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CA-Red2Band: Communication-Avoiding Reduction To Band #1177

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@albestro albestro commented Aug 16, 2024

First basic implementation without all required bells and whistles.

  • It is not fully optimised
    • it does more communications than needed
    • it performs superfluous computation, e.g. it applies HH even when they are identities by construction
  • It does not manage edge-cases (e.g. incomplete tiles)
  • It does not work sub-band
  • It does not have a GPU backend

Changelog:

  • Some old reduction to band functions have been moved to a common place
  • Some old reduction to band functions (and related, e.g. t-factor) have been fixed to deal with distributed matrices where we want to work just on the local part

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cscs-ci run

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@albestro
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cscs-ci run

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