Re: [jamboost] Some refactorings and speedups

From: David Abrahams (dave_at_[hidden])
Date: 2003-02-11 08:05:56

Vladimir Prus <ghost_at_[hidden]> writes:

> David Abrahams wrote:
>> Vladimir Prus <ghost_at_[hidden]> writes:
>> 
>> 
>>>>:-). Now you can apply the header cache and move the hotspot back
>>>>into our code. ;-)
>>>
>>>Actually, *our* code which deals with scanning is hotspot. There must be
>>>some obvious inefficiencies.
>> 
>> 
>> If you mean the code which processes the #include... lines, using the
>> header cache, it would be called much less.
>
> Do you mean that the same file is scanned several times in common setting? Why?

Normally, yes, because stock Jam is stupid ;-).

I'm not sure if the header cache patch by itself eliminates this
re-scanning, but it looks like it does. However, turning on the
HCACHEFILE will speed up consecutive builds by preventing re-scanning
between builds.

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