Blocking and Non-blocking Communication in MPI
In parallel computing with MPI (Message Passing Interface), communication between processes plays a crucial role in achieving efficient parallelization of algorithms. Two common approaches to communication are blocking and non-blocking communication. You can visit the detailed tutorial on MPI with Python here.
Blocking Communication
Blocking communication involves processes halting their execution until the communication operation is complete. In MPI, blocking communication functions like comm.send()
and comm.recv()
ensure that the sender waits until the receiver receives the message, and vice versa. Blocking communication is often used when processes need to synchronize their execution or when the sender and receiver must coordinate closely. While blocking communication simplifies program logic and synchronization, it can lead to potential performance bottlenecks if processes spend significant time waiting for communication to complete. Let’s see the below code;
from mpi4py import MPI
comm = MPI.COMM_WORLD
rank = comm.Get_rank()
if rank == 0:
data = {'a': 7, 'b': 3.14}
comm.send(data, dest=1, tag=11)
elif rank == 1:
data = comm.recv(source=0, tag=11)
Explanation
- Import MPI: The code begins by importing the MPI module from mpi4py library, which provides MPI functionalities for Python programs.
- Initialize MPI Communicator: The code initializes the MPI communicator
comm
representing all processes participating in the computation. - Get Rank: Each process in the communicator obtains its rank using
comm.Get_rank()
to determine its identity in the communicator. - Conditional Execution: Depending on the rank of the process:
- If the rank is 0:
- Create a Python dictionary
data
containing some sample data. - Use
comm.send()
to send the data to process 1 (dest=1
) with a specified tag (tag=11
).
- Create a Python dictionary
- If the rank is 1:
- Use
comm.recv()
to receive data from process 0 (source=0
) with the specified tag (tag=11
). The received data is stored in thedata
variable.
- Use
- If the rank is 0:
- Blocking Communication: Both
comm.send()
andcomm.recv()
are blocking operations. This means that the sender (comm.send()
) will be blocked until the receiver (comm.recv()
) receives the message, and vice versa. - Data Transfer: In this program, the dictionary
data
is sent from process 0 to process 1 using blocking communication. Process 1 waits to receive the data sent by process 0 before continuing its execution.
Non-blocking Communication
Non-blocking communication, on the other hand, allows processes to continue their execution immediately after initiating communication operations, without waiting for the operations to complete. In MPI, non-blocking communication functions like comm.isend()
and comm.irecv()
return a request object immediately, enabling processes to overlap computation with communication. Non-blocking communication is particularly useful in scenarios where processes can perform useful work while waiting for communication to progress. By overlapping computation with communication, non-blocking communication can improve overall performance and scalability in parallel applications. Let’s see the below code;
from mpi4py import MPI
comm = MPI.COMM_WORLD
rank = comm.Get_rank()
if rank == 0:
data = {'a': 7, 'b': 3.14}
req = comm.isend(data, dest=1, tag=11)
req.wait()
elif rank == 1:
req = comm.irecv(source=0, tag=11)
data = req.wait()
Explanation
- Import MPI: Similar to the blocking communication program, this code starts by importing the MPI module from mpi4py library.
- Initialize MPI Communicator and Get Rank: The MPI communicator
comm
is initialized, and the rank of the process is obtained usingcomm.Get_rank()
. - Conditional Execution: Depending on the rank of the process:
- If the rank is 0:
- Create a Python dictionary
data
containing some sample data. - Use
comm.isend()
to initiate the non-blocking sending of the data to process 1 (dest=1
) with a specified tag (tag=11
). The request objectreq
is returned. - Wait for the completion of the send operation using
req.wait()
.
- Create a Python dictionary
- If the rank is 1:
- Use
comm.irecv()
to initiate the non-blocking receiving of data from process 0 (source=0
) with the specified tag (tag=11
). The request objectreq
is returned. - Wait for the completion of the receive operation using
req.wait()
. The received data is stored in thedata
variable.
- Use
- If the rank is 0:
- Non-blocking Communication: In contrast to blocking communication, non-blocking communication operations (
comm.isend()
andcomm.irecv()
) do not block the execution of the process. Instead, they return a request object immediately, allowing the process to perform other tasks while the communication operation progresses asynchronously. - Data Transfer: Similarly, the dictionary
data
is sent from process 0 to process 1, but this time using non-blocking communication. Process 1 initiates the receive operation and waits for the data to be received asynchronously.
279 thoughts on “Blocking and Non-blocking Communication in MPI”
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