[MATH-650] FastMath has static code which slows the first access to FastMath

• Type: Improvement
• Status: Closed
• Priority: Minor
• Resolution: Fixed
• Fix Version/s: 3.0

Environment

Android 2.3 (Dalvik VM with JIT)

• Assignee: Unassigned
• Reporter: Alexis Robert
• Created: 24/Aug/11 13:17
• Updated: 23/Jul/12 23:24
• Resolved: 15/Feb/12 21:07

Description

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