Foo's To Blame: Techniques For Mapping Performance Data To Program Variables

Traditional methods of performance analysis offer a code centric view, presenting performance data in terms of blocks of contiguous code (statement, basic block, loop, function, etc.). Existing data centric techniques allow various program properties to be mapped directly to variables. Our approach extends these data centric mappings. Just as code centric techniques allow lower level objects like source lines be mapped up to functions, our inclusive technique allows low level data centric operations like computations on scalars to be mapped up to complex data structures like those found in scientific frameworks. Our system utilizes static analysis to collect information about the program that can be combined with runtime information to perform data centric program analysis. By pushing most of the analysis to pre-run and post-mortem, we can minimize the amount of data collected at runtime. This allows us to perform less instrumentation and also minimizes program perturbation. It also allows us to collect information that would not be possible with existing techniques. We present two applications of this analysis. The first application of our analysis is targeted at mapping performance data to high level data structures with multiple levels of abstraction. We create extended data centric mappings, which we call variable blame, that relates data centric information to these variables. The second application is a method for mapping cache miss information to variables. Existing approaches for this analysis rely on explicit hardware support and extensive program instrumentation. By utilizing our analysis and applying software heuristics, we are able to lessen those requirements. We apply both of these analyses to applications and show what performance information can be provided by our analysis that can not currently be determined. We also discuss how we can use that information to improve program performance

Proceedings of the 40th Aerospace Mechanisms Symposium

The Aerospace Mechanisms Symposium (AMS) provides a unique forum for those active in the design, production and use of aerospace mechanisms. A major focus is the reporting of problems and solutions associated with the development and flight certification of new mechanisms. Organized by the Mechanisms Education Association, responsibility for hosting the AMS is shared by the National Aeronautics and Space Administration and Lockheed Martin Space Systems Company (LMSSC). Now in its 40th symposium, the AMS continues to be well attended, attracting participants from both the U.S. and abroad. The 40th AMS, hosted by the Kennedy Space Center (KSC) in Cocoa Beach, Florida, was held May 12, 13 and 14, 2010. During these three days, 38 papers were presented. Topics included gimbals and positioning mechanisms, CubeSats, actuators, Mars rovers, and Space Station mechanisms. Hardware displays during the supplier exhibit gave attendees an opportunity to meet with developers of current and future mechanism components. The use of trade names of manufacturers in this publication does not constitute an official endorsement of such products or manufacturers, either expressed or implied, by the National Aeronautics and Space Administratio

Knowledge and Management Models for Sustainable Growth

In the last years sustainability has become a topic of global concern and a key issue in the strategic agenda of both business organizations and public authorities and organisations. Significant changes in business landscape, the emergence of new technology, including social media, the pressure of new social concerns, have called into question established conceptualizations of competitiveness, wealth creation and growth. New and unaddressed set of issues regarding how private and public organisations manage and invest their resources to create sustainable value have brought to light. In particular the increasing focus on environmental and social themes has suggested new dimensions to be taken into account in the value creation dynamics, both at organisations and communities level. For companies the need of integrating corporate social and environmental responsibility issues into strategy and daily business operations, pose profound challenges, which, in turn, involve numerous processes and complex decisions influenced by many stakeholders. Facing these challenges calls for the creation, use and exploitation of new knowledge as well as the development of proper management models, approaches and tools aimed to contribute to the development and realization of environmentally and socially sustainable business strategies and practices