7 papers
Electron-Scale-Driven Turbulence by Negative-Density-Gradient in NSTX
C. Clauser, J. Candy, J. Parisi +7
Gyrokinetic simulations of an NSTX spherical-tokamak plasma reveal novel negative-density-gradient (NDG) drift waves at electron-gyroradius-scale that drive turbulent transport com…
The benefits and challenges of explicit memory management in OpenMP Target GPU offloading
Igor Sfiligoi
OpenMP Target Offload is a popular GPU technology for porting compute codes that operate on large buffers. One of the main usability features that is typically emphasized is the se…
Structuring agentic AI for HPC code modernization
Anthony Marinov, Igor Sfiligoi
Modernization of legacy scientific codes is often necessary to keep up with the ever-evolving changes in the compute resource ecosystem. Parallelization and migration from poorly s…
Benchmarking the Open Science Data Federation services to develop XRootD best practices
Fabio Andrijauskas, Igor Sfiligoi, Frank Würthwein
Research has become dependent on processing power and storage, one crucial aspect being data sharing. The Open Science Data Federation (OSDF) project aims to create a scientific gl…
Minimizing CGYRO HPC Communication Costs in Ensembles with XGYRO by Sharing the Collisional Constant Tensor Structure
Igor Sfiligoi, Emily A. Belli, Jeff Candy
First-principles fusion plasma simulations are both compute and memory intensive, and CGYRO is no exception. The use of many HPC nodes to fit the problem in the available memory th…
Comparing CPU and GPU compute of PERMANOVA on MI300A
Igor Sfiligoi
Comparing the tradeoffs of CPU and GPU compute for memory-heavy algorithms is often challenging, due to the drastically different memory subsystems on host CPUs and discrete GPUs.…