1 /* Copyright (c) 2006-2017. The SimGrid Team. All rights reserved. */
3 /* This program is free software; you can redistribute it and/or modify it
4 * under the terms of the license (GNU LGPL) which comes with this package. */
6 #ifndef SIMGRID_S4U_HOST_HPP
7 #define SIMGRID_S4U_HOST_HPP
11 #include <unordered_map>
13 #include "xbt/Extendable.hpp"
14 #include "xbt/signal.hpp"
15 #include "xbt/string.hpp"
17 #include "simgrid/forward.h"
18 #include "simgrid/s4u/forward.hpp"
23 extern template class XBT_PUBLIC() Extendable<simgrid::s4u::Host>;
31 * An host represents some physical resource with computing and networking capabilities.
33 * All hosts are automatically created during the call of the method
34 * @ref simgrid::s4u::Engine::loadPlatform().
35 * You cannot create a host yourself.
37 * You can retrieve a particular host using simgrid::s4u::Host::byName()
38 * and actors can retrieve the host on which they run using simgrid::s4u::Host::current().
40 XBT_PUBLIC_CLASS Host : public simgrid::xbt::Extendable<Host>
44 explicit Host(const char* name);
46 /** Host destruction logic */
51 bool currentlyDestroying_ = false;
56 Host(Host const&) = delete;
57 Host& operator=(Host const&) = delete;
59 /** Retrieves an host from its name, or return nullptr */
60 static Host* by_name_or_null(const char* name);
61 /** Retrieves an host from its name, or return nullptr */
62 static Host* by_name_or_null(std::string name);
63 /** Retrieves an host from its name, or die */
64 static s4u::Host* by_name(const char* name);
65 /** Retrieves an host from its name, or die */
66 static s4u::Host* by_name(std::string name);
67 /** Retrieves the host on which the current actor is running */
68 static s4u::Host* current();
70 /** Retrieves the name of that host as a C++ string */
71 simgrid::xbt::string const& getName() const { return name_; }
72 /** Retrieves the name of that host as a C string */
73 const char* getCname() const { return name_.c_str(); }
75 void actorList(std::vector<ActorPtr> * whereto);
77 /** Turns that host on if it was previously off
79 * All actors on that host which were marked autorestart will be restarted automatically.
80 * This call does nothing if the host is already on.
83 /** Turns that host off. All actors are forcefully stopped. */
85 /** Returns if that host is currently up and running */
87 /** Returns if that host is currently down and offline */
88 bool isOff() { return not isOn(); }
92 std::map<std::string, std::string>* getProperties();
93 const char* getProperty(const char* key);
94 void setProperty(std::string key, std::string value);
95 void getProcesses(std::vector<ActorPtr> * list);
96 double getPstateSpeed(int pstate_index);
97 int getPstatesCount() const;
98 void setPstate(int pstate_index);
100 void getAttachedStorages(std::vector<const char*> * storages);
102 /** Get an associative list [mount point]->[Storage] of all local mount points.
104 * This is defined in the platform file, and cannot be modified programatically (yet).
106 std::unordered_map<std::string, Storage*> const& getMountedStorages();
108 void routeTo(Host* dest, std::vector<Link*>& links, double* latency);
109 void routeTo(Host* dest, std::vector<surf::LinkImpl*>& links, double* latency);
111 /** Block the calling actor on an execution located on the called host
113 * It is not a problem if the actor is not located on the called host.
114 * The actor will not be migrated in this case. Such remote execution are easy in simulation.
116 void execute(double flops);
118 /** @brief Returns the current computation load (in flops per second) */
122 simgrid::xbt::string name_{"noname"};
123 std::unordered_map<std::string, Storage*>* mounts = nullptr; // caching
126 // TODO, this could be a unique_ptr
127 surf::HostImpl* pimpl_ = nullptr;
128 /** DO NOT USE DIRECTLY (@todo: these should be protected, once our code is clean) */
129 surf::Cpu* pimpl_cpu = nullptr;
130 /** DO NOT USE DIRECTLY (@todo: these should be protected, once our code is clean) */
131 kernel::routing::NetPoint* pimpl_netpoint = nullptr;
133 /*** Called on each newly created host */
134 static simgrid::xbt::signal<void(Host&)> onCreation;
135 /*** Called just before destructing an host */
136 static simgrid::xbt::signal<void(Host&)> onDestruction;
137 /*** Called when the machine is turned on or off (called AFTER the change) */
138 static simgrid::xbt::signal<void(Host&)> onStateChange;
139 /*** Called when the speed of the machine is changed (called AFTER the change)
140 * (either because of a pstate switch or because of an external load event coming from the profile) */
141 static simgrid::xbt::signal<void(Host&)> onSpeedChange;
144 } // namespace simgrid::s4u
146 extern int USER_HOST_LEVEL;
148 #endif /* SIMGRID_S4U_HOST_HPP */
155 * This method returns the number of tasks currently running on a host.
156 * The external load (coming from an availability trace) is not taken in account.
158 * @return The number of tasks currently running on a host.
160 public native int getLoad();