Changing a few settings for MKL on Ubuntu

[brunodoamaral]

This is my current configuration for MKL on Ubuntu.
I also corrected the BLASLDFLAGS=-DFINTEGER=long line (it should be BLASCFLAGS).

[facebook-github-bot]

Thank you for your pull request and welcome to our community. We require contributors to sign our Contributor License Agreement, and we don't seem to have you on file. In order for us to review and merge your code, please sign up at https://code.facebook.com/cla - and if you have received this in error or have any questions, please drop us a line at [email protected]. Thanks!

If you are contributing on behalf of someone else (eg your employer): the individual CLA is not sufficient - use https://developers.facebook.com/opensource/cla?type=company instead. Contact [email protected] if you have any questions.

[facebook-github-bot]

Thank you for signing our Contributor License Agreement. We can now accept your code for this (and any) Facebook open source project. Thanks!

[mdouze]

Hi brunodoamaral,

This looks like a reasonable commit. Can you confirm that by setting these flags (and uncommenting them), Faiss works with MKL?

Thanks

[brunodoamaral]

Hi @mdouze, with above settings I was able to compile the lib.

However, I'm still not able to run it. But it seems to be a problem with my MKL instalation:

ImportError: /opt/intel/compilers_and_libraries_2017.2.174/linux/mkl/lib/intel64_lin/libmkl_gnu_thread.so: undefined symbol: mkl_sparse_d_csr__g_n_syrk_notr_row_struct_i8

Running the ldd command on the problematic .so results the same output:

user@machine ~/git/faiss $ ldd -r $MKLROOT/lib/intel64/libmkl_gnu_thread.so | grep mkl_sparse_d_csr__g_n_syrk_notr_row_struct_i8
undefined symbol: mkl_sparse_d_csr__g_n_syrk_notr_row_struct_i8	(/opt/intel/compilers_and_libraries/linux/mkl/lib/intel64/libmkl_gnu_thread.so)

I already tried to set LD_LIBRARY_PATH and running source $MKLROOT/bin/mklvars.sh intel64 ilp64 but have no success.

I'll report here if I have success using faiss.

[mdouze]

Hi,

It works for me with IntelComposerXE 2017.0.098. I still need to set the LD_LIBRARY_PATH. The makefile.inc flags are:

BLASLDFLAGS=-Wl,--no-as-needed -L$(MKLROOT)/lib/intel64   -lmkl_intel_ilp64 \
 -lmkl_core -lmkl_gnu_thread -ldl -lpthread
BLASCFLAGS=-DFINTEGER=long

Then

LD_LIBRARY_PATH=/tmp/mkl/lib/intel64 tests/demo_ivfpq_indexing
LD_LIBRARY_PATH=/tmp/mkl/lib/intel64 python -c "import _swigfaiss"

both work.

[brunodoamaral]

Thanks @mdouze, I was able to compile using MLK 2017.0.098.
I just update the documentation to reflect these changes.

[mdouze]

OK for merge