About Multiprocessing

Karel Gardas kgardas at objectsecurity.com
Tue Dec 20 11:14:52 UTC 2005


this is interesting, why is this this way? Nobody contributed SMP support 
yet, or does real SMP support hurts real-time functionality? Or is this 
just "historic relict"?


On Tue, 20 Dec 2005, Jiri Gaisler wrote:

> We are currently developing an MP system with four LEON3 (SPARC)
> cpus in a shared memory configuration. We are using the MP extensions
> and memory-based communication, works fine so far. Pitty that RTEMS
> doesn't have support for SMP, i.e. one image with multiple threads
> executed by multiple cpus. eCos has this and it scales well up to
> ~ four processors. With RTEMS, we must have a separate image for each
> cpu, which wastes memory and complicates linking and program loading.
> Jiri.
> Ralf Corsepius wrote:
>> On Tue, 2005-12-20 at 20:11 +1100, Angelo Fraietta wrote:
>>> there are over 40 CPUs (or rather BSPs) that RTEMS SUPPORTS
>> ... but only 3 of these BSPs claim to support multiprocessing:
>> m68k/mvme147s, m68k/mvme136, powerpc/psim :)
>> i.e. multiprocessing for all cpus but the m68k and powerpc, probably has
>> never been tested at all ;)
>> Ralf
>> .

Karel Gardas                  kgardas at objectsecurity.com
ObjectSecurity Ltd.           http://www.objectsecurity.com

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