From mboxrd@z Thu Jan 1 00:00:00 1970 Message-ID: <466EDC2C.3020200@domain.hid> Date: Tue, 12 Jun 2007 19:47:24 +0200 From: Gilles Chanteperdrix MIME-Version: 1.0 References: <30228710.1181630552942.JavaMail.ngmail@domain.hid> <1181630207.7354.20.camel@domain.hid> <466ED96E.4050806@domain.hid> In-Reply-To: <466ED96E.4050806@domain.hid> Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Subject: Re: [Xenomai-core] CONFIG_SMP in switchtest List-Id: "Xenomai life and development \(bug reports, patches, discussions\)" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: Jan Kiszka Cc: xenomai-core 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