On 13/01/10 17:50, Eric Kow wrote:
Hi Simon,
On Sat, Jan 09, 2010 at 21:00:34 +0000, Simon Marlow wrote:
With a local filesystems it is usable, but I need to test it at work
with my NFS-mounted home directory.
Any comments? I'd like to see if Darcs in its present state is usable
over NFS.
I'm afraid I'm not at work right now and won't be back for at least
another week due to being on paternity leave.
I realise getting to the point where GHC could use hashed repos is an
important goal for darcs, and I'm still very grateful for that. A lot of
the work you guys are doing is either helping us now, or will do in the
future.
I expect that what we'll do once 2.4 is out is provide hashed mirrors of
the main GHC repo, and recommend that people start testing them. We may
even make that the default, since then we can vastly simplify our
"getting the sources" instructions. If some of us have to stick with
darcs-1 repos for the time being (e.g. if there turns out to be issues
with NFS), that's not a big deal.
We may need to postpone the patch72 cache-splitting till Darcs 2.5, so
if you could live without it, that'd be great.
My general perception is that many things are quicker, but operations I
would expect to be instant (and were very quick with darcs 1), like
pulling/unpulling 1 patch in a GHC repo, are taking several seconds with
hashed repos and darcs 2. I've tried optimize --reorder, to no avail.
This is resulting in an overall impression of sluggishness, which is
unfortunate.
That is most unfortunate. Looks like Petr has some thoughts on this
which could appear in a later version of Darcs.
That would be high up my priority list right now, I was encouraged to
see Petr's analysis even though it doesn't look like an easy fix. It
appears that all operations that modify the repo are currently
O(patches), whereas many of them I would expect to be O(1) or at worst
O(patches since last optimized tag).
Cheers,
Simon
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