[Buildbot] #3272: Buildbot start-up time starts to tip-over once there logs for ~3000 builds in a builder (especially if a build has lots of steps)

[Buildbot trac]

#3272: Buildbot start-up time starts to tip-over once there logs for ~3000 builds
in a builder (especially if a build has lots of steps)
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Reporter:  vlovich  |      Owner:
    Type:  defect   |     Status:  new
Priority:  major    |  Milestone:  undecided
 Version:  0.8.10   |   Keywords:  performance
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 The algorithm for determineNextBuildNumber is O(MN) where M is the number
 of builds & N is the number of steps per build.   Even with only 3439
 builds there's 108556 files in a directory for a builder (~32 files per
 build).

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Ticket URL: <http://trac.buildbot.net/ticket/3272>
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Buildbot: build/test automation