Hello everybody,

We are developing a Rhodes application with a lot of images processing and we had to do some calculations in Javascript because our graphics lib is a Javascript one.
As these calculations took too much time for us, we tried to implement a basic benchmark test in Ruby in order to compare calculation performance.

The benchmark consists in building 2 matrices (1000x1000) with random data and build a third one with a simple M3(x,y) = M1(x,y)*M2(x,y)/255.

Here are the results we got with Rhodes 5.0.30 :
Rhosimulator : Ruby : 194 ms, Javascript : 58 ms
Android : Ruby : 871 ms, Javascript : 259 ms
Windows 8.1 : Ruby : 1801 ms, Javascript : 426 ms
iPhone6 : Ruby : 1700 ms (!!!), Javascript : 134 ms

We really thought Ruby should be faster as, if we understand well, Ruby code is compiled into Ruby-bytecode and then executed by the Rhodes rubyVM interpreter.

So my question is : is Javascript really always faster than Ruby in a Rhodes application and does it mean we should always prefer Javascript when it comes to massive calculation ?

Thanks,
Thierry