Distributed-Model.md

@@ -108,7 +108,10 @@ Comparison of the update phase, without considering task overlapping. We will me
 | Strategy 2 | 4 |210 - 230 ms |
 | Strategy 3 | 4 | |
 
-# Ring communications
+# Multi-reduce + broadcast communications
+
+Some traces, with 4 ranks, 1 rank/socket, B = 4, T=1024
+
 ![RC_legend](uploads/74660146f17bc0d52b76d2d48dd95455/RC_legend.png)
 
 ![RC_implementation](uploads/12ae0ed35cb016331ce4da4a3f7d9aac/RC_implementation.png)
@@ -119,4 +122,13 @@ Comparison of the update phase, without considering task overlapping. We will me
 
 ![mpi_comms](uploads/cc578008512fec4a6c810fd4936d588f/mpi_comms.png)
 
-![mpi_comms.code_legend](uploads/b2a0c1e1c7f98529751cbe14084768aa/mpi_comms.code_legend.png)
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+![mpi_comms.code_legend](uploads/b2a0c1e1c7f98529751cbe14084768aa/mpi_comms.code_legend.png)
+
+
+Communication cost with number of ranks : 
+| Number of ranks | Communication time from last to first | Communication time from first to last |
+| ------ | ------ | ------ |
+ |    2    |   100 ms     | 180 ms |
+|    4    |    70 ms   | 100 ms |
+| 8 | 150 ms | 300 ms |
+| 16 | 175 ms | 300 ms |
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