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https://issues.apache.org/jira/browse/MATH-650?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13105295#comment-13105295
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Gilles edited comment on MATH-650 at 9/15/11 12:34 PM:
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Hi Luc.
Here is a "unit test" that reports timings for the set of function calls which
you referred to on the ML.
Before those calls, I've added a single call to "abs" (as a trivial function
that does not trigger the tables initialization) in order to estimate the time
taken by the "bare" initialization of "FastMath".
was (Author: erans):
Hi Luc.
Here is a "unit test" that reports timings
for the set of function calls which you referred to on the ML.
Before those calls, I've added a single call to "abs" (as a trivial function
that does not trigger the tables initialization) in order to estimate the time
taken by the "bare" initialization of "FastMath".
> FastMath has static code which slows the first access to FastMath
> -----------------------------------------------------------------
>
> Key: MATH-650
> URL: https://issues.apache.org/jira/browse/MATH-650
> Project: Commons Math
> Issue Type: Improvement
> Affects Versions: Nightly Builds
> Environment: Android 2.3 (Dalvik VM with JIT)
> Reporter: Alexis Robert
> Priority: Minor
> Attachments: FastMathLoadCheck.java, LucTestPerformance.java
>
>
> Working on an Android application using Orekit, I've discovered that a simple
> FastMath.floor() takes about 4 to 5 secs on a 1GHz Nexus One phone (only the
> first time it's called). I've launched the Android profiling tool (traceview)
> and the problem seems to be linked with the static portion of FastMath code
> named "// Initialize tables"
> The timing resulted in :
> - FastMath.slowexp (40.8%)
> - FastMath.expint (39.2%)
> \- FastMath.quadmult() (95.6% of expint)
> - FastMath.slowlog (18.2%)
> Hoping that would help
> Thanks!
> Alexis Robert
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