Comment 2 for bug 256757

ok:

bzr branch ~/src/schooltool/schooltool ~/src/st_upgrade

apparently works, but uses up ~700 mb of ram.

bzr info -v on the newly created branch gives:

Standalone tree (format: dirstate-tags)
Location:
  branch root: .

Related branches:
  parent branch: /home/ignas/src/schooltool/schooltool

Format:
       control: Meta directory format 1
  working tree: Working tree format 4
        branch: Branch format 6
    repository: Knit repository format 1

In the working tree:
      1276 unchanged
         0 modified
         0 added
         0 removed
         0 renamed
         0 unknown
         0 ignored
       285 versioned subdirectories

Branch history:
      2433 revisions
        20 committers
      1809 days old
   first revision: Fri 2003-09-05 10:36:15 +0000
  latest revision: Thu 2008-07-24 20:08:31 +0300

Repository:
      6409 revisions

My guess is that upgrading a shared repository of twice the size uses at least twice as much memory...