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CHANGELOG.md

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Changelog

All notable changes to this project will be documented in this file.

Unreleased

  • None

[v4.0] - 2021-12-22

Added

  • New implementation using the C++ parallel STL (C++17).
  • New implementation using C++20 range factories and for_each_n.
  • Compiler options for OpenMP and OpenACC GNU offloading to NVIDIA and AMD.
  • Compiler options for Arm Clang added to OpenMP and Kokkos.
  • Kokkos 3 build system (No code changes made).
  • SYCL build rules for ComputeCpp, DPCPP and HipSYCL.
  • Support for CUDA Managed Memory and Page Fault memory.
  • Added nstream kernel from PRK with associate command line option.
  • CMake build system added for all models.
  • SYCL device check for FP64 support.
  • New implementations: TBB, Thrust, Julia, Scala, Java.
  • Compiler options for Fujitsu added to OpenMP.

Changed

  • Default branch renamed from master to main.
  • Array size is now a signed integer, which follows best practice.
  • Driver now delays allocating large checking vectors until after computation has finished.
  • Use cl::sycl::id parameters instead of cl::sycl::item.
  • Update local copy of OpenCL C++ header file.
  • Ensure correct SYCL queue constructor with explicit async_handler.
  • Use built in SYCL runtime device discovery.
  • Cray compiler OpenMP flags updated.
  • Clang compiler OpenMP flags corrected for NVIDIA target.
  • Reorder OpenCL objects in class so destructors are called in safe order.
  • Ensure all OpenCL kernels are present in destructor.
  • Unified run function in driver code to reduce code duplication, output should be uneffected.
  • Normalise sum result by expected value to help false negative errors.
  • HC version deprecated and moved to a legacy directory.
  • Update RAJA to v0.13.0 (w/ code changes as this is a source incompatible update).
  • Update SYCL version to SYCL 2020.

Removed

  • Pre-building of kernels in SYCL version to ensure compatibility with SYCL 1.2.1. Pre-building kernels is also not required, and shows no overhead as the first iteration is not timed.
  • OpenACC Cray compiler flags.
  • Build support for Kokkos 2.x (No code changes made).
  • All Makefiles; build system will now use CMake exclusively.

[v3.4] - 2019-04-10

Added

  • OpenACC flags to build for Power 9, Volta, Skylake and KNL.
  • Kokkos list CLI argument shows some information about which device will be used.
  • OpenMP GNU compiler now uses native target flag.
  • Support CSV output for Triad only running mode.
  • NEC and PGI compiler option for OpenMP version.
  • Option to calculate memory bandwidth in base 2 (MiB/s) rather than base 10 (MB/s).

Changed

  • Update SYCL implementation to SYCL 1.2.1 interface.
  • Output formatting of Kokkos implementation.
  • Capitalisation of Kokkos filenames.
  • Updated HIP implementation to new interface.
  • Use parallel loop instead of kernels for OpenACC.
  • OpenMP build for XL compiler uses -qarch=auto.

Removed

  • Superfluous OpenMP 4.5 map(to:) clauses on kernel target regions.
  • Kokkos namespace not used by default so the API is easier to spot.
  • Manual specification of Kokkos layout (DEVICE) as the Kokkos library sets this by default.

Fixed

  • Kokkos now compiles and links separately to fix complication with Kokkos 2.05.00.
  • Kokkos can now instantiate single and double precision.
  • OpenMP 4.5 map and reduction clause order to ensure reduction result copied back.
  • Potential race condition in SYCL code between unloading OpenCL library and device list deconstructor.

[v3.3] - 2017-12-04

Added

  • Add runtime option to run just the Triad kernel.
  • Add runtime option for CSV output of results.
  • ROCm HC implementation added for AMD GPUs.

Changed

  • Renamed project to BabelStream (from GPU-STREAM).
  • Update SYCL Makefile to use ComputeCpp path variables.
  • SYCL exceptions are now fatal, and are propagated to a runtime exception.

[v3.2] - 2017-04-06

Added

  • Build instructions for RAJA and Kokkos libraries.

Changed

  • Use RAJA and Kokkos internal iterator types instead of int.
  • Ensure RAJA pointers do not alias.
  • Align memory to 2MB pages in RAJA and OpenMP.
  • Updated Intel compiler flags for OpenMP, Kokkos and RAJA to ensure streaming stores.
  • CUDA Makefile now uses variables to set compiler and flags.
  • Use static shared memory for dot kernel in CUDA and HIP.

Fixed

  • Fix initialisation of b array bug in Kokkos implementation.

[v3.1] - 2017-02-25

Added

  • Dot kernel HIP implementation.

Changed

  • Build system overhauled from CMake to a series of Makefiles.

Deprecated

  • Android build instructions.

[v3.0] - 2017-01-30

Added

  • New Dot kernel added to the 4 standard kernels.

Changed

  • All model implementations now initialise and allocate their own arrays rather than copying from a master copy. This allows for better performance on NUMA architectures.
  • Version string definition moved from header to main file.
  • Combined OpenMP 3 and 4.5 implementations.
  • OpenMP 4.5 target implementation uses alloc instead of to.
  • Made SYCL indexing consistent.
  • Update SYCL CMake build to use ComputeCpp CE 0.1.1.

Fixed

  • OpenMP deconstructor now only frees GPU memory only on GPU build.
  • SYCL template specializations for float and double.

[v2.1] - 2016-10-21

Added

  • New HIP version added.
  • Results for v2.0 added.
  • Output of OpenCL kernel build log on failure.

Changed

  • Use globally defined scalar value.
  • Change scalar value to stop overflow.
  • Restructure results directory.
  • Change SYCL default work-group size.
  • CMake defaults to Release build.

Fixed

  • CUDA device name output string corrected.
  • Out of tree builds.

[v2.0] - 2016-06-30

Added

  • Implementations in OpenMP 4.5 OpenACC, RAJA, Kokkos and SYCL.
  • Copyright headers to source files.
  • Runtime option variables are printed out.
  • Device selection added to OpenCL and CUDA.

Changed

  • Major refactor to include multiple programming models. The change now uses C++ for driver code, with different models plugged in as classes which implement the STREAM kernels.
  • Starting values in the arrays to reduce floating point errors with high iteration counts.
  • Default array size now 2^25.
  • Default to 100 iterations instead of 10.
  • CUDA thread block size set via define rather than hardcoded value.
  • Require CUDA 7 for C++11 support.
  • OpenCL C++ header updated.

Fixed

  • Various CMake build fixes.
  • Require at least 2 iterations.

Removed

  • Warning message for single precision iterations.

[v1.1] - 2016-05-09

Added

  • HIP implementation and results.
  • Titan X and Fury X results.
  • Output of array sizes and other information at runtime.
  • Ability to set CUDA block sizes on command line.
  • Android build instructions.

Changed

  • Update OpenCL C++ header.
  • Requires CUDA 6.5 or above.
  • OpenCL uses Kernel Functor APIs instead of make_kernel API.

Fixed

  • Unsigned integer warnings.

[v0.9] - 2015-08-07

Initial public release of OpenCL and CUDA GPU-STREAM.