p2pmpi.mpi
Class IntraComm

java.lang.Object
  p2pmpi.mpi.Comm
      p2pmpi.mpi.IntraComm

public class IntraComm
extends Comm

Collective communication class

Constructor Summary

IntraComm(Group group)
Create a new collective communicator by group

IntraComm(p2pmpi.mpi.internal.MessageHandler msgHandle, p2pmpi.common.RankTable rankTable, int rank, int rankInList, int numRank, p2pmpi.common.MapRankTable mapRankTable)
Internal use

Method Summary

void	Allgather(java.lang.Object sendBuffer, int sendOffset, int sendCount, Datatype sendType, java.lang.Object recvBuffer, int recvOffset, int recvCount, Datatype recvType) Gathers data from all tasks and distribute it to all
void	Allgatherv(java.lang.Object sendBuffer, int sendOffset, int sendCount, Datatype sendType, java.lang.Object recvBuffer, int recvOffset, int[] recvCount, int[] displs, Datatype recvType) Gathers data from all tasks and deliver it to all
void	Allreduce(java.lang.Object sendBuffer, int sendOffset, java.lang.Object recvBuffer, int recvOffset, int count, Datatype datatype, Op op) Reduce the result and then broadcast it to all MPI processes
void	Alltoall(java.lang.Object sendBuffer, int sendOffset, int sendCount, Datatype sendType, java.lang.Object recvBuffer, int recvOffset, int recvCount, Datatype recvType) Reduce the result and then broadcast it to all MPI processes
void	Alltoallv(java.lang.Object sendBuffer, int sendOffset, int[] sendCount, int[] sdispls, Datatype sendType, java.lang.Object recvBuffer, int recvOffset, int[] recvCount, int[] rdispls, Datatype recvType) Reduce the result and then broadcast it to all MPI processes with variable size
void	Barrier() Synchronize MPI processes
void	Bcast(java.lang.Object buffer, int offset, int count, Datatype datatype, int root) Broadcast a message to all MPI processes
IntraComm	Create(Group group) Create a new intra-communicator
void	Gather(java.lang.Object sendBuffer, int sendOffset, int sendCount, Datatype sendType, java.lang.Object recvBuffer, int recvOffset, int recvCount, Datatype recvType, int root) Gathers together values from a group of tasks
void	Gatherv(java.lang.Object sendBuffer, int sendOffset, int sendCount, Datatype sendType, java.lang.Object recvBuffer, int recvOffset, int[] recvCount, int[] displs, Datatype recvType, int root) Gathers into specified locations from all processes in group
void	Reduce_scatter(java.lang.Object sendBuffer, int sendOffset, java.lang.Object recvBuffer, int recvOffset, int[] recvCount, Datatype datatype, Op op) Combines value and scatters the results
void	Reduce(java.lang.Object sendBuffer, int sendOffset, java.lang.Object recvBuffer, int recvOffset, int count, Datatype datatype, Op op, int root) MPI collective operation reduce from all MPI processes (Binomail tree by default)
void	Scan(java.lang.Object sendbuf, int sendoffset, java.lang.Object recvbuf, int recvoffset, int count, Datatype datatype, Op op) Computes the scan (partial reductions) of data on a collection of processes
void	Scatter(java.lang.Object sendBuffer, int sendOffset, int sendCount, Datatype sendType, java.lang.Object recvBuffer, int recvOffset, int recvCount, Datatype recvType, int root) Sends data from one task to all other tasks in a group
void	Scatterv(java.lang.Object sendBuffer, int sendOffset, int[] sendCount, int[] displs, Datatype sendType, java.lang.Object recvBuffer, int recvOffset, int recvCount, Datatype recvType, int root) Sends a buffer in parts to all tasks in a group
IntraComm	Split(int color, int key)

Methods inherited from class p2pmpi.mpi.Comm

Group, Irecv, Object_Deserialize, Object_Serialize, Rank, Recv, Send, Sendrecv, Size, SizeTotal

Methods inherited from class java.lang.Object

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

Constructor Detail

IntraComm

public IntraComm(p2pmpi.mpi.internal.MessageHandler msgHandle,
                 p2pmpi.common.RankTable rankTable,
                 int rank,
                 int rankInList,
                 int numRank,
                 p2pmpi.common.MapRankTable mapRankTable)

Internal use

IntraComm

public IntraComm(Group group)

Create a new collective communicator by group

Parameters:

group - Group

Method Detail

Create

public IntraComm Create(Group group)

Create a new intra-communicator

Parameters:

group - Group

Returns:

a new inter-communicator

Barrier

public void Barrier()

Synchronize MPI processes

Bcast

public void Bcast(java.lang.Object buffer,
                  int offset,
                  int count,
                  Datatype datatype,
                  int root)

Broadcast a message to all MPI processes

Parameters:

buffer - Send object

offset - Offset of send object

count - Number of elements

datatype - Type of send object

root - MPI Rank of root node

Reduce

public void Reduce(java.lang.Object sendBuffer,
                   int sendOffset,
                   java.lang.Object recvBuffer,
                   int recvOffset,
                   int count,
                   Datatype datatype,
                   Op op,
                   int root)

MPI collective operation reduce from all MPI processes (Binomail tree by default)

Parameters:

sendBuffer - Send object

sendOffset - Send object offset

recvBuffer - Receive object

recvOffset - Receive object offset

count - Number of elements

datatype - MPI datatype

op - Operation used in reduce

root - MPI rank of root node which maintain the result

Allreduce

public void Allreduce(java.lang.Object sendBuffer,
                      int sendOffset,
                      java.lang.Object recvBuffer,
                      int recvOffset,
                      int count,
                      Datatype datatype,
                      Op op)

Reduce the result and then broadcast it to all MPI processes

Parameters:

sendBuffer - Send object

sendOffset - Send object offset

recvBuffer - Receive object

recvOffset - Receive object offset

count - Number of elements

datatype - MPI datatype

op - Operation used in reduce

Alltoallv

public void Alltoallv(java.lang.Object sendBuffer,
                      int sendOffset,
                      int[] sendCount,
                      int[] sdispls,
                      Datatype sendType,
                      java.lang.Object recvBuffer,
                      int recvOffset,
                      int[] recvCount,
                      int[] rdispls,
                      Datatype recvType)

Reduce the result and then broadcast it to all MPI processes with variable size

Parameters:

sendBuffer - Send object

sendOffset - Send object offset

sendCount - Number of elements for sending

sdispls - Displacement of send object

sendType - MPI datatype of send object

recvBuffer - Receive object

recvOffset - Receive object offset

recvCount - Number of elements for receiving

rdispls - Displacement of receive object

recvType - MPI datatype of receive object

Alltoall

public void Alltoall(java.lang.Object sendBuffer,
                     int sendOffset,
                     int sendCount,
                     Datatype sendType,
                     java.lang.Object recvBuffer,
                     int recvOffset,
                     int recvCount,
                     Datatype recvType)

Reduce the result and then broadcast it to all MPI processes

Parameters:

sendBuffer - Send object

sendOffset - Send object offset

sendCount - Number of elements for sending

sendType - MPI datatype of send object

recvBuffer - Receive object

recvOffset - Receive object offset

recvCount - Number of elements for receiving

recvType - MPI datatype of receive object

Gather

public void Gather(java.lang.Object sendBuffer,
                   int sendOffset,
                   int sendCount,
                   Datatype sendType,
                   java.lang.Object recvBuffer,
                   int recvOffset,
                   int recvCount,
                   Datatype recvType,
                   int root)

Gathers together values from a group of tasks

Parameters:

sendBuffer - send object

sendOffset - send object offset

sendCount - number of elements for sending

sendType - MPI datatype of send object

recvBuffer - receive object

recvOffset - receive object offset

recvCount - number of elements for receiving

recvType - MPI datatype of receive object

root - node to gather the value

Gatherv

public void Gatherv(java.lang.Object sendBuffer,
                    int sendOffset,
                    int sendCount,
                    Datatype sendType,
                    java.lang.Object recvBuffer,
                    int recvOffset,
                    int[] recvCount,
                    int[] displs,
                    Datatype recvType,
                    int root)

Gathers into specified locations from all processes in group

Parameters:

sendBuffer - send object

sendOffset - send object offset

sendCount - number of elements in send object

sendType - datatype of send object elements

recvBuffer - receive object

recvOffset - receive object offset

recvCount - integer array (of length group size) containing the number of elements that are received from each process

displs - integer array (of length group size). Entry i specifies the displacement relative to recvOffset of recvBuffer at which to place the incoming data from process i

recvType - MPI datatype of receive object

root - node to gather the value

Allgather

public void Allgather(java.lang.Object sendBuffer,
                      int sendOffset,
                      int sendCount,
                      Datatype sendType,
                      java.lang.Object recvBuffer,
                      int recvOffset,
                      int recvCount,
                      Datatype recvType)

Gathers data from all tasks and distribute it to all

Parameters:

sendBuffer - send object

sendOffset - send object offset

sendCount - number of elements for sending

sendType - MPI datatype of send object

recvBuffer - receive object

recvOffset - receive object offset

recvCount - number of elements for receiving

recvType - MPI datatype of receive object

Allgatherv

public void Allgatherv(java.lang.Object sendBuffer,
                       int sendOffset,
                       int sendCount,
                       Datatype sendType,
                       java.lang.Object recvBuffer,
                       int recvOffset,
                       int[] recvCount,
                       int[] displs,
                       Datatype recvType)

Gathers data from all tasks and deliver it to all

Parameters:

sendBuffer - send object

sendOffset - send object offset

sendCount - number of elements for sending

sendType - MPI datatype of send object

recvBuffer - receive object

recvOffset - receive object offset

recvCount - integer array (of length group size) containing the number of elements that are received from each process

displs - integer array (of length group size). Entry i specifies the displacement relative to recvOffset of recvBuffer at which to place the incoming data from process i

recvType - MPI datatype of receive object

Scatter

public void Scatter(java.lang.Object sendBuffer,
                    int sendOffset,
                    int sendCount,
                    Datatype sendType,
                    java.lang.Object recvBuffer,
                    int recvOffset,
                    int recvCount,
                    Datatype recvType,
                    int root)

Sends data from one task to all other tasks in a group

Parameters:

sendBuffer - send object

sendOffset - send object offset

sendCount - number of elements for sending

sendType - MPI datatype of send object

recvBuffer - receive object

recvOffset - receive object offset

recvCount - number of elements for receiving

recvType - MPI datatype of receive object

root - rank of sending process

Scatterv

public void Scatterv(java.lang.Object sendBuffer,
                     int sendOffset,
                     int[] sendCount,
                     int[] displs,
                     Datatype sendType,
                     java.lang.Object recvBuffer,
                     int recvOffset,
                     int recvCount,
                     Datatype recvType,
                     int root)

Sends a buffer in parts to all tasks in a group

Parameters:

sendBuffer - send object

sendOffset - send object offset

sendCount - integer array (of length group size) specifying the number of elements to send to each processor

displs - integer array (of length group size). Entry i specifies the displacement relative to process i

sendType - MPI datatype of send object

recvBuffer - receive object

recvOffset - receive object offset

recvCount - number of elements for receiving

recvType - MPI datatype of receive object

root - rank of sending process

Reduce_scatter

public void Reduce_scatter(java.lang.Object sendBuffer,
                           int sendOffset,
                           java.lang.Object recvBuffer,
                           int recvOffset,
                           int[] recvCount,
                           Datatype datatype,
                           Op op)

Combines value and scatters the results

Parameters:

sendBuffer - send object

sendOffset - send object offset

recvBuffer - receive object

recvOffset - receive object offset

recvCount - integer array specifying the number of elements in result distributed to each process

datatype - data type of elements of sending object (handle)

op - operation (handle)

Scan

public void Scan(java.lang.Object sendbuf,
                 int sendoffset,
                 java.lang.Object recvbuf,
                 int recvoffset,
                 int count,
                 Datatype datatype,
                 Op op)

Computes the scan (partial reductions) of data on a collection of processes

Parameters:

sendbuf - send buffer

sendoffset - send buffer offset

recvbuf - receive buffer

recvoffset - receive buffer offset

count - number of elements

datatype - data type

op - operation

Split

public IntraComm Split(int color,
                       int key)