Re: Version control tools

[Joseph Rushton Wakeling]

On 08/01/14 21:13, David Kastrup wrote:
> Actually, that seems like a mischaracterization to me.  It's the single
> file logs which aren't cheaper than the multi-file logs.

You could be right.  In any case, the Facebook devs are claiming wins for all 
change-related commands, including status, diff, update and commit:
https://code.facebook.com/posts/218678814984400/scaling-mercurial-at-facebook/

> At the current point of time, due to a discussion about version control
> on the Emacs developer list, I am working on git blame which is
> ridiculously slow.  For the file src/xdisp.c, it takes about 2 minutes
> on my computer.  I've cut it down by some 20 or 30% on the first
> attempt, but with my current approach, I should eventually get it down
> to few seconds at most.  At the current point of time, it segfaults
> almost instantaneously.  One out of two ain't bad...
>
> Ridiculous that this code has not been sensibly improved over the last
> 10 years or so...

It's a surprise to me, certainly.  What do you think of the Facebook developers' 
contention that Git's internals would be difficult to work with if serious 
scaling gains are desired?