> Il giorno 13 dic 2018, alle ore 17:41, stan <stanl-fedorauser@xxxxxxxxxxx> ha scritto: > > On Thu, 13 Dec 2018 13:42:24 +0100 > Paolo Valente <paolo.valente@xxxxxxxxxx> wrote: > >> To test the behavior of your system, why don't you check, e.g., how >> long it takes to start an application while there is some background >> I/O? >> >> A super quick way to do this is >> >> git clone https://github.com/Algodev-github/S >> cd S/comm_startup_lat >> sudo ./comm_startup_lat.sh <scheduler-you-want-to-test> 5 5 seq 3 >> "replay-startup-io gnometerm" >> >> The last command line >> - starts the reading of 5 files plus the writing of 5 other files >> - replays, for three times, the I/O that gnome terminal does while; >> starting up (if you want I can tell you how to change the last >> command line so as to execute the original application, but you would >> get the same results); >> - for each attempt, measures how long this start-up I/O takes to >> complete. > > Results for cfq and noop, haven't enabled bfq yet. I interpret these > as showing that cfq was a large improvement for all categories except > write throughput, where it actually degraded performance. > Great! You don't have bfq for a comparison, but you can still get an idea of how good your system is, by comparing these start-up times with how long the same application takes to start when there is no I/O. Just do sudo ./comm_startup_lat.sh <scheduler-you-want-to-test> 0 0 seq 3 "replay-startup-io gnometerm" and get ready to be surprised (next surprise when/if you'll try with bfq ...) Thanks, Paolo > cfq > > Latency statistics: > min max avg std_dev conf99% > 22.142 27.157 24.1967 2.6273 52.5604 > Aggregated throughput: > min max avg std_dev conf99% > 67.29 139.74 105.491 19.245 39.7628 > Read throughput: > min max avg std_dev conf99% > 51.73 135.67 102.402 21.3985 44.2123 > Write throughput: > min max avg std_dev conf99% > 0.01 46.29 3.08857 8.37179 17.2972 > > noop > > Latency statistics: > min max avg std_dev conf99% > 40.861 42.021 41.3637 0.595266 11.9086 > Aggregated throughput: > min max avg std_dev conf99% > 45.66 72.89 55.9847 5.99054 9.87365 > Read throughput: > min max avg std_dev conf99% > 41.69 70.85 51.9495 6.02467 9.9299 > Write throughput: > min max avg std_dev conf99% > 0 7.9 4.03527 1.62392 2.67656 > _______________________________________________ > devel mailing list -- devel@xxxxxxxxxxxxxxxxxxxxxxx > To unsubscribe send an email to devel-leave@xxxxxxxxxxxxxxxxxxxxxxx > Fedora Code of Conduct: https://getfedora.org/code-of-conduct.html > List Guidelines: https://fedoraproject.org/wiki/Mailing_list_guidelines > List Archives: https://lists.fedoraproject.org/archives/list/devel@xxxxxxxxxxxxxxxxxxxxxxx _______________________________________________ kernel mailing list -- kernel@xxxxxxxxxxxxxxxxxxxxxxx To unsubscribe send an email to kernel-leave@xxxxxxxxxxxxxxxxxxxxxxx Fedora Code of Conduct: https://getfedora.org/code-of-conduct.html List Guidelines: https://fedoraproject.org/wiki/Mailing_list_guidelines List Archives: https://lists.fedoraproject.org/archives/list/kernel@xxxxxxxxxxxxxxxxxxxxxxx
