Re: Using ionice -c3 in f13: system seems less responsive than under f12

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On 26/11/10 14:21, John Pilkington wrote:
> On 26/11/10 08:46, Harald Hoyer wrote:
>> Am 25.11.2010 14:30, schrieb John Pilkington:
>>> Hi: My system spends a lot of its time processing video data, often
>>> with not much numerical processing involved - just remuxing or making an
>>> iso image. atop often shows disk activity above 90%. I do most of this
>>> using ionice -c3, (ie 'idle' scheduling) which is supposed to reduce
>>> impact on other tasks. The man page says "The impact of idle io
>>> processes on normal system activity should be zero" and certainly
>>> under f12 that seemed at least approximately true; but under f13
>>> terminal response is often very sluggish when these tasks are running.
>>> Using kde 4.5.3, scheduling elevator=deadline (as in f12).
>>>
>>> Am I expecting the right thing? Does anyone else see this?
>>>
>>> John P
>>>
>>
>> maybe your processing is using CPU also?
>>
> Well, yes.  But the CPU-intensive parts seem ok; it's the parts that are
> essentially datastream shuffling that are having the most impact, and it
> seems more noticeable than it did in f12.  I've tried to arrange these
> to read and write on different spindles.  Maybe different tasks are
> having to be retrieved from disk, and that accounts for the delay, but I
> didn't think that was happening.  Swap doesn't appear to be active.
>
> My initial reply didn't go to the list.  Sorry!
>
>
My impression is that the system has become more responsive now - 
perhaps after today's update to util-linux-ng-2.17.2-9.fc13.x86_64.rpm
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