GRACE: An End-to-End Graph Processing Accelerator on FPGA With Graph Reordering Engine

Graphs play an important role in various applications. With the rapid expansion of vertices in real life, existing large-scale graph processing frameworks on CPUs and GPUs encounter challenges in optimizing cache usage due to irregular memory access patterns. To address this, graph reordering has been proposed to improve the locality of the graph, but introduces significant overhead without delivering substantial end-to-end performance improvement. While there have been many FPGA-based accelerators for graph processing, achieving high throughput often requires complex graph prepossessing on CPUs. Therefore, implementing an efficient end-to-end graph processing system remains challenging. This article introduces GRACE, an end-to-end FPGA-based graph processing accelerator with a graph reordering engine and a pull-based vertex-centric programming model (PL-VCPM) Engine. First, GRACE employs a customized high-degree vertex cache (HDC) to improve memory access efficiency. Second, GRACE offloads the graph preprocessing to FPGA. We customize an efficient graph reordering engine to complete preprocessing. Third, GRACE adopts a graph pruning strategy to remove the activation and computation redundancy in graph processing. Finally, GRACE introduces a graph conflict board (GCB) to resolve data conflicts and a multiport cache to enhance parallel efficiency. Experimental results demonstrate that GRACE achieves $7.1 \times $ end-to-end performance speedup over CPU and $1.8 \times $ over GPU, as well as $27.3 \times $ and $8.7 \times $ energy efficiency over CPU and GPU. Moreover, GRACE delivers up to $34.9 \times $ performance speedup compared to the state-of-the-art FPGA accelerator.