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BIGNUMA and NUM_THREADS>256 on 2×192-core AmpereOne (AArch64) #5555

@DanielWicz

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@DanielWicz

Hi,

I’d like clarification on using OpenBLAS on a 2×192-core AmpereOne (384 cores total), AArch64 Linux.

Planned build:

make TARGET=ARMV8 USE_OPENMP=1 NUM_THREADS=384 BIGNUMA=1

Docs mention a default 256-core limit, and BIGNUMA=1 extending support to 1024 cores, but this seems described mainly for x86_64.

Questions:

  1. On AmpereOne (AArch64), is BIGNUMA=1 NUM_THREADS=384 a supported/validated configuration for a single process?
  2. Or should AArch64 builds be treated as limited to 256 threads per process (keep NUM_THREADS <= 256 and use multiple MPI ranks)?
  3. Is BIGNUMA intended to be x86_64-only, or is it expected to work on Arm as well?

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