Gary Buhrmaster <gary.buhrmas...@gmail.com> writes:
> 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).
We have only one machine with a rotary HDD and 4 threads:
# for T in 1 0 4; do chcon -R -t root_t /etc/bad-label/; sync; for i in $(seq 1
3); do echo $i > /proc/sys/vm/drop_caches; done; echo -T $T; time fixfiles -F
-T $T restore; done
-T 1
real 3m32,046s
user 2m0,068s
sys 0m24,005s
-T 0
real 2m32,859s
user 2m9,265s
sys 0m26,775s
-T 4
real 2m38,355s
user 2m9,695s
sys 0m27,042s
Petr
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