topic Re: Node size in Operating System - Linux

Node size

heartbreakkid — Fri, 30 Apr 2010 10:30:01 GMT

Hi,

Does the output of the command
numactl --hardware

available: 1 nodes (0-0)
node 0 cpus: 0 1
node 0 size: 8155 MB
node 0 free: 3231 MB
No distance information available.

where,
node 0 size: 8155MB
mean that the local memory associated with node 0 is 8155MB?
Can anyone guide me please?

Re: Node size

Matti_Kurkela — Sat, 01 May 2010 10:07:07 GMT

Yes, it looks like it means exactly that.

Furthermore, as your system currently seems to have all its CPU & memory resources in one node, it might not be a NUMA system at all, or at least the Linux kernel does not recognize it as such.

Your "numactl --hardware" output looks exactly the way I would expect it in a system that has no NUMA hardware features, but is currently running a Linux kernel that can support NUMA if necessary.

MK

Re: Node size

P Muralidhar Kini — Sat, 01 May 2010 14:04:10 GMT

Hi,

>> mean that the local memory associated with node 0 is 8155MB?
Yes. Thats what the output means.

But in your case there is only one node, so all the resources would be local
to that node. There is nothing NUMA about it.

Is it a NUMA system ?
If it is then is there any reason why it is configured with only one node?

Refer the following link for more details -
http://www.halobates.de/numaapi3.pdf

As a side note, your user name "heartbreakkid" reminds me of WWE superstar
Shawn Michael!

Regards,
Murali