Invoking Level 1 and 2 Optimizations on MPE/iX There are two optimization levels on MPE/iX. You invoke the optimizer by passing an option to the compiler. Level 1 Optimization CCXL sourcefile;INFO="+O1" Level 2 Optimization For level 2 optimization, use the command: CCXL sourcefile;INFO="-O" or: CCXL sourcefile;INFO="+O2"