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The following program is whittled down from a much larger program that always works on Intel, and always works on AMD's threadripper with lapply but not mclappy. With mclapply on AMD, all processes go into "suspend" mode and the program then hangs. This bug is replicable on an AMD Ryzen Threadripper 2950X 16-Core Processor (128GB RAM), running latest ubuntu 18.04. The R version

...s to 4 for parallel::mclapply I would try throttling data.table which in its current version goes for all cores. So do, say, setDTthreads(4) and see if that helps. Try lower and lower values to see if you get by. While there may well be a different race condition in mclapply, it may help to not overschedule. (FWIW, the next version of data.table, in queue at CRAN, is less aggressive and has additional options for fine tuning.) Dirk | if (!file.exists("bugsample.csv")) { | NR <- 64833330 | notused <- data.frame(v1=1:NR, v2=1:NR, v3=1:NR, x1=log(1:NR), | x2=log(1:NR)) | fw...

Guys All the recent discussions recently, and the knowledge of a 2.6 port, of WRR has made me very keen on trying it. I had a look at the docs and examples know but my mind is not in a very receptive state. Take this simple example. Incoming internet connection of 1mbps. Shared between up to 25 users simultaneously. I know that WRR can fairly distribute the traffic amongst the currently