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    • 2017-08-24 13:05:11
    • Article ID: 680037

    Big Bang – The Movie

    • Credit: Lindsey Bleem, Nan Li, and the HACC team/Argonne National Laboratory; Mike Gladders/University of Chicago

      A simulated sky image of galaxies produced by running Argonne-developed high-performance computing codes and then running a galaxy formation model. Argonne has collaborated with the University of Illinois, teaming up two supercomputers to perform simulation and data analysis of extremely large-scale, computationally intensive models of the universe.

    • Credit: Joe Insley and Silvio Rizzi/Argonne National Laboratory.

      Dark matter halo distribution from the Outer Rim simulation carried out on 32 racks of Mira with the Hardware/Hybrid Accelerated Cosmology Code (HACC). Shown is the full simulation volume with halos above a certain mass cut. The halos are colored by mass, the heavier halos are shown in red. These halos host the galaxies that we observe with large telescopes.

    If you have ever had to wait those agonizing minutes in front of a computer for a movie or large file to load, you’ll likely sympathize with the plight of cosmologists at the U.S. Department of Energy’s (DOE) Argonne National Laboratory. But instead of watching TV dramas, they are trying to transfer, as fast and as accurately as possible, the huge amounts of data that make up movies of the universe – computationally demanding and highly intricate simulations of how our cosmos evolved after the Big Bang.

    In a new approach to enable scientific breakthroughs, researchers linked together supercomputers at the Argonne Leadership Computing Facility (ALCF) and at the National Center for Supercomputing Applications (NCSA) at the University of Illinois at Urbana-Champaign (UI). This link enabled scientists to transfer massive amounts of data and to run two different types of demanding computations in a coordinated fashion – referred to technically as a workflow.

    “We talk about building the ‘universe in the lab,’ and simulations are a huge component of that.” - Katrin Heitmann, Argonne cosmologist

    What distinguishes the new work from typical workflows is the scale of the computation, the associated data generation and transfer and the scale and complexity of the final analysis. Researchers also tapped the unique capabilities of each supercomputer: They performed cosmological simulations on the ALCF’s Mira supercomputer, and then sent huge quantities of data to UI’s Blue Waters, which is better suited to perform the required data analysis tasks because of its processing power and memory balance.

    For cosmology, observations of the sky and computational simulations go hand in hand, as each informs the other. Cosmological surveys are becoming ever more complex as telescopes reach deeper into space and time, mapping out the distributions of galaxies at farther and farther distances, at earlier epochs of the evolution of the universe.

    The very nature of cosmology precludes carrying out controlled lab experiments, so scientists rely instead on simulations to provide a unique way to create a virtual cosmological laboratory. “The simulations that we run are a backbone for the different kinds of science that can be done experimentally, such as the large-scale experiments at different telescope facilities around the world,” said Argonne cosmologist Katrin Heitmann. “We talk about building the ‘universe in the lab,’ and simulations are a huge component of that.”

    Not just any computer is up to the immense challenge of generating and dealing with datasets that can exceed many petabytes a day, according to Heitmann. “You really need high-performance supercomputers that are capable of not only capturing the dynamics of trillions of different particles, but also doing exhaustive analysis on the simulated data,” she said. “And sometimes, it’s advantageous to run the simulation and do the analysis on different machines.”

    Typically, cosmological simulations can only output a fraction of the frames of the computational movie as it is running because of data storage restrictions. In this case, Argonne sent every data frame to NCSA as soon it was generated, allowing Heitmann and her team to greatly reduce the storage demands on the ALCF file system. “You want to keep as much data around as possible,” Heitmann said. “In order to do that, you need a whole computational ecosystem to come together: the fast data transfer, having a good place to ultimately store that data and being able to automate the whole process.”

    In particular, Argonne transferred the data produced immediately to Blue Waters for analysis. The first challenge was to set up the transfer to sustain the bandwidth of one petabyte per day.

    Once Blue Waters performed the first pass of data analysis, it reduced the raw data – with high fidelity – into a manageable size. At that point, researchers sent the data to a distributed repository at Argonne, the Oak Ridge Leadership Computing Facility at Oak Ridge National Laboratory and the National Energy Research Scientific Computing Center (NERSC) at Lawrence Berkeley National Laboratory. Cosmologists can access and further analyze the data through a system built by researchers in Argonne’s Mathematics and Computer Science Division in collaboration with Argonne’s High Energy Physics Division.

    Argonne and University of Illinois built one such central repository on the Supercomputing ’16 conference exhibition floor in November 2016, with memory units supplied by DDN Storage. The data moved over 1,400 miles to the conference’s SciNet network. The link between the computers used high-speed networking through the Department of Energy’s Energy Science Network (ESnet). Researchers sought, in part, to take full advantage of the fast SciNET infrastructure to do real science; typically it is used for demonstrations of technology rather than solving real scientific problems.

    “External data movement at high speeds significantly impacts a supercomputer’s performance,” said Brandon George, systems engineer at DDN Storage. “Our solution addresses that issue by building a self-contained data transfer node with its own high-performance storage that takes in a supercomputer’s results and the responsibility for subsequent data transfers of said results, leaving supercomputer resources free to do their work more efficiently.”

    The full experiment ran successfully for 24 hours without interruption and led to a valuable new cosmological data set that Heitmann and other researchers started to analyze on the SC16 show floor.

    Argonne senior computer scientist Franck Cappello, who led the effort, likened the software workflow that the team developed to accomplish these goals to an orchestra. In this “orchestra,” Cappello said, the software connects individual sections, or computational resources, to make a richer, more complex sound.

    He added that his collaborators hope to improve the performance of the software to make the production and analysis of extreme-scale scientific data more accessible. “The SWIFT workflow environment and the Globus file transfer service were critical technologies to provide the effective and reliable orchestration and the communication performance that were required by the experiment,” Cappello said.

    “The idea is to have data centers like we have for the commercial cloud. They will hold scientific data and will allow many more people to access and analyze this data, and develop a better understanding of what they’re investigating,” said Cappello, who also holds an affiliate position at NCSA and serves as director of the international Joint Laboratory on Extreme Scale Computing, based in Illinois. “In this case, the focus was cosmology and the universe. But this approach can aid scientists in other fields in reaching their data just as well.”

    Argonne computer scientist Rajkumar Kettimuthu and David Wheeler, lead network engineer at NCSA, were instrumental in establishing the configuration that actually reached this performance. Maxine Brown from University of Illinois provided the Sage environment to display the analysis result at extreme resolution. Justin Wozniak from Argonne developed the whole workflow environment using SWIFT to orchestrate and perform all operations.

    The Argonne Leadership Computing Facility, the Oak Ridge Leadership Computing Facility, the Energy Science Network and the National Energy Research Scientific Computing Center are DOE Office of Science User Facilities. Blue Waters is the largest leadership-class supercomputer funded by the National Science Foundation. Part of this work was funded by DOE’s Office of Science.

    The National Center for Supercomputing Applications (NCSA) at the University of Illinois at Urbana-Champaign provides supercomputing and advanced digital resources for the nation’s science enterprise. At NCSA, University of Illinois faculty, staff, students, and collaborators from around the globe use advanced digital resources to address research grand challenges for the benefit of science and society. NCSA has been advancing one third of the Fortune 50 for more than 30 years by bringing industry, researchers, and students together to solve grand challenges at rapid speed and scale.

    The National Science Foundation (NSF) is an independent federal agency that supports fundamental research and education across all fields of science and engineering. In fiscal year (FY) 2016, its budget is $7.5 billion. NSF funds reach all 50 states through grants to nearly 2,000 colleges, universities and other institutions. Each year, NSF receives more than 48,000 competitive proposals for funding and makes about 12,000 new funding awards. NSF also awards about $626 million in professional and service contracts yearly.

    Argonne National Laboratory seeks solutions to pressing national problems in science and technology. The nation's first national laboratory, Argonne conducts leading-edge basic and applied scientific research in virtually every scientific discipline. Argonne researchers work closely with researchers from hundreds of companies, universities, and federal, state and municipal agencies to help them solve their specific problems, advance America's scientific leadership and prepare the nation for a better future. With employees from more than 60 nations, Argonne is managed by UChicago Argonne, LLC for the U.S. Department of Energy's Office of Science.

    The U.S. Department of Energy's Office of Science is the single largest supporter of basic research in the physical sciences in the United States and is working to address some of the most pressing challenges of our time. For more information, visit the Office of Science website.

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