Performance of the compiled vs. interpreted javascript in java7 / Rhino

Question

I have a problem with performance of Rhino javascript engine in Java7, shortly - my script (that parses and compiles texts) runs in Chrome around 50-100 times quicker than t

Answer 1

It looks like i've found what is wrong - compilation used in 'my' code (actually taken from internet samples) has nothing to do with 'compiled'.

Finally i've got to this link - https://developer.mozilla.org/en-US/docs/Rhino_JavaScript_Compiler - the Rhino's tool to compile .js into .class. I've got following result with the same JS code running compiled from .class's bytecode:

 time: 202ms, chars: 38890, sum: 2046720
 time: 92ms, chars: 38890, sum: 2046720
 time: 73ms, chars: 38890, sum: 2046720
 ...
 time: 71ms, chars: 38890, sum: 2046720
 time: 66ms, chars: 38890, sum: 2046720
 time: 64ms, chars: 38890, sum: 2046720
  ... 1143ms (per 15 iterations)

--- sleep 5 secs ---

 time: 64ms, chars: 38890, sum: 2046720
 time: 52ms, chars: 38890, sum: 2046720
 time: 64ms, chars: 38890, sum: 2046720
 ...
 time: 62ms, chars: 38890, sum: 2046720
 time: 67ms, chars: 38890, sum: 2046720
 time: 67ms, chars: 38890, sum: 2046720
  ... 962ms


--- sleep 5 secs ---

 time: 66ms, chars: 38890, sum: 2046720
 time: 56ms, chars: 38890, sum: 2046720
 time: 59ms, chars: 38890, sum: 2046720
 ...
 time: 69ms, chars: 38890, sum: 2046720
 time: 67ms, chars: 38890, sum: 2046720
 time: 59ms, chars: 38890, sum: 2046720
  ... 966ms

(this is roughly 10 time quicker)

and this is the result from Chrome:

 time: 5ms, chars: 38890, sum: 2046720
 time: 3ms, chars: 38890, sum: 2046720
 time: 1ms, chars: 38890, sum: 2046720
 time: 1ms, chars: 38890, sum: 2046720
 time: 1ms, chars: 38890, sum: 2046720
 time: 5ms, chars: 38890, sum: 2046720
 time: 0ms, chars: 38890, sum: 2046720
 time: 1ms, chars: 38890, sum: 2046720
 time: 1ms, chars: 38890, sum: 2046720
 time: 1ms, chars: 38890, sum: 2046720

(average is 3-4 msec, ~15 quicker than compiled Java/Rhino, and ~200 times quicker than interpreted Java/Rhino).