1 /* Copyright (c) 2013-2021. 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 #include "src/plugins/vm/VirtualMachineImpl.hpp"
7 #include "simgrid/Exception.hpp"
8 #include "simgrid/kernel/routing/NetZoneImpl.hpp"
9 #include "simgrid/s4u/Engine.hpp"
10 #include "simgrid/s4u/Exec.hpp"
11 #include "simgrid/sg_config.hpp"
12 #include "src/include/surf/surf.hpp"
13 #include "src/kernel/EngineImpl.hpp"
14 #include "src/kernel/activity/ExecImpl.hpp"
15 #include "src/surf/cpu_cas01.hpp"
16 #include "src/surf/cpu_ti.hpp"
18 XBT_LOG_NEW_DEFAULT_SUBCATEGORY(res_vm, ker_resource, "Virtual Machines, containing actors and mobile across hosts");
20 void surf_vm_model_init_HL13(simgrid::kernel::resource::CpuModel* cpu_pm_model)
22 auto vm_model = std::make_shared<simgrid::vm::VMModel>("VM_HL13");
23 auto* engine = simgrid::kernel::EngineImpl::get_instance();
25 engine->add_model(vm_model, {cpu_pm_model});
26 std::shared_ptr<simgrid::kernel::resource::CpuModel> cpu_model_vm;
28 auto cpu_optim = simgrid::config::get_value<std::string>("cpu/optim");
29 if (cpu_optim == "TI") {
30 cpu_model_vm = std::make_shared<simgrid::kernel::resource::CpuTiModel>("VmCpu_TI");
32 cpu_model_vm = std::make_shared<simgrid::kernel::resource::CpuCas01Model>("VmCpu_Cas01");
34 engine->add_model(cpu_model_vm, {cpu_pm_model, vm_model.get()});
35 engine->get_netzone_root()->set_cpu_vm_model(cpu_model_vm);
40 template class xbt::Extendable<vm::VirtualMachineImpl>;
48 std::deque<s4u::VirtualMachine*> VirtualMachineImpl::allVms_;
50 /* In the real world, processes on the guest operating system will be somewhat degraded due to virtualization overhead.
51 * The total CPU share these processes get is smaller than that of the VM process gets on a host operating system.
52 * FIXME: add a configuration flag for this
54 const double virt_overhead = 1; // 0.95
56 static void host_state_change(s4u::Host const& host)
58 if (not host.is_on()) { // just turned off.
59 std::vector<s4u::VirtualMachine*> trash;
60 /* Find all VMs living on that host */
61 for (s4u::VirtualMachine* const& vm : VirtualMachineImpl::allVms_)
62 if (vm->get_pm() == &host)
64 for (s4u::VirtualMachine* vm : trash)
69 static void add_active_exec(s4u::Exec const& task)
71 const s4u::VirtualMachine* vm = dynamic_cast<s4u::VirtualMachine*>(task.get_host());
73 VirtualMachineImpl* vm_impl = vm->get_vm_impl();
74 vm_impl->add_active_exec();
75 vm_impl->update_action_weight();
79 static void remove_active_exec(s4u::Exec const& task)
81 const s4u::VirtualMachine* vm = dynamic_cast<s4u::VirtualMachine*>(task.get_host());
83 VirtualMachineImpl* vm_impl = vm->get_vm_impl();
84 vm_impl->remove_active_exec();
85 vm_impl->update_action_weight();
89 static s4u::VirtualMachine* get_vm_from_activity(kernel::activity::ActivityImpl const& act)
91 auto* exec = dynamic_cast<kernel::activity::ExecImpl const*>(&act);
92 return exec != nullptr ? dynamic_cast<s4u::VirtualMachine*>(exec->get_host()) : nullptr;
95 static void add_active_activity(kernel::activity::ActivityImpl const& act)
97 const s4u::VirtualMachine* vm = get_vm_from_activity(act);
99 VirtualMachineImpl* vm_impl = vm->get_vm_impl();
100 vm_impl->add_active_exec();
101 vm_impl->update_action_weight();
105 static void remove_active_activity(kernel::activity::ActivityImpl const& act)
107 const s4u::VirtualMachine* vm = get_vm_from_activity(act);
109 VirtualMachineImpl* vm_impl = vm->get_vm_impl();
110 vm_impl->remove_active_exec();
111 vm_impl->update_action_weight();
115 VMModel::VMModel(const std::string& name) : HostModel(name)
117 s4u::Host::on_state_change.connect(host_state_change);
118 s4u::Exec::on_start.connect(add_active_exec);
119 s4u::Exec::on_completion.connect(remove_active_exec);
120 kernel::activity::ActivityImpl::on_resumed.connect(add_active_activity);
121 kernel::activity::ActivityImpl::on_suspended.connect(remove_active_activity);
124 double VMModel::next_occurring_event(double now)
126 /* TODO: update action's cost with the total cost of processes on the VM. */
128 /* 1. Now we know how many resource should be assigned to each virtual
129 * machine. We update constraints of the virtual machine layer.
131 * If we have two virtual machine (VM1 and VM2) on a physical machine (PM1).
132 * X1 + X2 = C (Equation 1)
134 * the resource share of VM1: X1
135 * the resource share of VM2: X2
136 * the capacity of PM1: C
138 * Then, if we have two process (P1 and P2) on VM1.
139 * X1_1 + X1_2 = X1 (Equation 2)
141 * the resource share of P1: X1_1
142 * the resource share of P2: X1_2
143 * the capacity of VM1: X1
145 * Equation 1 was solved in the physical machine layer.
146 * Equation 2 is solved in the virtual machine layer (here).
147 * X1 must be passed to the virtual machine layer as a constraint value.
150 /* iterate for all virtual machines */
151 for (s4u::VirtualMachine* const& ws_vm : VirtualMachineImpl::allVms_) {
152 if (ws_vm->get_state() == s4u::VirtualMachine::State::SUSPENDED) // Ignore suspended VMs
155 const kernel::resource::CpuImpl* cpu = ws_vm->get_cpu();
157 // solved_value below is X1 in comment above: what this VM got in the sharing on the PM
158 double solved_value = ws_vm->get_vm_impl()->get_action()->get_rate();
159 XBT_DEBUG("assign %f to vm %s @ pm %s", solved_value, ws_vm->get_cname(), ws_vm->get_pm()->get_cname());
161 kernel::lmm::System* vcpu_system = cpu->get_model()->get_maxmin_system();
162 vcpu_system->update_constraint_bound(cpu->get_constraint(), virt_overhead * solved_value);
164 /* actual next occurring event is determined by VM CPU model at surf_solve */
172 VirtualMachineImpl::VirtualMachineImpl(const std::string& name, s4u::VirtualMachine* piface,
173 simgrid::s4u::Host* host_PM, int core_amount, size_t ramsize)
174 : HostImpl(name, piface), piface_(piface), physical_host_(host_PM), core_amount_(core_amount), ramsize_(ramsize)
176 /* Register this VM to the list of all VMs */
177 allVms_.push_back(piface);
178 /* We create cpu_action corresponding to a VM process on the host operating system. */
179 /* TODO: we have to periodically input GUESTOS_NOISE to the system? how ?
180 * The value for GUESTOS_NOISE corresponds to the cost of the global action associated to the VM. It corresponds to
181 * the cost of a VM running no tasks.
183 action_ = physical_host_->get_cpu()->execution_start(0, core_amount_);
185 // It's empty for now, so it should not request resources in the PM
186 update_action_weight();
188 XBT_VERB("Create VM(%s)@PM(%s)", name.c_str(), physical_host_->get_cname());
191 /** @brief A physical host does not disappear in the current SimGrid code, but a VM may disappear during a simulation */
192 void VirtualMachineImpl::vm_destroy()
194 s4u::VirtualMachine::on_destruction(*piface_);
195 /* I was already removed from the allVms set if the VM was destroyed cleanly */
196 auto iter = find(allVms_.begin(), allVms_.end(), piface_);
197 if (iter != allVms_.end())
200 /* Free the cpu_action of the VM. */
201 XBT_ATTRIB_UNUSED bool ret = action_->unref();
202 xbt_assert(ret, "Bug: some resource still remains");
205 void VirtualMachineImpl::suspend(smx_actor_t issuer)
207 if (vm_state_ != s4u::VirtualMachine::State::RUNNING)
208 throw VmFailureException(XBT_THROW_POINT,
209 xbt::string_printf("Cannot suspend VM %s: it is not running.", piface_->get_cname()));
210 if (issuer->get_host() == piface_)
211 throw VmFailureException(XBT_THROW_POINT, xbt::string_printf("Actor %s cannot suspend the VM %s in which it runs",
212 issuer->get_cname(), piface_->get_cname()));
214 XBT_DEBUG("suspend VM(%s), where %zu actors exist", piface_->get_cname(), get_actor_count());
218 foreach_actor([](auto& actor) {
219 XBT_DEBUG("suspend %s", actor.get_cname());
223 XBT_DEBUG("suspend all actors on the VM done done");
225 vm_state_ = s4u::VirtualMachine::State::SUSPENDED;
228 void VirtualMachineImpl::resume()
230 if (vm_state_ != s4u::VirtualMachine::State::SUSPENDED)
231 throw VmFailureException(XBT_THROW_POINT,
232 xbt::string_printf("Cannot resume VM %s: it was not suspended", piface_->get_cname()));
234 XBT_DEBUG("Resume VM %s, containing %zu actors.", piface_->get_cname(), get_actor_count());
238 foreach_actor([](auto& actor) {
239 XBT_DEBUG("resume %s", actor.get_cname());
243 vm_state_ = s4u::VirtualMachine::State::RUNNING;
246 /** @brief Power off a VM.
248 * All hosted processes will be killed, but the VM state is preserved on memory.
249 * It can later be restarted.
251 * @param issuer the actor requesting the shutdown
253 void VirtualMachineImpl::shutdown(smx_actor_t issuer)
255 if (vm_state_ != s4u::VirtualMachine::State::RUNNING)
256 XBT_VERB("Shutting down the VM %s even if it's not running but in state %s", piface_->get_cname(),
257 s4u::VirtualMachine::to_c_str(get_state()));
259 XBT_DEBUG("shutdown VM %s, that contains %zu actors", piface_->get_cname(), get_actor_count());
261 foreach_actor([issuer](auto& actor) {
262 XBT_DEBUG("kill %s@%s on behalf of %s which shutdown that VM.", actor.get_cname(), actor.get_host()->get_cname(),
263 issuer->get_cname());
264 issuer->kill(&actor);
267 set_state(s4u::VirtualMachine::State::DESTROYED);
269 /* FIXME: we may have to do something at the surf layer, e.g., vcpu action */
272 /** @brief Change the physical host on which the given VM is running
274 * This is an instantaneous migration.
276 void VirtualMachineImpl::set_physical_host(s4u::Host* destination)
278 std::string vm_name = piface_->get_name();
279 std::string pm_name_src = physical_host_->get_name();
280 std::string pm_name_dst = destination->get_name();
282 /* update net_elm with that of the destination physical host */
283 piface_->set_netpoint(destination->get_netpoint());
285 /* Adapt the speed, pstate and other physical characteristics to the one of our new physical CPU */
286 piface_->get_cpu()->reset_vcpu(destination->get_cpu());
288 physical_host_ = destination;
290 /* Update vcpu's action for the new pm */
291 /* create a cpu action bound to the pm model at the destination. */
292 kernel::resource::CpuAction* new_cpu_action = destination->get_cpu()->execution_start(0, this->core_amount_);
294 if (action_->get_remains_no_update() > 0)
295 XBT_CRITICAL("FIXME: need copy the state(?), %f", action_->get_remains_no_update());
297 /* keep the bound value of the cpu action of the VM. */
298 double old_bound = action_->get_bound();
300 XBT_DEBUG("migrate VM(%s): set bound (%f) at %s", vm_name.c_str(), old_bound, pm_name_dst.c_str());
301 new_cpu_action->set_bound(old_bound);
304 XBT_ATTRIB_UNUSED bool ret = action_->unref();
305 xbt_assert(ret, "Bug: some resource still remains");
307 action_ = new_cpu_action;
309 XBT_DEBUG("migrate VM(%s): change PM (%s to %s)", vm_name.c_str(), pm_name_src.c_str(), pm_name_dst.c_str());
312 void VirtualMachineImpl::set_bound(double bound)
315 action_->set_user_bound(user_bound_);
316 update_action_weight();
319 void VirtualMachineImpl::update_action_weight()
321 /* The impact of the VM over its PM is the min between its vCPU amount and the amount of tasks it contains */
322 int impact = std::min(active_execs_, get_core_amount());
324 XBT_DEBUG("set the weight of the dummy CPU action of VM%p on PM to %d (#tasks: %u)", this, impact, active_execs_);
327 action_->set_sharing_penalty(1. / impact);
329 action_->set_sharing_penalty(0.);
331 action_->set_bound(std::min(impact * physical_host_->get_speed(), user_bound_));
335 } // namespace simgrid