One neat testing strategy is to artificially lower counter used to tier up. Instead of using 1000 for DFG and 100000 for FTL, use something like 10 for DFG and

One neat testing strategy is to artificially lower counter used to tier up. Instead of using 1000 for DFG and 100000 for FTL, use something like 10 for DFG and 100 for FTL. This will cause lots of opt/deopt stress and can discover correctness bugs which may hide in more normal executions.