Topic: HPC Systems and Software

Highlights include complex simulation codes, uncertainty quantification, discrete event simulation, and the Unify file system.

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A new software model helps move million-line codes to various hardware architectures by automating data movement in unique ways.

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Sphinx, an integrated parallel microbenchmark suite, consists of a harness for running performance tests and extensive tests of MPI, Pthreads and OpenMP.

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“If applications don’t read and write files in an efficient manner,” system software developer Elsa Gonsiorowski warns, “entire systems can crash.”

People Highlight

Highlights include the HYPRE library, recent data science efforts, the IDEALS project, and the latest on the Exascale Computing Project.

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Apollo, an auto-tuning extension of RAJA, improves performance portability in adaptive mesh refinement, multi-physics, and hydrodynamics codes via machine learning classifiers.

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Large Linux data centers require flexible system management. At Livermore Computing, we are committed to supporting our Linux ecosystem at the high end of commodity computing.

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This project's techniques reduce bandwidth requirements for large unstructured data by making use of data compression and optimizing the layout of the data for better locality and cache reuse.

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Researchers are developing a standardized and optimized operating system and software for deployment across Linux clusters to enable HPC at a reduced cost.

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LLNL’s Stack Trace Analysis Tool helps users quickly identify errors in code running on today’s largest machines.

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ROSE, an open-source project maintained by Livermore researchers, provides easy access to complex, automated compiler technology and assistance.

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Livermore computer scientists have helped create a flexible framework that aids programmers in creating source code that can be used effectively on multiple hardware architectures.

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LLNL computer scientists use machine learning to model and characterize the performance and ultimately accelerate the development of adaptive applications.

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Livermore Computing staff is enhancing the high-speed InfiniBand data network used in many of its high performance computing and file systems.

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New platforms are improving big data computing on Livermore’s high performance computers.

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LLNL researchers are finding some factors are more important in determining HPC application performance than traditionally thought.

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Computer scientists are incorporating ZFS into their high performance parallel file systems for better performance and scalability.

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Spindle improves the library-loading performance of dynamically linked HPC applications by plugging into the system’s dynamic linker and intercepting its file operations.

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PnMPI is a thin, low-overhead wrapper library that is automatically generated from mpi.h file and that can be linked by default.

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Performance analysis of parallel scientific codes is difficult. The HAC model allows direct comparison of data across domains with data viz and analysis tools available in other domains.

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Fast Global File Status (FGFS) is an open-source package that provides scalable mechanisms and programming interfaces to retrieve global information of a file.

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MPI_T is an interface for tools introduced in the 3.0 version of MPI. The interface provides mechanisms for tools to access and set performance and control variables that are exposed by an MPI implementation.

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Cram lets you easily run many small MPI jobs within a single, large MPI job by splitting MPI_COMM_WORLD up into many small communicators to run each job in the cram file independently.

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libMSR provides a convenient interface to access Model Specific Registers and to allow tools to utilize their full functionality.

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