我有许多冗长的工作,我想与 foreach-dopar 并行化,以便每个线程独立于其他线程工作。我想通过使用sink
. 以下显然不起作用;日志文件只有一个条目。
library(foreach)
library(doParallel)
library(doSNOW)
cl = makeCluster(2, type="SOCK")
registerDoSNOW(cl)
dl = file("runlog.Rout", open="wt")
sink(dl, type="output", append=TRUE)
sink(dl, type="message", append=TRUE)
dump <- foreach(i=1:5,
.errorhandling = "stop",
.verbose=TRUE) %dopar%
{
beg.time = Sys.time()
cat(as.character(beg.time), " I am running....\n", file="mylog.txt")
# do something here.....
end.time = Sys.time()
del.tm = difftime(end.time, beg.time, units="mins")
cat("....saving output to file......\n\n", file="mylog.txt")
save(del.tm, file = paste("I:/Rhome/H", i, ".RData", sep=""))
return(i)
}
stopCluster(cl)
sink(type="output")
sink(type="message")
日志文件只有一行:
....saving output to file......
什么地方出了错 ?