DiRAC

DiRAC. The Distributed Research utilising Advanced Computing (DiRAC) facility is a integrated supercomputing service for theoretical modeling and HPC-based research in the United Kingdom. It provides tailored resources to the national particle physics, astronomy, nuclear physics, and cosmology communities. Funded primarily by the Science and Technology Facilities Council and UK Research and Innovation, it operates across several university-hosted sites, each specializing in different hardware architectures to support a wide range of computational workloads.

Overview

DiRAC functions as a federated, nationally coordinated service, integrating High Performance Computing resources at the University of Cambridge, the University of Edinburgh, Durham University, and the University of Leicester. This model allows it to provide a variety of system architectures, including CPU-based clusters, GPU-accelerated systems, and large-memory machines, optimized for different scientific challenges. The facility supports the research programmes of the STFC community, enabling large-scale simulations that are critical for interpreting data from international experiments like those at CERN and the European Space Agency. Its operations are essential for advancing theoretical understanding in fields governed by the Standard Model and general relativity.

History

The DiRAC facility was established in 2009 following a recognized need to consolidate and strategically invest in the UK's computational infrastructure for theoretical physics. Its creation was driven by the Science and Technology Facilities Council in response to recommendations from the scientific community. Initial funding equipped the first service sites, and the facility has since undergone several major capital investment rounds, such as DiRAC-2 and DiRAC-3, to refresh and expand its technological capabilities. These upgrades have consistently involved partnerships with leading technology firms like Intel, AMD, and NVIDIA to deploy cutting-edge hardware. The evolution of DiRAC mirrors the growing complexity of simulations in cosmology and particle physics, necessitating ever-greater computational power.

Scientific objectives and research areas

The primary scientific objective of DiRAC is to enable world-leading simulations that probe fundamental questions about the universe. Key research areas include cosmological simulations of structure formation and the evolution of the Lambda-CDM model, which require immense computing power to track billions of particles. In particle physics, researchers use DiRAC to perform precise calculations of quantum phenomena within the Standard Model, such as lattice QCD computations, which are vital for interpreting results from the Large Hadron Collider. Additional focus areas include modeling astrophysical phenomena like supernova explosions, neutron star mergers, and the dynamics of dark matter halos, directly supporting missions from the James Webb Space Telescope.

Technical infrastructure

DiRAC's technical strength lies in its heterogeneous, multi-site infrastructure, designed to match architecture to algorithmic need. The facility encompasses several world-class systems, including the COSMA machine at Durham University, optimized for memory-intensive cosmological simulations. The University of Edinburgh hosts a GPU-rich system for tasks like machine learning and astrophysical fluid dynamics, while the University of Cambridge provides a high-throughput cluster for particle physics. The University of Leicester manages a system specializing in data-intensive analysis. These systems are interconnected via the JANET network and utilize advanced parallel filesystems and software stacks co-developed with international consortia like the Intel Parallel Computing Centers.

Governance and funding

Governance of DiRAC is overseen by a Director and a Management Board, with strategic guidance from an International Science Board comprising experts from institutions like CERN and the Max Planck Society. Primary funding is allocated by the Science and Technology Facilities Council and distributed through UK Research and Innovation. Additional support and hardware contributions often come from university partners and industry collaborations. Resource allocation is managed via a peer-reviewed proposal system administered by a Time Allocation Panel, ensuring compute time is awarded based on scientific merit and alignment with STFC's strategic goals.

Impact and recognition

The impact of DiRAC is evidenced by its central role in high-profile scientific discoveries and its support for the UK's research leadership. Work enabled by the facility has contributed to interpreting gravitational wave signals observed by LIGO, understanding the properties of the Higgs boson, and producing flagship cosmological simulations like the EAGLE project. It is recognized as a critical national infrastructure, training a generation of computational scientists and maintaining the UK's competitive edge in fields like astroparticle physics. The success of its federated model has influenced the design of other national computing resources and strengthened the UK's position within international projects such as the SKA Observatory and Square Kilometre Array. Category:High-performance computing Category:Scientific computing Category:Research institutes in the United Kingdom Category:Science and Technology Facilities Council