Questions tagged [numa]
14 questions
26
votes
3 answers
Is the amount of NUMA nodes always equal to sockets?
I have used lscpu to check two servers configuration:
[root@localhost ~]# lscpu
Architecture: x86_64
......
Core(s) per socket: 1
Socket(s): 1
NUMA node(s): 1
Vendor ID: GenuineIntel
CPU family: …
Nan Xiao
- 4,133
17
votes
5 answers
Determine PCIe device NUMA node
Assuming fairly recent Linux OS, is there an easy way to determine to which NUMA node the PCIe slot, where a device is plugged in, belongs?
user49531
5
votes
1 answer
Mapping of memory addresses to physical modules in Windows XP
I plan to run 32-bit Windows XP on a workstation with dual processors, based on Intel's Nehalem microarchitecture, and triple channel RAM. Even though XP is limited to 4 GB of RAM, my understanding is that it will function with more than 4 GB…
Josef Grahn
- 153
3
votes
1 answer
How can I change the distribution of Cores across NUMA-nodes?
On Ubuntu 14.04 TLS for 36 total cores = (2 x CPUs x 9 Cores x 2 HyperThreading), lscpu give me:
Architecture: x86_64
CPU op-mode(s): 32-bit, 64-bit
Byte Order: Little Endian
CPU(s): 36
On-line CPU(s) list: …
Alex
- 131
3
votes
2 answers
Cache coherence literature for big (>=16CPU) systems
What books and articles can you recommend to learn basis of cache coherence problems in big SMP systems (which are NUMA and ccNUMA really) with >=16 cpu sockets?
Something like SGI Altix architecture analysis may be interesting.
What protocols…
osgx
- 7,017
2
votes
2 answers
Running an application across two nodes with Windows Server with NUMA
I had an interesting call with a client today. We have an application which schedules other apps, and normally we have no trouble at all with servers with NUMA configuration with anywhere from 2 to 4 nodes.
On the call, we started up two very CPU…
RandomInsano
- 326
1
vote
2 answers
Should I use NUMA or SMP with Vista 64-bit?
My Dell Precision T5500 workstation has an option in the BIOS for changing the memory mode between SMP and NUMA.
Which of these options should I use with Vista 64-bit? Does Vista support NUMA?
From what I understand the hardware I have is natively…
pauldoo
- 626
1
vote
1 answer
Why does the count of NUMA Nodes Influence Processor grouping
On a HPE DL380 G10 Server with 2 Xeon(R) Gold 6246R (32 phys. Cores, 64 log. with HT), in the BIOS, using this setting:
System Configuration > BIOS/Platform Configuration (RBSU) >
Performance Options > Advanced Performance Tuning Options > NUMA…
Harry
- 327
1
vote
1 answer
Information About Named Shared Memory in /dev/shm
Let's say I see a file called /dev/shm/some.segment
How can I find out (with command lines):
The processes that are linked to it?
The NUMA node it locates?
For #2, I can write a small C program with move_pages() to find out. Just wonder whether…
HCSF
- 175
0
votes
0 answers
Is there a way to run a job exclusively on a chip?
We've got a bunch of large (1TB+) NUMA machines at work and have been getting a lot of noise in benchmarking. We've noticed that run times for our application are very consistent from one run to the next when there is nothing else running on the…
dromodel
- 307
0
votes
1 answer
How to create a NUMA topology in single system environment
I want to know if it possible to create a NUMA topology(2 NUMA nodes is also fine) in a single system environment (I'm using virtualbox ubuntu 18.04).
When I run $numactl -H, I see the following
available: 1 nodes (0)
node 0 cpus: 0 1 2 3
node 0…
srccode
- 101
0
votes
0 answers
How does multi cpu system shares pci-express bus?
For a modern single-cpu system things are transparent: there is multicore cpu, where cores are talking via uncore functions (like L3 cache, shared on-die memory controller). Uncore does also all the handling pci-e bus functions, providing access to…
xakepp35
- 439
0
votes
0 answers
Using vmware images with numa suppprt
I want to demonstrate Linux numa system with 2 virtual machine images running linux
What is the best way and the correct distribution to use?
Liran Ben Haim
- 101
-1
votes
1 answer
Memory distribution in NUMA nodes does not add up to system memory
I recently started working on systems with NUMA nodes, and noticed something strange.
/proc/meminfo shows the sytem has 128461 MB
[root@nfvis node]# head -n4 /proc/meminfo
MemTotal: 131544388 kB
MemFree: 334016 kB
MemAvailable: 49968 kB
Buffers:…
shriroop_
- 49