2 \page inside_extending Extending SimGrid
6 \section simgrid_dev_guide_model How to add a new model in surf?
7 The figure below show the architecture of the SURF layer. This layer is composed
8 of different kind of models representing the differents systems we want to
9 modelize (i.e.cpu, network, storage, workstation, virtual machine).
11 A model in simgrid is composed of three classes: Model, Resource and Action
14 \image html surf++.png
15 \image latex surf++.pdf "surf++" width=\textwidth
17 Actually there are five kind of models: CpuModel, NetworkModel, WorkstationModel,
18 WorkstationVMModel and StorageModel. For each kind of model, there is an
19 interface (e.g.: cpu_interface.hpp) and some implementations (e.g.: cpu_cas01.hpp,
23 void surf_cpu_model_init_Cas01()
24 s_surf_model_description_t surf_network_model_description[] = {
26 \subsection simgrid_dev_guide_model_implem How to add a new model implementation in surf?
28 If you want to create a new implementation of a kind of model you must extend
29 the classes of the corresponding interfaces.
31 For instance, if you want to add a new cup model called `Plop`, create two files
32 cpu_plop.hpp and cpu_plop_cpp which contains classes CpuPlopModel, CpuPlop and
33 CpuPlopAction implementating respectively the interfaces CpuModel, Cpu and
34 CpuAction. You also need to define a initializing function like this:
37 void surf_cpu_model_init_plop()
39 xbt_assert(!surf_cpu_model_pm);
41 surf_cpu_model_pm = new CpuPlopModel();
43 sg_platf_host_add_cb(cpu_parse_init);
44 sg_platf_postparse_add_cb(cpu_add_traces);
46 xbt_dynar_push(model_list, &surf_cpu_model_pm);
50 and add an entry in the corresponding array in surf_interface.cpp
53 s_surf_model_description_t surf_cpu_model_description[] = {
55 "Simplistic CPU model (time=size/power).",
56 surf_cpu_model_init_Cas01},
58 "The new plop CPU model.",
59 surf_cpu_model_init_plop},
60 {NULL, NULL, NULL} // this array must be NULL terminated
64 \subsection simgrid_dev_guide_model_kind How to add a new kind of model in surf?
66 If you want to create a new kind of model, you must create a new interface
67 where you extend the classes Model, Resource and Action, and then create an
68 implementation of this interface.
71 \section simgrid_dev_guide_surf_callbacks How to use surf callbacks?
73 Adding features to surf could also be handle by using surf callbacks (instead
74 of adding new implementation model). The list of available callbacks is
75 accessible there \ref SURF_callbacks. An example of using surf callbacks is the
76 energy plugin. If you want to add a plugin you need to define callback function
77 and to connect them to callbacks handler in an initialization function.
80 static void MyNetworkLinkCreatedCallback(NetworkLinkPtr cpu){
84 static void MyNetworkLinkDestructedCallback(NetworkLinkPtr cpu){
88 static void MyNetworkCommunicationCallback(NetworkActionPtr cpu,
94 void sg_my_network_plugin_init() {
95 surf_callback_connect(networkLinkCreatedCallbacks,
96 MyNetworkLinkCreatedCallback);
97 surf_callback_connect(networkLinkDestructedCallbacks,
98 MyNetworkLinkDestructedCallback);
99 surf_callback_connect(networkCommunicationCallbacks,
100 MyNetworkCommunicationCallback);
104 Then you need to add an entry in surf_interface.cpp refering to your
105 initialization function.
108 s_surf_model_description_t surf_plugin_description[] = {
110 "Cpu energy consumption.",
111 sg_energy_plugin_init},
113 "My network plugin.",
114 sg_my_network_plugin_init},
115 {NULL, NULL, NULL} // this array must be NULL terminated
119 \section simgrid_dev_guide_simcall How to add a new simcall?
120 A simcall is used to go from user mode to kernel mode. The workflow of
121 a simcall is the following:
123 - `<ret> simcall_<name>(<args>)`
124 - `simcall_BODY_<name>(<args>)`
126 - `SIMIX_process_yield` if not maestro
127 - ========== KERNEL MODE ==========
128 - `SIMIX_simcall_pre`
129 - `SIMIX_pre_<name>(simcall, <args>)`
130 - `SIMIX_simcall_answer(simcall)`
132 To simplify the simcall creation, we have made a python script that
133 generate most of the code and give helpers for the remaining stuff.
134 The script generating the simcalls (src/simix/simcalls.in) take in input
135 the src/simix/simcalls.in file where the simcalls are defined and generate
138 - simcall_generated_args_getter_setter.h:
139 functions to get and set simcall arguments
140 - simcall_generated_res_getter_setter.h:
141 functions to get and set simcall result
142 - simcall_generated_body.c:
143 the BODY function of the simcall
144 - simcall_generated_case.c:
145 the case of the SIMIX_simcall_pre function
146 - simcall_generated_enum.h:
148 - simcall_generated_string.c:
149 string corresponding to the enum to debug
151 Furthermode if the simcall_<name> or the SIMIX_pre_<name> function are missing,
152 a warning will show up with a prototype of the corresponding fonction to fill.
154 The simcall.in file list all the simcalls in sections. A line starting by "##"
155 define a new section which will be replace by a "ifdef" in the generated code.
156 There is a simcall by line which follow this format:
159 Simcall -> Name HasAnswer Res Args
161 Has_Answer -> "True" | "False"
162 Res -> "(" Type MaybeCast ")"
163 Args -> Args Arg | Arg
164 Arg -> "(" Name "," Type MaybeCast ")"
165 Type -> "char" | "const char*" | "int" | "long" | "unsigned char" | "unsigned short" | "unsigned int" | "unsigned long" | "float" | "double" | "void*" | "FPtr" | "const void*" | "size_t" | "sg_size_t" | "void" | "void*"
166 MaybeCast -> "," Cast | ""
170 \section simgrid_dev_guide_tag What is How to add a new tag for xml files?
171 Search for expression \"TUTORIAL: New TAG\".
173 user@caraja:~/workspace/simgrid/src$ cg "TUTORIAL: New TAG"
174 0 surf/sg_platf.c 43 /* TUTORIAL: New TAG*/
175 1 surf/sg_platf.c 89 /* TUTORIAL: New TAG*/
176 2 surf/sg_platf.c 124 /* TUTORIAL: New TAG*/
177 3 surf/sg_platf.c 337 /* TUTORIAL: New TAG*/
178 4 surf/surfxml_parse.c 769 /* TUTORIAL: New TAG*/
179 5 surf/surf_private.h 205 /* TUTORIAL: New TAG*/
180 6 surf/surfxml_parseplatf.c 64 /* TUTORIAL: New TAG*/
181 7 surf/surfxml_parseplatf.c 85 /* TUTORIAL: New TAG*/
182 8 include/simgrid/platf_interface.h 42 /* TUTORIAL: New TAG*/