Re: git fetch slow as molasses due to tag downloading

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Hi,

On Thu, 14 Dec 2006, Han-Wen Nienhuys wrote:

> just upgraded our autobuilder from 1.4.3 to 1.4.4.2.
> 
> Now, our standard download command comes to a complete halt.  Judging
> >from the "ps -ef" apparently, it does 
> 
>    git-show-ref --verify --quiet -- [TAG]
> 
> This is done for every one of the 1500 tags that are in my repository. 
> At approx 20 tags per second this takes an awful lot of time. 
> 
> 1. Is this necessary? 

Yes. The purpose is to check which tags have not yet been fetched.

> 2. Is this efficient?  Wouldn't doing all tags in a single git-show-ref 
> invocation be potentially quicker?

It is not efficient. But it cannot be solved like you propose, since it is 
inside a loop, and a "continue" is executed when the tag exists already.

IMHO this should be solved as a filter: "git-show-ref --stdin 
--show-invalid". Thus, git does not have to traverse _every_ ref for 
_every_ incoming tag.

Ciao,
Dscho

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