[mythtv-users] "Nice" recommendations

[Nick Morrott]

On 31 October 2017 at 13:35, John Pilkington <J.Pilk at tesco.net> wrote:
> On 31/10/17 11:27, Mark Perkins wrote:
>>
>> On 31 October 2017 8:53:39 pm Stuart Auchterlonie
>> <stuarta at squashedfrog.net> wrote:
>>
>>> On 31/10/17 06:15, Ian Evans wrote:
>>>>
>>>> I notice that when I run a mythvidexport.py user job moving a recording
>>>> to the video section, the responsiveness of the interface grinds to a
>>>> halt and the load goes north of 5.
>>>>
>>>> Haven't really used nice much. Any recommendations what nice level I
>>>> should run it at?
>>>>
>>>
>>> nice -19
>>>
>>> which is basically background task, and everything else takes priority.
>>>
>>>
>>> Regards
>>> Stuart
>>>
>>   I am kind of working from memory here but maybe add an ionice -c3 as
>> well?
>>
> Yes, I use that too.  Many media-type jobs do not-much number crunching but
> a lot of data shifting.  ionice -c3 sets I/O priority to 'idle' and 'man
> ionice' says "The impact of an idle I/O process on normal system activity
> should be zero"  That's not what I see, but I think it helps.

Responsiveness on SATA SSD-based systems (not NVMe interfaces, which
has its own scheduler in recent kernels) system might also be
increased (or increased further) by switching to the deadline I/O
scheduler for these disks.

Cheers,
Nick