Error in makePSOCKcluster(names = spec, ...) : Cluster setup failed. 1 worker of 1 failed to connect.

[PeiwenLi]

Hi,
I am getting the same error message when using assign.MC() and assign.kfold():

assign.MC(GENEPOP391ind_3_realpop_imputed, train.inds=c(0.5), train.loci=c(0.001, 0.005, 0.05, 0.1, 0.25, 0.5, 1),
           loci.sample="fst", iterations=30, model="svm", dir="assignPOP_391_3_realpop_imputed_mc/")

The error message is:

Parallel computing is on. Analyzing data using 3 cores/threads of CPU...
Error in makePSOCKcluster(names = spec, ...) : 
  Cluster setup failed. 3 worker of 3 failed to connect.

I am using macOS 11.2.2 with R 4.0.2 and assignPOP 1.2.2. Is that something wrong with my operation system as it seems not able to use the 3 cores? I also tried with processors=1 but got the same error message.

Thank you for sharing the tool and thanks in advance for your help!

Sincerely,
Peiwen

[alexkychen]

Hi Peiwen,

I did a quick search for your error message. It seems like an issue between RStudio and the "parallel" library.
rstudio/rstudio#6692
Not sure if it has to do with your operating system, but I would try to set the argument "multiprocess=FALSE" in the function to turn off parallel computing (instead of using processors = 1) and see if it works.

Thanks.
Alex