VML 32-bit/64-bit performance

[Robert_E_1]

Can you tell me if the VML performance tables at https://software.intel.com/sites/products/documentation/doclib/mkl/vm/functions/_performanceall.html were measured using the 32-bit mode or the 64-bit mode of the processor?

[Zhen_Z_Intel]

Hi Robert,

I've took your thread and still investigate on it. I notice you created a new ticket with similar issues. May I close the new one and answer it in this thread?

Best regards,
Fiona

[Robert_E_1]

Hi Fiona -- By "new ticket" do you mean "Accuracy/performance of Intel Math Library"?  This is about a different library, so it may be a bit confusing to others if it is answered under this thread.  But I have no objection if you wish to do so.  Robert

[Marius_C_Intel · Accepted solution]

Hello Robert,

The numbers posted are of 64-bit mode

Marius

[Robert_E_1]

Hi Marius -- Thanks very much for the reply.  Would you be able to tell me whether you expect similar performance from the 32-bit version of the VML library, or would there be significant differences?

[Marius_C_Intel]

Robert,

Yes, I would expect similar numbers. However, at least for some functions I would expect somewhat (but not drastically) lower performance in 32-bit mode than in 64-bit, mainly because in 32-bit mode fewer registers are used, and some will be of smaller size.

Marius

[Robert_E_1]

Thanks Marius.  Robert