Tiziana Di Matteo
Carnegie Mellon University
Extragalactic Astronomy and Cosmology
Jun 2017 - May 2018
Sep 2015 - Jul 2017
Sep 2013 - Sep 2016
Blue Waters Symposium 2016, Jun 13, 2016
Blue Waters Symposium 2015, May 11, 2015
Blue Waters Symposium 2014, May 13, 2014
Blue Waters Symposium 2017, May 17, 2017
International Astronomical Union XXIX General Assembly (2015); Honolulu, Hawai'i, U.S.A., Aug 6, 2015
International Astronomical Union XXIX General Assembly (2015); Honolulu, Hawai'i, U.S.A., Aug 7, 2015
May 12, 2017
Nestled on the outskirts of the University of Illinois at Urbana-Champaign campus — at the corner of Oak Street and St. Mary’s Road — is Blue Waters, a supercomputer that was first instituted as a result of a 2007 National Science Foundation grant and an initial $60 million investment from the State of Illinois. A report released this past week on the economic impact of this supercomputer — on the UIUC campus, its five surrounding counties, as well as nationwide spillover effects — puts a whole new meaning to the term “return on investment.”
May 2, 2017
If you’ve wondered about what, exactly, NCSA supercomputer Blue Waters has been doing since being fired up in 2013, a new report is full of details around workloads, CPU/GPU use patterns, memory and I/O issues, and a plethora of other metrics. Released in March, the study – Final Report: Workload Analysis of Blue Waters – provides a wealth of information around demand and performance. Blue Waters has supplied roughly 17.3 billion core hours to scientists to date.
Mar 31, 2017
A technical report analyzing use and performance of NCSA's Blue Waters supercomputer and all the scientific applications it has run—from its launch in April 2013, until September 2016—shows Blue Waters has spent the majority of its computing time solving large-scale scientific applications. These include projects like understanding the 160-million-atom flu virus capsid, or creating high resolution 3D maps of the Arctic from massive amounts of satellite data. The paper also shows many of these large applications could only be performed on Blue Waters. Blue Waters is housed at the National Center for Supercomputing Applications (NCSA) at the University of Illinois at Urbana-Champaign and is the largest leadership-class supercomputer funded by the National Science Foundation.
Aug 11, 2015
A new, large-scale computer simulation has shown for the first time that large disk galaxies, much like our own Milky Way, may have existed in the early days of the universe. The simulation, created by physicists at Carnegie Mellon University’s McWilliams Center for Cosmology and the University of California Berkeley, shows that the early universe —500 million years after the Big Bang — might have had more order and structure than previously thought. Their findings, which will be published in The Astrophysical Journal Letters, will help guide researchers using next-generation telescopes like the Wide Field Infrared Survey Telescope (WFIRST) and the James Webb Space Telescope (JWST) as they search the sky for evidence of the first galaxies.
Aug 5, 2015
What were galaxies like in the first 500 million years of the universe? According to simulations by Yu Feng (UC Berkeley) and collaborators, the earliest massive galaxies to form were mostly disk-shaped, rather than the compact clumps previously predicted. Current models for galaxy formation predict that small perturbations in the distribution of matter in the early universe collapsed to form very compact, irregular, clumpy first galaxies. Observations support this: the furthest out that we’ve spotted disk-shaped galaxies is at z=3, whereas the galaxies we’ve observed from earlier times — up to redshifts of z=8–10 — are very compact.
May 5, 2015
In this special guest feature, Dr. Stephen Perrenod writes that astrophysicists have completed one of the largest cosmological simulations ever on the Blue Waters supercomputer at NCSA. The largest high-redshift cosmological simulation of galaxy formation ever has been recently completed by a group of astrophysicists (Drs. Feng, Di-Matteo, Croft, Bird, and Battaglia) from the U.S. and the U.K. This tour-de-force simulation was performed on the Blue Waters Cray XE/XK system at NCSA and employed 648,000 cores. They utilized approximately 700 billion particles (!) to represent dark matter and ordinary matter and to create virtual galaxies inside the supercomputer. The authors, who represent Carnegie Mellon University, UC Berkeley, Princeton University, and the University of Sussex, have given their simulation the moniker BlueTides.