Month: June 2020

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High Performance Computing: The Power of Language

SPEAKER: Alan Edelman, Professor of Applied Mathematics at Massachusetts Institute of Technology | Member of MIT’s Computer Science & AI Laboratory | the Leader of the JuliaLab and Applied Computing Group at MIT | cofounder of Julia Computing Inc.

DATE&TIME: Thursday, June 4, 2020 at 4:00 PM CEST

 

ABSTRACT:
Julia is now being used for high performance computing for the important problems of today including climate change and Covid-19. We describe how language is making all the difference.

 

SPEAKER’S BIO:
Alan Edelman is a Professor of Applied Mathematics at MIT, is a member of MIT’s Computer Science & AI Laboratory, and is the leader of the JuliaLab and Applied Computing Group at MIT. He is also a cofounder of Julia Computing Inc. He works on numerical linear algebra, random matrix theory and parallel computing. He is a fellow of SIAM, IEEE, and the American Mathematial Society. He has won numerous prizes for his research, most recently in 2019 the Fernbach Prize from IEEE for innovation in high performance computing.

 

DATE&TIME: Thursday, June 4, 2020 at 4:00 PM CEST

 

PLEASE REGISTER AT:
https://supercomputingfrontiers.eu/2020/tickets/neijis7eekieshee/

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Release of MVAPICH2 2.3.4 GA and OSU Micro-Benchmarks (OMB) 5.6.3

The MVAPICH team is pleased to announce the release of MVAPICH2 2.3.4 GA and OSU Micro-Benchmarks (OMB) 5.6.3.

Features and enhancements for MVAPICH2 2.3.4 GA are as follows:

* Features and Enhancements (since 2.3.3):

  • Improved performance for small message collective operations
  • Improved performance for data transfers from/to non-contiguous buffers used by user-defined datatypes
  • Add custom API to identify if MVAPICH2 has in-built CUDA support
  • New API ‘MPIX_Query_cuda_support’ defined in mpi-ext.h
    • New macro ‘MPIX_CUDA_AWARE_SUPPORT’ defined in mpi-ext.h
  • Add support for MPI_REAL16 based reduction operations for Fortran programs
    • MPI_SUM, MPI_MAX, MPI_MIN, MPI_LAND, MPI_LOR, MPI_MINLOC, and MPI_MAXLOC
    • Thanks to Greg Lee@LLNL for the report and reproduced
    • Thanks to Hui Zhou@ANL for the initial patch
  • Add support to intercept aligned_alloc in ptmalloc
    • Thanks to Ye Luo @ANL for the report and the reproduced
  • Add support to enable fork safety in MVAPICH2 using environment variable
    • “MV2_SUPPORT_FORK_SAFETY”
  • Add support for user to modify QKEY using environment variable
    • “MV2_DEFAULT_QKEY”
  • Add multiple MPI_T PVARs and CVARs for point-to-point and collective operations
  • Enhanced point-to-point and collective tuning for AMD EPYC Rome, Frontera@TACC, Longhorn@TACC, Mayer@Sandia, Pitzer@OSC, Catalyst@EPCC, Summit@ORNL, Lassen@LLNL, and Sierra@LLNL systems
  • Give preference to CMA if LiMIC2 and CMA are enabled at the same time
  • Move -lmpi, -lmpicxx, and -lmpifort before other LDFLAGS in compiler wrappers like mpicc, mpicxx, mpif77, and mpif90
  • Allow passing flags to nvcc compiler through environment variable NVCCFLAGS
  • Display more meaningful error messages for InfiniBand asynchronous events
  • Add support for AMD Optimizing C/C++ (AOCC) compiler v2.1.0
  • Add support for GCC compiler v10.1.0
    • Requires setting FFLAGS=-fallow-argument-mismatch at configure time
  • Update to hwloc v2.2.0

 

* Bug Fixes (since 2.3.3):

  • Fix compilation issue with IBM XLC++ compilers and CUDA 10.2
  • Fix hangs with MPI_Get operations win UD-Hybrid mode
  • Initialize MPI3 data structures correctly to avoid random hangs caused by garbage values
  • Fix corner case with LiMIC2 and MPI3 one-sided operations
  • Add proper fallback and warning message when shared RMA window cannot be created
  • Fix race condition in calling mv2_get_path_rec_sl by introducing mutex
    • Thanks to Alexander Melnikov for reporting the issue and providing the patch
  • Fix mapping generation for the cases where hwloc returns zero on non-numa machines
    • Thanks to Honggang Li @Red Hat for the report and initial patch
  • Fix issues with InfiniBand registration cache and PGI20 compiler
  • Fix warnings raised by Coverity scans
    • Thanks to Honggang Li @Red Hat for the report
  • Fix bad baseptr address returned from MPI_Win_shared_query
    • Thanks to Adam Moody@LLNL for the report and discussion
  • Fix issues with HCA selection logic in heterogeneous multi-rail scenarios
  • Fix spelling mistake in error message
    • Thanks to Bill Long and Krishna Kandalla @Cray/HPE for the report
  • Fix compilation warnings and memory leaks

 

New features, enhancements and bug fixes for OSU Micro-Benchmarks

(OMB) 5.6.3 are listed here

* New Features & Enhancements (since v5.6.2)

  • Add support for benchmarking applications that use ‘fork’ system call

* osu_latency_mp

 

* Bug Fixes (since v5.6.2)

  • Fix compilation issue with IBM XLC++ compilers and CUDA 10.2
  • Allow passing flags to nvcc compiler
  • Fix issues in window creation with host-to-device and device-to-host transfers for one-sided tests

For downloading MVAPICH2 2.3.4 GA, OMB 5.6.3, and associated user guides, quick start guide, and accessing the SVN, please visit the following URL:

http://mvapich.cse.ohio-state.edu