pbdMPI (version 0.5-2)

wait: Wait Functions

Description

The functions call MPI wait functions.

Usage

wait(request = .pbd_env$SPMD.CT$request,
     status = .pbd_env$SPMD.CT$status)
waitany(count, status = .pbd_env$SPMD.CT$status)
waitsome(count)
waitall(count)

Value

An invisible state of MPI call is returned.

Arguments

request

a request number.

status

a status number.

count

a count number.

Author

Wei-Chen Chen , George Ostrouchov, Drew Schmidt, Pragneshkumar Patel, and Hao Yu.

Details

These functions are for internal uses. Potentially, they wait after some nonblocking MPI calls.

References

Programming with Big Data in R Website: https://pbdr.org/

Examples

if (FALSE) {
### Save code in a file "demo.r" and run with 2 processors by
### SHELL> mpiexec -np 2 Rscript demo.r

spmd.code <- "
### Initialize
suppressMessages(library(pbdMPI, quietly = TRUE))
.comm.size <- comm.size()
.comm.rank <- comm.rank()

### Examples.
N <- 5
x <- (1:N) + N * .comm.rank
if(.comm.rank == 0){
  isend(list(x))
}
if(.comm.rank == 1){
  y <- irecv(list(x))
}
wait()
comm.print(y, rank.print = 1L)

### Finish.
finalize()
"
# execmpi(spmd.code, nranks = 2L)
}