[CP2K:4688] ld: cannot find -lsmm_dnn

[Iain Bethune]

Hi,

Libsmm is a library of optimised small dgemm kernels which can give the code quite a speedup, especially for calculations dominated by DBCSR, where the block sizes are small (light atoms / small basis sets).  You can build it for your machine by following the instructions in cp2k/tools/build_libsmm.  Otherwise you can just remove it from the LIBS variable.  Note that if you link the library you should also add -D__HAS_smm_dnn (or remove it if not) to DFLAGS.  Since you've already got to the link stage, if you want to build without the library you'll need to edit the DFLAGS and do a clean build.

Cheers

- Iain

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Iain Bethune
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On 11 Oct 2013, at 00:30, Calvin47 wrote:

> I am trying to compile with gfortran on x86_64 popt but in the last second it colapse with this message;
> ld: cannot find -lsmm_dnn
> 
> This line on ARCH seems to cause the error1
> LIBS     = -lsmm_dnn -lderiv 
> 
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