1

同じ機能を複数の独立したオブジェクトに適用していますが、並行して実行したいと考えています。問題は、関数がその引数の 1 つを変更することです。これはマップでは問題ありませんが、pmap では問題ありません。最小限の再現可能な例を次に示します。

@everywhere function testmod!(a,μ)
    for i=1:length(a)
        a[i]=i*μ
    end
    b=copy(a)
    return b
end

myarrays=[zeros(Float64,10) for i=1:10]
pmap((a1,a2)->testmod!(a1,a2),myarrays,[i for i=1:10])

このおもちゃの関数は、入力配列 a の要素を変更します。map と pmap の結果を比較します。

地図

julia> myarrays=[zeros(Float64,10) for i=1:10]
10-element Array{Array{Float64,1},1}:
 [0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0]
 [0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0]
 [0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0]
 [0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0]
 [0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0]
 [0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0]
 [0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0]
 [0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0]
 [0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0]
 [0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0]

julia> map((a1,a2)->testmod!(a1,a2),myarrays,[i for i=1:10])
10-element Array{Array{Float64,1},1}:
 [1.0,2.0,3.0,4.0,5.0,6.0,7.0,8.0,9.0,10.0]          
 [2.0,4.0,6.0,8.0,10.0,12.0,14.0,16.0,18.0,20.0]     
 [3.0,6.0,9.0,12.0,15.0,18.0,21.0,24.0,27.0,30.0]    
 [4.0,8.0,12.0,16.0,20.0,24.0,28.0,32.0,36.0,40.0]   
 [5.0,10.0,15.0,20.0,25.0,30.0,35.0,40.0,45.0,50.0]  
 [6.0,12.0,18.0,24.0,30.0,36.0,42.0,48.0,54.0,60.0]  
 [7.0,14.0,21.0,28.0,35.0,42.0,49.0,56.0,63.0,70.0]  
 [8.0,16.0,24.0,32.0,40.0,48.0,56.0,64.0,72.0,80.0]  
 [9.0,18.0,27.0,36.0,45.0,54.0,63.0,72.0,81.0,90.0]  
 [10.0,20.0,30.0,40.0,50.0,60.0,70.0,80.0,90.0,100.0]

julia> myarrays
10-element Array{Array{Float64,1},1}:
 [1.0,2.0,3.0,4.0,5.0,6.0,7.0,8.0,9.0,10.0]          
 [2.0,4.0,6.0,8.0,10.0,12.0,14.0,16.0,18.0,20.0]     
 [3.0,6.0,9.0,12.0,15.0,18.0,21.0,24.0,27.0,30.0]    
 [4.0,8.0,12.0,16.0,20.0,24.0,28.0,32.0,36.0,40.0]   
 [5.0,10.0,15.0,20.0,25.0,30.0,35.0,40.0,45.0,50.0]  
 [6.0,12.0,18.0,24.0,30.0,36.0,42.0,48.0,54.0,60.0]  
 [7.0,14.0,21.0,28.0,35.0,42.0,49.0,56.0,63.0,70.0]  
 [8.0,16.0,24.0,32.0,40.0,48.0,56.0,64.0,72.0,80.0]  
 [9.0,18.0,27.0,36.0,45.0,54.0,63.0,72.0,81.0,90.0]  
 [10.0,20.0,30.0,40.0,50.0,60.0,70.0,80.0,90.0,100.0]

これは希望どおりに機能します。対照的に、pmap:

pmap

julia> myarrays=[zeros(Float64,10) for i=1:10]
10-element Array{Array{Float64,1},1}:
 [0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0]
 [0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0]
 [0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0]
 [0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0]
 [0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0]
 [0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0]
 [0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0]
 [0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0]
 [0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0]
 [0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0]

julia> pmap((a1,a2)->testmod!(a1,a2),myarrays,[i for i=1:10])
10-element Array{Any,1}:
 [1.0,2.0,3.0,4.0,5.0,6.0,7.0,8.0,9.0,10.0]          
 [2.0,4.0,6.0,8.0,10.0,12.0,14.0,16.0,18.0,20.0]     
 [3.0,6.0,9.0,12.0,15.0,18.0,21.0,24.0,27.0,30.0]    
 [4.0,8.0,12.0,16.0,20.0,24.0,28.0,32.0,36.0,40.0]   
 [5.0,10.0,15.0,20.0,25.0,30.0,35.0,40.0,45.0,50.0]  
 [6.0,12.0,18.0,24.0,30.0,36.0,42.0,48.0,54.0,60.0]  
 [7.0,14.0,21.0,28.0,35.0,42.0,49.0,56.0,63.0,70.0]  
 [8.0,16.0,24.0,32.0,40.0,48.0,56.0,64.0,72.0,80.0]  
 [9.0,18.0,27.0,36.0,45.0,54.0,63.0,72.0,81.0,90.0]  
 [10.0,20.0,30.0,40.0,50.0,60.0,70.0,80.0,90.0,100.0]

julia> myarrays
10-element Array{Array{Float64,1},1}:
 [0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0]
 [0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0]
 [0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0]
 [0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0]
 [0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0]
 [0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0]
 [0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0]
 [0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0]
 [0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0]
 [0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0,0.0]

明らかに myarray は変更されていません。pmapでこれを達成する方法はありますか、またはpmapでのみ返すことができますか?

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