dd_wait: Wait Functions

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

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)

Arguments

request	a request number.
status	a status number.
count	a count number.

Details

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

Value

An invisible state of MPI call is returned.

Author(s)

Wei-Chen Chen [e-mail], George Ostrouchov, Drew Schmidt, Pragneshkumar Patel, and Hao Yu.

References

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

Examples

## Not run: 
### 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)

## End(Not run)

pbdMPI documentation built on Sept. 18, 2024, 9:07 a.m.