[MayeulC]

I am quite confused; doesn't rsync already use content-defined chunk boundaries, with a condition on the rolling hash to define boundaries?

https://en.wikipedia.org/wiki/Rolling_hash#Content-based_sli...

https://en.wikipedia.org/wiki/Rolling_hash#Content-based_sli...

The speed improvements over rsync seem related to a more efficient rolling hash algorithm, and possibly by using native windows executables instead of cygwin (windows file systems are notoriously slow, maybe that plays a role here).

Or am I missing something?

In any case, the performance boost is interesting. Glad the source was opened, and I hope it finds its way into rsync.

[re]

> doesn't rsync already use content-defined chunk boundaries, with a condition on the rolling hash to define boundaries?

No, it operates on fixed size blocks over the destination file. However, by using a rolling hash, it can detect those blocks at any offset within the source file to avoid re-transferring them.

https://rsync.samba.org/tech_report/node2.html

[ohitsdom]

The readme very nicely contrasts the approach with rsync.

[sneak]

rsync seems frozen in time; it’s been around for ages and there are so many basic and small quality of life improvements that could have been made that haven’t been. I have always assumed it’s like vim now: only really maintained in theory, not in practice.

[chasil]

Please bear in mind that there are [now] two distinct rsync codebases.

The original is the GPL variant [today displaying "Upgrade required"]:

https://rsync.samba.org/

The second is the BSD clone:

https://www.openrsync.org/

The BSD version would be used on platforms that are intolerant of later versions of the GPL (Apple, Android, etc.).

[Zardoz84]

So you not used vim or neovim in the last 10 years ?

[lftl]

To be fair, there was a roughly 6 year period when vim saw one very minor release. That slow development period was the impetus for the fork of Neovim.

[Zardoz84]

I know. I use Neovim. But since that, and thanks to Neovim, Vim has speedup and got some improvements.

[dotancohen]

Time for neorsync.

That said, VIM 8 was terrific.