Re: [boost] "Small buffer optimization" for boost::function?

From: Vladimir Prus (ghost_at_[hidden])
Date: 2005-12-28 01:51:32

Alex Besogonov wrote:

> Good <time-of-day>!
> 
> Why not use 'small buffer optimization' for boost::function? Most of
> allocations are 8-16 bytes - an optimal size for SBO.
> 
> This optimization will make boost::function _much_ faster - in one of

How much faster, exactly? Recently, in a thread "[signal] performance" I've
posted a small benchmark that finds boost::function to take 4 times more
time that call via function pointer -- which, IMO, is pretty fast.

Can you use that benchmark to obtain speedup for your optimization?

> our project boost::function is responsible for 15% of the whole
> processor time.

I find it pretty strange, can you clarify how it's possible. How did you
measure the time spend in boost::function?

- Volodya