Re: [Xenomai-core] CONFIG_SMP in switchtest

[Gilles Chanteperdrix <gilles.chanteperdrix@xenomai.org>]

Jan Kiszka wrote:
> Philippe Gerum wrote:
> 
>>On Tue, 2007-06-12 at 08:42 +0200, M. Koehrer wrote:
>>
>>>Hi everybody,
>>>
>>>I want to know why the --enable-smp option for "configure" of Xenomai is used when there
>>>is already the corresponding option selected with the kernel configuration?
>>
>>--enable-smp is only used when you want the user-space side to _require_
>>SMP support to be present into the running kernel; i.e. for some (weird)
>>reason, your application really needs this. Xenomai libraries don't care
>>whether SMP support is enabled or not, they are not sensitive to that
>>issue (see the "weak" status of this option in README.INSTALL)
> 
> 
> Switchtest bases some compile-time decisions on CONFIG_SMP. Nitpicking,
> OK, but I wonder if this is required. Gilles?

If you do not enable the smp option, switchtest will only use one cpu.
The reason why I made this is that, on some UP machine, (probably arm,
but I do no longer remember) sysconf(_SC_NPROCESSORS_ONLN) did not work.

-- 
                                                 Gilles Chanteperdrix