[R] error with more 100 forked processes

[Guido Kraemer]

I am trying to run a parallel job on a computer with many CPUs and get 
the following error:

 > library(parallel)
 > cl <- makeForkCluster(128)
Error in UseMethod("sendData") :
   no applicable method for 'sendData' applied to an object of class "NULL"

If I scale down to 100 CPUs it doesn't produce an error. I can reproduce 
this with a self compiled R 4.1.3 on Ubuntu 20.04 and Manjaro, as well 
as the R binaries that come with both distributions.


-- 
Guido Kraemer
Max Planck Institute for Biogeochemistry Jena
Department for Biogeochemical Integration
Hans-Knöll-Str. 10
07745 Jena
Germany

phone: +49 3641 576293
e-mail: gkraemer using bgc-jena.mpg.de