Re: [Boost-build] BBv2 intolerably slow in Boost tree.

From: Vladimir Prus (ghost_at_[hidden])
Date: 2006-07-26 13:24:37

On Wednesday 26 July 2006 21:18, David Abrahams wrote:
> Vladimir Prus <ghost_at_[hidden]> writes:
> > On Wednesday 26 July 2006 19:42, David Abrahams wrote:
> >> Vladimir Prus <ghost_at_[hidden]> writes:
> >> > On Wednesday 26 July 2006 18:15, David Abrahams wrote:
> >> >> Simple things like rebuilding the "html" target in libs/parameter/doc
> >> >> or rebuilding the "sfinae" target in libs/parameter/test produce an
> >> >> intolerably long delay for me before any build actions start.
> >> >
> >> > For a start, is delay the same on the second invocation as it is on
> >> > the first?
> >>
> >> To my perception, yes.
> >
> > In my case, on cold run it takes ~30 seconds, and then ~2. Probably
> > because there's 6G of memory here, so all disk accesses are cached.
>
> I have 2G; shouldn't that be enough?

I don't know.

> >> > Also, can you try the attached patch to top-level Jamfile.v2?
> >>
> >> With the patch, it flies!
> >
> > What's performance of V1? I can replace the globbing code with that we
> > have there, as a quick solution.
>
> v1 is much faster than v2, even with the patch.  

Then there's something wrong in globbing code. 

> Building starts 
> essentially instantaneously.

>
> > I also planed to make globbing lazy -- and don't it it unless we're
> > installing -- but maybe that's not important if V1 code works fine.
>
> I think you have slowdowns elsewhere.

Well, one thing at a time.

- Volodya