:scale: 80%
:align: center
-For the sake of performance, actors can be executed in parallel using several system threads which execute all user threads in
+For the sake of performance, actors can be executed in parallel using several system threads which execute all actors in
turn. But in our experience, this rarely leads to any performance improvement because most applications simulated on top of
SimGrid are fine-grained: it's often not worth simulating actors in parallel because the amount of work of each actor is too
small. This is because the users tend to abstract away any large computations to efficiently simulate the control flow of their
For example, the existing SMPI implementation cannot be used in parallel yet.
.. image:: img/design-scheduling-parallel.svg
+ :scale: 80%
:align: center
Parsimonious model versatility
