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Posted to github@arrow.apache.org by GitBox <gi...@apache.org> on 2020/12/28 19:44:13 UTC

[GitHub] [arrow] Dandandan commented on pull request #9032: ARROW-11048: [Rust] Added bench to MutableBuffer

Dandandan commented on pull request #9032:
URL: https://github.com/apache/arrow/pull/9032#issuecomment-751841922


   I am not sure what is causing the difference, I would expect it to be faster just as `from_slice prepared` is faster.
   The main difference is that initializing with capacity `0` uses `memory::allocate_aligned` while the other uses a few calls to `memory::reallocate`. I guess the first is (quite) a bit slower somehow?


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