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From "Gilles (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (MATH-745) up to 5x Performance Improvement on FasFourierTransformer.java by using a recursive iterative sumation Approach
Date Mon, 13 Feb 2012 11:16:59 GMT

    [ https://issues.apache.org/jira/browse/MATH-745?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13206808#comment-13206808
] 

Gilles commented on MATH-745:
-----------------------------

Would it be possible to use our little benchmark utility ("PerfTestUtils" in the "test" section
of the source repository)?  There are examples of usage in "o.a.c.m.util.FastMathTestPerformance").
You could run it once before the changes you propose and once after, and post the 2 tables
here. Thanks!

                
> up to 5x Performance Improvement on FasFourierTransformer.java by using a recursive iterative
sumation Approach
> ---------------------------------------------------------------------------------------------------------------
>
>                 Key: MATH-745
>                 URL: https://issues.apache.org/jira/browse/MATH-745
>             Project: Commons Math
>          Issue Type: Improvement
>    Affects Versions: 3.0
>            Reporter: Leandro Ariel Pezzente
>              Labels: FFT, Fast, Fourier, Transform
>         Attachments: FastFourierTransformer.patch.txt
>
>
> By swithinch form a loop iterative approach to a recursive iterative approach on fastFourierTransformer.java
a Perfomance Improvement of up to 5x is gained.

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