On 28/08/2009 15:45, Jason Dagit wrote:
On Fri, Aug 28, 2009 at 7:11 AM, Simon Marlow<[email protected]> wrote:
On 26/08/2009 14:00, Eric Kow wrote:
Is Darcs slower on Windows and MacOS X than
on Linux?
I don't know if this is a new one, but 'darcs whatsnew' with hashed
repositories on Windows seems to have a performance problem:
I don't know if it's a new one either, but it's new to me and interesting.
$ darcs show repo
Type: darcs
Format: hashed
Root: d:/builds/ghc-testing
Pristine: HashedPristine
Cache: thisrepo:d:/builds/ghc-testing, cache:C:\Documents and
Settings\simonmar\Application Data\darcs\cache
boringfile Pref: .darcs-boring
Default Remote: x:/ghc-HEAD
Num Patches: 21106
$ time darcs w -s
No changes!
real 0m3.126s
user 0m0.000s
sys 0m0.015s
$ darcs --version
2.3.0 (release)
Compared to Linux, where the time is ~0.25s. These are all local
filesystems.
I see that the vast majority of that time is reported as "real". Does
that give us any leads to trouble shoot this? My vague understanding
of the time command is that when there is a lot of "real" time that
often means the program spent most of its time in system calls or
doing IO.
(I'd like to use hashed repos on Windows, mainly to avoid the
case-insensitive-filesystem issue with non-hashed repos).
I don't know how much hassle this would be for you, but anytime you
can send us detailed profiling reports or specific workflows that are
too slow that helps us. Knowing that whatsnew --summary is too slow
on the ghc repo is a good example. But also, if you sent us the
darcs.prof file that helps too.
If it's easy to build a profiled darcs, then I'll happily do it (cabal
install darcs --enable-profiling?).
And of course, Petr's work will eventually speed this up quite a bit.
I don't recall if whatsnew was improved yet in HEAD, but it's on the
roadmap as I understand it.
This is darcs 2.3.0, which has Petr's whatsnew improvements in it, which
is why the result is so surprising!
Cheers,
Simon
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