Why I don't see Node 0 when running numstat on one specific F23 server

Why I don't see Node 0 when running numstat on one specific F23 server

[Kevin Wilson]

Hello, Linux numa experts,

I have a server running F23 64 bit.
When I run
numastat
I see only node 1.

On two other machines, I do see node 0 and not 1 (and in fact I think
that this is the same for all the machines on which I have access in
the past, which is quite a large number).

What is the reason for this ? is it configurable somehow (BIOS, kernel
command line, etc)? could it bee
a problem with RAM/HW on that specific machine?

Regards,
Kevin

Re: Why I don't see Node 0 when running numstat on one specific F23 server

[David Rientjes]

On Sun, 27 Mar 2016, Kevin Wilson wrote:

> Hello, Linux numa experts,
> 
> I have a server running F23 64 bit.
> When I run
> numastat
> I see only node 1.
> 
> On two other machines, I do see node 0 and not 1 (and in fact I think
> that this is the same for all the machines on which I have access in
> the past, which is quite a large number).
> 
> What is the reason for this ? is it configurable somehow (BIOS, kernel
> command line, etc)? could it bee
> a problem with RAM/HW on that specific machine?
> 

It's possible and allowed to only have node 1 (node 0 is hotpluggable on 
some configs), please send your dmesg if you'd like us to have a look.

Re: Why I don't see Node 0 when running numstat on one specific F23 server

[Kevin Wilson]

Hi, Bill,

Sorry for the late response:

Here is the output for the three commands you asked for:
-----
numastat  -cm

Per-node system memory usage (in MBs):
                 Node 1 Total
                 ------ -----
MemTotal          12006 12006
MemFree            2628  2628
MemUsed            9379  9379
Active              523   523
Inactive            284   284
Active(anon)        249   249
Inactive(anon)       17    17
Active(file)        274   274
Inactive(file)      267   267
Unevictable           0     0
Mlocked               0     0
Dirty                 0     0
Writeback             0     0
FilePages           559   559
Mapped              165   165
AnonPages           248   248
Shmem                18    18
KernelStack           7     7
PageTables           21    21
NFS_Unstable          0     0
Bounce                0     0
WritebackTmp          0     0
Slab                145   145
SReclaimable        105   105
SUnreclaim           40    40
AnonHugePages         0     0
HugePages_Total    8192  8192
HugePages_Free        0     0
HugePages_Surp        0     0
---


lscpu
Architecture:          x86_64
CPU op-mode(s):        32-bit, 64-bit
Byte Order:            Little Endian
CPU(s):                16
On-line CPU(s) list:   0-15
Thread(s) per core:    2
Core(s) per socket:    4
Socket(s):             2
NUMA node(s):          1
Vendor ID:             GenuineIntel
CPU family:            6
Model:                 26
Model name:            Intel(R) Xeon(R) CPU           X5570  @ 2.93GHz
Stepping:              5
CPU MHz:               1862.000
CPU max MHz:           2927.0000
CPU min MHz:           1596.0000
BogoMIPS:              5865.83
Virtualization:        VT-x
L1d cache:             32K
L1i cache:             32K
L2 cache:              256K
L3 cache:              8192K
NUMA node1 CPU(s):     0-15
Flags:                 fpu vme de pse tsc msr pae mce cx8 apic sep
mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht
tm pbe syscall nx rdtscp lm constant_tsc arch_perfmon pebs bts
rep_good nopl xtopology nonstop_tsc aperfmperf pni dtes64 monitor
ds_cpl vmx est tm2 ssse3 cx16 xtpr pdcm dca sse4_1 sse4_2 popcnt
lahf_lm ida dtherm tpr_shadow vnmi flexpriority ept vpid
---

numactl --hardware
available: 1 nodes (1)
node 1 cpus: 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
node 1 size: 12006 MB
node 1 free: 2612 MB
node distances:
node   1
  1:  10

Thanks,
Kevin


On Mon, Mar 28, 2016 at 11:55 PM, Bill Gray <bgray@redhat.com> wrote:
> Hi Kevin,
>
> Could you please send me the output from "numastat -cm", "lscpu" and also
> from "numactl --hardware"?   Thanks!
>
> -- Bill
>
>
> On Sun, Mar 27, 2016 at 10:30 AM, Kevin Wilson <wkevils@gmail.com> wrote:
>>
>> Hello, Linux numa experts,
>>
>> I have a server running F23 64 bit.
>> When I run
>> numastat
>> I see only node 1.
>>
>> On two other machines, I do see node 0 and not 1 (and in fact I think
>> that this is the same for all the machines on which I have access in
>> the past, which is quite a large number).
>>
>> What is the reason for this ? is it configurable somehow (BIOS, kernel
>> command line, etc)? could it bee
>> a problem with RAM/HW on that specific machine?
>>
>> Regards,
>> Kevin
>> --
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>
>