Performance & import

From: Vladimir Prus (ghost_at_[hidden])
Date: 2003-06-04 09:25:17

Soon after Dave's changes to import semantics, I've noticed slowdown in V2. 
Sometimes, before complain about syntax error in some module, bjam waits some 
seconds. Luckily, we've got profiling, so here's profile of 
'examples-v2/hello':

2310000 140000 773 modules.import
2310000 0 1 boost-build
2300000 110000 937 modules.load
1630000 1530000 1544 modules.normalize-raw-paths
1360000 10000 107 class.new
1340000 10000 107 class.instance
1060000 20000 203 class.__init__
890000 0 6 object(main-target)@1.generate-really
890000 0 6 object(main-target)@1.generate
890000 0 1 object(project-target)@1.generate
870000 0 6 object(typed-target)@1.generate
630000 0 2 object(typed-target)@1.construct
600000 10000 12 generators.construct

The 'modules.mormalize-raw-paths' takes more time than actually building 
targets! I think that now that "import" is required in every class, and is 
called during construction of all instances, we *really* need to optimize it 
-- and in particular, it should not call 'normalize-raw-paths' in such a way.
Thoughs?

- Volodya