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From "Luc Maisonobe (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (MATH-579) FastMath.pow much slower than Math.pow
Date Tue, 17 May 2011 18:33:47 GMT

    [ https://issues.apache.org/jira/browse/MATH-579?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13034948#comment-13034948
] 

Luc Maisonobe commented on MATH-579:
------------------------------------

This is strange. Could you run the FastMathTestPerformance junit test (in the utils package).
On my personal computer (which is also a 64 bits machine running Ubuntu), FastMath.pow is
about 28% faster than either StrictMath.pow or Math.pow on Java 5 and 26% faster on Java 6.

> FastMath.pow much slower than Math.pow
> --------------------------------------
>
>                 Key: MATH-579
>                 URL: https://issues.apache.org/jira/browse/MATH-579
>             Project: Commons Math
>          Issue Type: Bug
>    Affects Versions: 3.0
>         Environment: java version "1.6.0_22"
> OpenJDK Runtime Environment (IcedTea6 1.10.1) (6b22-1.10.1-0ubuntu1)
> OpenJDK 64-Bit Server VM (build 20.0-b11, mixed mode)
> java version "1.6.0_24"
> Java(TM) SE Runtime Environment (build 1.6.0_24-b07)
> Java HotSpot(TM) 64-Bit Server VM (build 19.1-b02, mixed mode)
>            Reporter: Arne Plöse
>
> calculating FastMath.pow(10, 0.1 / 20) is approximately 65 times slower as the Math.pow()
function.
> Ether this is a bug or a javadoc comment is missing.

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