Commits on Aug 17, 2022

1. Fix performance bugs in scalar reductions (nv-legate#509) …

   * Unify the template for device reduction tree and do some cleanup
   
   * Fix performance bugs in scalar reduction kernels:
   
   * Use unsigned 64-bit integers instead of signed integers wherever
     possible; CUDA hasn't added an atomic intrinsic for the latter yet.
   
   * Move reduction buffers from zero-copy memory to framebuffer. This
     makes the slow atomic update code path in reduction operators
     run much more efficiently.
   
   * Use thew new scalar reduction buffer in binary reductions as well
   
   * Use only the RHS type in the reduction buffer as we never call apply
   
   * Minor clean up per review
   
   * Rename the buffer class and method to make the intent explicit
   
   * Flip the polarity of reduce's template parameter

   

   magnatelee authored and marcinz committed Aug 17, 2022
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