Differences between @spawnat, remotecall_wait, remotecall_fetch

Specific Domains Julia at Scale
,
1

Hello!

I was wondering what is the difference between @spawn, remotecall_wait and remotecall_fetch. For instance, consider the following MWE:

using Distributed
@everywhere using DistributedArrays

@everywhere function foo(v::Array)
    v .= myid()
    return
end

@everywhere function foo(v::DArray)
    return foo(localpart(v))
end

function main()
    v = dzeros((10,), workers(), nworkers())
    @time @sync begin
        for p in procs(v)
            # @async remotecall_wait(foo, p, v)
            # @async remotecall_fetch(foo, p, v)
            @spawnat p foo(v)
        end
    end
    println(v)
    return
end

main()

I run the script saved in the file testDistributedArrays.jl with: julia -p 4 testDistributedArrays.jl

All the three commands return the same vector. What is the difference between them? What am I missing?

Thank you very much