Distinction sync/Async

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@@ -823,7 +823,10 @@ this model, the faster and more frequently a task receives its
 dependencies, the faster it converges. Moreover, as the JaceP2P-V2
 environment is fault tolerant and tasks save checkpoints on their
 neighbors, it is more efficient to save on near nodes than on far
-ones.
+ones. In the synchronous model, both heterogeneity and locality must
+be taken into account in a balanced way. In the asynchronous model,
+since no synchronizations occurs, the heterogeneity issue is less
+important.
 
 
 %As our problem is on task mapping, only considering the dependency