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Thrust v1.10.0 Release Notes

Release Date: 2020-09-16 // over 3 years ago

  • Summary

    Thrust 1.10.0 is the major release accompanying the NVIDIA HPC SDK 20.9 release. It drops support for C++03, GCC < 5, Clang < 6, and MSVC < 2017. It also overhauls CMake support. Finally, we now have a Code of Conduct for contributors: https://github.com/thrust/thrust/blob/main/CODE_OF_CONDUCT.md

    💥 Breaking Changes

    • 👍 C++03 is no longer supported.
    • 👍 GCC < 5, Clang < 6, and MSVC < 2017 are no longer supported.
    • C++11 is deprecated. Using this dialect will generate a compile-time warning. These warnings can be suppressed by defining THRUST_IGNORE_DEPRECATED_CPP_DIALECT or THRUST_IGNORE_DEPRECATED_CPP_11. Suppression is only a short term solution. We will be dropping support for C++11 in the near future.
    • Asynchronous algorithms now require C++14.
    • 👍 CMake < 3.15 is no longer supported.
    • 0️⃣ The default branch on GitHub is now called main.
    • Allocator and vector classes have been replaced with alias templates.

    🆕 New Features

    • ✅ #1159: CMake multi-config support, which allows multiple combinations of host and device systems to be built and tested at once. More details can be found here: https://github.com/thrust/thrust/blob/main/CONTRIBUTING.md#multi-config-cmake-options
    • 🔨 CMake refactoring:
      • Added install targets to CMake builds.
      • Added support for CUB tests and examples.
      • Thrust can be added to another CMake project by calling add_subdirectory with the Thrust source root (see #976).
        An example can be found here: https://github.com/thrust/thrust/blob/main/examples/cmake/add_subdir/CMakeLists.txt
      • CMake < 3.15 is no longer supported.
      • Dialects are now configured through target properties. A new THRUST_CPP_DIALECT option has been added for single config mode. Logic that modified CMAKE_CXX_STANDARD and CMAKE_CUDA_STANDARD has been eliminated.
      • Testing related CMake code has been moved to testing/CMakeLists.txt
      • Example related CMake code has been moved to examples/CMakeLists.txt
      • Header testing related CMake code has been moved to cmake/ThrustHeaderTesting.cmake
      • CUDA configuration CMake code has been moved to to cmake/ThrustCUDAConfig.cmake.
      • Now we explicitly include(cmake/*.cmake) files rather than searching CMAKE_MODULE_PATH - we only want to use the ones in the repo.
    • thrust::transform_input_output_iterator, a variant of transform iterator adapter that works as both an input iterator and an output iterator. The given input function is applied after reading from the wrapped iterator while the output function is applied before writing to the wrapped iterator. Thanks to Trevor Smith for this contribution.

    Other Enhancements

    • 📚 Contributor documentation: https://github.com/thrust/thrust/blob/main/CONTRIBUTING.md
    • Code of Conduct: https://github.com/thrust/thrust/blob/main/CODE_OF_CONDUCT.md. Thanks to Conor Hoekstra for this contribution.
    • 👌 Support for all combinations of host and device systems.
    • 👍 C++17 support.
    • #1221: Allocator and vector classes have been replaced with alias templates. Thanks to Michael Francis for this contribution.
    • #1186: Use placeholder expressions to simplify the definitions of a number of algorithms. Thanks to Michael Francis for this contribution.
    • #1170: More conforming semantics for scan algorithms:
      • Follow P0571's guidance regarding intermediate types.
      • https://wg21.link/P0571
      • The accumulator's type is now:
        • The type of the user-supplied initial value (if provided), or
        • The input iterator's value type if no initial value.
      • Follow C++ standard guidance for default binary operator type.
      • https://eel.is/c++draft/exclusive.scan#1
      • Thrust binary/unary functors now specialize a default void template parameter.
        Types are deduced and forwarded transparently.
      • Updated the scan's default binary operator to the new thrust::plus<> specialization.
      • The thrust::intermediate_type_from_function_and_iterators helper is no longer needed and has been removed.
    • #1255: Always use cudaStreamSynchronize instead of cudaDeviceSynchronize if the execution policy has a stream attached to it. Thanks to Rong Ou for this contribution.
    • ✅ #1201: Tests for correct handling of legacy and per-thread default streams. Thanks to Rong Ou for this contribution.

    🐛 Bug Fixes

    • #1260: Fix thrust::transform_inclusive_scan with heterogeneous types. Thanks to Rong Ou for this contribution.
    • 🔀 #1258, NVC++ FS #28463: Ensure the CUDA radix sort backend synchronizes before returning; otherwise, copies from temporary storage will race with destruction of said temporary storage.
    • #1264: Evaluate CUDA_CUB_RET_IF_FAIL macro argument only once. Thanks to Jason Lowe for this contribution.
    • #1262: Add missing <stdexcept> header.
    • #1250: Restore some THRUST_DECLTYPE_RETURNS macros in async test implementations.
    • ✅ #1249: Use std::iota in CUDATestDriver::target_devices. Thanks to Michael Francis for this contribution.
    • ✅ #1244: Check for macro collisions with system headers during header testing.
    • 🚚 #1224: Remove unnecessary SFINAE contexts from asynchronous algorithms.
    • #1190: Make out_of_memory_recovery test trigger faster.
    • #1187: Elminate superfluous iterators specific to the CUDA backend.
    • 🛠 #1181: Various fixes for GoUDA.
      Thanks to Andrei Tchouprakov for this contribution.
    • #1178, #1229: Use transparent functionals in placeholder expressions, fixing issues with thrust::device_reference and placeholder expressions and thrust::find with asymmetric equality operators.
    • #1153: Switch to placement new instead of assignment to construct items in uninitialized memory. Thanks to Hugh Winkler for this contribution.
    • #1050: Fix compilation of asynchronous algorithms when RDC is enabled.
    • #1042: Correct return type of thrust::detail::predicate_to_integral from bool to IntegralType. Thanks to Andreas Hehn for this contribution.
    • #1009: Avoid returning uninitialized allocators. Thanks to Zhihao Yuan for this contribution.
    • #990: Add missing <thrust/system/cuda/memory.h> include to <thrust/system/cuda/detail/malloc_and_free.h>. Thanks to Robert Maynard for this contribution.
    • ⚠ #966: Fix spurious MSVC conversion with loss of data warning in sort algorithms. Thanks to Zhihao Yuan for this contribution.
    • ➕ Add more metadata to mock specializations for testing iterator in testing/copy.cu.
    • ➕ Add missing include to shuffle unit test.
    • Specialize thrust::wrapped_function for void return types because MSVC is not a fan of the pattern return static_cast<void>(expr);.
    • 🗄 Replace deprecated tbb/tbb_thread.h with <thread>.
    • 🛠 Fix overcounting of initial value in TBB scans.
    • 👉 Use thrust::advance instead of += for generic iterators.
    • Wrap the OMP flags in -Xcompiler for NVCC
    • Extend ASSERT_STATIC_ASSERT skip for the OMP backend.
    • ➕ Add missing header caught by tbb.cuda configs.
    • 🛠 Fix "unsafe API" warnings in examples on MSVC: s/fopen/fstream/
    • 🛠 Various C++17 fixes.