[CP2K-user] libxsmm target

[h...@gmail.com]

Hello,

thank you for posting into CP2K forum!  Indeed, INTRINSICS=1 overcomes 
build issues on systems with outdated Binutils. CP2K toolchain installs GCC 
from scratch but omits GNU Binutils. In case of CP2K's usage, there is no 
harm from INTRINSICS=1 (affected functionality is not used in CP2K). 
Further, the next release of LIBXSMM reimplemented matrix-element-wise 
functionality which was mostly affected by the INTRINSIC setting. In turn,  
matrix-element-wise functionality is mainly present in LIBXSMM's 
Deeplearning Domain (CP2K only uses the SMM domain). I will likely remove 
this warning in an upcoming release of LIBXSMM.

Best wishes,
H.

wiec... at gmail.com schrieb am Samstag, 26. Dezember 2020 um 23:57:04 
UTC+1:

> Hello,
> The tools/toolchain/scripts/install_libxsmm.sh compiles the library with 
> INTRINSICS=1 without further specifying the target processor (cp2k 8.0 
> dev). The result is the library optimized for sse4.2. The make.log says:
>
>
> --------------------------------------------------------------------------------
>
> INTRINSICS=1 without setting AVX can reduce performance of certain code 
> paths.
>
> If adjusting INTRINSICS was necessary, reconsider an updated tool chain.
>
>
> --------------------------------------------------------------------------------
> Is there a particular reason for such setting? What about just AVX=2, or 
> even TARGET="-march=native mtune=native"?
> Thank you for cp2k!!
> Best,
> g
>
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