[R] loading libraries on MPI cluster

[Uwe Ligges]

Michela Cameletti wrote:
> Dear R-users,
> we are using library(snow) for computation on a linux cluster with RMPI.
> We have a problem with clusterEvalQ: after launching clusterEvalQ it seems
> loading the required library on each node but if we type a function
> belonging to the loaded package R doesn't find it.
> 
>> library(snow)
> 
> # making cluster with 3 nodes
>> cl <- makeCluster(3, type = "MPI")
> Loading required package: Rmpi
>         3 slaves are spawned successfully. 0 failed.
> 
> #loading library abind on each node
>> clusterEvalQ(cl,library(abind))
> [[1]]
>  [1] "abind"     "EMsspir"   "mvtnorm"   "MASS"      "snow"      "Rmpi"
>  [7] "methods"   "stats"     "graphics"  "grDevices" "utils"     "datasets"
> [13] "base"
> 
> [[2]]
>  [1] "abind"     "EMsspir"   "mvtnorm"   "MASS"      "snow"      "Rmpi"
>  [7] "methods"   "stats"     "graphics"  "grDevices" "utils"     "datasets"
> [13] "base"
> 
> [[3]]
>  [1] "abind"     "EMsspir"   "mvtnorm"   "MASS"      "snow"      "Rmpi"
>  [7] "methods"   "stats"     "graphics"  "grDevices" "utils"     "datasets"
> [13] "base"
> 
> #searching for function "abind" belonging to library "abind"
>> abind
> Error: object "abind" not found
>
> Is it possible to know which libraries each node has loaded?

clusterEvalQ(cl,library())


You have loaded the ***package*** on the nodes, but not in your session 
directly!

Uwe Ligges


> Thank you very much
> best regards
> Michela and Marco
> 
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