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Posted to dev@mahout.apache.org by "viiccwen (via GitHub)" <gi...@apache.org> on 2026/01/20 14:48:17 UTC

[I] [Feature] Optimize MmapReader of Numpy fast path [mahout]

viiccwen opened a new issue, #885:
URL: https://github.com/apache/mahout/issues/885

   ### Summary
   
   It's an follow-up issue for #877 and also sub-issue of #718
   
   https://github.com/apache/mahout/blob/38ced949d2242277ea735f6e7f97706d045b6251/qdp/qdp-core/src/readers/numpy.rs#L649-L653
   
   Since we use `copy_f64s_from_bytes` in MmapReader that requires high-throughput, we implement with `bytes -> f64 transformation + copy` now, we want to improve it into a pure memcpy method (zero-copy).


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Re: [I] [QDP] Optimize MmapReader of Numpy fast path [mahout]

Posted by "400Ping (via GitHub)" <gi...@apache.org>.

400Ping commented on issue #885:
URL: https://github.com/apache/mahout/issues/885#issuecomment-3777385582

   The original PR doesn't have significant improvements, @guan404ming close this.


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Re: [I] [QDP] Optimize MmapReader of Numpy fast path [mahout]

Posted by "guan404ming (via GitHub)" <gi...@apache.org>.

guan404ming closed issue #885: [QDP] Optimize MmapReader of Numpy fast path
URL: https://github.com/apache/mahout/issues/885


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