R - 并行化错误，checkCluster(cl) - 不是有效的集群

Question

这段代码给我带来了一个错误： Error in checkCluster(cl): not a valid cluster

library(parallel)
numWorkers <-8

cl <-makeCluster(numWorkers, type="PSOCK")

   res.mat <- parLapply(1:10, function(x) my.fun(x))

stopCluster(cl)

如果没有并行化尝试，这完全可以正常工作：

res.mat <- lapply(1:10, function(x) my.fun(x))

这个例子也很有效：

workerFunc <- function(n){return(n^2)}

library(parallel)

numWorkers <-8

cl <-makeCluster(numWorkers, type ="PSOCK")

res <- parLapply(cl, 1:100, workerFunc)

stopCluster(cl)

print(unlist(res))

我该如何解决我的问题？

我发现例如

class(cl)
[1] "SOCKcluster" "cluster"  

cl 是：

cl
socket cluster with 8 nodes on host ‘localhost’

Answer 1

library(parallel)
numWorkers <- 8

cl <-makeCluster(numWorkers, type="PSOCK")

res.mat <- parLapply(cl,1:10, function(x) my.fun(x))

stopCluster(cl)