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by j2labs
5180 days ago
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tl;dr - If you're running a database, or generally memory intensive system, while also using multiple CPUs you should run this command: echo 0 > /proc/sys/vm/zone_reclaim_mode But the article is great. You should definitely read it. |
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From the article:
"An aside on zone_reclaim_mode
The zone_reclaim_mode tunable in /proc/sys/vm can be used to fine-tune memory reclamation policies in a NUMA system. Subject to some clarifications from the linux-mm mailing list, it doesn’t seem to help in this case."
The real TL;DR is "run your mysql command under the auspices of '/usr/bin/numactl --interleave all' so that your big pool allocation is split evenly across nodes"
And an even better solution would be if _only_ the big pool allocation use interleaved allocation, and all the rest used normal node-bound allocation. This would require some sort of change to the malloc calls though, yes? All of the solutions listed in the article operate at the granularity of a process (or higher), not down to the individual allocation.