Is NUMA balancer enabled by default in recent Linux versions? If so how can I disable the NUMA balancer please let me know.
Numa balancer in Linux
11.1k Views Asked by Pradeep Jagadeesh At
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Hristo Iliev
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The automatic NUMA balancing can be disabled by passing the numa_balancing=disable parameter to the kernel. The exact way of doing so depends on the boot loader in use. The same parameter could be controlled via the kernel.numa_balancing sysctl:
echo 0 > /proc/sys/kernel/numa_balancing
or
sysctl -w kernel.numa_balancing=0
It could also be set in /etc/sysctl.conf on distributions that process that file.
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This depends on which distribution you are on and the underlying hardware. NUMA should be enabled in the BIOS. To check if NUMA is disabled on your linux use:
this returns No NUMA configuration found, when NUMA enabled, dmesg does not show any information of NUMA initialization.
If NUMA is enabled in BIOS, then execute the command
numactl --hardwareto list the available nodes on the system.Note, you can also set
numa=offto disable ingrub.conf, but its best to change it using BIOS settings.