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architecture.en.md

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+# Gem-graph Architecture
+
+- The [server](https://gitlab.os-k.eu/gem-graph-team/gem-graph-server) is the part whose execution is punctuated by the model calculation. It includes:
+
+   - the cli interface (command line interface) which manages the server on the machine where it is executed, or remotely via the client (provide translations, vocabulary management)
+
+   - the [scheduler](server/scheduler.md) which coordinates the calculation of the model by initiating and terminating the supervisor and the calculation threads
+
+   - the [supervisor](server/supervisor.md) which:
+
+      - maintains the history and performs measurements
+
+      - performs an integrity test and returns its result to the scheduler
+         (to detect chaotic states, infinite loops, unbalanced distributions between computation threads,...)
+      
+   - the [calculation threads](server/worker_thread.md)
+
+- The [client](https://gitlab.os-k.eu/gem-graph-team/gem-graph-client) is the part whose execution is timed by the user:
+
+     - initiation / termination / OS interface
+
+     - the associated inputs / outputs / error checks
+
+     - the user control of the computation performed by the server
+
+        - server interface > user (what is the state of the model ? how does the automaton work ?)
+        
+        - user > server interface (stop, slow / speed, undo / redo, modify the nb of threads or the algorithm...)
+
+     - view management (conformity to a view_type)
+
+     - the editions
+
+        - states 
+
+        - transition rules
+
+        - rule trees
+
+     - interpretation of model state measures and model history
+
+     - translations, vocabulary management
+
+     - aids/facilities/presentation (texts, views, links) to :
+
+        - theoretical background, bibliography
+
+        - principles / justifications / limits of the model
+
+        - license, rights, authors, practical information
+
+        - presentation tools
+
+---
+
+The number of calculations that can be performed in parallel depends on
+
+ - the ratio between the size of the local space and the global space
+
+ - the average running time of the rules
+ (if we neglect the initiation and termination operations of the calculation threads and the 
+ and the communication operations of the main loop with its environment)
+
+Note: the command line interface must also intercept user requests and delegate them to dedicated threads or processes