打包batchtools和parallelMap

Question

我正在学习如何使用batchtools package，但是有些事情我不太了解，如何使用parallelMap或doParallel建立链接/连接？

library(batchtools)
library(parallelMap)

tmp = makeRegistry(file.dir = NA, make.default = FALSE)
f = function(i) {
  parallelMap::parallelMap(Sys.sleep, rep(10, i))
}
ids = batchMap(f, i = 4, reg = tmp)
res = list(pm.backend = "multicore", ncpus = 4)

parallelStart()
...
parallelStop()