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  • Committer: Robert Collins
  • Date: 2005-08-23 06:52:09 UTC
  • mto: (974.1.50) (1185.1.10) (1092.3.1)
  • mto: This revision was merged to the branch mainline in revision 1139.
  • Revision ID: robertc@robertcollins.net-20050823065209-81cd5962c401751b
move io redirection into each test case from the global runner

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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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