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From "Prasanth Jayachandran (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HIVE-12086) ORC: Buffered float readers to remove vtable thunks
Date Mon, 12 Oct 2015 15:50:05 GMT

    [ https://issues.apache.org/jira/browse/HIVE-12086?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14953235#comment-14953235
] 

Prasanth Jayachandran commented on HIVE-12086:
----------------------------------------------

java version "1.8.0_60"

Benchmark                              Mode  Cnt         Score        Error  Units
FloatReaderOrc.testReadFloat          thrpt   50  14094447.673 ± 118479.602  ops/s
FloatReaderOrc.testReadFloatBuffered  thrpt   50  14032977.620 ± 100002.271  ops/s


> 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
>
>
> 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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