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Questions tagged [numa]

The tag has no usage guidance.

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19 views

Why are my CPU cores distributed over two NUMA nodes?

When I look at the output of lscpu I am used to seeing output similar to this: NUMA node0 CPU(s): 0-8,18-26 NUMA node1 CPU(s): 9-17,27-35 However, I am working on a server at the moment, and ...
0
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1answer
67 views

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 ...
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0answers
25 views

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 ...
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0answers
30 views

What does NUMA node distance signify?

I have a processor with 4 NUMA nodes. When I access the distance information on each of the nodes, I get the output as in the image here. From the first look, it appears that it signifies relative ...
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0answers
51 views

Bind Numa nodes to a socket

I am a noob in vNUMA nodes ESXI vsphere. I know that each vNUMA node should be associated with a socket ID. Are there any settings for a virtual ubuntu machine for enabling NUMA nodes? I have 1 numa ...
0
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1answer
245 views

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 ...
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0answers
34 views

Can increasing cores per virtual socket improve VM efficiency? [closed]

I am looking at how CPUs are configured in ESXI 6.7.0 Processor is Xeon Gold 6140, 72 logical processors. Looking at VMs and the CPU counts, I was intrigued to see for instance 4 vCPUs, 1 cores per ...
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0answers
12 views

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?
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2answers
963 views

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 ...
4
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1answer
581 views

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 ...
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2answers
34k views

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 ...
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0answers
33 views

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 ...
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3answers
21k views

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?
5
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1answer
1k views

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 ...
3
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2answers
90 views

Cache coherence literature for big (>=16CPU) systems [closed]

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 ...
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2answers
4k views

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 ...