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From "Jeff Zhang (JIRA)" <j...@apache.org>
Subject [jira] Commented: (PIG-688) PERFORMANCE: Vectorize operators
Date Mon, 30 Nov 2009 16:49:20 GMT

    [ https://issues.apache.org/jira/browse/PIG-688?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12783736#action_12783736
] 

Jeff Zhang commented on PIG-688:
--------------------------------

Actually, MapRunner push record to Map class.

> PERFORMANCE: Vectorize operators
> --------------------------------
>
>                 Key: PIG-688
>                 URL: https://issues.apache.org/jira/browse/PIG-688
>             Project: Pig
>          Issue Type: Improvement
>            Reporter: Thejas M Nair
>
> By Vectorization, I mean passing multiple (/vector of) records at a time between operators
(and potentially other functions like udfs)
> Vectorization of pig operators can improve performance by 
> 1. improving locality and cache utilization
> 2. Reducing number of function calls. Many functions calls are likely to be dynamically
resolved. There may be some checks in each function that we might be able to do once for several
recs.
> 3. Potentially benefit from cpu pipeline architecture. ( But I don't know how good java
VM is at that ..)
> To do vectorization in map stage, we need to use MapRunner - see PIG-687.

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