topic mkl_cbwr_set() not working as expected in 2020.1.217 in Intel® oneAPI Math Kernel Library

mkl_cbwr_set() not working as expected in 2020.1.217

Matthew_G_Intel1 — Sun, 30 Jan 2022 21:15:17 GMT

In my code, I set ::mkl_cbwr_set(MKL_CBWR_AVX);

With MKL 2020.1.217, I found that MKL FFTs produce different results on CoffeeLake and RocketLake CPUs.

I do not see this issue with MKL 2021.3.0.

Question 1: Is this a known issue in MKL 2020.1.217?

Question 2: What version of MKL did this issue first occur in?

Question 3: What version of MKL was it fixed in?

Thanks!

Re:mkl_cbwr_set() not working as expected in 2020.1.217

Gennady_F_Intel — Thu, 03 Feb 2022 04:44:35 GMT

Matt, the problem has been fixed in MKL 2020 update 4.

Re:mkl_cbwr_set() not working as expected in 2020.1.217

Gennady_F_Intel — Fri, 04 Feb 2022 04:16:56 GMT

The thread is closing and we will no longer respond to this thread. If you require additional assistance from Intel, please start a new thread. Any further interaction in this thread will be considered community only.

Re: mkl_cbwr_set() not working as expected in 2020.1.217

Matthew_G_Intel1 — Fri, 04 Feb 2022 16:09:40 GMT

Just as reference to anybody looking at this topic, we found these inconsistent CNR results on IceLake & RocketLake CPUs, but not on SkyLake, KabyLake, or CoffeeLake.

Affected MKL versions seem to start with 2020 Gold, and was fixed in 2020u4 as Gennady mentioned above.