HCCL (Habana Collective Communication Library) supports inter-node communication based on OFI libfabric.
HCCL OFI wrapper introduced to act as a thin layer connecting between HCCL and libfabric APIs.

1.0.

To use HCCL over OFI libfabric:

1. libfabric should be downloaded and installed.
   
2. HCCL OFI Wrapper should be downloaded and built.
   

libfabric should be downloaded and installed in order to use it.
Please follow the instructions below:

1. Define required version to be installed

   export REQUIRED_VERSION=1.20.0
   

2. Download libfabric tarball from: https://github.com/ofiwg/libfabric/releases

   wget  https://github.com/ofiwg/libfabric/releases/download/v$REQUIRED_VERSION/libfabric-$REQUIRED_VERSION.tar.bz2 -P /tmp/libfabric
   

3. Store temporary download directory in stack

   pushd /tmp/libfabric
   

4. Open the file

   tar -xf libfabric-$REQUIRED_VERSION.tar.bz2
   

5. Define libfabric root location

   export LIBFABRIC_ROOT=<libFabric library location>
   

6. Create folder for libfabric

   mkdir -p ${LIBFABRIC_ROOT}
   

7. Change permissions for libfabric folder

   chmod 777 ${LIBFABRIC_ROOT}
   

8. Change directory to libfabric folder created after opening tar file

   cd libfabric-$REQUIRED_VERSION/
   

9. Configure libfabric

   ./configure --prefix=$LIBFABRIC_ROOT --with-synapseai=/usr
   

10. Build and install libfabric

    make -j 32 && make install
    

11. Remove temporary download directory from stack

    popd
    

12. Delete temporary download directory

    rm -rf /tmp/libfabric
    

13. Include LIBFABRIC_ROOT in LD_LIBRARY_PATH:

    export LD_LIBRARY_PATH=$LIBFABRIC_ROOT/lib:$LD_LIBRARY_PATH
    

    Installation can be verified by running: fi_info --version.
    For more information please see: https://github.com/ofiwg/libfabric

To use libfabric library, HCCL OFI wrapper should be built.
Please follow the instructions below:

1. Clone wrapper from https://github.com/HabanaAI/hccl_ofi_wrapper

   git clone https://github.com/HabanaAI/hccl_ofi_wrapper.git
   

2. Define LIBFABRIC_ROOT

   export LIBFABRIC_ROOT=/tmp/libfabric-1.20.0
   

3. Change directory to hccl_ofi_wrapper

   cd hccl_ofi_wrapper
   

4. Build wrapper

   make
   

5. Copy wrapper to /usr/lib/habanalabs/

   cp libhccl_ofi_wrapper.so /usr/lib/habanalabs/libhccl_ofi_wrapper.so
   

6. Run ldconfig utility

   ldconfig
   

7. Include libhccl_ofi_wrapper.so location in LD_LIBRARY_PATH:

   export LD_LIBRARY_PATH=$LD_LIBRARY_PATH:/usr/lib/habanalabs/