new version of the masterworkers tuto, with s4u and sphinx

diff --git a/doc/doxygen/examples.doc b/doc/doxygen/examples.doc
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--- a/doc/doxygen/examples.doc
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-/*! @page examples SimGrid Examples
-
-@tableofcontents
-
-SimGrid comes with many examples provided in the examples/ directory.
-Those examples are described in section @ref msg_examples. Those
-examples are commented and should be easy to understand. for a first
-step into SimGrid we also provide some more detailed examples in the
-sections below. 
-
-@htmlonly
-You should also check our online <a href="http://simgrid.gforge.inria.fr/documentation.html"> tutorial section</a> that contains a generic tutorial about using SimGrid. 
-@endhtmlonly
-
-@section using_msg Using MSG
-
-@htmlonly
-You should also check our online <a href="http://simgrid.gforge.inria.fr/documentation.html"> tutorial section</a> that contains a dedicated tutorial. 
-@endhtmlonly
-
-Here are some examples on how to use MSG, the most used API.
-
-MSG comes with an extensive set of examples. It is sometimes difficult
-to find the one you need. This list aims at helping you finding the
-example from which you can learn what you want to.
-
-@subsection MSG_ex_basics Basic examples and features
-
-@subsubsection MSG_ex_master_worker Basic Master/Workers
-
-Simulation of a master-worker application using a realistic platform and an external description of the deployment.
-
-@paragraph MSG_ex_mw_TOC Table of contents:
-
-   - @ref MSG_ext_mw_preliminary
-   - @ref MSG_ext_mw_master
-   - @ref MSG_ext_mw_worker
-   - @ref MSG_ext_mw_core
-     - @ref MSG_ext_mw_platform
-     - @ref MSG_ext_mw_application
-
-<hr>
-
-@dontinclude msg/app-masterworker/app-masterworker.c
-
-@paragraph MSG_ext_mw_preliminary Preliminary declarations
-
-@skip include
-@until example");
-@skipline Master expects
-
-@paragraph MSG_ext_mw_master Master code
-
-This function has to be assigned to a #msg_process_t that will behave as the master. It should not be called directly 
-but either given as a parameter to #MSG_process_create() or registered as a public function through 
-#MSG_function_register() and then automatically assigned to a process through #MSG_launch_application().
-
-C style arguments (argc/argv) are interpreted as:
-   - the number of tasks to distribute
-   - the computational size of each task
-   - the communication size of each task
-   - the number of workers managed by the master.
-
-Tasks are evenly sent in a round-robin style.
-
-@until return 0;
-@until }
-@skipline Worker expects
-
-@paragraph MSG_ext_mw_worker Worker code
-
-This function has to be assigned to a #msg_process_t that has to behave as a worker. Just like the master function 
-(described in @ref MSG_ext_mw_master), it should not be called directly.
-
-C style arguments (argc/argv) are interpreted as:
-   - a unique id used to build the mailbox name of the worker
-
-This function keeps waiting for tasks and executes them as it receives them. When a special task named 'finalize' is
-received from the master, the process ends its execution.
-
-@until return 0;
-@until }
-
-@paragraph MSG_ext_mw_core Main function
-
-This function is the core of the simulation and is divided only into 3 parts:
-   -# Simulation settings : #MSG_create_environment() creates a realistic
-      environment
-   -# Application deployment : create the processes on the right locations with
-      #MSG_launch_application()
-   -# The simulation is run with #MSG_main()
-
-Its arguments are:
-   - <i>platform_file</i>: the name of a file containing an valid platform description.
-   - <i>deployment_file</i>: the name of a file containing a valid application description
-@line main
-@until OK;
-@until }
-
-@paragraph MSG_ext_mw_platform Example of a platform file
-
-The following platform description can be found in @c examples/msg/platforms/small_platform.xml
-@include platforms/small_platform.xml
-
-@paragraph MSG_ext_mw_application Example of a deployment file
-
-The following application description can be found in @c examples/msg/app-masterworker/app-masterworker_d.xml:
-
-@include msg/app-masterworker/app-masterworker_d.xml
-
-*/
-
-

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diff --git a/docs/source/usecase_algorithms.rst b/docs/source/usecase_algorithms.rst
new file mode 100644 (file)
index 0000000..a66d8b8
--- /dev/null
+++ b/docs/source/usecase_algorithms.rst
@@ -0,0 +1,192 @@
+.. _usecase_simalgo:
+
+Simulating Algorithms
+=====================
+
+SimGrid was conceived as a tool to study distributed algorithms. Its
+modern S4U interface makes it easy to assess Cloud, P2P, HPC, IoT and
+similar settings.
+
+A typical SimGrid simulation is composed of several **Actors**
+|api_s4u_Actor|_ , that execute user-provided functions. The actors
+have to explicitly use the S4U inteface to express their computation,
+communication, disk usage and other **Activities** |api_s4u_Activity|_
+, so that they get reflected within the simulator. These activities
+take place on **Resources** (CPUs, links, disks). SimGrid predicts the
+time taken by each activity and orchestrates accordingly the actors
+waiting for the completion of these activities.
+
+.. |api_s4u_Actor| image:: /images/extlink.png
+   :align: middle
+   :width: 12
+.. _api_s4u_Actor: api/classsimgrid_1_1s4u_1_1Actor.html#class-documentation
+
+.. |api_s4u_Activity| image:: /images/extlink.png
+   :align: middle
+   :width: 12
+.. _api_s4u_Activity: api/classsimgrid_1_1s4u_1_1Activity.html#class-documentation
+
+
+Each actor executes a user-provided function on a simulated **Host**
+|api_s4u_Host|_ with which it can interact. Communications are not
+directly sent to actors, but posted onto **Mailboxes**
+|api_s4u_Mailbox|_ that serve as rendez-vous points between
+communicating processes. 
+
+.. |api_s4u_Host| image:: /images/extlink.png
+   :align: middle
+   :width: 12
+.. _api_s4u_Host: api/classsimgrid_1_1s4u_1_1Host.html#class-documentation
+
+.. |api_s4u_Mailbox| image:: /images/extlink.png
+   :align: middle
+   :width: 12
+.. _api_s4u_Mailbox: api/classsimgrid_1_1s4u_1_1Mailbox.html#class-documentation
+
+
+The Master/Workers Example
+--------------------------
+
+This section introduces a first example of SimGrid simulation. This
+simple application is composed of two kind of actors: the **master**
+is in charge of distributing some computational tasks to a set of
+**workers** that execute them. 
+
+.. image:: /images/tuto-masterworkers-intro.svg
+   :align: center
+
+We first present a round-robin version of this application, where the
+master dispatches the tasks to the workers, one after the other, until
+all tasks are dispatched. Later in this tutorial, you will be given
+the opportunity to improve this scheme.
+
+The Actors
+..........
+
+Let's start with the code of the worker. It is represented by the
+*master* function below. This simple function takes 4 parameters,
+given as a vector of strings:
+
+   - the number of workers managed by the master.
+   - the number of tasks to dispatch
+   - the computational size (in flops to compute) of each task 
+   - the communication size (in bytes to exchange) of each task
+
+Then, the tasks are sent one after the other, each on a mailbox named
+"worker-XXX" where XXX is the number of an existing worker. On the
+other side, a given worker (which code is given below) wait for
+incomming tasks on its own mailbox. Notice how this mailbox mechanism
+allow the actors to find each other without having all information:
+the master don't have to know the actors nor even where they are, it
+simply pushes the messages on mailbox which name is predetermined. 
+
+At the end, once all tasks are dispatched, the master dispatches
+another task per worker, but this time with a negative amount of flops
+to compute. Indeed, this application decided by convention, that the
+workers should stop when encountering such a negative compute_size.
+
+At the end of the day, the only SimGrid specific functions used in
+this example are :func:`simgrid::s4u::Mailbox::by_name` and
+:func:`simgrid::s4u::Mailbox::put`. Also, XBT_INFO() is used as a
+replacement to printf() or to cout to ensure that the messages are
+nicely loggued along with the simulated time and actor name.
+ 
+     
+.. literalinclude:: ../../examples/s4u/app-masterworkers/s4u-app-masterworkers-fun.cpp
+   :language: c++
+   :start-after: master-begin
+   :end-before: master-end
+
+Here comes the code of the worker actors. This function expects only one
+parameter from its vector of strings: its identifier so that it knows
+on which mailbox its incomming tasks will arrive. Its code is very
+simple: as long as it gets valid computation requests (whose
+compute_amount is positive), it compute this task and waits for the
+next one.      
+
+.. literalinclude:: ../../examples/s4u/app-masterworkers/s4u-app-masterworkers-fun.cpp
+   :language: c++
+   :start-after: worker-begin
+   :end-before: worker-end
+
+Starting the Simulation
+.......................
+               
+And this is it. In only a few lines, we defined the algorithm of our
+master/workers examples. Well, this is true, but an algorithm alone is
+not enough to define a simulation.
+
+First, SimGrid is a library, not a program. So you need to define your
+own `main()` function, as follows. This function is in charge of
+creating a SimGrid simulation engine (on line 3), register the actor
+functions to the engine (on lines 7 and 8), load the virtual platform
+from its description file (on line 11), map actors onto that platform
+(on line 12) and run the simulation until its completion on line 15.
+
+.. literalinclude:: ../../examples/s4u/app-masterworkers/s4u-app-masterworkers-fun.cpp
+   :language: c++
+   :start-after: main-begin
+   :end-before: main-end
+   :linenos:
+
+After that, the missing pieces are the platform and deployment
+files.
+
+Platform File
+.............
+
+Platform files define the virtual platform on which the provided
+application will take place. In contains one or several **Network
+Zone** |api_s4u_NetZone|_ that contain both **Host-** |api_s4u_Host|_
+and **Link-** |api_s4u_Link|_ Resources, as well as routing
+information.
+
+Such files can get rather long and boring, so the example below is
+only an excerpts of the full ``examples/platforms/small_platform.xml``
+file. For example, most routing information are missing, and only the
+route between the hosts Tremblay and Fafard is given. This path
+traverses 6 links (4, 3, 2, 0, 1 and 8). The full file, along with
+other examples, can be found in the archive under
+``examples/platforms``.
+               
+.. |api_s4u_NetZone| image:: /images/extlink.png
+   :align: middle
+   :width: 12
+.. _api_s4u_NetZone: api/classsimgrid_1_1s4u_1_1NetZone.html#class-documentation
+
+.. |api_s4u_Link| image:: /images/extlink.png
+   :align: middle
+   :width: 12
+.. _api_s4u_Link: api/classsimgrid_1_1s4u_1_1Link.html#class-documentation
+
+.. literalinclude:: ../../examples/platforms/small_platform.xml
+   :language: xml
+   :lines: 1-10,12-20,56-63,192-
+   :caption: (excerpts of the small_platform.xml file)
+
+Deployment File
+...............
+
+Deployment files specify the execution scenario: it lists the actors
+that should be started, along with their parameter. In the following
+example, we start 6 actors: one master and 5 workers.
+
+.. literalinclude:: ../../examples/s4u/app-masterworkers/s4u-app-masterworkers_d.xml
+   :language: xml
+
+Execution Example
+.................
+
+This time, we have all parts: once the program is compiled, we can
+execute it as follows. Note how the XBT_INFO() requests turned into
+informative messages.
+             
+.. literalinclude:: ../../examples/s4u/app-masterworkers/s4u-app-masterworkers.tesh
+   :language: shell
+   :start-after: s4u-app-masterworkers-fun
+   :prepend: $$$ ./masterworkers platform.xml deploy.xml
+   :append: $$$
+   :dedent: 2
+             
+
+..  LocalWords:  SimGrid

diff --git a/tools/cmake/Documentation.cmake b/tools/cmake/Documentation.cmake
index cff5b2c..c25c777 100644 (file)
--- a/tools/cmake/Documentation.cmake
+++ b/tools/cmake/Documentation.cmake
@@ -25,6 +25,7 @@ if(enable_documentation)
     COMMAND ${CMAKE_COMMAND} -E remove_directory ${CMAKE_BINARY_DIR}/doc/html
     COMMAND ${CMAKE_COMMAND} -E make_directory   ${CMAKE_BINARY_DIR}/doc/html
     COMMAND ${CMAKE_COMMAND} -E remove_directory ${CMAKE_BINARY_DIR}/doc/xml
+    COMMAND ${CMAKE_COMMAND} -E remove_directory ${CMAKE_BINARY_DIR}/docs/source/api
     WORKING_DIRECTORY ${CMAKE_BINARY_DIR}/doc
     )