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void main(int argc, char *argv)
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starts up the MPI runtime environment at the beginning of a run.
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MPI_Finalize()
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shuts down the MPI runtime environment at the end of a run.
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MPI_Comm_rank(MPI_COMM_WORLD,&myid)
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gets the process ID that the current process uses, which is between 0 and Np-1 inclusive.
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MPI_Comm_size(MPI_COMM_WORLD,&numprocs)
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gets the number of processes in a run.
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MPI_CHAR
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char
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MPI_SHORT
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short int
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MPI_INT
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int
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MPI_FLOAT
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float
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MPI_DOUBLE
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double
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MPI_LONG_DOUBLE
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long double
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MPI_BYTE
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consists of a byte (8 binary digits)
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mpicc -o file file.c
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compiles MPI programs written in C.
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mpiCC -o file file.cpp
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compiles MPI programs written in C++.
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mpirun -np no_processors file
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run MPI compiled file with no_processors
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MPI_Wtime()
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Returns an elapsed time on the calling processor
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b
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The message to be broadcasted
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c
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Number of elements in the message
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d
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The data type of the elements in the message
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root
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The process number that has the message to be broadcasted to others
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MPI_Comm
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The communication world
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b
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Receive in buffer b
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c
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The number of element of data type d
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d
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The data type of element b
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sender
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The rank of the sender
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t
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The tag used in the communication
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MPI_Comm
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The communication world
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status
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the status of the reception operation
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sb
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The buffer containing the data to disptach from the root process.
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sc
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The number of elements to send to each process, not the total number of elements in the send buffer.
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sd
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The type of one send buffer element
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rb
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The buffer in which store the data dispatched.
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rc
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The number of elements in the receive buffer
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rd
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The type of one receive buffer element.
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root
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The rank of the root process
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MPI_Comm
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The communication world
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<mpi.h>
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For MPI implementation
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<stdio.h>
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C input&output
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<math.h>
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Handles Math
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Blocking
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return after their actions complete
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Non-Blocking
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return immediately.
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Message Tag
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carried within message and used to differentiate between different types of messages being sent
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MPI_Status
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represents the status of a reception operation.
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MPI_Send()
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sends a message from the current process to some other process.
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MPI_Recv()
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receives a message on the current process from some other process.
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MPI_Bcast()
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Broadcast from root to all other processes
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MPI_Gather()
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Gather values for group of processes
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MPI_Scatter()
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Scatters buffer in parts to group of processes
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MPI_Alltoall()
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Sends data from all processes to all processes
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MPI_Reduce()
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Combine values on all processes to single value
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MPI_Reduce_scatter()
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Combine values and scatter results
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MPI_Isend()
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Non-blocking send; will return “immediately”
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MPI_Irecv()
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Nonblocking receive; will return even if no message to accept.
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MPI_Wait(request,status)
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waits until operation completed and returns then.
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MPI_Test()
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returns with flag set indicating whether operation completed at that time.
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d
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Send Data from address d
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c
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The number of elements of d
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m
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The Datatype of d
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receiver
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The rank of the reciever
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t
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The communication is marked with t tag
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MPI_Comm_World
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The communication world
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sb
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The sender buffer
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sc
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The number of elements in the buffer
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sd
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The datatype of one element in the buffer
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rb
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The buffer in which store the gathered data for the root process
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rc
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The number of elements per message received, not the total number of elements to receive from all processes altogether.
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rd
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The type of one receive buffer element.
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root
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MPI_Comm
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The communication world
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sb
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A pointer on the buffer to send for reduction.
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rb
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A pointer on the buffer in which store the result of the reduction
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c
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The number of elements in the send buffer
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d
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The type of a buffer element.
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op
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The operation to apply to combine messages received in the reduction
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root
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The rank of the MPI process that will collect the reduction result.
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MPI_Comm
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The communication world
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