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regnak2012
Journeyman III
‎10-30-2012 03:58 AM

6276 16 core AMD CPU vs NUMA

Hi,

How many cores are part of a NUMA node in the 16 core AMD processors, is it 8? I'm planning a VMware environment on a server with 2 x 6276 CPU's and 256GB Ram and need to know when a virtual machine spans NUMA nodes. This has an impact on performance.

Thank you

Michael.

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1 Solution
avk
Adept III
‎12-09-2012 01:24 AM

Yes, Michael, every node in the 16-core AMD Opterons has 8 cores. BTW, this information can be obtained by requesting CPUID.8000_001E and inspecting ECX register, 10..8 bits. The count of nodes is encoded in "minus - 1" form, so 0 means 1, 1 means 2, etc. After this, you can divide the logical processor count (CPUID.0000_0001.EBX[23..16]) by the node count, and voila - you get the number of cores per node.

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2 Replies
avk
Adept III
‎12-09-2012 01:24 AM

Yes, Michael, every node in the 16-core AMD Opterons has 8 cores. BTW, this information can be obtained by requesting CPUID.8000_001E and inspecting ECX register, 10..8 bits. The count of nodes is encoded in "minus - 1" form, so 0 means 1, 1 means 2, etc. After this, you can divide the logical processor count (CPUID.0000_0001.EBX[23..16]) by the node count, and voila - you get the number of cores per node.

regnak2012
In response to avk
Journeyman III
‎12-21-2012 03:27 AM

Thanks avk!

Much appreciated,

Regards,

Mike

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