[R] Warning messages while parallel computing

[Jiefei Wang]

Hi Shah,

The error usually means you started a cluster and forgot to close it. From
the code you post, I cannot see any problem. Maybe you run `makeCluster`
twice by accident?

Best,
Jiefei

On Thu, Mar 4, 2021 at 5:53 PM Shah Alam <dr.alamsolangi using gmail.com> wrote:

> Hello everyone,
>
> I am using the "parallel" R package for parallel computation.
>
> Code:
>
>    # set number of cores
>     cl <- makeCluster(8, type = "PSOCK")  # Mac/Linux need to set as "FORK"
>
>       # pass functions and objects to the cluster environment and set seed
>       # all the items exported need to stay in the global environment!!
>       clusterCall(cl, function() { source("xx.R" )})
>       clusterExport(cl, list("a", "b", "c", "d",
>                              "5"))
>       clusterSetRNGStream(cl, 1)
>
> While parallel processing, I receive the following warning signs.  Do I
> need to ignore these signs or do they potentially slow the whole process?
>
>  *  Warning signs:*
> Warning in for (i in seq_len(Ne + echo)) { :
>   closing unused connection 19
> Warning in for (i in seq_len(Ne + echo)) { :
>   closing unused connection 18
> Warning in for (i in seq_len(Ne + echo)) { :
>   closing unused connection 17
> Warning in for (i in seq_len(Ne + echo)) { :
>   closing unused connection 16
> Warning in for (i in seq_len(Ne + echo)) { :
>   closing unused connection 15
> Warning in for (i in seq_len(Ne + echo)) { :
>   closing unused connection 14
> Warning in for (i in seq_len(Ne + echo)) { :
>   closing unused connection 13
> Warning in for (i in seq_len(Ne + echo)) { :
>   closing unused connection 12
>
> Best regards,
> Shah Alam
>
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>
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