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From "Gopal V (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HIVE-12086) ORC: Buffered float readers to remove vtable thunks
Date Tue, 13 Oct 2015 01:22:07 GMT

     [ https://issues.apache.org/jira/browse/HIVE-12086?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Gopal V updated HIVE-12086:
---------------------------
    Attachment: perf-top-floatreader.png

!perf-top-floatreader.jpg!

[~prasanth_j]: The benchmark doesn't look very different - I will probably work more on this,
beyond changing the buffered reader.

> ORC: Buffered float readers to remove vtable thunks
> ---------------------------------------------------
>
>                 Key: HIVE-12086
>                 URL: https://issues.apache.org/jira/browse/HIVE-12086
>             Project: Hive
>          Issue Type: Bug
>          Components: File Formats
>    Affects Versions: 1.3.0, 2.0.0
>            Reporter: Gopal V
>            Assignee: Gopal V
>            Priority: Minor
>         Attachments: HIVE-12086.1.patch, perf-top-floatreader.png
>
>
> ORC float tree reader spends an inordinate amount of time, doing vtable thunks through
InputStream interface.
> The actual operation is not faster with this patch, but the interface lookup goes down
~4x.



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