python VM v.s. V8

どういうわけだか、v8は圧倒的に速いです。
おそらく、関数呼び出しをいじっているのでしょう。

[nori@Asama]~/Desktop/work/packaging/v8/fromGoogle% time python test.py

102334155

python test.py  142.48s user 0.02s system 99% cpu 2:22.58 total

[nori@Asama]~/Desktop/work/packaging/v8/fromGoogle% time ./v8 test.js

102334155



./v8 test.js  6.87s user 0.00s system 99% cpu 6.879 total

test.py

def fib(n):

  if n < 0:

    return 0

  elif n == 1:

    return 1

  return fib(n-1) + fib(n-2)



print fib(40)

test.js(test.pyより自動生成)

function len(s) {

return s.length;

}



function dict() {

    var arr = new Array();

    for (var i=0;i        arr[dict.arguments[i]] = dict.arguments[i+1]

    }

    arr.toString = function() {

      var result = "";

      for (var key in arr)

      {

        if (result.length) result += ", "

        result += String(key) + ": " + String(arr[key])

      }

      return "{" + result + "}";

    }

    return arr;

}

function fib(n) {

if (n < 0) {

return 0;

} else if (n == 1) {

return 1;

} else {

}

return fib(n - 1) + fib(n - 2);

}

print( String(fib(40)), ' ', "\n");