On Mon, Jul 18, 2022 at 11:50 AM Gary Buhrmaster
<gary.buhrmas...@gmail.com> wrote:
>
> On Mon, Jul 18, 2022 at 6:44 AM Petr Lautrbach <plaut...@redhat.com> wrote:
> >
> > Dan Čermák <dan.cer...@cgc-instruments.de> writes:
> > >
> > > Just out of curiosity, how large is the speedup typically?
> > >
>
> >
> > It depends on the number of threads your machine has. But you could get some
> > data for comparison using `fixfiles -T 1 restore` and `fixfiles -T 0
> > restore` on a running system. The following times are reported on my
> > workstation:
> >
>
> Has anyone run such a test on a system using
> classic ("spinning rust") HDDs? It is sometimes
> the case that parallelizing activities that are I/O
> intensive can result in excessive seek activity
> that can result in rather elongated elapsed times
> (much worse than single threaded operation).
If that turns out to be the case, it should be possible to detect the
use of an SSD vs. a spinning-disc HDD and trigger the `-T` argument
appropriately. I don't know if the Change Proposers have plans for
that.
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