pOSKI library installation steps

1. Install gcc and gfortran;
2. Download the poski library, select the full version, address: BeBOP parallel Optimized Sparse Kernel Interface (pOSKI)
3. Unzip the poski source code and get the poski-v1.0.0 folder;
4. Modify the poski-v1.0.0/oski/oski-1.0.1h/configure file, line 21535, and change the -march value to native. It depends on the machine CPU type. You need to modify the value of the corresponding type.
   
5. Create a new build directory under the poski-v1.0.0 directory, then cd into the build directory
6. Execute the command in the build directory

   sudo ../INSTALL.sh --with-oski=yes

7. Set environment variables

   export OSKIDIR=/usr/local/poski/build_oski
   export POSKIDIR=/usr/local/poski
   export POSKI_MESSAGE_LEVEL=0