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18 The S4U interface (SimGrid for you) mixes the full power of SimGrid
19 with the full power of C++. This is the prefered interface to describe
20 abstract algorithms in the domains of Cloud, P2P, HPC, IoT and similar
26 A typical SimGrid simulation is composed of several |Actors|_, that
27 execute user-provided functions. The actors have to explicitly use the
28 S4U interface to express their
29 :ref:`computation <exhale_class_classsimgrid_1_1s4u_1_1Exec>`,
30 :ref:`communication <exhale_class_classsimgrid_1_1s4u_1_1Comm>`,
31 :ref:`disk usage <exhale_class_classsimgrid_1_1s4u_1_1Io>`,
32 and other |Activities|_, so that they get reflected within the
33 simulator. These activities take place on resources such as |Hosts|_,
34 |Links|_ and |Storages|_. SimGrid predicts the time taken by each
35 activity and orchestrates accordingly the actors waiting for the
36 completion of these activities.
39 When **communicating**, data is not directly sent to other actors but
40 posted onto a |Mailbox|_ that serve as rendez-vous point between
41 communicating actors. This means that you don't need to know who you
42 are talking to, you just put your communication `Send` request in a
43 mailbox, and it will be matched with a complementary `Receive`
44 request. Alternatively, actors can interact through **classical
45 synchronization mechanisms** such as |Barrier|_, |Semaphore|_,
46 |Mutex|_ and |ConditionVariable|_.
48 Each actor is located on a simulated |Host|_. Each host is located
49 itself in a |NetZone|_, that knows the networking path between one
50 resource to another. Each NetZone is included in another one, forming
51 a tree of NetZones which root zone contains the whole platform.
53 The :ref:`simgrid::s4u::this_actor
54 <namespace_simgrid__s4u__this_actor>` namespace provides many helper
55 functions to simplify the code of actors.
59 - :ref:`class s4u::Actor <exhale_class_classsimgrid_1_1s4u_1_1Actor>`:
60 Active entities executing your application.
61 - :ref:`class s4u::Engine <exhale_class_classsimgrid_1_1s4u_1_1Engine>`
62 Simulation engine (singleton).
63 - :ref:`class s4u::Mailbox <exhale_class_classsimgrid_1_1s4u_1_1Mailbox>`
64 Communication rendez-vous.
66 - **Platform Elements**
68 - :ref:`class s4u::Host <exhale_class_classsimgrid_1_1s4u_1_1Host>`:
69 Actor location, providing computational power.
70 - :ref:`class s4u::Link <exhale_class_classsimgrid_1_1s4u_1_1Link>`
71 Interconnecting hosts.
72 - :ref:`class s4u::NetZone <exhale_class_classsimgrid_1_1s4u_1_1NetZone>`:
73 Sub-region of the platform, containing resources (Hosts, Link, etc).
74 - :ref:`class s4u::Storage <exhale_class_classsimgrid_1_1s4u_1_1Storage>`
75 Resource on which actors can write and read data.
76 - :ref:`class s4u::VirtualMachine <exhale_class_classsimgrid_1_1s4u_1_1VirtualMachine>`:
77 Execution containers that can be moved between Hosts.
79 - **Activities** (:ref:`class s4u::Activity <exhale_class_classsimgrid_1_1s4u_1_1Activity>`):
80 The things that actors can do on resources
82 - :ref:`class s4u::Comm <exhale_class_classsimgrid_1_1s4u_1_1Comm>`
83 Communication activity, started on Mailboxes and consuming links.
84 - :ref:`class s4u::Exec <exhale_class_classsimgrid_1_1s4u_1_1Exec>`
85 Computation activity, started on Host and consuming CPU resources.
86 - :ref:`class s4u::Io <exhale_class_classsimgrid_1_1s4u_1_1Io>`
87 I/O activity, started on and consumming Storages.
89 - **Synchronization Mechanisms**: Classical IPC that actors can use
91 - :ref:`class s4u::Barrier <exhale_class_classsimgrid_1_1s4u_1_1Barrier>`
92 - :ref:`class s4u::ConditionVariable <exhale_class_classsimgrid_1_1s4u_1_1ConditionVariable>`
93 - :ref:`class s4u::Mutex <exhale_class_classsimgrid_1_1s4u_1_1Mutex>`
94 - :ref:`class s4u::Semaphore <exhale_class_classsimgrid_1_1s4u_1_1Semaphore>`
97 .. |Actors| replace:: **Actors**
98 .. _Actors: api/classsimgrid_1_1s4u_1_1Actor.html
100 .. |Activities| replace:: **Activities**
101 .. _Activities: api/classsimgrid_1_1s4u_1_1Activity.html
103 .. |Hosts| replace:: **Hosts**
104 .. _Hosts: api/classsimgrid_1_1s4u_1_1Host.html
106 .. |Links| replace:: **Links**
107 .. _Links: api/classsimgrid_1_1s4u_1_1Link.html
109 .. |Storages| replace:: **Storages**
110 .. _Storages: api/classsimgrid_1_1s4u_1_1Storage.html
112 .. |VirtualMachines| replace:: **VirtualMachines**
113 .. _VirtualMachines: api/classsimgrid_1_1s4u_1_1VirtualMachine.html
115 .. |Host| replace:: **Host**
116 .. _Host: api/classsimgrid_1_1s4u_1_1Host.html
118 .. |Mailbox| replace:: **Mailbox**
119 .. _Mailbox: api/classsimgrid_1_1s4u_1_1Mailbox.html
121 .. |NetZone| replace:: **NetZone**
122 .. _NetZone: api/classsimgrid_1_1s4u_1_1NetZone.html
124 .. |Barrier| replace:: **Barrier**
125 .. _Barrier: api/classsimgrid_1_1s4u_1_1Barrier.html
127 .. |ConditionVariable| replace:: **ConditionVariable**
128 .. _ConditionVariable: api/classsimgrid_1_1s4u_1_1ConditionVariable.html
130 .. |Mutex| replace:: **Mutex**
131 .. _Mutex: api/classsimgrid_1_1s4u_1_1Mutex.html