Uploaded image for project: 'Commons Math'
  1. Commons Math
  2. MATH-650

FastMath has static code which slows the first access to FastMath

    Details

    • Type: Improvement
    • Status: Closed
    • Priority: Minor
    • Resolution: Fixed
    • Affects Version/s: None
    • Fix Version/s: 3.0
    • Labels:
      None
    • Environment:

      Android 2.3 (Dalvik VM with JIT)

      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

        Attachments

          Activity

            People

            • Assignee:
              Unassigned
              Reporter:
              ale6 Alexis Robert
            • Votes:
              0 Vote for this issue
              Watchers:
              1 Start watching this issue

              Dates

              • Created:
                Updated:
                Resolved: