Re: [Boost-build] Lastest BB v2 CVS seems slower to start up than 1.33.1

From: Reece Dunn (msclrhd_at_[hidden])
Date: 2006-08-18 06:35:22

Eoin wrote:

> Hello, I recently started using the latest CVS version of Boost to test 
> my most recent project and ensure it's compatible, in the process of 
> doing so I've gotten the impression that the latest CVS version of 
> Boost.Build v2 is slower to get going over the one in 1.33.1; 
> specifically there is a longer pause between when you execute bjam and 
> when it prints "warning: Python location is not configured" and the 
> other initial messages.

This is a known issue.

> Just thought I'd share this to see if anyone else has noticed the same 
> behavior or perhaps instead I've done something wrong with my setup.

It is not your setup. When invoking the top-level Jamfile.v2 script in the
Boost directory, BBv2 is globbing for header files to setup a header target,
allowing you to install the headers through BBv2. This is one of the things
that is causing the slowing. There was a thread on this a short while back.

There have also been people who are using a different hashing algorithm
to the one that bjam currently uses which is reported to improve the
speed.

Other things can be used to speed up BBv2, but ultimately, the bjam
language isn't designed for what BBv2 is doing - BBv2 is pushing the
bjam language to its limits. This is one of the motivations for moving
Boost.Build to Python.

- Reece
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