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# Untitled

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1. #pmapdemo.jl
2. using Distributed
3. #addprocs(length(Sys.cpu_info())) # uncomment this line for error
4. @everywhere include(joinpath(@__DIR__, "pmapdemo2.jl"))
5.
6. function main()
7.     # Get source data
8.     source = Dict{String, Any}("t"=>zeros(5),
9.                                "x"=>zeros(5,6),
10.                                "y"=>zeros(5,3),
11.                                "z"=>zeros(5,3))
12.     # Define set of points over which to iterate
13.     iterset = Dict{String, Any}("t"=>source["t"],
14.                                 "x"=>source["x"],
15.                                 "y"=>fill(2, size(source["t"])[1], 1),
16.                                 "z"=>fill(2, size(source["t"])[1], 1))
17.     data = Dict{String, Any}()
18.
19.     # Initialise array points to be calculated
20.     MyMod.initialisearray!(data, iterset)
21.     # Calculate each array point
22.     MyMod.calcarray!(data, iterset, source)
23.     @show data
24. end
25.
26. main()
27.
28. #pmapdemo2.jl
29. module MyMod
30.
31. using Distributed
32. @everywhere using SharedArrays
33.
34. # Initialise data array
35. function initialisearray!(data, fieldset)
36.     zerofield::SharedArray{Float64, 4} = zeros(size(fieldset["t"])[1],
37.                                                size(fieldset["x"])[2],
38.                                                size(fieldset["y"])[2],
39.                                                size(fieldset["z"])[2])
40.     data["field"] = deepcopy(zerofield)
41. end
42.
43. # Calculate values of array elements according to values in source
44. function calcpoint!((data, source, a, b, c, d))
45.     data["field"][a,b,c,d] = rand()
46. end
47.
48. # Set values in array
49. function calcarray!(data, iterset, source)
50.     for a in eachindex(iterset["t"])
51.         # [additional functionality f(a) here]
52.         b = eachindex(iterset["x"][a,:])
53.         c = eachindex(iterset["y"][a,:])
54.         d = eachindex(iterset["z"][a,:])
55.         pmap(calcpoint!, Iterators.product(Iterators.repeated(data,1), Iterators.repeated(source,1), Iterators.repeated(a,1), b, c, d))
56.     end
57. end
58.
59. end
60.
61. ERROR: LoadError: On worker 2:
62. BoundsError: attempt to access 0×0×0×0 Array{Float64,4} at index [1]
63. setindex! at ./array.jl:767 [inlined]
64. setindex! at /build/julia/src/julia-1.1.1/usr/share/julia/stdlib/v1.1/SharedArrays/src/SharedArrays.jl:500 [inlined]
65. _setindex! at ./abstractarray.jl:1043
66. setindex! at ./abstractarray.jl:1020
67. calcpoint! at /home/dave/pmapdemo2.jl:25
68. #112 at /build/julia/src/julia-1.1.1/usr/share/julia/stdlib/v1.1/Distributed/src/process_messages.jl:269
69. run_work_thunk at /build/julia/src/julia-1.1.1/usr/share/julia/stdlib/v1.1/Distributed/src/process_messages.jl:56
70. macro expansion at /build/julia/src/julia-1.1.1/usr/share/julia/stdlib/v1.1/Distributed/src/process_messages.jl:269 [inlined]
72. Stacktrace:
73.  [1] (::getfield(Base, Symbol("##696#698")))(::Task) at ./asyncmap.jl:178
74.  [2] foreach(::getfield(Base, Symbol("##696#698")), ::Array{Any,1}) at ./abstractarray.jl:1866
75.  [3] maptwice(::Function, ::Channel{Any}, ::Array{Any,1}, ::Base.Iterators.ProductIterator{Tuple{Base.Iterators.Take{Base.Iterators.Repeated{Dict{String,Any}}},Base.Iterators.Take{Base.Iterators.Repeated{Dict{String,Any}}},Base.Iterators.Take{Base.Iterators.Repeated{Int64}},Base.OneTo{Int64},Base.OneTo{Int64},Base.OneTo{Int64}}}) at ./asyncmap.jl:178
76.  [4] #async_usemap#681 at ./asyncmap.jl:154 [inlined]
77.  [5] #async_usemap at ./none:0 [inlined]
78.  [6] #asyncmap#680 at ./asyncmap.jl:81 [inlined]
79.  [7] #asyncmap at ./none:0 [inlined]
80.  [8] #pmap#213(::Bool, ::Int64, ::Nothing, ::Array{Any,1}, ::Nothing, ::Function, ::Function, ::WorkerPool, ::Base.Iterators.ProductIterator{Tuple{Base.Iterators.Take{Base.Iterators.Repeated{Dict{String,Any}}},Base.Iterators.Take{Base.Iterators.Repeated{Dict{String,Any}}},Base.Iterators.Take{Base.Iterators.Repeated{Int64}},Base.OneTo{Int64},Base.OneTo{Int64},Base.OneTo{Int64}}}) at /build/julia/src/julia-1.1.1/usr/share/julia/stdlib/v1.1/Distributed/src/pmap.jl:126
81.  [9] pmap(::Function, ::WorkerPool, ::Base.Iterators.ProductIterator{Tuple{Base.Iterators.Take{Base.Iterators.Repeated{Dict{String,Any}}},Base.Iterators.Take{Base.Iterators.Repeated{Dict{String,Any}}},Base.Iterators.Take{Base.Iterators.Repeated{Int64}},Base.OneTo{Int64},Base.OneTo{Int64},Base.OneTo{Int64}}}) at /build/julia/src/julia-1.1.1/usr/share/julia/stdlib/v1.1/Distributed/src/pmap.jl:101
82.  [10] #pmap#223(::Base.Iterators.Pairs{Union{},Union{},Tuple{},NamedTuple{(),Tuple{}}}, ::Function, ::Function, ::Base.Iterators.ProductIterator{Tuple{Base.Iterators.Take{Base.Iterators.Repeated{Dict{String,Any}}},Base.Iterators.Take{Base.Iterators.Repeated{Dict{String,Any}}},Base.Iterators.Take{Base.Iterators.Repeated{Int64}},Base.OneTo{Int64},Base.OneTo{Int64},Base.OneTo{Int64}}}) at /build/julia/src/julia-1.1.1/usr/share/julia/stdlib/v1.1/Distributed/src/pmap.jl:156
83.  [11] pmap(::Function, ::Base.Iterators.ProductIterator{Tuple{Base.Iterators.Take{Base.Iterators.Repeated{Dict{String,Any}}},Base.Iterators.Take{Base.Iterators.Repeated{Dict{String,Any}}},Base.Iterators.Take{Base.Iterators.Repeated{Int64}},Base.OneTo{Int64},Base.OneTo{Int64},Base.OneTo{Int64}}}) at /build/julia/src/julia-1.1.1/usr/share/julia/stdlib/v1.1/Distributed/src/pmap.jl:156
84.  [12] calcarray!(::Dict{String,Any}, ::Dict{String,Any}, ::Dict{String,Any}) at /home/dave/pmapdemo2.jl:20
85.  [13] main() at /home/dave/pmapdemo.jl:19
86.  [14] top-level scope at none:0
87. in expression starting at /home/dave/pmapdemo.jl:23
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