The Parallel Systems Group carries out research to facilitate the use of extreme-scale computers for scientific discovery. We are especially focused on tools research to maximize the effectiveness of applications running on today’s largest parallel computers.

Extreme Parallel MPI Strong Scalability of a 2D Sedov Simulation with Very High-Order Finite Elements. Comparing extreme strong scaling results on 131,072 processors of LLNL's Vulcan computer for the 2D Sedov test problem using two different approaches for high-order parallel finite element computations: our default approach where high-order matrices are assembled …

Software releases on GitHub. SAMRAI (Structured Adaptive Mesh Refinement Application Infrastructure) is an object-oriented C++ software library that enables exploration of numerical, algorithmic, parallel computing, and software issues associated with applying structured adaptive mesh refinement (SAMR) technology in large-scale parallel application development.

As LLNL’s investment in GPU architectures grows, so too does exploration of new programming paradigms to support code portability on parallel computing platforms. For example, when Sierra came online in 2018, we began porting our existing codes to pragma-based technologies (e.g., OpenMP) and vendor language extensions (e.g., CUDA) to run on ...

Jan 6, 2012 · Computing at LLNL advances scientific discovery through foundational and innovative research; mission-driven data science; complex modeling, simulation, and analysis on powerful supercomputers; and creative technologies and software solutions. Everything at Livermore is Team Science.

Large-scale parallel computing systems generate massive amounts of data every second, and file systems are crucial for handling data transfer at LLNL’s HPC center. Livermore Computing’s ( LC ’s) Scalable Storage group helps manage the hardware and software necessary to keep file systems—and therefore supercomputers—running smoothly ...

The SAMRAI (Structured Adaptive Mesh Refinement Application Infrastructure) library is the code base in CASC for exploring application, numerical, parallel computing, and software issues associated with SAMR. SAMRAI development has been funded primarily by the DOE Advanced Simulation and Computing (ASC) Program. This investment is complemented ...

Through research funded at LLNL, scientists have developed BLAST, a high-order finite element hydrodynamics research code that improves the accuracy of simulations and provides a viable path to extreme parallel computing and exascale architectures.

The resulting parallel-in-time method is a scalable multigrid reduction in time (MGRIT) approach. MGRIT constructs coarse time grids by coarsening every few time steps on a given level and uses each coarse time scale solution to improve the next finer-scale solution.

Release Information. P n MPI is released under the LGPL license and is available on GitHub.. Publications. Martin Schulz, Bronis R. de Supinski, PnMPI Tools: A Whole Lot Greater Than the Sum of Their Parts, Proceedings of SC 2007.