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Posted to issues@arrow.apache.org by "Wes McKinney (Jira)" <ji...@apache.org> on 2019/09/01 23:15:00 UTC

[jira] [Created] (ARROW-6411) [C++][Parquet] DictEncoderImpl::PutIndicesTyped has bad performance on some systems

Wes McKinney created ARROW-6411:
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             Summary: [C++][Parquet] DictEncoderImpl<T>::PutIndicesTyped has bad performance on some systems
                 Key: ARROW-6411
                 URL: https://issues.apache.org/jira/browse/ARROW-6411
             Project: Apache Arrow
          Issue Type: Bug
          Components: C++
            Reporter: Wes McKinney
             Fix For: 0.15.0


I was doing some benchmarking and noticed that this function showed up as slow due to {{__memmove_avx_unaligned_erms}}. I'm interested to investigate why this is, but for me it's fixed by changing the {{std::vector::reserve}} call to {{std::vector::resize}} and instead assigning elements into {{buffered_indices_}}. I'll add a Python benchmark that illustrates the problem to see if it shows up on other systems



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