Leistungstest

Some folks in #mercurial @ freenode.net just repeated the tests, so we have now a bit more stable data.

The evaluation shows the following:

1. Initial clone: hg is about 4.4 times faster (about 2 min vs. 6 to 15 min)
2. Repository sizes: the hg repo is about 1.92 smaller (~113M vs. 215M)
3. Time for a full log: hg is about 2.36 times faster (~21s vs. ~50s)
4. Time for annotating Misc/NEWS: hg is 1.5 times slower than bzr.
   Without the result from bzr-1.6.1 it is 2.6 times slower (~43s vs 17s).
5. Integrity checking: hg is by several orders of magnitude faster than bzr which just took too long - everyone stopped it after varying time (30s to 17 min), because the output spoke of hours remaining, one had an integrity error. hg needed about 1 min.
6. Local clone: hg is 11 times faster (39s vs. 7.14 min).
   Without the 1m15 result from the high disk load host it is 16 times faster (26s).
7. Local clone with hot filesystem: hg is 14.9 times faster (26s vs. 6.5 min).
8. Hot copy of just .bzr / .hg: The speeds are about equal, so the difference doesn't come from raw filesystem speed (2s).
9. Additional Bazaar tests to check shared repository cloning performance (you only get this when you use a shared repository and only clone that shared repository): With shared repository and hardlinks bzr only needs about 5 seconds for cloning.

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