pbdMPI (version 0.5-2)

MPI array pointers: Set or Get MPI Array Pointers in R

Description

The function set/get a point address in R where the point point to a structure containing MPI arrays.

Usage

arrange.mpi.apts()

Value

`.__MPI_APTS__' is set in .GlobalEnv of R.

Author

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

Details

Since Rmpi/pbdMPI pre-allocate memory to store comm, status, datatype, info, request, this function provides a variable in R to let different APIs share the same memory address.

If the package loads first, then this sets `.__MPI_APTS__' in the .GlobalEnv of R. If the package does not load before other MPI APIs, then this gives a structure pointer to external memory according to `.__MPI_APTS__', i.e. allocated by other MPI APIs.

pbdMPI/R/arrange.mpi.apts provides the R code, and pbdMPI/src/pkg_*.* provides the details of this call.

References

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

Examples

if (FALSE) {
### See source code for the details.
}