Here is the hierarchical view of all SimGrid modules. You can reduce the amount of detail with the 'detail level' setting, on the right.

[detail level 1234]

▼SimDag: Legacy handling of DAG algorithms	Programming environment for DAG applications
Hosts	Host management
Links	Link management
Tasks	Task management
Tasks dependencies	Functions to specify the dependencies between tasks
Storages	Storage management
Simulation	Functions to create the environment and launch the simulation
▼XBT: SimGrid core toolbox	The core toolbox of SimGrid, containing useful datatypes and friends
▼Grounding features	Grounding features are the basement of SimGrid
Malloc and friends	Malloc and associated functions, killing the program on error (with Exception support (C++))
String related functions	String manipulation functions
Exception support (C++)
Exception support (C)	Exceptions support (C)
▼Logging support	A generic logging facility in the spirit of log4j (grounding feature)
Existing log categories	(automatically extracted)
Assert macro familly	Those are the SimGrid version of the good ol' assert macro
▼Configuration support	Changing the configuration of SimGrid components (grounding feature)
User interface: changing values	This is the only interface you should use unless you want to let your own code become configurable with this
Configuration type declaration and memory management
Registering stuff	This how to add new variables to an existing configuration set
Getting the stored values	This is how to retrieve the values stored in the configuration set
▼Mallocators	The mallocator system
Mallocator constructor and destructor
Mallocator object handling
Unit testing support	Unit testing implementation (see Adding unit tests)
▼Usual data structures	Here are the basic data containers that every C programmer rewrites one day
▼Dynar: generic dynamic array	DynArr are dynamically sized vector which may contain any type of variables
Dynar constructor and destructor
Dynar as a regular array
Dynar miscellaneous functions
Perl-like use of dynars
Direct manipulation to the dynars content	Those functions do not retrieve the content, but only their address
Speed optimized access to dynars of scalars	While the other functions use a memcpy to retrieve the content into the user provided area, those ones use a regular affectation
Cursors on dynar	Cursors are used to iterate over the structure
▼Dict: generic dictionnary	The dictionary data structure (comparable to hash tables)
Dict constructor and destructor
Dictionaries basic usage	Careful, those functions assume that the key is null-terminated
Dictionaries with non-nul terminated keys	Those functions work even with non-null terminated keys
Cursors on dictionaries	Don't get impressed, there is a lot of functions here, but traversing a dictionary is immediate with the xbt_dict_foreach macro.
▼Miscellaneous	Here are several general purposes library components designed specially for you, you lucky one
General purpose graph library	A graph data type with several interesting algorithms
Parallel map	Parallel map
Simulated Synchronization	XBT synchronization tools
Thread stuff	Thread portability layer
Portable context implementation	Contexts are a higher level system than `setjump/longjmp` for non-preemptible threads
Replay
▼TRACING	Gather data about your simulation for later analysis
Tracing categories	Functions to declare tracing categories
Tracing marks	Functions to declare and create tracing marks
Tracing user variables	Functions to declare and define user variables associated to resources
Routing: Determining the communication paths	Organize the platform to determine the links used by each communication
▼SURF	Internal kernel of all the simulators used in SimGrid, and associated models
Simulation Models	Functions to declare the kind of models that you want to use
Simulation	Functions for creating the environment and launching the simulation
Create a new API	How to build a new API on top of SURF
SURF C bindings	Describes the c bindings of SURF
SURF Interface	Describes the general interface for all components (Cpu, Network, Storage, Host, VM)
SURF Cpu Interface	Describes the general Cpu interface for all Cpu implementations
SURF Network Interface	Describes the general Network interface for all Network implementations
SURF Storage Interface	Describes the general interface for all Storage implementations
SURF Host Interface	Describes the general interface for all Host implementations
SURF VM Interface	Describes the general interface for all VM implementations
SURF Linear MaxMin	Describes how the linear MaxMin system work
SURF callbacks	Describes how to use the SURF callbacks
Energy Plugin	Describes how to use the energy plugin
MSG examples	Find the MSG example fitting your needs from the extensive set provided in the archive
SURF_plugin_load	This plugin makes it very simple for users to obtain the current load for each host
Plugin_load	This plugin makes it very simple for users to obtain the current load for each host
SURF_plugin_energy	This is the link energy plugin, accounting for the dissipated energy in the simulated platform