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

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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.

Thanks for this.  I suspect I wasn't really stressing my system when I
was evaluating it, and it was subjective.  I'm running a kernel with cfq
right now, but I will boot the noop kernel when I get a chance and test
it.  I suppose I could just switch to noop io scheduling instead.
Should be interesting.
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