Dulwich on Launchpad

[Russel Winder]

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.
=============================================================================
Dr Russel Winder      Partner
                                            xmpp: russel at russel.org.uk
Concertant LLP        t: +44 20 7585 2200, +44 20 7193 9203
41 Buckmaster Road,   f: +44 8700 516 084   voip: sip:russel.winder at ekiga.net
London SW11 1EN, UK   m: +44 7770 465 077   skype: russel_winder
-------------- next part --------------
A non-text attachment was scrubbed...
Name: not available
Type: application/pgp-signature
Size: 197 bytes
Desc: This is a digitally signed message part
Url : https://lists.ubuntu.com/archives/bazaar/attachments/20100303/5f7056e6/attachment.pgp