Michael Papka

Northern Illinois University, Computer Science, Faculty Member

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Papers by Michael Papka

Interacting with Scientific Visualizations: User-Interface Tools within Spatially Immersive Displays

Mathematics in Computer Science, 2000

. User interfaces represent a doorknob to computer applications and directlyrelate to the usabili... more . User interfaces represent a doorknob to computer applications and directlyrelate to the usability of a given application. The desktop WIMP interfacehas been developed and refined over the past 15 years and works well for thedesktop environment. The question is, What does one do in the case of today&amp;amp;#39;sthree-dimensional immersive environments? Does one translate the desktop toolsto the 3D space,

Quantitative modeling of power performance tradeoffs on extreme scale systems

Journal of Parallel and Distributed Computing, 2015

ABSTRACT As high performance computing (HPC) continues to grow in scale and complexity, energy be... more ABSTRACT As high performance computing (HPC) continues to grow in scale and complexity, energy becomes a critical constraint in the race to exascale computing. The days of “performance at all cost” are coming to an end. While performance is still a major objective, future HPC will have to deliver desired performance under the energy constraint. Among various power management methods, power capping is a widely used approach. Unfortunately, the impact of power capping on system performance, user jobs, and power-performance efficiency are not well studied due to many interfering factors imposed by system workload and configurations. To fully understand power management in extreme scale systems with a fixed power budget, we introduce a power-performance modeling tool named PuPPET (Power Performance PETri net). Unlike the traditional performance modeling approaches such as analytical methods or trace-based simulators, we explore a new approach–colored Petri nets–for the design of PuPPET. PuPPET is fast and extensible for navigating through different configurations. More importantly, it can scale to hundreds of thousands of processor cores and at the same time provide high levels of modeling accuracy. We validate PuPPET by using system traces (i.e., workload log and power data) collected from the production 48-rack IBM Blue Gene/Q supercomputer at Argonne National Laboratory. Our trace-based validation demonstrates that PuPPET is capable of modeling the dynamic execution of parallel jobs on the machine by providing an accurate approximation of energy consumption. In addition, we present two case studies of using PuPPET to study power-performance tradeoffs on petascale systems.

Electronic poster

Proceedings of the 2011 companion on High Performance Computing Networking, Storage and Analysis Companion - SC '11 Companion, 2011

ABSTRACT Accurately modeling many physical and biological systems requires simulating at multiple... more ABSTRACT Accurately modeling many physical and biological systems requires simulating at multiple scales. This results in large and heterogeneous data sets on vastly differing scales, both physical and temporal. Here we look specifically at blood flow in a patient-specific cerebrovasculature with a brain aneurysm, and analyze the interaction of platelets with the arterial walls that lead to thrombus formation.

Papka: “The design of network services for advanced collaborative environments

Advanced collaborative environments are one of the most important tools for interacting with coll... more Advanced collaborative environments are one of the most important tools for interacting with colleagues distributed around the world. However, heterogeneous characteristics such as network transfer rates, computational abilities, and hierarchical systems make the seamless integration of distributed resources a challenge. This paper proposes the design of two network services, Collaborative Environment Network Service Architecture (CENSA) and Infrastructure (CENSI), that embed network services into various systems intelligently and elastically and support seamless advanced collaborative environments. We present a multilayered model for their current utilization and future development. We describe various network services and discuss some open issues.

Virtual Reality Visualization of Accelerator Magnets

: We describe the use of the CAVE virtual reality visualization environment as an aid to the desi... more : We describe the use of the CAVE virtual reality visualization environment as an aid to the design of accelerator magnets. We have modeled an elliptical multipole wiggler magnet being designed for use at the Advanced Photon Source at Argonne National Laboratory. The CAVE environment allows us to explore and interact with the 3-D visualization of the magnet. Capabilities include changing the number of periods of the magnet displayed, changing the icons used for displaying the magnetic field, and changing the current in the electromagnet and observing the effect on the magnetic field and particle beam trajectory through the field. This work was supported by the Office of Scientific Computing, U.S. Department of Energy, under Contract W-31-109Eng -38. y This work was supported by the Office of Basic Energy Science, U.S. Department of Energy, under Contract W-31-109Eng -38. 1 Introduction Electromagnetic field analysis and design are more difficult in three dimensions than in two, b...

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