[Boost-build] Glob and startup times.

From: Rene Rivera (grafikrobot_at_[hidden])
Date: 2006-09-18 02:02:19

An update on the startup time for building from the 
boost-root/Jamfile.v2. I just checked in changes to use the faster BBv1 
algorithm for globing through the headers. Before and after perf:

  --count--  --gross--    --net--     --each--    --mem--   --each--
          0      81126          0     0.000000  329241390  329241390
          0      52970          0     0.000000  318892205  318892205

So a savings of 28 seconds and of 9.9M of allocations (the new algo 
takes about 2 seconds to do the glob). Not that a 53 second startup is 
anything to be proud of :-( This leaves the following top 5 time sinks:

  --count--  --gross--    --net--     --each--    --mem--   --each--
      42586       9352       7082         0.17   57224878       1343 
regex.split
      10760      14511       5035         0.47   24564384       2282 
toolset.find-property-subset
       3176       5841       5029         1.58   38371492      12081 
class_at_property-map.find-replace
       2316       5983       4123         1.78    9523567       4112 
class_at_property-set.__init__
        752      17544       1768         2.35   22136926      29437 
toolset.set-target-variables-aux

Enjoy.

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