[Haskell-cafe] Re: announcing darcs 2.0.0pre2
simonmarhaskell at gmail.com
Mon Dec 17 07:29:20 EST 2007
David Roundy wrote:
> I am pleased to announce the availability of the second prerelease of darcs
> two, darcs 2.0.0pre2.
Continuing my performance tests, I tried unpulling and re-pulling a bunch
of patches in a GHC tree. I'm unpulling about 400 patches using
--from-tag, and then pulling them again from a local repo. Summary: darcs2
is about 10x slower than darcs1 on unpull, and on pull it is 100x slower in
user time but only 20x slower in elapsed time.
In both cases, the repository was on an NFS filesystem. In the darcs2
case, the repository I was pulling from was on the local disk, and I'm also
using a cache (NFS-mounted). The darcs2 repository has been optimized, but
the darcs1 repository has not (at lesat, not recently). I did all of these
a couple of times to eliminate the effects of cache preloading etc., the
times reported are from the second run.
------- darcs 1:
$ time darcs unpull --from-tag 2007-09-25 -a
35.17s real 5.77s user 1.00s system 19% darcs unpull --from-tag
$ time darcs pull ~/ghc-HEAD -a
Pulling from "/home/simonmar/ghc-HEAD"...
33.51s real 3.62s user 1.05s system 13% darcs pull ~/ghc-HEAD -a
------- darcs 2:
$ time darcs2 unpull --from-tag 2007-09-25 -a
385.22s real 52.18s user 12.62s system 16% darcs2 unpull --from-tag
$ time darcs2 pull /64playpen/simonmar/ghc-darcs2 -a
Finished pulling and applying.
668.75s real 290.74s user 15.03s system 45% darcs2 pull
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