pbdMPI (version 0.2-3)

sourcetag: Functions to Obtain source and tag

Description

The functions extract MPI_ANY_SOURCE, MPI_ANY_TAG, MPI_status.source and MPI_status.tag.

Usage

anysource()
  anytag()
  get.sourcetag(status = .SPMD.CT$status)

Arguments

status

a status number.

Value

• Corresponding status will be returned.

Details

These functions are for internal uses.

References

Programming with Big Data in R Website: http://r-pbd.org/

Examples

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

### Initial.
library(pbdMPI, quietly = TRUE)
init()
.comm.size <- comm.size()
.comm.rank <- comm.rank()
if(.comm.size < 2)
  comm.stop("At least two processors are requried.")

### Examples.
if(.comm.rank != 0){
  send(as.integer(.comm.rank * 10), rank.dest = 0L,
       tag = as.integer(.comm.rank + 10))
}
if(.comm.rank == 0){
  for(i in 1:(.comm.size - 1)){
    ret <- recv(x.buffer = integer(1),
                rank.source = anysource(), tag = anytag())
    sourcetag <- get.sourcetag()
    print(c(sourcetag, ret))
  }
}

### Finish.
finalize()