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

From: David Abrahams (dave_at_[hidden])
Date: 2006-07-26 15:20:32

Vladimir Prus <ghost_at_[hidden]> writes:

> 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. 

What makes you think all the time is going into globbing?

-- 
Dave Abrahams
Boost Consulting
www.boost-consulting.com