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We have collected presentations from IXPUG workshops, annual meetings, and BOF sessions, and made them accessible here to view or download. You may search by event, keyword, science domain or author’s name. The database will be updated as new talks are made available.
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Search ResultShowing 1 - 10 of 360 Results
Image and data-parallel rendering across multiple nodes on HPC system is widely used in visualization to provide higher framerates, support large datasets, and render data in situ, Specifically for in situ, reducing bottlenecks incurred by the visualization and compositing tasks is of key concern to reduce the overall simulation run time, while for general interactive visualization improving rendering performance, and thus interactivity, is always desirable. In this talk, Will Usher will present our work on an asynchronous image processing and compositing framework for multi-node rendering in OSPRay, dubbed the Distributed FrameBuffer. We demonstrate that this approach achieves performance superior to the state of the art for common use cases, while providing the flexibility to support a wide range of parallel rendering algorithms and data distribution. By building on this framework, we have extended OSPRay with a data-distributed API, enabling its use in data-distributed and in situ visualization applications. Will Usher will cover our approach to developing this framework, performance considerations, and use cases and examples of the new data-distributed API in OSPRay.
Keyword(s): Xeon Phi,Xeon,Data Parallel,Parallel Rendering,FrameBuffer,In Situ Visualization
Author(s): Ingo Wald, Will Usher, Jefferson Amstutz, Johannes Gunther, Carson Brownlee, Valerio Pascucci Video(s): Webinar recording (begins at 2:50) Read more | |This talk will help you learn how Lanczos iterative algorithm can be extended with a parallel computing to solve highly degenerated systems. The talk will address the performance benefits of the core numerical operations in Lanczos iteration, which can be driven with manycore processors (KNL) compared to the heterogeneous systems containing PCI-E and-in devices. This work will also demonstrate an extremely large-scale benchmark (~2500 KNL computing nodes) that has been recently performed with KISTI-5 (NURION) HPC resource. As this talk covers the numerical details of the algorithm, it would be also quite instructive to those who consider KNL system to solve large-scale eigenvalue problems.
Keyword(s): Xeon Phi,MPI,OpenMP
Author(s): Hoon Ryu KISTI Video(s): Webinar recording Read more | |This talk will present benchmark data for IMDT, which is a new generation of Software-defined Memory (SDM) based on Intel ScaleMP collaboration and using 3D XPoint based Intel SSD called Optane. IMDT performance was studied using synthetic benchmarks, scientific kernels and applications. We chose these benchmarks to represent different patterns for computation and accessing data on disks and memory. To put performance of IMDT in comparison, we used two memory configurations: hybrid IMDT DDR4/Optane and DDR4 only system. The performance was measured as percentage of used memory and analyzed in detail. We found that for some applications DDR4/Optane hybrid configuration outperforms DDR4 setup by up to 20%.
Keyword(s): 3DXPoint,Optane,MKL
Author(s): Vladimir Mironov Video(s): Webinar recording (begins at 5:35) Read more | |Vectorization is increasingly important to achieve high performance on modern hardware with SIMD instructions. Assembly of matrices and vectors in the finite element method, which is characterized by iterating a local assembly kernel over unstructured meshes, poses challenges to effective vectorization. Maintaining a user-friendly high-level interface with a suitable degree of abstraction while generating efficient, vectorized code for the finite element method is a challenge for numerical software systems and libraries. In this talk, we study the cross-element vectorization in the finite framework Firedrake and demonstrate the efficacy of such an approach by evaluating a wide range of matrix-free operators spanning different polynomial degrees and discretizations on two recent Intel CPUs using three mainstream compilers. Our experiments show that cross-element vectorization achieves 30% of theoretical peak performance for many examples of practical significance, and exceeds 50% for cases with high arithmetic intensities, with consistent speed-up over vectorization restricted to the local assembly kernels.
Keyword(s): Vectorization,algorithms,OpenMP,Xeon
Author(s): Tianjiao Sun, Lawrence Mitchell, David A. Ham, Paul H. J. Kelly, Kaushik Kulkami, Andreas Kloeckner Video(s): Webinar recording Read more | |Here an optimization strategy based on code modernization concept is proposed and applies to the global MASNUM surface wave model, which has been used in several operational forecasting systems and earth system models.
Keyword(s): masnum,wave model
Author(s): Zhenya Song Video(s): Optimization strategy for MASNUM surface wave model Read more | |We present a complementary physics based, unsupervised approach that exploits the causal nature of spatiotemporal data sets generated by local dynamics (e.g. hydrodynamic flows). We illustrate how novel patterns and coherent structures can be discovered in cellular automata and outline the path from them to climate data.
Keyword(s): unsupervised learning,parallel programming
Author(s): Adam Rupe, Karthik Kashinath, James Crutchfield, Ryan James, Prabhat Video(s): Project DisCo: Physics-based discovery of coherent structures in spatiotemporal systems Read more | |Our work proposes several optimization techniques to improve the performance of a wave propagation model provided by Petrobras, a multinational corporation in the petroleum industry.
Keyword(s): performance optimization,oil & gas
Author(s): Eduardo Cruz, Philippe Navaux Video(s): Improving Oil and Gas Extraction Simulation Performance using Intel® Xeon® and Xeon Phi™ Architectures Read more | |The Energy Exascale Earth System Model (E3SM) is one of the top users of resources at NERSC, of which the Model for Prediction Across Scales - Ocean Core (MPAS-O) is a significant component, composed of 800,000 lines of Fortran and work by 50 contributors. When MPAS-O is migrated from the previous generation NERSC production system, Edison which hosts Ivy Bridge processors to the newer Knights Landing based Cori system, severe performance loss and scaling bottlenecks result. Performance analysis was used to reject a number of possible causes of this effect including load imbalance, cache behavior, and vectorization efficiency. It was found that a lower bound on the number of simulation cells mapped to an MPI rank combined with MPAS framework overhead caused by serialized thread structure is the overwhelming contributor to MPAS performance loss on Xeon Phi systems. Two framework optimizations which remove excessive thread barriers and recycle communications data structures have been incorporated into the E3SM master codebase for a 15% speed improvement when running MPAS-O at production scale on Xeon Phi processors.
Keyword(s): MPI,Climate and weather
Author(s): William Arndt Video(s): Optimization of the Model for Prediction Across Scales: Ocean Core targeting Production Scale Use of Knights Landing Processor Architecture Read more | |This work significantly improves the OpenMP threading performance of Quantum ESRESSO (QE) on Xeon and Xeon Phi processors.
Keyword(s): OpenMP,Density functional theory,3D FFT
Author(s): Ye Luo Video(s): Improved threading performance of Quantum ESPRESSO Read more | |With DM-HEOM, we developed the first Distributed Memory implementation of the HEOM method. In this talk we describe our interdisciplinary development workflow and provide guidelines and experiences for designing distributed, performance-portable HPC applications.
Keyword(s): HEOM,performance portability,OpenCL,MPI
Author(s): Matthias Noack Video(s): DM-HEOM: A Case Study in Performance Portability Read more | |