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

["Wes McKinney (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/ARROW-6411?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Wes McKinney resolved ARROW-6411.
---------------------------------
    Resolution: Fixed

Issue resolved by pull request 5248
[https://github.com/apache/arrow/pull/5248]

> [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
>            Assignee: Wes McKinney
>            Priority: Major
>              Labels: pull-request-available
>             Fix For: 0.15.0
>
>          Time Spent: 1h 10m
>  Remaining Estimate: 0h
>
> 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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