Draft:Libfabric
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libfabric, also known as OpenFabrics Interfaces (OFI), is an open-source communication library framework that provides high-performance networking services for applications in high-performance computing (HPC), distributed computing, and parallel computing.[1]
It defines a low-level application programming interface (API) designed to abstract underlying network hardware and support efficient data transfer across communication fabrics such as InfiniBand, Ethernet, and shared memory systems.[2]
Overview
[edit]libfabric provides a portable interface for communication between processes in distributed environments. Its design seeks to expose the capabilities of modern network hardware while maintaining a consistent programming model.[2]
The library is developed within the OpenFabrics Interfaces Working Group (OFIWG), part of the OpenFabrics Alliance.[1]
libfabric is used as a communication layer in middleware such as Message Passing Interface (MPI) implementations, including Open MPI.[2]
Design
[edit]libfabric employs a modular architecture that separates application-level communication logic from network-specific implementations.[2]
The API is structured around a set of core abstractions, including:
- Fabric, representing the communication infrastructure
- Domain, representing access to a communication resource
- Endpoint, providing communication capabilities
- Completion and event queues, used to track asynchronous operations
- Address vectors, used for peer addressing
- Memory regions, enabling direct memory access operations
These abstractions allow applications to interact with a range of network technologies through a unified interface.[2]
Communication models
[edit]libfabric supports multiple communication paradigms, including:
- Message-based communication using send and receive operations
- Tagged messaging
- Remote direct memory access (RMA)
- Atomic operations on remote data[2]
These models support both two-sided and one-sided communication patterns commonly used in HPC applications.
Usage
[edit]libfabric is used in high-performance computing environments and distributed systems as a networking abstraction layer.[2] It is commonly employed by MPI implementations and other parallel programming frameworks to provide scalable communication across computer clusters and supercomputers.