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From "Phil Steitz (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (MATH-579) FastMath.pow much slower than Math.pow
Date Wed, 18 May 2011 15:06:47 GMT

    [ https://issues.apache.org/jira/browse/MATH-579?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13035426#comment-13035426
] 

Phil Steitz commented on MATH-579:
----------------------------------

I think Luc did a great job providing the right information to users.  In answer to your question,
Gilles, there are some applications where 100ms is a big deal and if they just make one or
two calls, the associated latency will be surprising and could cause problems for them.  If
we get a lot of feedback from users indicating that this latency is a material practical problem
for them, or prevents them using the library, we may want to consider making the embedded
use configurable.  I can think of only a few cases in my experience where this might be an
issue; but I am thankful to Arne for having pointed it out and Luc for improving the documentation.

> 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
>             Fix For: 3.0
>
>
> 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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