topic Andrew, please check how it in Intel® oneAPI Math Kernel Library

MKL_DIRECT_CALL and zgemm3

AndrewC — Thu, 28 Aug 2014 15:17:01 GMT

It seems that MKL_DIRECT_CALL does not apply to zgemm3 and cgemm3, only zgemm and cgemm

It seems slightly annoying that this is not the case as zgemm3 is significantly more numerically efficient for large matrices and is therefore a replacement for zgemm and it would have been helpful for MKL_DIRECT_CALL to switch calls of zgemm3 as well as zgemm for small matrices

you right, this optimization

Gennady_F_Intel — Thu, 28 Aug 2014 17:34:34 GMT

you right, this optimization would be added later into one of the next versions. We will update this record accordingly.

Great! At the moment I do my

AndrewC — Thu, 28 Aug 2014 19:21:37 GMT

Great! At the moment I do my own test of the sizes and switch to zgemm3 for N>128 (say)

To make sure we understand

Murat_G_Intel — Thu, 28 Aug 2014 20:56:49 GMT

To make sure we understand your request correctly, you use zgemm instead of zgemm3m if the matrices are smaller than 128, right? And, you would like MKL_DIRECT_CALL feature to do a similar transformation if the matrices are small enough?

In my existing code, I only

AndrewC — Thu, 28 Aug 2014 21:59:56 GMT

In my existing code, I only call zgemm3 - never zgemm

I want to use MKL_DIRECT_CALL but since MKL_DIRECT_CALL does not support zgemm3, I have added wrapper code that calls zgemm3 for N>=128, and zgemm for N<128

Thank you for the details! I

Murat_G_Intel — Fri, 29 Aug 2014 18:26:04 GMT

Thank you for the details! I got it know. Please let us know if there are other high priority routines that the MKL_DIRECT_CALL feature would help.

Andrew, please check how it

Gennady_F_Intel — Mon, 09 Feb 2015 08:50:12 GMT

Andrew, please check how it works with the latest MKL 11.2 update 2 which has been released the last week.

Yes, direct call to zgemm3

AndrewC — Wed, 11 Feb 2015 01:40:51 GMT

Yes, direct call to zgemm3/cgemm3 works great in the latest update to MKL.

thank you!

Andrew, Thanks for nice words

Gennady_F_Intel — Wed, 11 Feb 2015 09:57:47 GMT

Andrew, Thanks for nice words about Intel(R) MKL. Please don't hesitate report us any issues. regards, Gennady