1 /*! \page bindings Bindings
4 \section bindings_binding_Java Java Binding
5 <a href="http://simgrid.gforge.inria.fr/simgrid-java/1.2/doc/">Simgrid-Java documentation</a>.
7 \section bindings_binding_Ruby Ruby Binding
8 <a href="http://simgrid.gforge.inria.fr/simgrid-ruby/1.0/doc/">Simgrid-Ruby documentation</a>.
10 \section bindings_binding_lua Lua Binding
12 Most of Simgrid modules require a good level in C programming, since simgrid is used to be as standard C library.
13 Sometime users prefer using some kind of “easy scripts” or a language easier to code with, for their works,
14 which avoid dealing with C errors, and sometime an important gain of time.
15 Besides Java Binding, Lua and Ruby bindings are available since version 3.4 of Simgrid
16 for MSG Module, and we are currenlty working on bindings for other modules.
19 \subsection bindings_binding_lua_about What is lua ?
20 Lua is a lightweight, reflective, imperative and functional programming language,
21 designed as a scripting language with extensible semantics as a primary goal (see official web site <a href="http://www.lua.org">here</a>).
22 \subsubsection bindings_binding_lua_why Why lua ?
23 Lua is a fast, portable and powerful script language, quite simple to use for developpers.
24 it combines procedural features with powerful data description facilities,
25 by using a simple, yet powerful, mechanism of tables.
26 Lua has a relatively simple C API compared to other scripting languages,
27 and accordingly it provides a robust, easy to use it.
28 \subsubsection bindings_binding_lua_simgrid How to use lua in Simgrid ?
29 Actually, the use of lua in Simgrid is quite simple, you have just to follow the same steps as coding with C in Simgird :
30 - Coding functions coresponding to each process
31 - loading the platforme/deployment XML file that describe the environment of simulation
32 - and … Running the Simulation.
34 \dontinclude lua/masterslave/master.lua
35 \subsection bindings_binding_lua_example_master_slave Master/Slave Example
39 we mainly use simgrid.Task.new(task_name,computation_size,communication_size) to create our MSG Task,
40 then simgrid.Task.send(task,alias) to send it.
41 we use also simgrid.Task.name(task), to get the task's name.
43 \dontinclude lua/masterslave/slave.lua
46 Here, we see the use of simgrid.Task.recv(alias) to receive a task with a specific alias,
47 this function return directly the task recevied.
49 \dontinclude lua/masterslave/master_slave.lua
50 \li Set Environmenet and run application
51 \until simgrid.clean()
53 \subsection bindings_binding_lua_example_data Exchanging Data
54 You can also exchange data between Process using lua. for that, you have to deal with lua task as a table,
55 since lua is based itself on a mechanism of tables,
56 so you can exchange any kind of data (tables, matrix, strings,…) between process via tasks.
60 task = simgrid.Task.new("data_task",task_comp,task_comm);
61 task['matrix'] = my_matrix;
62 task['table'] = my_table;
63 task['message'] = "Hello from (Lua || Simgrid ) !! "
65 simgrid.Task.send(task,alias)
67 After creating task, we associate to it various kind of data with a specific key (string in this case)
68 to distinguish between data variables. The receiver will use this key to access easily to datas.
73 task = simgrid.Task.recv(alias);
74 sender_matrix = task['matrix'];
75 sender_table = task['table'];
76 sender_message = task['message']
79 Note that in lua, both sender and receiver share the same lua task.
80 So that the receiver could joint data directly on the received task without sending it back.
81 You can find a complet example (matrix multiplication case) in the file example/lua/mult_matrix.lua.
84 \subsection bindings_binding_lua_example_bypass Bypass XML
85 maybe you wonder if there is a way to bypass the XML files,
86 and describe your platform directly from the code, with lua bindings it's Possible !! how ?
87 We provide some additional (tricky?) functions in lua that allows you to set up your own platform without using the XML files
88 ( this can be useful for large platforms, so a simple for loop will avoid you to deal with an annoying XML File ;) )
93 simgrid.AS.new{id="AS0",mode="Full"};
98 simgrid.Host.new{id="Tremblay",power=98095000};
99 simgrid.Host.new{id="Jupiter",power=76296000};
100 simgrid.Host.new{id="Fafard",power=76296000};
101 simgrid.Host.new{id="Ginette",power=48492000};
102 simgrid.Host.new{id="Bourassa",power=48492000};
104 we use simgrid.Host.new{id=id_host,power=power_host} to instanciate our hosts.
109 simgrid.Link.new{id=i,bandwidth=252750+ i*768,latency=0.000270544+i*0.087}; -- some crazy values ;)
112 we used simgrid.Link.new{id=link_id,bandwidth=bw,latency=lat} with a simple for loop to create all links we need (much easier than XML hein ?)
116 -- simgrid.Route.new(src_id,des_id,links_nb,links_list)
117 simgrid.Route.new("Tremblay","Jupiter",1,{"1"});
118 simgrid.Route.new("Tremblay","Fafard",6,{"0","1","2","3","4","8"});
119 simgrid.Route.new("Tremblay","Ginette",3,{"3","4","5"});
120 simgrid.Route.new("Tremblay","Bourassa",7,{"0","1","3","2","4","6","7"});
122 simgrid.Route.new("Jupiter","Tremblay",1,{"1"});
123 simgrid.Route.new("Jupiter","Fafard",7,{"0","1","2","3","4","8","9"});
124 simgrid.Route.new("Jupiter","Ginette",4,{"3","4","5","9"});
125 simgrid.Route.new("Jupiter","Bourassa",8,{"0","1","2","3","4","6","7","9"});
128 for each host you have to specify which route to choose to access to the rest of hosts connected in the grid.
132 simgrid.register_platform();
134 Don't forget to register your platform, that SURF callbacks starts their work ;)
138 simgrid.Host.setFunction("Tremblay","Master",4,{"20","550000000","1000000","4"});
139 simgrid.Host.setFunction("Bourassa","Slave",1,{"0"});
140 simgrid.Host.setFunction("Jupiter","Slave",1,{"1"});
141 simgrid.Host.setFunction("Fafard","Slave",1,{"2"});
142 simgrid.Host.setFunction("Ginette","Slave",1,{"3"});
144 you don't need to use a deployment XML file, thanks to simgrid.Host.setFunction(host_id,function,args_number,args_list)
145 you can associate functions for each host with arguments if needed .
149 simgrid.register_application();
151 Yes, Here too you have to register your application before running the simulation.
153 the full example is distributed in the file examples/lua/master_slave_bypass.lua