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  • Committer: Aaron Bentley
  • Date: 2007-06-22 22:19:13 UTC
  • mto: (2520.5.2 bzr.mpbundle)
  • mto: This revision was merged to the branch mainline in revision 2631.
  • Revision ID: abentley@panoramicfeedback.com-20070622221913-mcjioqruw8rhgnd8
Improve locking in _BaseMergeDirective.from_object

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doc/costs.txt
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Costs
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=====
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User thought is most expensive.  User time spent waiting is next.
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Developer time for the version control system is also relatively
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expensive.  
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Machine resources are cheap.  In particular; disk is generally very
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cheap; an ordinary programmer earns enough to buy hundreds of GB of
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disk per day.  However, it is sometimes limited, as on a laptop.
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Therefore it is generally OK to trade off disk space for anything
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else, but it should be possible to be compact.
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Network round trips are very bad.
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Consider scalability also; avoid anything worse than O(n).  Try to
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avoid anything that needs e.g. to hold the whole tree in memory at any
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time, or to hold the entire history of the project.
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