Science Highlights

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Darshan has been integrated into the web portal at NERSC to provide feedback to scientists about application behavior. This screen shot shows an example of the I/O summary data that is available to users as soon as their job has completed. It indicates the amount of data accessed, the percentage of runtime consumed by I/O activity, and the access sizes used by the application.
Characterizing I/O performance on leadership-class systems

Argonne National Laboratory have developed Darshan, a scalable I/O characterization tool that collects I/O access pattern information from HPC production applications.

May 30, 2013
Argonne applied mathematicians use INCITE awards to attack energy problems

What is the best possible power grid configuration for our nation? How can we balance the increasing demands for power while minimizing costs and avoiding waste of resources?

March 27, 2013
MONJU reactor core: 715 assemblies, 99k volumes, 9.7M elements
New MOAB mesh software version released

Scientists use meshes to approximate a geometric domain for solving complex engineering analysis problems.

March 6, 2013
Fig. 1: Zoom-in visualization of the matter density field in a 1.07 trillion particle, 9.14-gigaparsec (Gpc) box-size simulation with HACC on sixteen BG/Q racks. This figure illustrates the global spatial dynamic range covered by the simulation, of approximately a part per million, although the finer details are not resolved by the visualization. (Note: 1 Gpc is about 3.26 billion light-years; 1 Mpc, or megaparsec, is about 3.26 million light-years.)
Shedding Light on Dark Matter and Dark Energy

Dark matter and dark energy — together accounting for 95% of the mass-energy of the universe — remain mysterious. With funding from the DOE Office of Science, Argonne is now studying these pillars of cosmology.

March 6, 2013
Using large eddy simulations to understand flow mixing

In nuclear power plants, turbulent flow streams of different velocity and density mix rapidly at right angles in pipes.

March 4, 2013
Addressing the mathematical challenges of electrical energy systems

The U.S. Department of Energy’s (DOE) Argonne National Laboratory has been awarded a grant from the DOE Office of Science to tackle the long-term mathematical challenges arising in complex electrical energy systems.

February 18, 2013
The Magellan Project: Building High-Performance Clouds

Motivated by the success of the Magellan cloud computing evaluation project, Argonne has been transitioning the system from a testbed into a production-grade system and training more researchers in how to best exploit its capabilities. Another major focus is closing the performance gap between traditional HPC platforms and the OpenStack platform, a large-scale, open source cloud computing initiative.

September 10, 2012
Formal Analysis of MPI-based Parallel Programs

Formal methods can play an important role in debugging and verifying MPI applications. Here, we describe existing techniques, including their pros and cons, and why they have value beyond MPI, addressing the general needs of future concurrency application developers who will inevitably use low-level concurrency APIs.

December 15, 2011
Simulation of velocity distribution in a 19-pin wire-wrapped fuel bundle, computed using Nek5000 on Argonne Leadership Computing Facility's Intrepid. Image by Paul Fischer.
Meeting highlights applications of Nek5000 simulation code

Thirty researchers from around the world gathered for the first Nek5000 meeting, held at Argonne on December 9 and 10, 2010. The objective was to enable developers and users of Nek5000 to exchange information, address technical issues and share experiences in areas of common interest.

December 12, 2011
Birth of the Universe, Direct Numerical Simulations of Cosmological Reionization

In this video from SC11, Michael Norman (SDSC), Joseph Insley (ANL), and Rick Wagner (SDSC) describe a set of ground-breaking collaborative astrophysics simulations. Essentially, the visualizations depict the formation of the first galaxies, and what happened to the surrounding intergalactic gas when they lit up.

November 30, 2011