On Wed, Sep 14, 2016 at 06:22:17PM -0700, Stefan Beller wrote:

> > Disappointingly, the answer seems to be "no".
> 
> After having looked at the data, I disagree with the conclusion.
> And for that I think we need to reason about the frequency
> of the operations happening.

I definitely agree that reads outnumber writes, and it's OK to have an
asymmetric tradeoff between the two. zstd5 isn't _too_ bad in that
respect. I guess I was just disappointed that the pack size was still
bigger, as I was really hoping to see some speed tradeoff without
getting a worse pack.

The other thing to weigh against is "if we were designing it today"
versus "is it worth the compatibility headaches now". A 6% improvement
in "rev-list --objects" is not that amazing for a data format change.
Bitmaps were an _easier_ data format change and are more like a 99%
speedup.

They do not apply to every operations, but we may be able to do similar
space/time tradeoffs that are easier to handle in terms of backwards
compatibility, and which yield bigger results.

-Peff

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