On February 17, 2010 13:00:39 Oswald Buddenhagen wrote: > On Wed, Feb 17, 2010 at 05:36:43PM +0000, John Tapsell wrote: > > I'm not all that convinced we even need shallow clones. > > > > The Gnome guys found shallow clones only saved a small amount of space: > > > > The first size, in MB, is the full checkout, and second number is a > > shallow clone of depth 1. > > > > [...] > > > > Hardly seems worth the complication, let alone being a blocker wish, > > for a 10% saving. > > these numbers were to be expected, as a shallow clone needs to contain > the head revisions of all files in the tip tree. the rest is stored in > pretty efficient xdeltas. and as most files mostly only gain code, the > inverse deltas are small. so a project must have a rather impressive > history to make its length contribute significantly to the repo size. > however, things are radically different for badly compressible binary > data, especially when files are often completely discarded - artwork. > > narrow clones will be a significantly bigger gain, as *all* blobs for > the irrelevant files are omitted, including the big tip ones, obviously. > > and just in case it's not obvious: one consequence of the delta > compression is that any file's bare presence at any point in time has a > significantly bigger impact than another file's long history. which is > one of the reasons why i want a clean splitting which enables moving > without leaving behind artificts. shallow/narrow clones would > theoretically compensate most of the problem, but i predict that in the > end everyone who is actually using the history will end up with more or > less complete clones sooner or later anyway.
just in case anyone's not clear on the terminology: a shallow clone is one that doesn't have the full history. a narrow clone is one that doesn't have all the files (eg. just kdebase/workspace/plasma instead of the whole kdebase) -- This message brought to you by eevil bananas and the number 3. www.chani3.com
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