This is the SimGrid project.
This file is a bit outdated, sorry.
There is at least 5 sub-projects in the tree:
- XBT: eXtended Bundle of Tools (low-level toolbox: logging, datatypes).
- SURF: a SimUlation aRtiFact. This is the simulation kernel.
- MSG: originally MetaSimGrid, MSG is a simple distributed application
simulator.
- GRAS: Grid Reality And Simulation (message passing API with two
implementations allowing to compile programs on top of the
simulator or for the real life without code modification)
- AMOK: Advanced Metacomputing Overlay Kit (high level toolbox; Grid
application elements such as distributed database, topology
discovery service, and so on)
More informations are available in the doc/ directory.
In particular, don't forget to read the FAQ in there. It probably contains
the answer to your question ;)