Re: [LAD] Any package builders here?

On Wed, Jun 1, 2011 at 7:49 AM, Nick Copeland <nickycopeland@email-addr-hidden> wrote:
> I might get flamed for this however GUI should not really be run with rt
> priority,

anyone who would do such a thing is a fool, indeed.

> that is an honour for the DSP engines. There are some reasonable arguments
> however for leaning on the scheduler with renice for the user interfaces to
> give
> them a bit of a bias over other system operations.

what are those arguments? keep in mind that the algorithms inherent in
SCHED_OTHER are targetting console-driven applications that do varying
balances of disk i/o, computation and user input/output. they really
don't address the situation of an app that needs to redraw with a
relatively fixed interval on screen, nor do they provide any actual
scheduling guarantees, which means that any disk i/o issues cannot be
solved with nice - you still have to plan for and deal with the worst
case scenario (which is why ardour's default disk i/o buffers are
*FIVE SECONDS* long (we really have seen delays of this length when
reading from disk!). nice becomes even less relevant in an era of
separate i/o scheduling algorithms that are not designed to pay much
(sometimes no) attention to nice values.
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Received on Wed Jun 1 16:15:01 2011