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  • Committer: Martin Pool
  • Date: 2006-01-13 09:57:13 UTC
  • mto: This revision was merged to the branch mainline in revision 1611.
  • Revision ID: mbp@sourcefrog.net-20060113095713-1fa5912229a3898e
Review updates of pycurl transport

Split them out into 

  bzrlib.transport.http             common base
  bzrlib.transport.http._urllib     pure python
  bzrlib.transport.http._pycurl     calls pycurl

Update to work with robert's nice transport test multiplexer.

Add PyCurlTransport.has() which does just a HEAD request; should be faster.

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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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