library(future)
library(foreach)
ncores <- 3
cl <- parallel::makeCluster(3)
avail <- bigstatsr::FBM(ncores, 1, type = "integer", init = 1)
doFuture::registerDoFuture()
res <- vector("list", 5)
for (i in seq_along(res)) {
while (sum(avail[]) == 0) {
cat("Waiting..\n")
Sys.sleep(0.5)
}
ind.avail <- which(avail[] == 1)
cat("Available:", length(ind.avail), "\n")
plan(cluster, workers = cl[ind.avail])
foo <- foreach(i = 3:1) %dopar% {
Sys.sleep(i)
}
print(one <- ind.avail[1])
avail[one] <- FALSE; print(avail[])
res[[i]] <- cluster(workers = cl[one], {
Sys.sleep(5)
avail[one] <- TRUE
i
})
}
sapply(res, resolved)
parallel::stopCluster(cl)
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