+# ../../src/smpi/smpirun -np 3 -platform platform.xml -hostfile hostfile ./bcast
+
+Note that by default, the examples use the installed version of
+simgrid. So please install it before playing with the examples, or set
+a LD_LIBRARY_PATH variable pointing to src/.libs
+
+
+
+
+
+Network Model
+=============
+
+SMPI runs with a cluster-specific network model. This model is piece-wise
+linear: each segment is described by a latency correction factor and a
+bandwidth correction factor (both are multiplicative and apply to the values
+given in the platform file).
+
+To compute the values for a specific cluster, we provide the script
+contrib/network_model/calibrate_piecewise.py. This script takes four mandatory
+command line parameters:
+
+1) a SKaMPI data file for a Pingpong_Send_Recv experiment
+2) the number of links between the nodes involved in the SKaMPI measurments
+3) the latency value of the links, as given in the platform file
+4) the bandwidth value of the links, as given in the platform file
+
+It also takes an arbitrary number of optional parameters, each being a segment
+limit on which to compute the correction factors.
+
+The script then outputs the latency and bandwidth factor for each segment that
+best fit the experimental values. You can then apply these factors in the
+network model by modifying the values in src/surf/network.c (after the "SMPI
+callbacks" comment, lines 44 to 77).
+
+