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--- wiki:workaround_for_bug_41288_-_performances_controlling_numa_core_operation [2016/12/01 10:26] – walkeradmin
+++ wiki:workaround_for_bug_41288_-_performances_controlling_numa_core_operation [2023/03/09 22:35] (current) – external edit 127.0.0.1
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-===== WORKAROUND for Bug 41288 [Performances] NUMA Core Operation =====
+====== Workaround for Bug 41288 [Performances] ======
+<color blue>NUMA Core Operation</color>
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 This Advanced Parameter controls the NUMA configuration on the MFEL. For this to work the NUMA settings in the BIOS must have been correctly configured.
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 If the NUMA Node is set to <color red>false</color>, then this will allow a service to use both NUMA Nodes (so both CPUs, and all memory). This is important if a service has a lot of components (say an ABR service with a lot of profiles) that could be too much for a single processor to handle.
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+<color red>When setting NUMA to false, you might get a performance improvement if you set the NUAM to of in the BIOS</color>
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-{{:wiki:numa_cores_htop_001.png?800|}}
+{{:wiki:numa_cores_htop_0001.jpg?800|}}
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-{{:wiki:numa_cores_htop_002.png?800|}}
+{{:wiki:numa_cores_htop_0002.jpg?800|}}
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+----
+==== Processor Occupancy ====
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+We know that there are many cores (CPUs) per socket, and these cores are allocated by the operating system. However the allocation of processor cores isn't actually that random.
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+{{:wiki:processor_order_slope.jpg?200|}}
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+The diagram above shows one of the NUMA cores, and it can be seen that the cores are used in order, and that core 1 is always the most used core, while the lower cores may get only the occasional use. This of course doesn't mean much, but it is interesting to know.
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+<color red>When setting NUMA to false, you might get a performance improvement if you set the NUMA to off in the BIOS</color>
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