Upgrade extract.pl.

[loba.git] / NOTES

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-Process parameters:
+Process parameters
+==================

 
 

-    initial_load [neighbors...]
+The process parameters are: initial_load [neighbors...]

 
 

-Communications:
-     - two channels per host: control and data
+Communications
+==============
+
+There are two receiving channels per host: control for information
+messages, and data for load transfers.

 
 Process model
 
 Process model

+=============
+
+Each process is made of 3 threads: a receiver thread, a computing
+thread, and a load-balancer thread.
+
+* Receiver thread
+  ---------------
+
+    Loop
+    | wait for a message to come, either on data channel, or on ctrl channel
+    | push received message in a buffer of received messages
+    | -> ctrl messages on the one side
+    | -> data messages on the other side
+    +-
+
+   The loop terminates when a "finalize" message is received on each
+   channel.
+
+* Computing thread
+  ----------------
+
+    Loop
+    | if we received some real load, get it (data messages)
+    | if there is some real load to send, send it
+    | if we own some load, simulate some computing on it
+    +-
+    send CLOSE on data for all neighbors
+    wait for CLOSE on data from all neighbors
+
+  The loop terminates when process::still_running() returns false.
+  (read the source for full details...)
+
+* Load-balancing thread
+  ---------------------

 
 

-     while (there is something to do) {
-        compute some task;
-        get received tasks;
-        compute load balancing;
-        send tasks to neighbors;
-     }
+    Loop
+    | call load-balancing algorithm
+    | send ctrl messages
+    | receive ctrl messages
+    +-
+    send CLOSE on ctrl for all neighbors
+    wait for CLOSE on ctrl from all neighbors

 
 

-    * Open Questions :
-     - definition of load on heterogeneous hosts?
-     - how to detect convergence?
-       : No need to detect convergence.  Computation stops when there
-         nothing more to do.
+  The loop terminates when process::still_running() returns false.
+  (read the source for full details...)

 
 

-     - how to manage link failures?
+Open questions
+==============
+ * definition of load on heterogeneous hosts?
+ * how to detect convergence?
+   : No need to detect convergence.  Computation stops when there
+     nothing more to do.
+ * how to manage link failures?