[kepler-dev] draft conversion of ptII tree from svn to cvs and svn nits

[ian.brown at hsbcib.com]

Christopher,
        the benefits I see from SVN are different than what you highlight. 
In particular they are:

1. Atomic commits. The directory itself is versioned and so when you 
commit number of files to implement an issue they naturally stay together. 
Also, if a network problem happens you don't get into a situation where 
only some of the files are committed.

2. Better binary file handling. Binary diffs are stored and transmitted 
making updates faster and repository storage smaller.

3. Updates / commits are faster because diffs are sent both directions on 
the network whilst CVS tends to only send diffs from server -> client and 
sends entire files in the other direction.

I've not seen the disk hog stuff before. I assume this is the repository 
size on the server and not the client. You expect the client size to be 
twice that of CVS because SVN makes a backup of each file so that it can 
do local diff and rollback without needing to contact the server over the 
network. On the server, are you using the file storage configuration?

Ian




"Christopher Brooks" <cxh at eecs.berkeley.edu> 
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04/06/2008 04:14
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Subject
[kepler-dev] draft conversion of ptII tree from svn to cvs and svn nits
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Investment Banking Europe - IBEU






I have some notes about svn at
http://chess.eecs.berkeley.edu/ptolemy/wiki/Ptolemy/Subversion

The gist of this is reported below:

I did a first cut of a conversion from cvs to svn for the ptII tree.

To try it from the command line:
  svn co svn+ssh://source.eecs.berkeley.edu/home/svn_chess/ptII/trunk
  mv trunk ptII
  cd ptII
  ./configure

Note that this is just a test copy, this is not a live copy, I'll be 
deleting the svn tree and creating it again from cvs when I'm ready to
move over.  So, _don't_check_in_changes_ to the ptII svn repository
and expect to see them last.

I'll be working on the Eclipse setup and on a real set of instructions.

I found a few interesting nits about svn:

    * Is svn that much better than cvs? http://subversion.tigris.org
      says "Subversion is meant to be a better CVS, so it has most of
      CVS's features". Typical arguments used for svn over cvs:
          o Merging in svn is better than in cvs. How many people
            actually use branches?
          o It is easier to move files in svn than in cvs. This has
            some merit, but is it worth the effort?
    * Building the client requires way too many other packages. How
      can svn possibly stay secure if it depends on so many packages
    * Subversion can optionally use Apache for access. Enabling a web
      server on a machine that does not already have one makes the
      machine less secure.
    * There is no decent svn Unix style man page. This is deliberate,
      see Bug 1508. This is not good. I want to know exactly what
      commands will work with a specific installation of SVN, not what
      the latest documentation for the latest version is.
    * svn is a disk hog.
          o A gzipped tar file of the Ptolemy II cvs tree is 372.9 MB.
          o A gzipped tar file of the same tree after running the
            conversion from cvs to svn is 570MB. 


_Christopher
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