Duncan Coutts:
On Mon, 2008-08-11 at 13:57 +0100, Simon Marlow wrote:
- Performance. darcs2 regressed in performance for many
operations we
commonly use. I've submitted some measurements for some things,
but
it's pretty easy to find your own test cases: things like "darcs
add",
"darcs whatsnew", "darcs unrecord" are all slower than darcs 1.
When
simple operations take multiple seconds to complete, it really
slows
down your workflow.
Turns out that the reason for slow darcs whatsnew is ghc bug #2093
http://hackage.haskell.org/trac/ghc/ticket/2093
because getSymbolicLinkStatus is broken on 32bit systems in 6.8.2 it
means that the 'stat' optimisation does not work so darcs has to read
the actual contents of many files. Obviously that's very slow,
especially over nfs. That explains why it worked for me in 0.2 seconds
but for you took several seconds user time and (even more real time
due
to nfs).
LOL - that is funny. GHC devel slowed down by slow darcs due to GHC
bug.
The bug is fixed, isn't it? So, recompiling darcs with 6.8.3 should
improve matters.
Manuel
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