mpi

Class CartComm

java.lang.Object

mpi.Comm

mpi.Intracomm

mpi.CartComm

All Implemented Interfaces:

Freeable

public final class CartComm
extends Intracomm

Communicator with cartesian structure.

Field Summary

Fields inherited from class mpi.Comm

handle, SELF, WORLD

Constructor Summary

Constructors

Modifier	Constructor and Description
protected	CartComm(long handle)
protected	CartComm(long[] commRequest)

Method Summary

Modifier and Type	Method and Description
CartComm	clone() Duplicates this communicator.
static void	createDims(int nnodes, int[] dims) Select a balanced distribution of processes per coordinate direction.
CartComm	dup() Duplicates this communicator.
int[]	getCoords(int rank) Translate process rank to logical process coordinates.
int	getRank(int[] coords) Translate logical process coordinates to process rank.
CartParms	getTopo() Returns cartesian topology information.
CartComm	iDup() Duplicates this communicator.
int	map(int[] dims, boolean[] periods) Compute an optimal placement.
ShiftParms	shift(int direction, int disp) Compute source and destination ranks for "shift" communication.
CartComm	sub(boolean[] remainDims) Partition cartesian communicator into subgroups of lower dimension.

Methods inherited from class mpi.Intracomm

accept, accept, closePort, connect, connect, create, createCart, createDistGraph, createDistGraph, createDistGraphAdjacent, createDistGraphAdjacent, createGraph, exScan, exScan, iExScan, iExScan, iScan, iScan, lookupName, lookupName, openPort, openPort, publishName, publishName, scan, scan, spawn, spawnMultiple, split, unpublishName, unpublishName

Methods inherited from class mpi.Comm

abort, allGather, allGather, allGatherv, allGatherv, allReduce, allReduce, allToAll, allToAllv, barrier, bcast, bSend, bSendInit, compare, createIntercomm, createKeyval, deleteAttr, disconnect, dup, free, freeKeyval, gather, gather, gatherv, gatherv, gatherv, getAttr, getErrhandler, getGroup, getInfo, getName, getRank, getRequest, getSize, getTopology, iAllGather, iAllGather, iAllGatherv, iAllGatherv, iAllReduce, iAllReduce, iAllToAll, iAllToAllv, iBarrier, iBcast, ibSend, iDup, iGather, iGather, iGatherv, iGatherv, iGatherv, iNeighborAllGather, iNeighborAllGatherv, iNeighborAllToAll, iNeighborAllToAllv, iProbe, iRecv, iReduce, iReduce, iReduceScatter, iReduceScatter, iReduceScatterBlock, iReduceScatterBlock, irSend, iScatter, iScatter, iScatterv, iScatterv, iScatterv, iSend, isInter, isNull, isSend, neighborAllGather, neighborAllGatherv, neighborAllToAll, neighborAllToAllv, pack, packSize, probe, recv, recvInit, reduce, reduce, reduceLocal, reduceScatter, reduceScatter, reduceScatterBlock, reduceScatterBlock, rSend, rSendInit, scatter, scatter, scatterv, scatterv, scatterv, send, sendInit, sendRecv, sendRecvReplace, setAttr, setErrhandler, setInfo, setName, setType, sSend, sSendInit, unpack

Methods inherited from class java.lang.Object

equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

CartComm

protected CartComm(long handle)
            throws MPIException

Throws:

MPIException

CartComm

protected CartComm(long[] commRequest)

Method Detail

clone

public CartComm clone()

Duplicates this communicator.

Java binding of MPI_COMM_DUP.

It is recommended to use dup() instead of clone() because the last can't throw an MPIException.

Overrides:

clone in class Intracomm

Returns:

copy of this communicator

dup

public CartComm dup()
             throws MPIException

Duplicates this communicator.

Java binding of MPI_COMM_DUP.

Overrides:

dup in class Intracomm

Returns:

copy of this communicator

Throws:

MPIException

iDup

public CartComm iDup()
              throws MPIException

Duplicates this communicator.

Java binding of MPI_COMM_IDUP.

The new communicator can't be used before the operation completes. The request object must be obtained calling Comm.getRequest().

Overrides:

iDup in class Intracomm

Returns:

copy of this communicator

Throws:

MPIException

getTopo

public CartParms getTopo()
                  throws MPIException

Returns cartesian topology information.

Java binding of the MPI operations MPI_CARTDIM_GET and MPI_CART_GET.

The number of dimensions can be obtained from the size of (eg) dims field of the returned object.

Returns:

object containing dimensions, periods and local coordinates

Throws:

MPIException

getRank

public int getRank(int[] coords)
            throws MPIException

Translate logical process coordinates to process rank.

Java binding of the MPI operation MPI_CART_RANK.

Parameters:

coords - Cartesian coordinates of a process

Returns:

rank of the specified process

Throws:

MPIException

getCoords

public int[] getCoords(int rank)
                throws MPIException

Translate process rank to logical process coordinates.

Java binding of the MPI operation MPI_CART_COORDS.

Parameters:

rank - rank of a process

Returns:

Cartesian coordinates of the specified process

Throws:

MPIException

shift

public ShiftParms shift(int direction,
                        int disp)
                 throws MPIException

Compute source and destination ranks for "shift" communication.

Java binding of the MPI operation MPI_CART_SHIFT.

Parameters:

direction - coordinate dimension of shift

disp - displacement

Returns:

object containing ranks of source and destination processes

Throws:

MPIException

sub

public CartComm sub(boolean[] remainDims)
             throws MPIException

Partition cartesian communicator into subgroups of lower dimension.

Java binding of the MPI operation MPI_CART_SUB.

Parameters:

remainDims - by dimension, true if dimension is to be kept, false otherwise

Returns:

communicator containing subgrid including this process

Throws:

MPIException

map

public int map(int[] dims,
               boolean[] periods)
        throws MPIException

Compute an optimal placement.

Java binding of the MPI operation MPI_CART_MAP.

The number of dimensions is taken to be size of the dims argument.

Parameters:

dims - the number of processes in each dimension

periods - true if grid is periodic, false if not, in each dimension

Returns:

reordered rank of calling process

Throws:

MPIException

createDims

public static void createDims(int nnodes,
                              int[] dims)
                       throws MPIException

Select a balanced distribution of processes per coordinate direction.

Java binding of the MPI operation MPI_DIMS_CREATE.

Parameters:

nnodes - number of nodes in a grid

dims - array specifying the number of nodes in each dimension

Throws:

MPIException