Re: Draft release notes for v1.5.3, as of -rc1

From: Brian Downing <bdowning@lavos.net>
Date: Jul 13, 2007, 13:50 UTC
Message-ID: <20070713135034.GK19073@lavos.net>
In-Reply-To: <7vlkdkq00o.fsf_-_@assigned-by-dhcp.cox.net>

On Thu, Jul 12, 2007 at 11:40:39PM -0700, Junio C Hamano wrote:

> GIT v1.5.3 Release Notes (draft)
> ========================
> 
> * New commands and options.

  - "git repack" learned a "window-memory" limit which dynamically
    reduces the window size to stay within the specified memory usage.

"git-repack -a -d -f --window=100000 --window-memory=512m" seems to be good for those overnight make-it-smaller-damn-the-torpedoes archival repackings. (You can't just set --window to BIGNUM as it still allocates an array of that size.) Thanks to Nicolas Pitre's depth bias patch a high --depth doesn't seem to be quite as critical anymore to save space; it still helps, but things much much better at a lower depth.

As a point of reference, it took around two hours to repack a repository containing 108,440 objects, around 35,000 files (most with no history), and my aforementioned troublesome 20MB RTF file (which uses about 60MB per revision when sitting in the window due to the delta index cache) with the above command. This is on a 2GHz Core 2 Duo in 64-bit mode.

-bcd