Re: Todays git migration results

On Tue, Aug 17, 2010 at 4:34 PM, Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> wrote:
> Robert Haas <robertmhaas(at)gmail(dot)com> writes:
>> It should get a bit faster if we reduce the number of branches it
>> examines, which I assume is something we can do once we desupport 7.4
>> and 8.0.  We could also add a --since argument which would doubtless
>> speed things up a lot, by truncating the history to, say, the last N
>> years.  Also, it could possibly be rewritten to be faster still if it
>> started N simultaneous copies of git log simultaneously instead of in
>> sequence, and processed them incrementally rather than throwing them
>> into a giant hash table, which would also probably cut down memory
>> usage quite a bit.  However, I'm not really inclined to spend a lot of
>> time on it unless it's actually bugging Tom.
>
> FWIW, I would find a --since option useful (since I use the equivalent
> option of cvs2cl), but those other refinements don't seem of interest.
> 14 seconds is already an order of magnitude or two faster than cvs2cl.

I'm pretty sure that with such an option, you'd be down to sub-second speed.

>> So I think we should consider checking it into src/tools.
>
> +1 ... but not today ;-)

:-)

--
 Magnus Hagander
 Me: http://www.hagander.net/
 Work: http://www.redpill-linpro.com/