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Posted to issues@commons.apache.org by "Gilles (Commented) (JIRA)" <ji...@apache.org> on 2012/02/09 17:05:59 UTC
[jira] [Commented] (MATH-740) Some "FastMath" functions are slow
[ https://issues.apache.org/jira/browse/MATH-740?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13204607#comment-13204607 ]
Gilles commented on MATH-740:
-----------------------------
I should note that the above numbers seem to vary wildly from run to run (my machine is fairly loaded at the moment) but the trend is there: Always too slow.
Looking at the code, it seems that there are potential source of inefficiencies (like the missing "final" keywords which I've added, in a recent commit for "atan") or accessing array locations (instead of storing the value in a local variable), but each of those changes is likely to not demonstrate a significant improvement. :(
> Some "FastMath" functions are slow
> ----------------------------------
>
> Key: MATH-740
> URL: https://issues.apache.org/jira/browse/MATH-740
> Project: Commons Math
> Issue Type: Wish
> Reporter: Gilles
> Priority: Minor
> Fix For: 3.1
>
>
> From the two benchmarks we currently have in "FastMathTestPerfomance", we have that the following functions are much slower in "FastMath" than in either "Math" or "StrictMath" (the performance *loss*, for each of the benchmarks, is given in parentheses):
> * log10 (46%, 36%)
> * log1p (68%, 112%)
> * tan (11%, 61%)
> * atan (26%, 125%)
> * atan2 (44%, 40%)
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