On Fri, Apr 6, 2012 at 3:41 PM, David Barr <davidbarr@xxxxxxxxxx> wrote: > On Thu, Apr 5, 2012 at 4:44 AM, Junio C Hamano <gitster@xxxxxxxxx> wrote: >> Nguyen Thai Ngoc Duy <pclouds@xxxxxxxxx> writes: >> >>> On Wed, Apr 4, 2012 at 5:53 AM, Junio C Hamano <gitster@xxxxxxxxx> wrote: >>> ... >>> I wonder what causes user time drop from .29s to .13s here. I think >>> the main patch should increase computation, even only slightly, not >>> less. >> >> The main patch reduced the amount of the data needs to be sent to the >> machinery to checksum and write to disk by about 45%, saving both I/O >> and computation. > > I hacked together a quick patch to try predictive coding the other > fields of the index. I got a further 34% improvement in size over > this series. Patches to come. I just used the previous cache entry as > the predictor and reused varint.h together with zigzag encoding[1]. > > That's a total improvement in size over v2 of 62%. Have you posted (and I missed) the patches? I'm interested in seeing what changes you made. > [1] https://developers.google.com/protocol-buffers/docs/encoding#types -- Duy -- 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