Re: cpuset - question

[Sylvain Jeaugey]

To come back to Randy's original question ...

Cpusets are not - in my view - designed to display the NUMA architecture.
/sys already does this very well (example of a 16 way machine) :
$ ls /sys/devices/system/node/node*
/sys/devices/system/node/node0:
cpu0  cpu1  cpu2  cpu3  cpumap  distance  meminfo  numastat
 
/sys/devices/system/node/node1:
cpu4  cpu5  cpu6  cpu7  cpumap  distance  meminfo  numastat
 
/sys/devices/system/node/node2:
cpu10  cpu11  cpu8  cpu9  cpumap  distance  meminfo  numastat
 
/sys/devices/system/node/node3:
cpu12  cpu13  cpu14  cpu15  cpumap  distance  meminfo  numastat

I think sysfs remains the best way to view your NUMA nodes.

Sylvain

On Wed, 2 Nov 2005, Daniel J Blueman wrote:

> I'm not sure of the true answer; it is likely that CPUSETS was
> designed in the 2.4 timeframe and compatibility was preferred over the
> clean sysfs interface.
> 
> I've CC'd the authors.
> 
> Dan
> 
> On 11/2/05, Randy.Dunlap <rdunlap@xxxxxxxxxxxx> wrote:
> > On Wed, 2 Nov 2005, Daniel J Blueman wrote:
> > >
> > > Janos,
> > >
> > > You can see what valid memory nodes are available from the top-level
> > > cpuset directory:
> > >
> > > # cat /dev/cpuset/mems
> > > 0 1 2 3
> > >
> > > If you were to be running on a NUMA-capable system, you'd also want to
> > > ensure page interleaving was disabled in the BIOS/pre-boot firmware
> > > too.
> >
> > Just for info, why is this in /dev at all, instead of, say,
> > /sys ??
> >
> > --
> > ~Randy
> ___
> Daniel J Blueman
> 




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