On 28/03/2012 16:57, Tyson Whitehead wrote:
On March 28, 2012 04:41:16 Simon Marlow wrote:
Sure. Do you have a NUMA machine to test on?
My understanding is non-NUMA machines went away when the AMD and Intel moved
away from frontside buses (FSB) and integrated the memory controllers on die.
Intel is more recent to this game. I believe AMD's last non-NUMA machines
where the Athalon XP series and Intel's the Core 2 series.
An easy way to see what you've got is to see what 'numactl --hardware' says.
If the node distance matrix is not uniform, you have NUMA hardware.
As an example, on a 8 socket Opteron machine (32 cores) you get
$ numactl --hardware
available: 8 nodes (0-7)
node 0 size: 16140 MB
node 0 free: 3670 MB
node 1 size: 16160 MB
node 1 free: 3472 MB
node 2 size: 16160 MB
node 2 free: 4749 MB
node 3 size: 16160 MB
node 3 free: 4542 MB
node 4 size: 16160 MB
node 4 free: 3110 MB
node 5 size: 16160 MB
node 5 free: 1963 MB
node 6 size: 16160 MB
node 6 free: 1715 MB
node 7 size: 16160 MB
node 7 free: 2862 MB
node distances:
node 0 1 2 3 4 5 6 7
0: 10 20 20 20 20 20 20 20
1: 20 10 20 20 20 20 20 20
2: 20 20 10 20 20 20 20 20
3: 20 20 20 10 20 20 20 20
4: 20 20 20 20 10 20 20 20
5: 20 20 20 20 20 10 20 20
6: 20 20 20 20 20 20 10 20
7: 20 20 20 20 20 20 20 10
Well, you learn something new every day! On the new 32-core Opteron box
we have here:
available: 8 nodes (0-7)
node 0 cpus: 0 4 8 12
node 0 size: 8182 MB
node 0 free: 1994 MB
node 1 cpus: 16 20 24 28
node 1 size: 8192 MB
node 1 free: 2783 MB
node 2 cpus: 3 7 11 15
node 2 size: 8192 MB
node 2 free: 2961 MB
node 3 cpus: 19 23 27 31
node 3 size: 8192 MB
node 3 free: 5359 MB
node 4 cpus: 2 6 10 14
node 4 size: 8192 MB
node 4 free: 3030 MB
node 5 cpus: 18 22 26 30
node 5 size: 8192 MB
node 5 free: 4667 MB
node 6 cpus: 1 5 9 13
node 6 size: 8192 MB
node 6 free: 3240 MB
node 7 cpus: 17 21 25 29
node 7 size: 8192 MB
node 7 free: 4031 MB
node distances:
node 0 1 2 3 4 5 6 7
0: 10 16 16 22 16 22 16 22
1: 16 10 16 22 22 16 22 16
2: 16 16 10 16 16 16 16 22
3: 22 22 16 10 16 16 22 16
4: 16 22 16 16 10 16 16 16
5: 22 16 16 16 16 10 22 22
6: 16 22 16 22 16 22 10 16
7: 22 16 22 16 16 22 16 10
The node distances on this box are less uniform than yours.
Cheers,
Simon
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