On 27-set-09, at 14:37, Samuel Thibault wrote:
Brice Goglin, le Sun 27 Sep 2009 14:18:54 +0200, a écrit :
Samuel Thibault wrote:
but shouldn't it return the restricted topology (or have a method
that
returns the restricted topology).
It should already be the default. To get the whole system, see
lstopo
--help: --whole-system
Maybe he's referring to when the process launcher does a
sched_setaffinity/numatcl to restrict this process, as opposed to
administrator-wide restriction with linux cpusets or so. We could add
another topology flag for such restrictions.
Ah, right.
thanks for the quick answers, so I think that the answer is for now
you can on linux 2.6 if you use cpusets.
Having my app starting a a restricted subtask that will see it in its
topology in a portable way is not possible at the moment, if I
understood correctly.
Still it is already something.
I've wondered how to implement topology changes indeed. AIX does
have a
SIGRECONFIG signal for this, I don't know any support from other
OSes.
Maybe there's a inotify way to get such changes in Linux.
There is usually no inotify support for virtual files. I've just
tested
that it doesn't work for /sys/bus/usb/devices for instance. We'll have
to ask kernel developers for it.
ok just as information osx has such a callback if possible it would be
nice to have such functionality abstracted away...
thanks
Fawzi
