10x slowdown for creating DArray since 0.4

[andreasnoack]

I checked out version 0.2.0 of the package to make it more comparable. Using four processors on my laptop. This is probably an issue in base but will keep an issue here until we have isolated the issue in base since it has quite big impact on the usability of this package.

cc: @amitmurthy

Julia 0.4

julia> @time DArray(I -> Array{Float64}(map(length,I)), (1000,1000));
  0.005953 seconds (1.79 k allocations: 151.328 KB)

julia> @time DArray(I -> Array{Float64}(map(length,I)), (1000,1000));
  0.005756 seconds (1.68 k allocations: 144.516 KB)

Julia 0.5

julia> @time DArray(I -> Array{Float64}(map(length,I)), (1000,1000));
  0.059640 seconds (17.54 k allocations: 792.458 KB)

julia> @time DArray(I -> Array{Float64}(map(length,I)), (1000,1000));
  0.053510 seconds (17.09 k allocations: 770.286 KB)

[andreasnoack]

See explanation in JuliaLang/julia#19838