Re: Mercurial 0.4e vs git network pull

[Petr Baudis <pasky@ucw.cz>]

Dear diary, on Sun, May 15, 2005 at 01:52:50PM CEST, I got a letter
where "Adam J. Richter" <adam@yggdrasil.com> told me that...
> On Sun, 15 May 2005 14:40:42 +0200, Petr Baudis wrote:
> >Dear diary, on Sun, May 15, 2005 at 01:22:19PM CEST, I got a letter
> >where "Adam J. Richter" <adam@yggdrasil.com> told me that...
> [...]
> >> 	I don't understand what was wrong with Jeff Garzik's previous
> >> suggestion of using http/1.1 pipelining to coalesce the round trips.
> >> If you're worried about queuing too many http/1.1 requests, the client
> >> could adopt a policy of not having more than a certain number of
> >> requests outstanding or perhaps even making a new http connection
> >> after a certain number of requests to avoid starving other clients
> >> when the number of clients doing one of these transfers exceeds the
> >> number of threads that the http server uses.
> 
> >The problem is that to fetch a revision tree, you have to
> 
> >	send request for commit A
> >	receive commit A
> >	look at commit A for list of its parents
> >	send request for the parents
> >	receive the parents
> >	look inside for list of its parents
> >	...
> 
> >(and same for the trees).
> 
> 	Don't you usually have a list of many files for which you
> want to retrieve this information?  I'd imagine that would usually
> suffice to fill the pipeline.

That might be true for the trees, but not for the commit lists. Most
commits have a single parent, except merges, which are however extremely
rare with more than two parents too.

-- 
				Petr "Pasky" Baudis
Stuff: http://pasky.or.cz/
C++: an octopus made by nailing extra legs onto a dog. -- Steve Taylor
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