Re: [PATCH] always start looking up objects in the last used pack first

On Wed, 30 May 2007, Nicolas Pitre wrote:

To test this I split the Linux repository into 66 packs and performed a
"time git-rev-list --objects --all > /dev/null".  Best results are as 
follows:

	Pack Sort			w/o this patch	w/ this patch
	-------------------------------------------------------------
	recent objects last		26.4s		20.9s
	recent objects first		24.9s		18.4s

This shows that the pack order based on object age has some influence, 
but that the last-used-pack heuristic is even more significant in 
reducing object lookup.

For reference, the same operation on a fully packed into a single pack 
repository takes 17.1s.  So this looks damn good to me.


Nicolas