In article <1142964756.044294.226380@g10g2000cwb.googlegroups.com>, "Noway2" <no_spam_me2@hotmail.com> wrote:
>
>Use of the DSP/BIOS will consume processor resources.  The figure I
>have read is that in general use of an RTOS, such as the DSP/BIOS will
>add about 5% to the processor load.
>

I think this number is a little high.  In the sloooooow old days, this would 
have been an upper limit on a practical system.  Processors have gotten faster 
which reduces the amount of time executing the OS code since most of what is 
needed from the operating system hasn't changed that much.

IMHO YMMV

Medris wrote:
> Hi,
> is there any different in cpu time using dsp/bios and without in real-time
> and the code is same.
>
> Medris

If your code makes no use of operating system services, and operates as
the only process in the system, the run time impact will be minimized.
At a programmable "tick rate", the OS will interrupt your code, do some
housekeeping, and return to your code. The difference in CPU time
depends on how time consuming the housekeeping is and on the tick rate.

But if you are using an OS, then you probably want it to actually do
something.

John

Medris wrote:
> Hi,
> is there any different in cpu time using dsp/bios and without in real-time
> and the code is same.

Use of the DSP/BIOS will consume processor resources.  The figure I
have read is that in general use of an RTOS, such as the DSP/BIOS will
add about 5% to the processor load.

However, use of a pre-emtive scheduler such as the DSP/BIOS can help to
ensure that your application meets its "real time" demands, even though
the scheduler requires resources itself.  This can be accomplished
because the scheduler WILLl execute the highest priority task that CAN
be executed and your real time tasks SHOULD be higher priority than
ones that are not time critical.  What this means is that your
application can be designed so that it isn't busy waiting or performing
non time critical tasks when a time critical operation is capable of
and needs to be performed.

Medris wrote:
> Hi, 
> is there any different in cpu time using dsp/bios and without in real-time
> and the code is same.

How can the code be the same with and without BIOS support?

Jerry
-- 
Engineering is the art of making what you want from things you can get.
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