The configuration file config.hh

The configuration file allows the user to change many compile time characteristics of the simulation kernel. (For detailed information on the options available, see config.hh itself.) These options fall under several broad categories:

• Schedulers
  • LTSFSscheduler - All of the simulation objects on an LP share a single input queue, and the simulation object with the lowest timestamped event executes next.
• Fossil Managers
  • GVTManager - PGVT algorithm implemented without message acknowledgment.
  • MatternGVTManager - Mattern's GVT algorithm implemented without message acknowledgement.
  • OfcManager - Implements optimistic fossil collection. Uses statistical methods to perform fossil collection.
• State Managers
  • StateManager - The traditional TimeWarp state management strategy - save state after each simulation cycle.
  • InfreqStateManager - Allows objects to save state periodically - every other simulation cycle, for instance.
  • LinStateManager - Implements Lin's adaptive state state savings strategy.
  • NashStateManager - Implements Palaniswamy's adaptive state state savings strategy.
  • CostFuncStateManager - Implements Fleischman's adaptive state state savings strategy.
• Memory Managers
  • GlobalMemoryManager - Implements the CustomMalloc strategy for dynamic memory allocation.
  • BuddyMemoryManager - Implements the Buddy Allocation paradigm for dynamic memory allocation.
  • SegregatedMemAlloc - Implements the First-Fit strategy using segregated lists.
  • BrentMemAlloc - Implements an efficient First-Fit strategy.
• TimeWarp optimizations
  • Cancelation strategies - The choices are aggressive cancelation, lazy cancelation, and adaptive switching between the two (Dynamic Cancellation).
  • One antimessage per rollback - only one antimessage is sent out upon rollback. The lowest timestamp antimessage is sent out and the other antimessages are suppressed. At the receipient's end, upon receiving an antimessage, all messages with timestamps greater than that of the antimessages are deleted. This greatly reduces the total number of messages that are generated in the system and improves performance.