl is really required?

I have no idea, I just know that >= 2.38.10 does not work and >= 3 works. Can you answer Michael's question @jlchan - I don't know which version you actually need

We'd need at least RecursiveArrayTools.jl 3.27.1, which is where @huiyuxie's PR fixing VectorOfArray was implemented.

Too bad. This is already at Julia v1.10 😞

[huiyuxie]

I would hesitate to require Julia 1.10 and newer. We have seen some performance impacts in HPC settings, e.g., JuliaLang/julia#55009, JuliaLang/julia#50985

Does it mean you prefer to upgrade to version 1.10 until both of these issues are resolved?

[ranocha]

That's something we need to discuss.

[JoshuaLampert]

This is a bad situation. IMHO, we cannot wait until these two issues are resolved before we fix the incompatibility with newer versions of the whole SciML stack. Fixing this feels more and more urgent and it also looks like the two julia issues will not be fixed anytime soon.
Is there any chance to keep the compat bound as v1.8 for julia, but also allow old and new versions of RecursiveArrayTools.jl (something like `RecursiveArrayTools = "2.38.10, 3")? Then one would need to implement different behavior depending on the version of RecursiveArrayTools.jl, i.e. for RecursiveArrayTools.jl < v3.27.1 we use the current version and for RecursiveArrayTools.jl >= v3.27.1 we implement the new version. In that case for julia < v1.10 the old version would be used and for julia >= v1.10 the new one. However, if that is really practically viable is another question. Do you see any major problem that rules this solution out?

[ranocha]

Thanks! I'll merge this PR when tests pass.

[ranocha]

This was quite a dependency nightmare. Let's see whether CI passes this time...

[ranocha]

There are some real CI failures, e.g., related to the signature of the ODE solution used for plotting: https://github.com/trixi-framework/Trixi.jl/actions/runs/12692326120/job/35377430185?pr=2194#step:7:1635

[ranocha]

It looks like there is some serious type instability or something like that with MPI (based on the amount of allocations): https://github.com/trixi-framework/Trixi.jl/actions/runs/12692326120/job/35377432752?pr=2194#step:7:12200

[ranocha]

I don't have the time to debug this further today. Any help is welcome 🙂

[jlchan]

I don't have the time to debug this further today. Any help is welcome 🙂

I can work on the plotting but it probably won't be until tomorrow.

[huiyuxie]

Thanks for helping @ranocha 😊