__AVX__ problem

[Victor Eijkhout]

If I read the log and the cmake log correctly, an __AVX__ flag is missing. But I'm supplying a whole slew of AVX flags....

Please see the attached.

Victor.

[Daniel Arndt]

Victor,

the problem that is responsible for the failing build process is a different one:

Performing C++ SOURCE FILE Test DEAL_II_HAVE_USABLE_FLAGS_DEBUG failed with the following output:
Change Dir: /tmp/dealii-build/CMakeFiles/CMakeTmp

Run Build Command:"/usr/bin/gmake" "cmTC_9c70f/fast"
/usr/bin/gmake -f CMakeFiles/cmTC_9c70f.dir/build.make CMakeFiles/cmTC_9c70f.dir/build
gmake[1]: Entering directory `/tmp/dealii-build/CMakeFiles/CMakeTmp'
Building CXX object CMakeFiles/cmTC_9c70f.dir/src.cxx.o
/opt/intel/compilers_and_libraries_2018.2.199/linux/bin/intel64/icpc    -DDEAL_II_HAVE_USABLE_FLAGS_DEBUG -fpic -ansi -w2 -diag-disable=remark -wd21 -wd68 -wd135 -wd175 -wd177 -wd191 -wd193 -wd279 -wd327 -wd383 -wd981 -wd1418 -wd1478 -wd1572 -wd2259 -wd2536 -wd3415 -wd15531 -wd111 -wd128 -wd185 -wd186 -wd280 -qopenmp-simd -std=c++14 -O0 -g -gdwarf-2 -grecord-gcc-switches -std=c++14 -g -xCORE-AVX2 -axMIC-AVX512,CORE-AVX512 -I/opt/intel/compilers_and_libraries_2018.2.199/linux/tbb/include -O0   -o CMakeFiles/cmTC_9c70f.dir/src.cxx.o -c /tmp/dealii-build/CMakeFiles/CMakeTmp/src.cxx
gmake[1]: *** No rule to make target `/home1/apps/intel18/superlu_seq/5.2.1/lib/libsuperlu.a', needed by `cmTC_9c70f'.  Stop.
gmake[1]: Leaving directory `/tmp/dealii-build/CMakeFiles/CMakeTmp'
gmake: *** [cmTC_9c70f/fast] Error 2

Source file was:
int main(){ return 0; }

There seems to be some problems with your superlu build.

Your AVX problem appears to be related to https://github.com/dealii/dealii/pull/4440

Can you try to compile with -march=native -xhost or  -xavx?

What is the output of

$ icc -dM -E -x c /dev/null

for these compiler flags?

Best,

Daniel

[Martin Kronbichler]

Dear Victor,

The file CMakeError.txt indicates that no flags are present at the stage the respective test is ran:

/opt/intel/compilers_and_libraries_2018.2.199/linux/bin/intel64/icpc    -DDEAL_II_HAVE_AVX   -o CMakeFiles/cmTC_ffc3b.dir/src.cxx.o -c /tmp/dealii-build/CMakeFiles/CMakeTmp/src.cxx

Note that no additional flags are given. This is how it looks on my machine (with gcc):

/opt/openmpi/1.8.8/gcc/bin/mpicxx    -DDEAL_II_HAVE_AVX -march=native   -o CMakeFiles/cmTC_7125b.dir/src.cxx.o -c /home/kronbichler/sw/build_deal/CMakeFiles/CMakeTmp/src.cxx

Note that it adds '-march=native'. I see in your script that you add the flags "-std=c++14 -g -xCORE-AVX2 -axMIC-AVX512,CORE-AVX512 -I/opt/intel/compilers_and_libraries_2018.2.199/linux/tbb/include -O2" individually to both DEAL_II_CXX_FLAGS_DEBUG and DEAL_II_CXX_FLAGS_RELEASE. What happens is that our configuration system only adds the generic flags to the respective tests, i.e., you should put the generic flags to CMAKE_CXX_FLAGS. You can additionally specify what you want to have for the release or debug flags, but the machine-specific flags are, at least as far as I remember the build system, only passed on from the generic compiler flags. Here is an example from what I set to get the above line:

cmake ...     -D CMAKE_CXX_FLAGS="-march=native"    -D CMAKE_C_FLAGS="-march=native"  -D DEAL_II_CXX_FLAGS_RELEASE="-O3"  ...

I hope this helps.

Best,
Martin

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