Re: Significant performance waste in git-svn and friends

From: Shawn O. Pearce <spearce@spearce.org>
Date: Sep 7, 2007, 04:55 UTC
Message-ID: <20070907045557.GY18160@spearce.org>
In-Reply-To: <20070906070407.GA19624@soma>

Eric Wong <normalperson@yhbt.net> wrote:

Show 7 quoted lines

> Making git-svn use fast-import would be very nice.  I've got a bunch
> of other git-svn things that I need to work on, but having git-svn
> converted to use fast-import would be nice.  Or allowing Git.pm
> to access more of the git internals...
> 
> However, how well/poorly would fast-import work for incremental
> fetches throughout the day?

It would work just fine. git-p4 uses fast-import and runs it in incremental mode all of the time.

What will happen is you will get a packfile per git-svn fetch, so if you fetch 5 times that day you will get 5 packfiles that day. But you could also get 5 packfiles from git-fetch if each of those fetches brought in 100 or more new objects. So it really is not that big of a deal.

At some point the number of packfiles gets out of control, but so does the number of loose objects. Repacking is the obvious fix in both cases.

-- 
Shawn.