Unix and Linux Stack Exchange
Unix and Linux Stack Exchange

Questions tagged [numa]

25 questions
24
votes
5 answers

Enabling NUMA for Intel Core i7

In Linux kernel, the documentation for CONFIG_NUMA says: Enable NUMA (Non Uniform Memory Access) support. he kernel will try to allocate memory used by a CPU on the local memory controller of the CPU and add some more NUMA awareness to the…
user1968963
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1 answer

How to migrate all the memory pages of a process from one NUMA node to another NUMA node?

In Linux, I want to migrate the memory pages of a KVM virtual machine from one NUMA node to another NUMA node on runtime. But I cannot find any interfaces to do that in the KVM hypervisor or using the libvirt API. Then I tried to use the…
Jenson
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9
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2 answers

How to disable one CPU

I'm trying to disable some CPUs of my server. I've found this link: https://www.cyberciti.biz/faq/debian-rhel-centos-redhat-suse-hotplug-cpu/linux-turn-on-off-cpu-core-commands/, which offers me a method as below: Here is what numactl --hardware…
Yves
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8
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3 answers

How to disable memory for a NUMA node on a Linux system

Is there a way to disable access to memory associated with a given NUMA node/socket on a NUMA machine? We have a bit of controversy with the database vendor about our HP DL560 machines. The DB sales type’s technical support person was animated that…
user1683793
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6
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1 answer

Globally setting CPU affinity

Is there a way to make all processes, except the ones I intentionally set otherwise with taskset or numactl use only certain cores/memory (without looping through every thread of every process and setting it myself)? A few more details: I have 2…
thaimin
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4
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1 answer

How do I run a service with numactl

I need to do something like this to run MongoDB $numactl --interleave=all /usr/bin/mongod --config /etc/mongod.conf & What should I change to be able to run the mongo daemon with the options above?
Bob
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0 answers

Using shared memory through tmpfs and NUMA on x86_64/Linux

Here's what I'd like to do: put a file on tmpfs but ensure that all of it (all pages of it) ends up on the same NUMA node. First, I thought this would be trivial: I'd just mmap() a tmpfs file with MAP_SHARED and then use mbind() to tie it to the…
Lajos Nagy
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2
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1 answer

Processes ignore global CPUAffinity settings

I am setting global CPUAffinity via /etc/systemd/system.conf. See snippet below: root@PC1-03:~# cat /etc/systemd/system.conf # This file is part of systemd. # # systemd is free software; you can redistribute it and/or modify it # under the terms…
Trevor K Smith
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2
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1 answer

Why does a 2-socket server show PCIe locations but the 4-socket server does not (how can I find the PCIe locations on the 4-socket server)?

I have two servers: 2 socket Supermicro X9DBL-3F 4 socket Supermicro X10QBI When I run hwloc-ls for the 2-socket server I see the PCIe topology with the HostBridges on each NUMANode, but the 4-socket server shows Packages instead of NUMANodes and…
KJ7LNW
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1 answer

Does Linux's NUMA architecture shares main memory as well?

I am reading about NUMA (Non-uniform memory access) architecture. It looks like this is the hardware architecture that on the multiprocessor system, each core accesses their internal local memory is faster than the remote memory. The thing I don't…
hqt
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2
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0 answers

Allocate pools of hugepages separately on each NUMA doamin

On my dual-socket machine, I'm trying to allocated two pools of hugepages (one for each socket), so that the application A, which is pinned on the first socket, uses the first pool, and the application B on the second socket uses it's own local…
Vahid Noormofidi
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2
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1 answer

Where does the default numa setting come from?

when we run: numactl --hardware we can see the current status of numa setting. However, it seems not set by Linux ( at least, I didn't add a parameter to set it ). Did it set by BIOS?
Mark
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1 answer

Sub-process returned an error code when apt-get install package

sudo apt-get install numactl E: Problem executing scripts APT::Update::Post-Invoke-Success '/usr/bin/test -e /usr/share/dbus-1/system-services/org.freedesktop.PackageKit.service && /usr/bin/test -S /var/run/dbus/system_bus_socket && /usr/bin/gdbus…
showkey
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1 answer

Find out where the allocated memory for a process resides

I would like to investigate where the memory for a specific process is allocated. To be more specific: I am running an OpenMP parallel Fortran binary on a ccNUMA machine with two physical CPUs. My concern is that this program violates the first…
MechEng
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1 answer

NUMA aware caching on linux

This is a follow-up question to dentry/inode caching on multi-cpu machines / memory allocator configuration, but here I try to put the question differently. My problem is that I have a dual socket machine, and memory for the kernel caches…
LaszloLadanyi
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