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From "Olga Natkovich (JIRA)" <j...@apache.org>
Subject [jira] Commented: (PIG-688) PERFORMANCE: Vectorize operators
Date Mon, 30 Nov 2009 15:05:20 GMT

    [ https://issues.apache.org/jira/browse/PIG-688?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12783684#action_12783684

Olga Natkovich commented on PIG-688:

The existing MapRunner should be fine since it provides an iterator interface and we can place
data into a bag before passing it to the pipeline

> 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
> 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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