mpi.gather.Robj: Extentions of MPI\_Gather and MPI\_Allgather APIs

Description Usage Arguments Details Value Author(s) References See Also Examples

Description

mpi.gather.Robj gathers each member's object to the member specified by the argument root. The root member receives the objects as a list. mpi.allgather.Robj is the same as mpi.gather.Robj except that all members receive the result instead of just the root.

Usage

1
2
3
mpi.gather.Robj(obj=NULL, root = 0, comm = 1, ...)

mpi.allgather.Robj(obj=NULL, comm = 1)

Arguments

obj

data to be gathered. Could be different type.

root

rank of the gather

comm

a communicator number

...

optional arugments to sapply.

Details

Since sapply is used to gather all results, its default option "simplify=TRUE" is to simplify outputs. In some situations, this option is not desirable. Using "simplify=FALSE" as in the place of ... will tell sapply not to simplify and a list of outputs will be returned.

Value

For mpi.gather.Robj, it returns a list, the gathered message for the root member. For mpi.allgatherv.Robj, it returns a list, the gathered message for all members.

Author(s)

Hao Yu and Wei Xia

References

http://www.lam-mpi.org/, http://www-unix.mcs.anl.gov/mpi/www/www3/

See Also

mpi.gather, mpi.allgatherv.

Examples

 1
 2
 3
 4
 5
 6
 7
 8
 9
10
11
12
#Assume that there are some slaves running
mpi.bcast.cmd(id<-mpi.comm.rank())
mpi.bcast.cmd(x<-rnorm(id))
mpi.bcast.cmd(mpi.gather.Robj(x))
x<-"test mpi.gather.Robj"
mpi.gather.Robj(x)

mpi.bcast.cmd(obj<-rnorm(id+10))
mpi.bcast.cmd(nn<-mpi.allgather.Robj(obj))
obj<-rnorm(5)
mpi.allgather.Robj(obj)
mpi.remote.exec(nn)


Search within the Rmpi package
Search all R packages, documentation and source code

Questions? Problems? Suggestions? or email at ian@mutexlabs.com.

Please suggest features or report bugs with the GitHub issue tracker.

All documentation is copyright its authors; we didn't write any of that.