[V2] toolset msvc efficiency

From: janssoaf (mail_at_[hidden])
Date: 2003-12-04 07:50:04

I'm trying to adapt our projects to BBv2 and I'm experiencing severe
performance problems with the msvc toolset. Building the dependency
graph of a project takes fifty times as long compared with the gcc
toolset. The project consists of a lot of DLLs which depend on each
other, so I suspect that import libraries are the culprit.

Comparing the top of the dependency graph of a simple example with two
DLLs I get :

gcc:
0 Name: all
: Stable
: NOTFILE 
: Depends on <.../gcc/...>Cmpstrm.dll (stable) (max time)

msvc:
0 Name: all
: Stable
: NOTFILE 
: Depends on <.../msvc/...>Cmpstrm.dll (stable) (max time)
: Depends on <.../msvc/...>TBZLib.dll (stable)
: Depends on <.../msvc/...>Cmpstrm.lib (stable)

The number of top level dependencies grows exponentially when more
DLLs are included. Profiling shows that with the msvc toolset many
more method calls are necessary than in the gcc toolset, e.g. 

gcc:
125 125 1680 set.intersection

msvc:
344900 344900 92412 set.intersection

Can this behaviour be improved?