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111alan
Novice
189 Views

Much lower memory bandwidth with NUMA disabled

Since some applications could not effectively utilize more than one NUMA node, I'm testing the situation when NUMA was disabled with a 2S 12-channel DDR4-2666 cascadelake-sp system. 

The memory latency impact was expected, but the bandwidth was also severely lowered to about 73GB/s, that is 1/3 the bandwidth of the same system with NUMA enabled, or almost half that of a 1S system.

Why disabling NUMA has such huge effect on memory bandwidth, even more than on latency? Are there anything I can do to improve on this? Thanks.8259CLx2_mlc.JPG

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4 Replies
Maria_R_Intel
Moderator
185 Views

Thank you for posting on the Intel* Community.


To better assist you, please provide us with the below information:


  • Are you using a server system? (provide details)
  • Provide the specific CPU model on your system.


Best regards, 

Maria R.  

Intel Customer Support Technician 


Maria_R_Intel
Moderator
168 Views

Hello 111alan,


Were you able to check the previous post? 


Let me know if you need more assistance. 


Best regards, 

Maria R.  

Intel Customer Support Technician 


111alan
Novice
164 Views

Currently waiting Emeth to check out the situation. Thank you for the assistance.

Maria_R_Intel
Moderator
157 Views

Hello 111alan,


Thank you for let us know, we're glad to hear that.


In this case, we will proceed to close this thread to avoid duplication of effort and the support will continue through the current case with Emeth.


Best regards,

Maria R.

Intel Customer Support Technician


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