Questions tagged [numa]

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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 ...
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0answers
31 views

SMP machines using NUMA

In What Every Programmer Should Know About Memory U. Drepper says the following on p. 4: Commodity NUMA machines exist today and will likely play an even greater role in the future. It is expected ...
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1answer
277 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
224 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 ...
0
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1answer
538 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
16 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
2k 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 ...
3
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1answer
1k 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 ...
17
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2answers
43k 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
37 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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4answers
27k 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
92 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 ...