choosing an scheduling algorithm for a RTOS

Hi,
     Can you please let me know, based on what factors we choose a
scheduling algorithm for a RTOS?

Regards

ramu wrote:
> Hi,
>      Can you please let me know, based on what factors we choose a
> scheduling algorithm for a RTOS?
> 
> Regards

Well that is an extremely open question - on which many PHDs have been 
written.  I would suggest you turn it around, say what you are wanting 
to achieve and then let people suggest algorithms for your particular case.

However, I suspect this is just a student question - in which case I 
would suggest visiting Amazon.

-- 

Regards,
Richard.

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On Sun, 08 Nov 2009 10:58:09 +0000, FreeRTOS info <noemail@given.com>
wrote:

>ramu wrote:
>>      Can you please let me know, based on what factors we choose a
>> scheduling algorithm for a RTOS?
>
>Well that is an extremely open question - on which many PHDs have been 
>written.  I would suggest you turn it around, say what you are wanting 
>to achieve and then let people suggest algorithms for your particular case.

I'm pretty sure this is a student question.

>However, I suspect this is just a student question - in which case I 
>would suggest visiting Amazon.

I've taught these classes before -- Operating Systems and Concurrent
Programming, for example.  And at my university, these are typically
2nd year classes for CS students.  This framing of the question is
almost right off of a homework sheet, which might be:  "List four
different scheduling algorithms with short descriptions about them,"
and in the next question, "For each of those, what factors would
choose one scheduling algorithm over another?"

Jon


P.S. 
The only caveat to the OP's choice of words is the "RTOS" part of the
question.  Usually, classes like this don't focus on 'real-time'
except in the broadest of senses, as the students have their hands
full learning the methods themselves and some key issues about them
and writing a simulator to try them out with some test cases.  So
about the level you get to in class is if the tasks get some
reasonable percent of cpu time, a very low share of it, or no share at
all -- under some scheduling method.  I don't recall bandying "RTOS"
around in class, except in broader strokes.