Ryzen for gurobi

Answered

Cris

• February 17, 2021 17:41
• Edited

Hello. I hope how read this massage has a good day. Recently I bought a new laptop. It has a ryzen 4800H and I saw this CPU outperform all i7 with the same specs in a lot of benchmarks. When I tryed to use this new pc with numpy (in anaconda), I was very disappointed. It performs too much slower than my old intel cpu. I read about mkl vs openblast and intel wins with mkl because it is developed by intel. I would like to know how I can use all resources in my pc if I have a ryzen CPU. When I tryed numpy it only used 20% of the cpu with ryzen. When I run the same script on intel it used 100% so now I want to know if happens the same on gurobi and how I can fixe it. 

Best regards and thanks as always,

Cristian.  

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• 

  Jaromił Najman

  Gurobi Staff

  • March 01, 2021 12:42
  • Edited

  Hi Cristian,

  This should not happen with Gurobi unless you are using the Barrier algorithm. The Barrier algorithm uses the MKL library which is currently best supported by Intel CPUs. However, in Gurobi, an internal environment variable is set to circumvent this obstacle and activate all features for AMD processors. Still, it might happen that the default environment variable is not set properly blocking some features. For more information, please refer to How to Use MKL with AMD Ryzen and Threadripper CPU's (Effectively) for Python Numpy (And Other Applications).

  Best regards,
  Jaromił

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  Cris

  • March 03, 2021 01:39

  

  

  

  Thanks for your answer Jaromił. I was reading some post and it looks like the environment variable is not useful with the new version of mkl. 

  I am not clear with what you tell me about the environment variable for gurobi. It is the same solution as the publish on the post you have left me? Or is an internal option in gurobi settings. (sorry if I am not clear but I am new with this kind of stuf).

  Best regards and thanks for your help,

  Cristian.

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  Jaromił Najman

  Gurobi Staff

  • March 03, 2021 07:15

  Hi Cristian,

  I am not clear with what you tell me about the environment variable for gurobi. It is the same solution as the publish on the post you have left me?

  Yes, Gurobi just defines its own variable, which does the same as in the post. It is not a Gurobi setting.

  Best regards,
  Jaromił

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  Cris

  • March 08, 2021 01:28

  

  

  

  What version of Intel MKL runs gurobi??

  I read 2020.2 version has removed the environment variable solution.

  Best regards,

  Cristian

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  Jaromił Najman

  Gurobi Staff

  • March 08, 2021 11:04

  Hi Cristian,

  Gurobi currently uses a previous version of MKL, where the environment variable solution is still feasible.

  Best regards,
  Jaromił

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