On Fri, Feb 17, 2012 at 02:25:25PM -0800, Junio C Hamano wrote: > Jeff King <peff@xxxxxxxx> writes: > > > That being said, we do have an index extension to store the tree sha1 of > > whole directories (i.e., we populate it when we write a whole tree or > > subtree into the index from the object db, and it becomes invalidated > > when a file becomes modified). This optimization is used by things like > > "git commit" to avoid having to recreate the same sub-trees over and > > over when creating tree objects from the index. But we could also use it > > here to avoid having to even read the sub-tree objects from the object > > db. > > Like b65982b (Optimize "diff-index --cached" using cache-tree, 2009-05-20) > perhaps? That's what I get for speaking before running "git log". So yeah, we may be about as reasonably fast as we can go. Or maybe that optimization isn't kicking in for some reason. I think going further would require Piotr to do more profiling. -Peff -- To unsubscribe from this list: send the line "unsubscribe git" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html