17087246
Efficiently building on-line tools for distributed heterogeneous environments
Software development is getting more and more complex, especially within distributed middleware-based environments. A major drawback during the overall software development process is the lack of on-line tools, i.e. tools applied as soon as there is a running prototype of an application. The MIMO MIddleware MOnitor provides a solution to this problem by implementing a framework for an efficient development of on-line tools. 
 
This paper presents a methodology for developing on-line tools with MIMO. As an example scenario, we choose a distributed medical image reconstruction application, which represents a test case with high performance requirements. Our distributed, CORBA-based application is instrumented for being observed with MIMO and related tools. Additionally, load balancing mechanisms are integrated for further performance improvements. 
 
As a result, we obtain an integrated tool environment for observing and steering the image reconstruction application. By using our rapid tool development process, the integration of on-line tools shows to be very convenient and enables an efficient tool deployment.
280666
RAxML-OMP: An Efficient Program for Phylogenetic Inference on SMPs
Inference of phylogenetic trees comprising hundreds or even thousands of organisms based on the Maximum Likelihood (ML) method is computationally extremely intensive. In order to accelerate computations we implemented RAxML-OMP, an efficient OpenMP-parallelization for Symmetric Multi-Processing machines (SMPs) based on the sequential program RAxML-V (Randomized Axelerated Maximum Likelihood). RAxML-V is a program for inference of evolutionary trees based upon the ML method and incorporates several advanced search algorithms like fast hill-climbing and simulated annealing. We assess performance of RAxML-OMP on the widely used Intel Xeon, Intel Itanium, and AMD Opteron architectures. RAxML-OMP scales particularly well on the AMD Opteron architecture and achieves even super-linear speedups for large datasets (with a length ≥ 5.000 base pairs) due to improved cache-efficiency and data locality. RAxML-OMP is freely available as open source code.
41163680
PATOP for Performance Tuning of Parallel Programs
This article describes properties, design and implementation of PATOP (Performance Analysis TOol for Parallel systems). It was developed as part of the TOPSYS project at Technical University of Munich. Its purpose is to make the efficiency of parallel programs visible, in order to find performance bottlenecks (performance debugging). PATOP was implemented on the IPSC/2 Hypercube. It supports measurements on the system's hardware structure (whole system, processor nodes, communication links) and on objects of the programming model (Task, Mailbox, Semaphore). Measurements can be started and evaluated during program execution (on-line). User interaction is menu driven and measurement results are displayed graphically.
6349430
A flat, timing-driven design system for a high-performance CMOS processor chipset
We describe the methodology used for the design of the CMOS processor chipset used in the IBM S/390 Parallel Enterprise Server-Generation 3. The majority of the logic is implemented by standard cell elements placed and routed flat, using timing-driven techniques. The result is a globally optimized solution without artificial floorplan boundaries. We show that the density in terms of transistors per mm/sup 2/ is comparable to the most advanced custom designs and that the impact of interconnect delay on the cycle time is very small. Compared to custom design, this approach offers excellent turn-around-time and considerably reduces overall effort.
38935360
Analyzing Metadata Performance in Distributed File Systems
The performance of metadata processing in large distributed file systems currently presents larger challenges than scaling of data throughput. The paper presents a novel, distributed benchmark called DMetabench for measuring the performance of metadata operations (e.g. file creation). DMetabench runs in environments with potentially thousands of nodes and allows an assessment of the scalability of metadata operations. Additionally, precise run-time performance data is preserved which allows for a better understanding of performance artifacts. Validation results from production file systems at the Leibniz Supercomputing Centre (LRZ) are provided and discussed. Possible applications of knowledge about metadata performance scaling include the choice of an optimal parallelization strategy for metadata-itensive workload in a specific runtime environment.
32469612
Editorial for the ISC’10 Scientific Sessions Proceedings
The International Supercomputing Conference started in 1986 as the “Supercomputer Seminar” organized by Prof. Hans Meuer, then director of the computer center and professor for computer science at the Universitat Mannheim (Germany). Since these early days the annual conference became a major international event in the HPC community. As the conference grew bigger, it moved from Mannheim over Heidelberg and Dresden to Hamburg. In 2010 the conference will celebrate its 25th birthday! About 2,000 attendees and more than 140 exhibitors from over 45 countries are expected to attend, turning ISC’10 into a powerful and memorable event. Over the years we decided to strengthen the scientific part of the conference and present selected talks on relevant research results in the field of HPC. These scientific sessions started in 2007 as a separate day preceding the conference. Slides and accompanying papers were made available via the conference web site. Now, the scientific sessions evolved into an integral part of the conference, being scheduled in the afternoon of the first day. The call for participation was issued in winter 2009 inviting researchers and developers to submit latest results of their work as full research papers to the program committee of the scientific sessions. Altogether we received 25 submissions from authors all over the world. In a peer-reviewing process with an international committee we selected the best 13 papers for publication in this journal and for presentation during the scientific sessions of the conference.