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Editorial Team
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Asked: 2026-05-17T20:53:34+00:00

Hi all I’m having an problem with my JNI library. The execution time of

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Hi all
I’m having an problem with my JNI library.
The execution time of the same code changes from one phone to the other.
I thought it was just because we were testing on an old phone but recently I run on htc legend and all the jni code was slow…

I run the profiler and its really a night and day difference:
on some phone the jni functions take 15% to 20% as on the other phones it takes 40% and 50% for the same conditions…

anybody has an explanantion?

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  1. Editorial Team

    If one of the phones use JIT (Just In Time) Compiler added in Foryo (2.2) than that one should be much faster then your older ones. Are you testing it using the same android version?

    Apart from that Some devices are better in float-point math than others. Devices which does not implement an FPU will emulutae float point operations. Here you can find a nice blog post about it: http://www.badlogicgames.com/wordpress/?p=71.

    There are planty of sources on how to implement a float point system using fixed point arithmetics: http://en.wikipedia.org/wiki/Fixed-point_arithmetic

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