Re: Which I/O scheduler is Fedora switching to in 4.21? mq-deadline or BFQ?

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> 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
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