Morsel-Driven-Parallel-Execution.md

@@ -8,3 +8,16 @@ In iterative execution, a chunk of input is processed in one operation and then
 
 ### Challenges in Cross-Device Iterative Processing
 
+1. Optimal chunk size
+    * chunk for individual devices
+    * chunk for individual operations
+
+2. pushing data vs pulling data
+3. optimal split vs merge operations
+4. Preference for operation placement
+5. Data partitioning with functional placement
+     * data vs functional parallelism
+6. Type of linearization
+     * BFS
+     * Topological sorting
+     * DFS ( in-addition with data parallel execution)