Jeroen/Tomas,
Thanks for the additional follow-ups. As shown in my original post, I am on
macOS 10.12.6. I was using the command line version of R to get the error
message I sent; I also get similar problems when running via GUI tools such
as RStudio. I have co-workers who are only using macOS and
Thanks for the warning about fork without exec(). A co-worker of mine, also
on Mac, ran the sample code and got an error about that exact problem.
Thanks also for the pointer to try curl::multi_add() or download.file()
with a vector of files.
My actual use case includes downloading the files and
I have an lapply function call that I want to parallelize. Below is a very
simplified version of the code:
url_base <- "https://cloud.r-project.org/src/contrib/";
files <- c("A3_1.0.0.tar.gz", "ABC.RAP_0.9.0.tar.gz")
res <- parallel::mclapply(files, function(s) download.file(paste0(url_base,
s), s
