The Voltaire Fabric Collective Accelerator (FCA) is a solution that offloads collective operations from CPUs to switches to accelerate performance and scalability. It uses CPUs in switches to perform reduction and messaging for collective operations. The FCA addresses network congestion through single-message transmissions per wire and shields collectives from node noise. It can reduce collective operation runtimes by up to 100x and enable linear scalability to thousands of nodes.

1. Voltaire Fabric Collective Accelerator ™ (FCA) Accelerate your Fabric

3. Collective Communication Portion of MPI Runtime Percentage Collective Operations % of MPI Job Runtime

4. Introducing Voltaire Fabric Collective Accelerator (FCA) ……… . CPU in switch used to offload collective operations Collective tree & Rank placement optimized to the topology Use of IB multicast for result distribution Inter-core communication optimized + + + + + +

7. FCA Preliminary Performance Results 78% 66%

8. FCA What is the alternative/competitive solution? A Fabric Wide Challenge requires a Fabric Wide Solution Integration with Job Schedulers Network Congestion Elimination Fabric switches offload computation 1-2% 30-40% Expected MPI Job runtime Improvement OS “noise” reduction Result distribution based on IB multicast Topology aware NIC-based offload FCA

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