Have you tried fs_usage or iosnoop on both DU versions? It will require some
extra tampering with csrutil to get to work on Sierra but might bring an
answer..
Ciao,
Thomas
> Am 03.04.2017 um 21:40 schrieb Thomas Tempelmann <tempelm...@gmail.com>:
>
> An update:
>
> I've done hours of testing. First, with DU 15.0 from El Cap. With that, I
> found that copy perfomance on "Restore" from one to another disk or
> partition, as well as "New Disk Image from a partition" is optimal.
>
> But with DU 16.0, which is part of Sierra, performance goes does
> significantly (by that I mean several times slower, not just a few
> percentages).
>
> I wonder why that'd be. Since the copy times correlate to the differences one
> gets when using /dev/rdisk vs. /dev/disk, I guess this was some concious
> change. But why? AFAIK, it's been working well for decades using rdisk.
>
> Any ideas, anyone? I will soon blog about it, but I'd appreciate some input
> before I may be making a fool of myself, again ;)
>
> I might still be doing something wrong, but so far, I've done the testing on
> two different pairs of Macs, all connected via Thunderbolt, and I get
> consistent results, at least with DU 16.0.
>
> Back to more testing...
>
> Thomas
>
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