Performance of OffsetArrays

General Usage
5

This is an old thread, but I’m pleased to report new information. On an up-to-the moment copy of Julia 0.7 (you need https://github.com/JuliaLang/julia/pull/24899 and a few others, also the new optimizer probably helps) and Introduce full support for array operations by timholy · Pull Request #52 · JuliaArrays/OffsetArrays.jl · GitHub, the performance gap (on my machine) is no longer present. Indeed, for reasons I don’t fully understand the OffsetArray version seems consistently a bit faster:

julia> @btime lap2o($ox,$oy)
  2.365 ms (0 allocations: 0 bytes)                                                                                                                                                          
                                                                                                                                                                                             
julia> @btime lap2($x,$y)
  2.588 ms (0 allocations: 0 bytes)                                                                                                                                                          
                                                                                                                                                                                             
julia> @btime lap2o($ox,$oy)
  2.372 ms (0 allocations: 0 bytes)                                                                                                                                                          
                                                                                                                                                                                             
julia> @btime lap2($x,$y)
  2.593 ms (0 allocations: 0 bytes)
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