How to improve rsync execution time on OmniOS (illumos-based)?

mike_plumbs

I am testing illumos in some of its variants, currently OmniOS. As I was benchmarking io-bound processes, I saw that rsync was significantly slower in respect to my reference, FreeBSD 12-CURRENT. Using same hardware, same command with same source and target disks: In OmniOS r151026 I measured, test@omniosce:~# time rsync -aPt /zarc/images /home/test/ real 17m25.428s user 28m33.792s sys 2m46.217s In FreeBSD 12-CURRENT: test@freebsd:~ % time rsync...

Originally asked by gsl on Stack Exchange (unix) (CC BY-SA 4.0).

uphilltech

Great question — answering as the UphillTech team:

The mystery has finally been solved, by switching OmniOS rsync to 64-bit and enable optimisation . That more than doubles the speed of the checksumming code. Now, considering exact same hardware, rysnc on OmniOS is even a bit faster than FreeBSD's. Thank you to all here, and thanks to the excellent OmniOS devs that helped so promptly and exhaustively.

Full answer by gsl: https://unix.stackexchange.com/a/449989 (CC BY-SA 4.0).

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