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Can IJulia Jupyter/Pluto run on Linux without JULIA_COPY_STACKS=1? #145
Description
Hey,
in the REPL it is possible to run a JavaCall dependent library (like View5D) without JULIA_COPY_STACKS=1.
In IJulia or Pluto it is not:
JavaCall.JavaCallError("Either the environmental variable JULIA_COPY_STACKS must be 1 OR JavaCall must be used on the root Task.")
Stacktrace:
[1] assertroottask_or_goodenv
@ ~/.julia/packages/JavaCall/tjlYt/src/jvm.jl:236 [inlined]
[2] _init(opts::Vector{String})
@ JavaCall ~/.julia/packages/JavaCall/tjlYt/src/jvm.jl:285
[3] init()
@ JavaCall ~/.julia/packages/JavaCall/tjlYt/src/jvm.jl:277
[4] view5d(data::Matrix{Float64}, viewer::Nothing; gamma::Nothing, mode::DisplayMode, element::Int64, time::Int64, show_phase::Bool, keep_zero::Bool, name::Nothing, title::Nothing, properties::Nothing)
@ View5D ~/.julia/packages/View5D/cKswI/src/View5D.jl:1023
[5] view5d (repeats 2 times)
@ ~/.julia/packages/View5D/cKswI/src/View5D.jl:1021 [inlined]
[6] top-level scope
@ In[5]:1
[7] eval
@ ./boot.jl:360 [inlined]
[8] include_string(mapexpr::typeof(REPL.softscope), mod::Module, code::String, filename::String)
@ Base ./loading.jl:1094Some libraries, like FFTW.jl, crash when JULIA_COPY_STACKS=1 which is unfortunately a deal breaker for my applications.
Can we resolve this situation?
Thanks,
Felix
Activity
[-]Can IJulia Jupyter/Pluto run on Linux without `JULIA_COPY_STACKS=1`?[/-][+]Can IJulia Jupyter/Pluto run on Linux without JULIA_COPY_STACKS=1?[/+]mkitti commentedon May 14, 2021
The only other way is for JavaCall to run on the root
Task. You can check if you are on the root task by comparingBase.roottaskwithBase.current_task():If you can first start JavaCall on the root task, then you can use something like https://github.com/mkitti/TaskWorkers.jl to run a server task on the root Task to talk to Java.
Another way to do that is to have two Julia processes. One uses JavaCall while the other runs the notebook. You invoke Java commands by communicating between the two Julia proceses using something like
RemoteChannel. At this point though, maybe using something like ZeroMQ via ZMQ.jl makes more sense.mkitti commentedon May 14, 2021
Looking at IJulia, what you probably would need to do is create a custom kernel.jl which loads JavaCall and TaskWorkers, and then runs
@async IJulia.waitloop()just before starting the worker.https://github.com/JuliaLang/IJulia.jl/blob/cc2a9bf61a2515596b177339f9a3514de8c38573/src/kernel.jl
roflmaostc commentedon May 16, 2021
Hm looks tricky 😕
But would it be possible that View5D could manage the TaskWorkers.jl stuff to ensure that when it is called from within Pluto it calls the root task?
mkitti commentedon May 17, 2021
mkitti commentedon May 26, 2021
I'm checking in to see if you made any progress on this.
roflmaostc commentedon May 27, 2021
Sorry, I haven't really tried to solve this.
Maybe @RainerHeintzmann wants to tackle this 😄