PetscOverrideIntelMKLCPUVendorDetection

a macro to override Intel MKL’s CPU vendor detection routines

Note

Intel MKL may detect the CPU vendor at runtime and select less optimized code paths on non-Intel CPUs, such as AMD processors. A common workaround is to intercept MKL’s CPU detection functions (mkl_serv_intel_cpu_true() or mkl_serv_get_cpu_true()) and force them to report that the processor is an Intel CPU, thus enabling the optimized code paths of MKL.

Put PetscOverrideIntelMKLCPUVendorDetection(); before main(), and then compile and link the main object file before the MKL libraries (which is typically already the case). See https://danieldk.eu/software/misc/intel-mkl-on-amd-zen.

See Also

PetscInitialize()

Level

developer

Location

include/petscsys.h

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