instances/bley_xl1.pre.mps.gz [      0.00] Reading input file: instances/bley_xl1.pre.mps.gz...
           instances/bley_xl1.pre.mps.gz [      1.69] Fetched 158897 rows, 162156 cols.
           instances/bley_xl1.pre.mps.gz [      1.69] Solving first relaxation...