--%>
Assignment Help - homework help

Explain LURCH

LURCH (Menzies et al. 2004) uses random search to explore a state machine’s state space. Because the search is random, it gives no guarantee that the state space has been exhaustively explored, so LURCH cannot be used for verification. However, any errors it finds are real errors, so it can be used for debugging. It can find assertion violations, deadlock, and cycle-based errors (no-progress cycles, and violations of temporal logic properties specified as acceptance cycles); finding cycle-based errors requires a state hash table. LURCH’s input format is concurrent finite-state machines, where transitions may be specified by C code.

In a case study of running model checkers to find seeded errors in a flight guidance system model, NuSMV (a model checker not described in this report) had a mean runtime of 2 hours where LURCH had a mean runtime of 3 minutes, yet LURCH found 40 of the 44 seeded errors that NuSMV found. In other demonstration problems, LURCH found all the errors that SPIN found when SPIN could terminate with the given resources. LURCH is claimed to scale to larger problems, and tends to use a stable amount of resources.

   Related Questions in Programming Languages

  • Q : What is Virtual desktop Virtual desktop

    Virtual desktop: The name employed to explain a user's graphical working area in a window manager. The name arises in the early days of graphical user interfaces whenever it was thought that such would lead to `paperless offices'. This was anticipated

    		•
  • Q : Define Single line comment Single line

    Single line comment: A comment is in the form:     // this line will be avoided by the compiler.

    		•
  • Q : What is an Overriding for breadth

    Overriding for breadth: It is a form of method overriding in which the sub-class version of a technique implements its own behavior within the context of attributes and behavior of the sub-class and then calls the super-class version and hence it can

    		•
  • Q : What is Class body Class body : It is a

    Class body: It is a body of class definition. The body collects the definitions of a class's members that is, methods, fields and nested classes.

    		•
  • Q : What is Stepwise refinement Stepwise

    Stepwise refinement: It is a divide and conquer approach to the programming, in which a complicated problem is recursively divided into smaller, sub-problems and more manageable. This approach to program design is frequently employed with structured p

    		•
  • Q : Data types of LONG To define the data

    To define the data types such as LONG, INT, SHORT, CHAR write a program?

    		•
  • Q : What is no-arg constructor no-arg

    no-arg constructor: It is a constructor which takes no arguments. By default, each and every class without an explicit constructor has a default no-arg constructor with the public access. Its role is entirely to invoke the no-arg constructor of the in

    		•
  • Q : Explain different types of variable iv

    The kind of value that a variable can own is known as data type. When we state a variable we require specifying the type of value it will own with the n

    		•
  • Q : Explain Throw statement Throw statement

    Throw statement: It is a statement employed to throw an exception. For example:     throw new IndexOutOfBoundsException(i+" is too large.");

    		•
  • Q : Define Null reference Null reference :

    Null reference: A value utilized to mean, `no object'. Employed whenever an object reference variable is not referring to the object.

    		•