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InTheLoop | 06.02.2014

June 2, 2014

Confirmed: Stellar Behemoth Self-Destructs in Type IIb Supernova

For the first time ever, astronomers have direct confirmation that a Wolf-Rayet star—sitting 360 million light years away in the Bootes constellation—died in a violent explosion known as a Type IIb supernova. Using the iPTF pipeline, researchers caught supernova SN 2013cu within hours of its explosion. These observations are providing valuable insights into the life and death of the progenitor Wolf-Rayet. These stars are interesting because they enrich galaxies with the heavy chemical elements that eventually become the building blocks for planets and life.  »Read more

Multidimensional Image Processing and Analysis in R

An esoteric, open-source programming language—called R—could pave the way for open science. Thousands of scientists are participating in the R development community, including  CRD's Talita Perciano. As a student, she contributed one of the first image-processing tools—called R Image Processing Analysis (RIPA)—to the community. Now with big science datasets in mind, she’s updated the existing tool with improved features for complex data analysis. »Read more.

CS's Jon Bashor Honored by Albany High for Outreach Efforts

Computing Sciences Communications Manager Jon Bashor was recognized by the Albany Unified School District Board of Education as a volunteer of the year at Albany High School. In presenting the award, Albany High Principal Ted Barone cited Bashor's support for the school's annual Career Day and Job Shadow Day events. For the past six years, Bashor has recruited Lab staff to serve as Career Day mentors for students interested in careers in math, science and engineering, placing up to a dozen students at Berkeley Lab each year. He has also recruited lab staff to speak at the annual Career Day at the high school. The award was presented at the May 27 meeting of the Albany Board of Education, at which board member Patricia Low noted that her own son had spent Career Day at Berkeley Lab and was very enthusiastic about the experience.

Thursday: NUG Monthly Teleconference

The monthly NERSC Users Group teleconference/webinar will be held at 11 a.m. PDT on Thursday, June 5. All NERSC users are invited to attend.The agenda includes NERSC's move to its new building at Berkeley Lab; Dirac, Carver, and Hopper timelines and plan; and the NERSC Exascale Science Applications Program.

To attend via web conference,

  1. Visit https://nersc-training.webex.com/
  2. Enter event number: 660 957 926
  3. Enter event password: edison

Dial-in information for audio portion only (required to speak)
Phone Number: +1 866-740-1260
PIN: 4866820

Contact Richard Gerber with questions.

This Week's CS Seminars

»CS Seminars Calendar

Legion: Programming Distributed Heterogeneous Architectures with Logical Regions

Monday,  June 2, 11am – 12pm, Bldg. 50A, Room 5132

Michael Bauer Department of Computer Science Stanford University (http://www.stanford.edu/~mebauer/)

Modern supercomputers now encompass both heterogeneous processors and deep, complex memory hierarchies. Programming these machines currently requires expertise in an eclectic collection of tools (MPI, OpenMP, CUDA, etc.) that primarily focus on describing parallelism while placing the burden of data movement on the programmer. Legion is an alternative approach that provides extensive support for describing the structure of program data through logical regions. Logical regions can be dynamically partitioned into sub-regions giving applications an explicit mechanism for directly conveying information about locality and independence to the Legion runtime. Using this information, Legion automatically extracts task parallelism and orchestrates data movement through the memory hierarchy. Time permitting, we will discuss results from several applications including a port of S3D, a production combustion simulation running on Titan, the Department of Energy's current flagship supercomputer.

Introducing the Cori System, NERSC's next Supercomputer

Wednesday, June 4,10:30am – 12pm, Bldg. 50-Auditorium

The NERSC-8 technical team: Katie Antypas, Nick Wright, Nick Cardo, Matt Cordery, Allie Andrews, Harvey Wasserman

NERSC has announced its next large supercomputing system, Cori, a Cray XE system featuring the Intel Knights Landing manycore processor. In this presentation the NERSC-8 team will give an overview of the Cori system architecture, Knights Landing processor, programming model, and application readiness plans. We will also explain how CRD researchers and other Lab scientists can apply for early access to prototype hardware and receive code optimization support from NERSC, Cray and Intel resources.

A Proposal for a New Top500 Metric

Wednesday, June 4, 2014, 3pm - 4pm, Bldg. 50B, Room 4205

Mark Adams, Applied Numerical Algorithms Group, Lawrence Berkeley National Laboratory

The High Performance Linpack (HPL) benchmark and associated Top-500 List has been a successful metric for ranking high performance computing systems. HPL became a broadly accepted representative for application performance when it came to prominence in the 1990s, but over time has become less reflective of the system performance metrics that matter to contemporary science and engineering applications as lower complexity algorithms have been developed as required for extreme scale computing. We propose a replacement for HPL that maintains many of its desirable qualities: a direct, non-iterative, solver for systems of linear algebraic equations. We define a high performance geometric multigrid (HPGMG) benchmark that provides a more balanced exercise of machine capabilities and a more accurate proxy to modern application requirements. Using HPGMG, we strive to create a benchmark for ranking systems that will promote system design improvements that are better aligned to real scientific application performance.