Our research projects vary in size, scope, and duration, but they share a focus on developing tools and methods that help LLNL deliver on its missions to the nation and, more broadly, advance the state of the art in scientific HPC. Projects are organized here in three ways: Active projects are those currently funded and regularly updated. Legacy projects are no longer actively developed. The A-Z option sorts all projects alphabetically, both active and legacy.

Active | A-Z | Legacy

XBraid

Parallel Time Integration with Multigrid

This project constructs coarse time grids and uses each solution to improve the next finer-scale solution, simultaneously updating a solution guess over the entire space-time domain.

SCR

Scalable Checkpoint/Restart for MPI

With SCR, jobs run more efficiently, recover more work upon failure, and reduce load on critical shared resources.

BLAST

High-Order Finite Element Hydrodynamics

BLAST is a high-order finite element hydrodynamics research code that improves the accuracy of simulations and provides a path to extreme parallel computing and exascale architectures.

Legacy

GREMLINs

Emulating Exascale Conditions on Today's Platforms

These techniques emulate the behavior of anticipated future architectures on current machines to improve performance modeling and evaluation.

Memory-Centric Architectures

Exploiting Emerging Persistent Memory

A new, complex memory/storage hierarchy is emerging, with persistent memories offering greatly expanded capacity, and augmented by DRAM/SRAM cache and scratchpads to mitigate latency.

LMAT

Livermore Metagenomics Analysis Toolkit

This genome sequencing technology helps accelerate the comparison of genetic fragments with reference genomes and improve the accuracy of the results as compared to previous technologies.

Legacy

AutomaDeD

Diagnosing Performance and Correctness Faults

This tool that automatically diagnoses performance and correctness faults in MPI applications. It identifies abnormal MPI tasks and code regions and finds the least-progressed task.

Application-Level Resilience

Efficient Algorithmic Fault Tolerance

Application-level resilience is emerging as an alternative to traditional fault tolerance approaches because it provides fault tolerance at a lower cost than traditional approaches.

Legacy

Veritas

Validating Proxy Apps

Veritas provides a method for validating proxy applications to ensure that they capture the intended characteristics of their parents.

Legacy

MPI_T

Tools for MPI 3.0

MPI_T is an interface for tools introduced in the 3.0 version of MPI. The interface provides mechanisms for tools to access and set performance and control variables that are exposed by an MPI…

Cram

Running Millions of Concurrent MPI Jobs

Cram lets you easily run many small MPI jobs within a single, large MPI job by splitting MPI_COMM_WORLD up into many small communicators to run each job in the cram file independently.

Legacy

libMSR

Power Measurement

libMSR provides a convenient interface to access Model Specific Registers and to allow tools to utilize their full functionality.

Caliper

Application Introspection System

Caliper enables users to build customized performance measurement and analysis solutions by connecting independent context annotations, measurement services, and data processing services.

Legacy

Quantum Molecular Dynamics

Scalable Simulations and Algorithms with Reduced Complexity

A new algorithm for use with first-principles molecular dynamics codes enables the number of atoms simulated to be proportional to the number of processors available.

Serpentine Wave Propagation

Advanced Finite Difference Methods

These methods for solving hyperbolic wave propagation problems allow for complex geometries, realistic boundary and interface conditions, and arbitrary heterogeneous material properties.

Spindle

Scalable Shared Library Loading

Spindle improves the library-loading performance of dynamically linked HPC applications by plugging into the system’s dynamic linker and intercepting its file operations.

Legacy

P^nMPI

Low-Overhead Wrapper Library

PnMPI is a thin, low-overhead wrapper library that is automatically generated from mpi.h file and that can be linked by default.

Legacy

HARVEY

Predictive Vascular Modeling of Blood Flow in Patient-Specific Geometries

Livermore researchers are enhancing HARVEY, an open-source parallel fluid dynamics application designed to model blood flow in patient-specific geometries.

PAVE

Performance Analysis and Visualization at Exascale

Performance analysis of parallel scientific codes is difficult. The HAC model allows direct comparison of data across domains with data viz and analysis tools available in other domains.

FGFS

Fast Global File Status

Fast Global File Status (FGFS) is an open-source package that provides scalable mechanisms and programming interfaces to retrieve global information of a file.

Legacy

NSDE

Nonlinear Solvers and Differential Equations

The NSDE project is focused on research and development of nonlinear solvers and sensitivity analysis techniques for nonlinear, time-dependent, and steady-state partial differential equations.

Legacy

HZIP

Lossless Compression of Meshes

hzip 1.0.1 is a C++ library for lossless compression of structured and unstructured meshes composed of cells with hypercube topology.

PSUADE

Non-Intrusive Uncertainty Quantification

The flourishing of simulation-based scientific discovery has also resulted in the emergence of the UQ discipline, which is essential for validating and verifying computer models.

Legacy

ODEPACK

Fortran ODE Solvers

These Fortran solvers tackle the initial value problem for ODE systems. The collection includes solvers for systems given in both explicit and linearly implicit forms.