Joseph Myers <jos...@codesourcery.com>:
> On Mon, 23 Jul 2018, Richard Earnshaw (lists) wrote:
>
> > So traditional git bisect is inherently serial, but we can be more
> > creative here, surely. A single run halves the search space each time.
> > But three machines working together can split it into 4 each run, 7
> > machines into 8, etc. You don't even need a precise 2^N - 1 to get a
> > speedup.
>
> Exactly. Given an appropriate recipe for testing whether the conversion
> of history up to a given revision is OK or not, I can run tests in
> parallel for nine different revisions on nine different machines (each
> with 128 GB memory) at the same time as easily as running one such test.
I'll try to work up a script that bundles the test procedure this week.
Before I do that, though, I have an idea that might reduce the test times
a lot. It hasn't been practical to strip and topo-reduce the repository
before this, but I'm almpst finished porting repocutter to go.
> I think parallelising the bisection process is a better approach than
> trying to convert only a subset of branches (which I don't think would
> help with the present problem - though we can always consider killing
> selected branches with too many mid-branch deletealls, if appropriate) or
> waiting for a move to Go.
The conversion already kills one old branch because of an unrecoverable
malformation - I checked with the devlist about this. I agree that trying
to cut other branches is unlikely to be helpful while we have
incorrect conversion on trunk.
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<a href="http://www.catb.org/~esr/";>Eric S. Raymond</a>
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