R Under development (unstable) (2024-02-28 r85999 ucrt) -- "Unsuffered Consequences"
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> source("incl/start.R")
> 
> library(parallel)

Attaching package: 'parallel'

The following object is masked _by_ '.GlobalEnv':

    detectCores

> 
> message("*** makeClusterMPI() ...")
*** makeClusterMPI() ...
> 
> pkg <- "Rmpi"
> if (fullTest && requireNamespace(pkg, quietly = TRUE)) {
+   cl <- makeClusterMPI(2L)
+   str(cl)
+   
+   res <- parLapply(cl, X = 1:2, fun = function(x) {
+     list(
+       hostname = Sys.info()[["nodename"]],
+       pid      = Sys.getpid(),
+       value    = x^2
+     )
+   })
+   utils::str(res)
+   y <- vapply(res, FUN = `[[`, "value", FUN.VALUE = NA_real_)
+   stopifnot(identical(y, c(1, 4)))
+ 
+   stopCluster(cl)
+   str(cl)
+ }
> 
> message("*** makeClusterMPI() ... DONE")
*** makeClusterMPI() ... DONE
> 
> source("incl/end.R")
> 
> proc.time()
   user  system elapsed 
   0.23    0.04    0.26