On Mon, May 10, 2010 at 08:32:55PM +0200, Karel Zak wrote:
> On Sun, Apr 25, 2010 at 01:21:04PM -0400, Jon Stanley wrote:
> > When trying to discover the NUMA topology of a system in a script, for
> > example. lscpu -p seems the perfect format to do so. However, it's not
> > accurate, because the CPU identifiers given in the first column bear
> > no relation whatsoever to the actual CPU's as seen by the OS.
>
> I can confirm this bug. It's reproducible with data from your /sys.
The problem should be fixed in the git tree. Please, if you want to
try it:
git clone git://git.kernel.org/pub/scm/utils/util-linux-ng/util-linux-ng.git
cd util-linux-ng
./autogen.sh
./configure
make -C sys-utils/ lscpu
sys-utils/lscpu -p
> > [root@etc752754a sys-utils]# ./lscpu -p
> > # The following is the parsable format, which can be fed to other
> > # programs. Each different item in every column has an unique ID
> > # starting from zero.
> > # CPU,Core,Socket,Node,,L1d,L1i,L2,L3
> > 0,0,0,0,,0,0,0,0
> > 1,0,0,0,,0,0,0,0
> > 2,1,0,0,,1,1,1,0
> > 3,1,0,0,,1,1,1,0
> > 4,2,0,0,,2,2,2,0
> > 5,2,0,0,,2,2,2,0
> > 6,3,0,0,,3,3,3,0
> > 7,3,0,0,,3,3,3,0
> > 8,4,1,1,,4,4,4,1
> > 9,4,1,1,,4,4,4,1
> > 10,5,1,1,,5,5,5,1
> > 11,5,1,1,,5,5,5,1
> > 12,6,1,1,,6,6,6,1
> > 13,6,1,1,,6,6,6,1
> > 14,7,1,1,,7,7,7,1
> > 15,7,1,1,,7,7,7,1
The new output:
$ lscpu --sysroot ~/x86_64-dellr710/
Architecture: x86_64
CPU op-mode(s): 32-bit, 64-bit
CPU(s): 16
Thread(s) per core: 2
Core(s) per socket: 4
CPU socket(s): 2
NUMA node(s): 2
Vendor ID: GenuineIntel
CPU family: 6
Model: 26
Stepping: 5
CPU MHz: 2527.073
Virtualization: VT-x
L1d cache: 32K
L1i cache: 32K
L2 cache: 256K
L3 cache: 8192K
NUMA node0 CPU(s): 0,2,4,6,8,10,12,14
NUMA node1 CPU(s): 1,3,5,7,9,11,13,15
$ ./sys-utils/lscpu -p --sysroot ~/x86_64-dellr710/
# The following is the parsable format, which can be fed to other
# programs. Each different item in every column has an unique ID
# starting from zero.
# CPU,Core,Socket,Node,,L1d,L1i,L2,L3
0,0,0,0,,0,0,0,0
1,1,1,1,,1,1,1,1
2,2,0,0,,2,2,2,0
3,3,1,1,,3,3,3,1
4,4,0,0,,4,4,4,0
5,5,1,1,,5,5,5,1
6,6,0,0,,6,6,6,0
7,7,1,1,,7,7,7,1
8,0,0,0,,0,0,0,0
9,1,1,1,,1,1,1,1
10,2,0,0,,2,2,2,0
11,3,1,1,,3,3,3,1
12,4,0,0,,4,4,4,0
13,5,1,1,,5,5,5,1
14,6,0,0,,6,6,6,0
15,7,1,1,,7,7,7,1
Karel
--
Karel Zak <kzak@xxxxxxxxxx>
http://karelzak.blogspot.com
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