Re: [Boost-build] bjam acceleration

From: Rene Rivera (grafikrobot_at_[hidden])
Date: 2007-10-25 02:01:47

Motonari Ito wrote:
> The biggest problem I have in bjam is its speed.

:-)

> We have 1M lines of code managed by Boost Build system (V2). Bjam takes
> 20-30 second (when current directory is root) or 5-6 second (when
> current directory is leaf) before starting actual compilations. It's
> very slow for daily compile & edit development.

Not bad... Boost testers that run many toolsets see a few times that. 
And in my own project I see 2 minute startup times.

> So, I have profiled on the latest bjam (Milestone 12) with Rational
> Quantify.

You can get more detailed information just by running:

   bjam -d+10 -n -a ...

<http://boost.org/doc/html/jam/usage.html#jam.usage.options>

> It looks like memory and hash related functions are bottle

Yep.

> neck - is there any chance to accelerate them?

There's always a chance ;-) And interesting ideas are welcome. Just make 
sure to search the archives of this list to familiarize yourself with 
the many attempts at improving the performance.

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