Re: sync() slowdown

From: Matthieu Moy <matthieu.moy@imag.fr>
Date: May 26, 2008, 16:09 UTC
Message-ID: <vpq1w3p59ns.fsf@bauges.imag.fr>
In-Reply-To: <20080526142607.GA3082@kali.thurne.chezwam.org>

Sebastien Gross <seb-git@chezwam.org> writes:

> I think this might be useful if you repack many repositories.
> If you call the sync command before looping the repacks I guess this
> could be equivalent (modulo changes done in repositories during that
> time).

I suppose git-repack does something like

write_new_data(); sync(); delete_old_data();

And if you remove the "sync" and your system crashes (or you eject your USB key, or ...) while "delete_old_data" is done, but "write_new_data" hasn't been sync-ed to the hard disk, you're in trouble.

If you repack many repositories, I guess the first time is expansive, but the next ones pay only for what they just did.

My 2 cents,

-- 
Matthieu