[Boost-users] Boost Python is slow?

Subject: [Boost-users] Boost Python is slow?
From: Tyomich on the AIR (cadchrk_at_[hidden])
Date: 2009-07-09 05:00:47

Hello everyone! I'm currently embedding Python and have a problem. I have a struct (point) which looks like

struct TPoint
{
    int x, y;
};

And I want it to be usable from Python. I made it in two ways: the first one was writing all the warpping by myself according to Python/C API, and the second was wrap it with Boost.Python. So it looks like

class_<TPoint>("TPoint")
    .def_readwrite("x", &TPoint::x)
    .def_readwrite("y", &TPoint::y);

It wraps ok but here is a problem: I create a huge (1000000 items) list of objects of that type:

def cr_fig(n):
    res = []
    while n>0:
        res.append(TPoint())
        n -= 1
    return res

And then when I use a simple function which just increments the x member of every object, this function takes about 4 seconds to process the whole list (1000000 items) of Boost-wrapped objects and less than a second to process objects of my own wrapping! How this can be possible? Is Boost.Python much more slower than Python itself?

Regards, Artyom Chirkov.

P.S. I couldn't find out how to write to Boost.Python community, so I wrote here. If anyone knows how to do that, please let me know!