[all-commits] [llvm/llvm-project] 5470ea: [libc] Change the starting port index to use the S...

Joseph Huber via All-commits all-commits at lists.llvm.org
Tue Jan 30 11:07:11 PST 2024


  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 5470ea4e36d47ed09595517854f0fa07ca91e16f
      https://github.com/llvm/llvm-project/commit/5470ea4e36d47ed09595517854f0fa07ca91e16f
  Author: Joseph Huber <huberjn at outlook.com>
  Date:   2024-01-30 (Tue, 30 Jan 2024)

  Changed paths:
    M libc/src/__support/GPU/amdgpu/utils.h
    M libc/src/__support/GPU/generic/utils.h
    M libc/src/__support/GPU/nvptx/utils.h
    M libc/src/__support/RPC/rpc.h
    M libc/utils/gpu/server/rpc_server.h

  Log Message:
  -----------
  [libc] Change the starting port index to use the SMID (#79200)

Summary:
The RPC interface uses several ports to provide parallel access. Right
now we begin the search at the beginning, which heavily contests the
early ports. Using the SMID allows us to stagger the starting index
based off of the cluster identifier that is executing the current warp.
Multiple warps can share an SM, but it will guaruntee that the
contention for the low indices is lower.

This also increases the maximum port size to around 4096, this is
because 512 isn't enough to cover the full hardare parallelism needed to
guarantee this doesdn't deadlock.




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