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InTheLoop | 11.28.2005

The Weekly Electronic Newsletter for Berkeley Lab Computing Sciences Employees

November 28, 2005

DOE's Lehman to Discuss "Large Science Project Experience at the DOE" on Dec. 1

Daniel Lehman, director of the Office of Project Assessment in DOE's Office of Science, will present a talk titled "Large Science Project Experience at the U.S. Department of Energy." Lehman will give his talk starting at 2 p.m. Thursday, Dec. 1, in the Bldg. 50 auditorium. Interested staff are invited to attend.

Journal Features Climate Modeling Articles by CRD's Chris Ding, Helen He

The International Journal of High Performance Computing Applications (IJHPCA) has dedicated its Fall 2005 issue to climate modeling, especially on the software design of the Community Climate System Model (CCSM). Among the contributing authors are CRD's Helen He and Chris Ding, who wrote an article on “Coupling Multicomponent Models with MPH on Distributed Memory Computer Architectures” and contributed to another on “CPL6: The New Extensible, High Performance Parallel Coupler for the Community Climate System Model.” The special issue of the journal can be found at http://hpc.sagepub.com/content/vol19/issue3/.

Many of the authors are currently collaborating on a SciDAC climate project about Collaborative Design and Development of CCSM. This is a multi-institutional effort involving the National Center for Atmospheric Research, NASA and Argonne, Berkeley, Los Alamos, Lawrence Livermore, Oak Ridge and Pacific Northwest national labs. The goal of the project is to provide U.S. researchers with state-of-the-art coupled climate simulation capabilities. CCSM modeling results are part of the U.S.' submission to the Intergovernmental Panel on Climate Change Fourth Assesment Report (IPCC AR4).

CRD's Brian Tierney Writes Article on Maximizing Network Throughput

Brian Tierney, a member of CRD's Distributed Systems Department, has built a strong track record in analyzing the performance of networks and distributed computing systems. His Netlogger toolkit allows users of distributed systems to analyze performance and locate bottlenecks which hamper the overall performance of a system. He recently shared his expertise in an article he wrote for OnLAMP.com. LAMP, an acronym used in Germany to define how MySQL is used in conjunction with Linux, Apache and either Perl, Python or PHP, led to the creation of OnLAMP.com, the open source Web platform.

Here's the intro to Brian's article:
“The other day my friend Bob came to me with a question. He'd written a Java program to copy 100 MB data files from his Windows XP computer at his office in Sunnyvale to a Linux server at his company's East Coast office in Reston, Va. He knew both offices had 100 Mbps Ethernet networks that connected over a 155 Mbps Virtual Private Network (VPN). When he measured the speed of the transfers, he found out that his files were transferring at less than 4 Mbps, and wondered if I had any idea why.

“I wrote this article to explain why this is the case, and what Bob needs to do to achieve the maximum network throughput. This article is aimed mainly at software developers. All too often software developers blame the network for poor performance, when in fact the problem is untuned software. However, there are times when the network is the problem. This article also explains some network troubleshooting tools that can give software developers the evidence needed to make network engineers take them seriously.”

Read the full story at http://www.onlamp.com/pub/a/onlamp/2005/11/17/tcp_tuning.html?page=1.

Dec. 1 Seminar by SGI to Discuss Visualization for Sciences

On Thursday, Dec 1, representatives from SGI will visit Berkeley Lab to share information about recent hardware and software visualization products. The one-hour seminar will be held from 12:30-1:30 p.m. in 50B-4205. Sponsored by the Lab's Visualization Group, this seminar is open to any Lab staff using or interested in scientific visualization hardware and software technology. Please feel free to bring your lunch to the seminar.

ACM Transactions Issue Dedicated to DOE's ACTS Collection of HPC Tools

The Association of Computing Machinery dedicated the September 2005 issue of Transactions on Mathematical Software (ACM TOMS) to the ACTS Collection. The DOE Advanced CompuTational Software (ACTS) Collection (http://acts.nersc.gov) comprises a set of tools mainly developed at the DOE laboratories. These software tools aim to simplify the solution of common and important computational problems and have substantially benefited a wide range of scientific and industrial applications.

The ACTS Collection is maintained by Osni Marques and Tony Drummond of CRD's Scientific Computing Group. They also served as guest editors-in-chief for the special issue, as well as authors of two articles in the journal. Sherry Li of the Scientific Computing Group also contributed “An Overview of SuperLU: Algorithms, Implementation, and User Interface.”

The ACM TOMS table of contents and links to the articles can be found at http://www.acm.org/toms/Current.html#v31n3.

Reminder: Monthly Employees Need to Enter Time in LETS by Noon Today

All monthly reporting employees are reminded that they need to enter their time in LETS by 12 noon today (Monday, Nov. 28). Also, all approvers need to review and approved entered time by noon today. The Lab's time reporting practices are coming under increasing scrutiny and better compliance with reporting deadlines is needed to avoid potential problems.

NERSC's Mass Storage Group Seeking Systems Engineer

NERSC's Mass Storage Group has posted an opening for a computer systems engineer. The successful candidate will “work as a member of the NERSC Mass Storage Group under the direction of the MSG Group Lead. Provide 24x7 production support for highly reliable, high performance, large capacity archival storage systems which are utilized by DOE worldwide research scientists.”

More detailed information about the position can be found at http://www.lbl.gov/CS/Careers/OpenPositions/NE18520.html.

About Computing Sciences at Berkeley Lab

The Lawrence Berkeley National Laboratory (Berkeley Lab) Computing Sciences organization provides the computing and networking resources and expertise critical to advancing the Department of Energy's research missions: developing new energy sources, improving energy efficiency, developing new materials and increasing our understanding of ourselves, our world and our universe.

ESnet, the Energy Sciences Network, provides the high-bandwidth, reliable connections that link scientists at 40 DOE research sites to each other and to experimental facilities and supercomputing centers around the country. The National Energy Research Scientific Computing Center (NERSC) powers the discoveries of 7,000-plus scientists at national laboratories and universities, including those at Berkeley Lab's Computational Research Division (CRD). CRD conducts research and development in mathematical modeling and simulation, algorithm design, data storage, management and analysis, computer system architecture and high-performance software implementation. NERSC and ESnet are Department of Energy Office of Science User Facilities.

Lawrence Berkeley National Laboratory addresses the world's most urgent scientific challenges by advancing sustainable energy, protecting human health, creating new materials, and revealing the origin and fate of the universe. Founded in 1931, Berkeley Lab's scientific expertise has been recognized with 13 Nobel prizes. The University of California manages Berkeley Lab for the DOE’s Office of Science.

DOE’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, please visit science.energy.gov.