start the DIY part of the S4U tuto

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diff --git a/doc/sc3-description.png b/docs/source/images/tuto-masterworkers-result.png
similarity index 100%
rename from doc/sc3-description.png
rename to docs/source/images/tuto-masterworkers-result.png

diff --git a/docs/source/install_yours.rst b/docs/source/install_yours.rst
index 920bbbf..2258c4c 100644 (file)
--- a/docs/source/install_yours.rst
+++ b/docs/source/install_yours.rst
@@ -138,7 +138,9 @@ modify the examples directly but instead create your own project in
 eclipse. This will make it easier to upgrade to another version of
 SimGrid.
 
-Troubleshooting your project setup
+.. _install_yours_troubleshooting:
+
+Troubleshooting your Project Setup
 ----------------------------------
 
 Library not found

diff --git a/docs/source/usecase_algorithms.rst b/docs/source/usecase_algorithms.rst
index a66d8b8..c70270e 100644 (file)
--- a/docs/source/usecase_algorithms.rst
+++ b/docs/source/usecase_algorithms.rst
@@ -9,7 +9,7 @@ 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,
+have to explicitly use the S4U interface 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
@@ -44,8 +44,8 @@ communicating processes.
 .. _api_s4u_Mailbox: api/classsimgrid_1_1s4u_1_1Mailbox.html#class-documentation
 
 
-The Master/Workers Example
---------------------------
+Discover the Master/Workers
+---------------------------
 
 This section introduces a first example of SimGrid simulation. This
 simple application is composed of two kind of actors: the **master**
@@ -75,7 +75,7 @@ given as a vector of strings:
 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
+incoming 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. 
@@ -89,7 +89,7 @@ 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.
+nicely logged along with the simulated time and actor name.
  
      
 .. literalinclude:: ../../examples/s4u/app-masterworkers/s4u-app-masterworkers-fun.cpp
@@ -99,7 +99,7 @@ nicely loggued along with the simulated time and actor name.
 
 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
+on which mailbox its incoming 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.      
@@ -189,4 +189,141 @@ informative messages.
    :dedent: 2
              
 
+Improve it Yourself
+-------------------
+
+In this section, you will modify the example presented earlier to
+explore the quality of the proposed algorithm. For now, it works and
+the simulation prints things, but the truth is that we have no idea of
+whether this is a good algorithm to dispatch tasks to the workers.
+This very simple setting raises many interesting questions:
+
+.. image:: /images/tuto-masterworkers-question.svg
+   :align: center
+
+- Which algorithm should the master use? Or should the worker decide
+  by themselves?
+
+    Round Robin is not an efficient algorithm when all tasks are not
+    processed at the same speed.  It would probably be more efficient
+    if the workers were asking for tasks when ready.
+
+- Should tasks be grouped in batches or sent separately?
+
+    The workers will starve if they don't get the tasks fast
+    enough. One possibility to reduce latency would be to send tasks
+    in pools instead of one by one. But if the pools are too big, the
+    load balancing will likely get uneven, in particular when
+    distributing the last tasks.
+
+- How does the quality of such algorithm dependent on the platform
+  characteristics and on the task characteristics?
+
+    Whenever the input communication time is very small compared to
+    processing time and workers are homogeneous, it is likely that the
+    round-robin algorithm performs very well. Would it still hold true
+    when transfer time is not negligible? What if some tasks are
+    performed faster on some specific nodes?
+          
+- The network topology interconnecting the master and the workers
+  may be quite complicated. How does such a topology impact the
+  previous result?
+
+    When data transfers are the bottleneck, it is likely that a good
+    modeling of the platform becomes essential. The SimGrid platform
+    models are particularly handy to account for complex platform
+    topologies.
+
+- What is the best applicative topology?
+
+    Is a flat master worker deployment sufficient? Should we go for a
+    hierarchical algorithm, with some forwarders taking large pools of
+    tasks from the master, each of them distributing their tasks to a
+    sub-pool of workers? Or should we introduce super-peers,
+    dupplicating the master's role in a peer-to-peer manner?  Do the
+    algorithms require a perfect knowledge of the network?
+
+- How is such an algorithm sensitive to external workload variation?
+
+    What if bandwidth, latency and computing speed can vary with no
+    warning?  Shouldn't you study whether your algorithm is sensitive
+    to such load variations?
+
+- Although an algorithm may be more efficient than another, how does
+  it interfere with unrelated applications executing on the same
+  facilities?
+
+**SimGrid was invented to answer such questions.** Do not believe the
+fools saying that all you need to study such settings is a simple
+discrete event simulator. Do you really want to reinvent the wheel,
+debug your own tool, optimize it and validate its models against real
+settings for ages, or do you prefer to sit on the shoulders of a
+giant? With SimGrid, you can focus on your algorithm. The whole
+simulation mechanism is already working.
+
+Here is the visualization of a SimGrid simulation of two master worker
+applications (one in light gray and the other in dark gray) running in
+concurrence and showing resource usage over a long period of time. It
+was obtained with the Triva software.
+
+.. image:: /images/tuto-masterworkers-result.png
+   :align: center
+
+Prerequisite
+............
+
+Before your proceed, you need to :ref:`install SimGrid <install>`, a
+C++ compiler and also ``pajeng`` to visualize the traces. The provided
+code template requires cmake to compile. On Debian and Ubuntu for
+example, you can get them as follows:
+
+.. code-block:: shell
+
+   sudo apt install simgrid pajeng cmake g++
+
+An initial version of the source code is provided on framagit. This
+template compiles with cmake. If SimGrid is correctly installed, you
+should be able to clone the repository and recompile everything as
+follows:
+
+.. code-block:: shell
+
+   git clone git@framagit.org:simgrid/simgrid-template-s4u.git
+   cd simgrid-template-s4u/
+   cmake .
+   make
+
+If you struggle with the compilation, then you should double check
+your :ref:`SimGrid installation <install>`.  On need, please refer to
+the :ref:`Troubleshooting your Project Setup
+<install_yours_troubleshooting>` section.
+
+Discovering the Provided Code
+.............................
+
+Please compile and execute the provided simulator as follows:
+
+
+.. code-block:: shell
+
+   make master-workers
+   ./master-workers small_platform.xml master-workers_d.xml
+
+For a more "fancy" output, you can use simgrid-colorizer. 
+
+.. code-block:: shell
+
+   ./master-workers small_platform.xml master-workers_d.xml 2>&1 | simgrid-colorizer
+
+If you installed SimGrid to a non-standard path, you may have to
+specify the full path to simgrid-colorizer on the above line, such as
+``/opt/simgrid/bin/simgrid-colorizer``. If you did not install it at all,
+you can find it in <simgrid_root_directory>/bin/colorize.
+
+.. todo::
+
+   Explain how to generate a Gantt-Chart with S4U and pajeng.
+
+
+
 ..  LocalWords:  SimGrid