[petsc-users] using intel mkl for optimized blas/lapack on amd nodes

[Pierre Jolivet]

The libfakeintel.so <https://urldefense.us/v3/__http://libfakeintel.so/__;!!G_uCfscf7eWS!bSuPjhB4YML6KMVUaPPLNST5KPen-7_1fwZ4ZQOjJRo4oxNXqPVG-kHukhNSni7bEbvwnpMNfHLAs7BhuT-4Xg$ > trick is as old as I can remember and it is available in all computing centers I’m using.
But it’s the duty of the users to preload it (again, on computing centers I have access to, module load’ing the MKL on AMD nodes automatically sets LD_PRELOAD).

Thanks,
Pierre

> On 4 Jun 2026, at 4:52 PM, Junchao Zhang <junchao.zhang at gmail.com> wrote:
> 
> Richard, do you want to trick Intel?
> 
> --Junchao Zhang
> 
> 
> On Thu, Jun 4, 2026 at 2:29 AM Klaij, Christiaan via petsc-users <petsc-users at mcs.anl.gov <mailto:petsc-users at mcs.anl.gov>> wrote:
>> I came across this issue:
>> 
>> https://urldefense.us/v3/__https://danieldk.eu/software/misc/intel-mkl-on-amd-zen__;!!G_uCfscf7eWS!bSuPjhB4YML6KMVUaPPLNST5KPen-7_1fwZ4ZQOjJRo4oxNXqPVG-kHukhNSni7bEbvwnpMNfHLAs7Dwqqckeg$  <https://urldefense.us/v3/__https://danieldk.eu/software/misc/intel-mkl-on-amd-zen__;!!G_uCfscf7eWS!fsSSG7b4cHz_fsk3H-3DI4kIopw4fIp1MW93aPTq10vZnZKOx1t7cEg2g4MbGyxZXr15OMM0jg0UU0q2p5ktYkQ$>
>> 
>> We do configure petsc with the intel mkl for optimized
>> blas/lapack using --with-blas-lapack-dir=${MKL_DIR}.
>> 
>> How much would this issue affect the performance of petsc on amd
>> nodes? Do you have the proposed workaround in place?
>> 
>> Chris
>> <image455803.png>
>> ​​​​
>> dr. ir. 	Christiaan	 Klaij	 | 	senior researcher	
>> Research & Development	 | 	CFD Development
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