Dulwich on Launchpad
Russel Winder
russel.winder at concertant.com
Wed Mar 3 09:43:01 GMT 2010
Martin,
On Wed, 2010-03-03 at 19:33 +1100, Martin Pool wrote:
[ . . . ]
> No, I actually meant
> <https://bugs.launchpad.net/ubuntu/+source/tdb/+filebug> which is the
> tdb package in Ubuntu, as opposed to upstream.
Aha, I didn't think of that :-)
Issue duly posted:
https://bugs.launchpad.net/ubuntu/+source/tdb/+bug/531210
> A bug in the tdb upstream tracker, if there is one, would also be fine.
>
> > Sorry to be stupid on this one.
>
> np, Launchpad's distinction between "tdb upstream" and "tdb in Ubuntu"
> while very cool is not very discoverable.
>
> My main point is that there is little point in saying "I wish
> Canonical would fix it" unless you can point to a clear description of
> just what "it" is. Thanks for being willing to start describing it.
Definitely. I get this with Gant and GPars -- generalized wish
statements are useless, things have to be made sufficiently concrete
that some metrication is possible.
Hopefully my issue has made a start at making my wish statements more
concrete. I think what I need now is instruction on what
experimentation would be useful to those who have the ability to fix
something, either in TDB or in Linux.
> istm that from what's been said, tdb should perhaps disable mmap mode
> in your situation or something; I think there is code for that. But
> let's have that conversation on a bug, not here, as it seems that
> bzr-svn is only a victim of a bug somewhere else.
I haven't looked at the code, and I guess the issue isn't a point of
pain for Jelmer. Speculating: using mmap may initially have been
introduced as an optimization, but I think it is now core to the way TDB
works. For local discs, and I guess over Samba -- and indeed NFS where
only Solaris is involved -- everything is fine. The issue seems only to
affect NFS mounted filestore on Linux. Personally I am surprised this
issue hasn't affected more people and become a point of pain for Linux.
I guess people just do the workaround of not using mmap except for
obviously local files so NFS is never a factor.
Anyway, this isn't really a Bazaar issue any more, so I guess this
thread should come to its natural end.
Thanks for prompting me to do the right thing Launchpad-wise.
--
Russel.
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Dr Russel Winder Partner
xmpp: russel at russel.org.uk
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London SW11 1EN, UK m: +44 7770 465 077 skype: russel_winder
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