World Age

[MikaelSlevinsky]

On version:

julia> versioninfo()
Julia Version 0.6.0-pre.alpha.220
Commit 89609cf* (2017-03-22 20:10 UTC)
Platform Info:
  OS: macOS (x86_64-apple-darwin16.4.0)
  CPU: Intel(R) Core(TM) i7-4980HQ CPU @ 2.80GHz
  WORD_SIZE: 64
  BLAS: libopenblas (USE64BITINT DYNAMIC_ARCH NO_AFFINITY Haswell)
  LAPACK: libopenblas64_
  LIBM: libopenlibm
  LLVM: libLLVM-3.9.1 (ORCJIT, haswell)

with master Interact and IJulia, I get a world age issue in IJulia:

using Interact
x = collect(linspace(-1,1,101))
f = sin.(10exp.(x));
@manipulate for i = 1:10
    i
end

5
KERNEL EXCEPTION
MethodError: no method matching (::##1#4)(::IJulia.Msg)
The applicable method may be too new: running in world age 21603, while current world is 21678.
Closest candidates are:
  #1(::Any) at /Users/Mikael/.julia/v0.6/Interact/src/IJulia/setup.jl:56 (method too new to be called from this world context.)

Stacktrace:
 [1] comm_msg(::ZMQ.Socket, ::IJulia.Msg) at /Users/Mikael/.julia/v0.6/IJulia/src/comm_manager.jl:135
 [2] eventloop(::ZMQ.Socket) at /Users/Mikael/.julia/v0.6/IJulia/src/eventloop.jl:8
 [3] (::IJulia.##9#12)() at ./task.jl:335

KERNEL EXCEPTION
MethodError: no method matching (::##1#4)(::IJulia.Msg)
The applicable method may be too new: running in world age 21603, while current world is 21678.
Closest candidates are:
  #1(::Any) at /Users/Mikael/.julia/v0.6/Interact/src/IJulia/setup.jl:56 (method too new to be called from this world context.)

Stacktrace:
 [1] comm_msg(::ZMQ.Socket, ::IJulia.Msg) at /Users/Mikael/.julia/v0.6/IJulia/src/comm_manager.jl:135
 [2] eventloop(::ZMQ.Socket) at /Users/Mikael/.julia/v0.6/IJulia/src/eventloop.jl:8
 [3] (::IJulia.##9#12)() at ./task.jl:335

KERNEL EXCEPTION
MethodError: no method matching (::##1#4)(::IJulia.Msg)
The applicable method may be too new: running in world age 21603, while current world is 21678.
Closest candidates are:
  #1(::Any) at /Users/Mikael/.julia/v0.6/Interact/src/IJulia/setup.jl:56 (method too new to be called from this world context.)

Stacktrace:
 [1] comm_msg(::ZMQ.Socket, ::IJulia.Msg) at /Users/Mikael/.julia/v0.6/IJulia/src/comm_manager.jl:135
 [2] eventloop(::ZMQ.Socket) at /Users/Mikael/.julia/v0.6/IJulia/src/eventloop.jl:8
 [3] (::IJulia.##9#12)() at ./task.jl:335

This is too cryptic for me to figure out; I'm not even sure if it's an Interact or IJulia issue.

[JobJob]

Hi, yeah a fix for this is coming soon, we're waiting on something in Base (more info here #158 (comment) if you're curious)

In the meantime I think you should be able to workaround this with the following changes:

Change this line in IJulia to eval(Expr(:call, handlers[msg.header["msg_type"]], socket, msg)), and this line in Reactive to isrequired(a) && eval(Expr(:call, a.f, a.recipient.value, timestep))

Let me know how it goes.

[JobJob]

Actually looking at the error you might also have to change this line to

eval(Expr(:call, comm.on_msg, msg))

[MikaelSlevinsky]

Thanks, the fix works! I only use Interact with plotting for demos, and it appears to have gotten a lot slower since July (on 0.4 then, 0.6 now). Any reason you can think of?

[JobJob]

Doing what exactly? moving sliders to update plots? Which plotting lib?

I've noticed the throttle on the number of updates for each move of the slider is working "better" as in the plot updates fewer times when you move the slider, but sometimes this makes things less smooth

[JobJob]

Glad it works btw, did you need to add the last part?

[timholy]

Probably fixed in JuliaLang/julia#20820 (worth testing).

[timholy]

Or perhaps not. See JuliaLang/julia#21141.

[SimonDanisch]

Yeah, still getting world age errors first time after precompilation.. but they seem to be gone after a restart... Still not tested very well from my side, though

[oschulz]

Any news on this? I just ran into this with Julia v0.6.0:

MethodError: no method matching (::##13#14{Interact.Options{:SelectionSlider,Float64}})(::IJulia.Msg)
The applicable method may be too new: running in world age [...]

[oschulz]

Restart didn't help, in my case.

[JobJob]

You might need to update IJulia

[JobJob]

Oh I think you need to Pkg.checkout("IJulia"), let me know how that goes.

[JobJob]

@stevengj if you get a chance to tag an IJulia release that would be great! Interact doesn't work on julia 0.6 without the invokelatest changes.

[shashi]

I've tagged it. @JobJob @timholy many thanks to you fine folks for taking care of this <3

[dpsanders]

Can confirm that Interact works on the release of 0.6 with IJulia master (tag waiting to be merged:
JuliaLang/METADATA.jl#9891). Thanks to all!

[JobJob]

Cheers, have fun at juliacon everyone!

[oschulz]

Works for me too now - thanks a lot, @JobJob and @shashi!