RunMode

RunMode

Specifying Run Modes

BPmc is activated by specifying the runmode paramater in the run configuration, under VM parameters, as follows:

-DrunMode=Det

• Description: “Normal” / standard / deterministic run.
• Use: when you want the program to “do something”.
• Nondeterminism specification: Ignored. All priorities are considered distinct.
• Event Selection: Always the first requested event that is not blocked.
• Backtracking: none.
• Stops: When all b-threads end, or when there are no enabled events.

-DrunMode=Random

• Description: One possible run out of many.
• Use: Demonstration or manual exploration of different possible runs.
• Non-determinism specification: Allowed.
• Event selection: Random among all non-deterministic choices.
• Backtracking: none.
• Stops: When all b-threads end, or when there are no enabled events.
• Additional related parameters: -DrandomSeed= nnnn.

-DrunMode=Iter

• Description: An iterative run – explore all possible executions.
• Use: to assess traces and results of all possible runs resulting from non-deterministic choices.
• Non-determinism specification: Allowed.
• Event selection: Systematically makes all possible combinations of event selections - in different runs.
• Backtracking: When a run ends , it is restarted , and a new combination of event selections is used - from the beginning - not at the next higher nondeterminstic choice.
• Stops: When the last run of all possible runs ends (all possible combinations of event selections exhausted).

-DrunMode=MCSafety

• Description: A model-checking run. Explore all possible executions paths – looking to validate safety properties.
• Use: Model checking: explore safety properties (including deadlocks), liveness properties (with fairness assumptions), discover desired paths, etc.
• Nondeterminism specification: Allowed (actually required by definition).
• Event selection: Systematically makes all possible combinations of event selections

Backtracking: systematic as part of exploring the state-graph - as described in section on nondetermism Stops: When counterexample is found, or when verification of all transitions / states is complete. Additional related parameters: -Dsearch=BFS/DFS, -Drecursive=true/false

-DrunMode=MCLiveness Description: A model-checking run– explore all execution paths looking to validate liveness properties subject to fairness assumptions. Use: Model checking: explore safety properties (including deadlocks), liveness properties (with fairness assumptions), discover desired paths, etc. Non-determinism specification: Allowed (actually required by definition) of MC. Event selection: Systematically makes all possible combinations of event selections Backtracking/rerun: extensive backtracking as part of exploring the state-graph Stops: When counterexample is found, or when verification of all transitions / states is complete. Additional related parameters: Conditional, strong and weak fairness assumptions provided as sets of events� -DrunMode=MCDet Description: A deterministic run, with model-checking instrumentation. No non-determinism. Always pick 1st event -DrunMode=Learning/Training (In development)