Gary Buhrmaster <gary.buhrmaster@xxxxxxxxx> writes:
> On Mon, Jul 18, 2022 at 6:44 AM Petr Lautrbach <plautrba@xxxxxxxxxx> wrote:
>>
>> Dan Čermák <dan.cermak@xxxxxxxxxxxxxxxxxx> 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
_______________________________________________
devel mailing list -- devel@xxxxxxxxxxxxxxxxxxxxxxx
To unsubscribe send an email to devel-leave@xxxxxxxxxxxxxxxxxxxxxxx
Fedora Code of Conduct: https://docs.fedoraproject.org/en-US/project/code-of-conduct/
List Guidelines: https://fedoraproject.org/wiki/Mailing_list_guidelines
List Archives: https://lists.fedoraproject.org/archives/list/devel@xxxxxxxxxxxxxxxxxxxxxxx
Do not reply to spam on the list, report it: https://pagure.io/fedora-infrastructure
