inst/examples/test_send_recv/03_lazy.r

In RBigData/pbdMPI: R Interface to MPI for HPC Clusters (Programming with Big Data Project)

### SHELL> mpiexec -np 4 Rscript --vanilla [...].r

suppressMessages(library(pbdMPI, quietly = TRUE))
.comm.size <- comm.size()
.comm.rank <- comm.rank()

N <- 5
x <- (1:N) + N * .comm.rank

if(.comm.rank == 0){
  send(list(x))
} else if(.comm.rank == 1){
  y <- recv()
}
comm.print(y, rank.print = 1)

if(.comm.rank == 0){
  send(as.integer(x), rank.dest = 2)
} else if(.comm.rank == 2){
  y <- recv()
}
comm.print(y, rank.print = 2)

if(.comm.rank == 0){
  send(as.double(x), rank.dest = 3)
} else if(.comm.rank == 3){
  y <- recv()
}
comm.print(y, rank.print = 3)

xx <- as.raw(x)
comm.print(xx, rank.print = 0)
if(.comm.rank == 0){
  send(xx, rank.dest = 2)
} else if(.comm.rank == 2){
  y <- recv()
}
comm.print(y, rank.print = 2)

if(.comm.rank == 0){
  send(xx, rank.dest = 3)
} else if(.comm.rank == 3){
  y <- recv(xx)
}
comm.print(y, rank.print = 3)

xx <- serialize(list(x), NULL)
comm.print(xx, rank.print = 0)
if(.comm.rank == 0){
  send(xx, rank.dest = 1)
} else if(.comm.rank == 1){
  y <- recv()
}
comm.print(unserialize(y), rank.print = 1)

finalize()