[ashish01]

I was curious about how slow (or fast) it is compared to cpython. On fibonacci.py rustpython about 11x slower than cpython.

    def fib(n):
        if n == 0 or n == 1:
            return 1
        return fib(n-1) + fib(n-2)

    print(fib(35))

    time python3 ~/code/fibs.py
    14930352

    ________________________________________________________
    Executed in    1.18 secs    fish           external
       usr time    1.14 secs  180.00 micros    1.14 secs
       sys time    0.01 secs  616.00 micros    0.01 secs

    time ./target/release/rustpython ~/code/fibs.py
    14930352

    ________________________________________________________
    Executed in   13.44 secs    fish           external
       usr time   13.32 secs  175.00 micros   13.32 secs
       sys time    0.02 secs  776.00 micros    0.02 secs

[soerxpso]

Using the .__jit__() method in your rustpython version might get you a speedup (I assume they intend for this to be automatic eventually, and it's only explicit right now while the feature is under construction).

[ashish01]

I tried jit as well but looks like recursive functions cannot be jitted yet :(