Why doesn't this do what I think it should:
benjamin@benjamin-VirtualBox:~$ julia -p 3
julia> @everywhere(function foom(bar::Vector{Any}, k::Integer) println(repeat(bar[2],bar[1])); return bar; end)
julia> foo={{1,"a"},{2,"b"},{3,"c"}}
julia> pmap(foom, foo, 5)
From worker 2: a
1-element Array{Any,1}:
{1,"a"}
and that is all it outputs. I was expecting pmap to iterate through each tuple in foo and call foom on it.
EDIT:
It works correctly when I don't pass other arguments in:
julia> @everywhere(function foom(bar::Vector{Any}) println(repeat(bar[2],bar[1])); return bar; end)
julia> pmap(foom, foo)
From worker 3: bb
From worker 2: a
From worker 4: ccc
3-element Array{Any,1}:
{1,"a"}
{2,"b"}
{3,"c"}
How can I pass in more arguments to pmap?
The function pmap does take any number of arguments each one a collection
function pmap(f, lsts...; err_retry=true, err_stop=false)
The function f will be sent an argument for each collection
Example Multi-argument Function
julia> @everywhere f(s,count)=(println("process id = $(myid()) s = $s count = $count");repeat(s,count))
pmap use 1
julia> pmap((a1,a2)->f(a1,a2),{"a","b","c"},{2,1,3})
From worker 3: process id = 3 s = b count = 1
From worker 2: process id = 2 s = a count = 2
From worker 4: process id = 4 s = c count = 3
3-element Array{Any,1}:
"aa"
"b"
"ccc"
pmap use 2
Alternately, arguments can be sent as collection of arguments from one outer collection which can be spatted into multiple arguments for the target function
julia> pmap((args)->f(args...),{{"a",2},{"b",1},{"c",3}})
From worker 2: process id = 2 s = a count = 2
From worker 3: process id = 3 s = b count = 1
From worker 4: process id = 4 s = c count = 3
3-element Array{Any,1}:
"aa"
"b"
"ccc"