ac_isend-method: A Rank Send (Nonblocking) an Object to the Other Rank

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

A Rank Send (Nonblocking) an Object to the Other Rank

Description

This method lets a rank send (nonblocking) a object to the other rank in the same communicator. The default return is NULL.

Usage

isend(x, rank.dest = .pbd_env$SPMD.CT$rank.dest,
      tag = .pbd_env$SPMD.CT$tag,
      comm = .pbd_env$SPMD.CT$comm,
      request = .pbd_env$SPMD.CT$request,
      check.type = .pbd_env$SPMD.CT$check.type)

Arguments

x	an object to be sent from a rank.
rank.dest	a rank of destination where x send to.
tag	a tag number.
comm	a communicator number.
request	a request number.
check.type	if checking data type first for handshaking.

Details

A corresponding recv() or irecv() should be evoked at the corresponding rank rank.dest.

See details of send() for the arugments check.type.

Value

A NULL is returned by default.

Methods

For calling spmd.isend.*():

signature(x = "ANY")

signature(x = "integer")

signature(x = "numeric")

signature(x = "raw")

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/

See Also

send(), recv(), irecv().

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){
  y <- isend(matrix(x, nrow = 1))
} else if(.comm.rank == 1){
  y <- recv()
}
comm.print(y, rank.print = 1)

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

## End(Not run)

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