Version 21.06.0 (June 24, 2021)

• Build
  • Version information is now compiled into Realm and Legion. This takes
    the form of a string (e.g. "legion-21.06.0") rather than anything
    that can be compared (i.e. no semantic versioning here). Compile-time
    defines REALM_VERSION and LEGION_VERSION are available as well as
    run-time calls Realm::Runtime::get_library_version and
    Legion::Runtime::get_library_version.
• Regent
  • Support for dynamic checks on projection functors, enabling a
    much larger class of loops to be supported as index launches
  • Support for local tasks (i.e., without going through the
    runtime) via __demand(__local)
• Realm
  • Windows (MSVC) builds are now tested in CI and and therefore more likely
    to work
  • Realm runtime can now be shutdown and reinitialized in the same process.
    (Exception: GASNet-based network layers do not support this.)
  • Registration of host memory with CUDA driver is skipped for host
    memories larger than 1GB by default due to CUDA driver overhead.
    This threshold can be increased (or decreased) with -cuda:hostreg
• Tools
  • New Rust implementation of Legion Prof is 5-15x faster than the
    original (even with PyPy). For more details, see:
    https://legion.stanford.edu/profiling/#rust-legion-prof