1 /* Copyright (c) 2013-2022. 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 <simgrid/Exception.hpp>
7 #include <simgrid/kernel/routing/NetZoneImpl.hpp>
8 #include <simgrid/s4u/Exec.hpp>
10 #include "simgrid/sg_config.hpp"
11 #include "src/kernel/EngineImpl.hpp"
12 #include "src/kernel/activity/ExecImpl.hpp"
13 #include "src/kernel/resource/VirtualMachineImpl.hpp"
14 #include "src/surf/cpu_cas01.hpp"
15 #include "src/surf/cpu_ti.hpp"
19 XBT_LOG_NEW_DEFAULT_SUBCATEGORY(res_vm, ker_resource, "Virtual Machines, containing actors and mobile across hosts");
21 void surf_vm_model_init_HL13(simgrid::kernel::resource::CpuModel* cpu_pm_model)
23 auto vm_model = std::make_shared<simgrid::kernel::resource::VMModel>("VM_HL13");
24 auto* engine = simgrid::kernel::EngineImpl::get_instance();
26 engine->add_model(vm_model, {cpu_pm_model});
27 std::shared_ptr<simgrid::kernel::resource::CpuModel> cpu_model_vm;
29 auto cpu_optim = simgrid::config::get_value<std::string>("cpu/optim");
30 if (cpu_optim == "TI") {
31 cpu_model_vm = std::make_shared<simgrid::kernel::resource::CpuTiModel>("VmCpu_TI");
33 cpu_model_vm = std::make_shared<simgrid::kernel::resource::CpuCas01Model>("VmCpu_Cas01");
35 engine->add_model(cpu_model_vm, {cpu_pm_model, vm_model.get()});
36 engine->get_netzone_root()->set_cpu_vm_model(cpu_model_vm);
40 template class xbt::Extendable<kernel::resource::VirtualMachineImpl>;
49 std::deque<s4u::VirtualMachine*> VirtualMachineImpl::allVms_;
51 /* In the real world, processes on the guest operating system will be somewhat degraded due to virtualization overhead.
52 * The total CPU share these processes get is smaller than that of the VM process gets on a host operating system.
53 * FIXME: add a configuration flag for this
55 const double virt_overhead = 1; // 0.95
57 static void host_state_change(s4u::Host const& host)
59 if (not host.is_on()) { // just turned off.
60 std::vector<s4u::VirtualMachine*> trash;
61 /* Find all VMs living on that host */
62 for (s4u::VirtualMachine* const& vm : VirtualMachineImpl::allVms_)
63 if (vm->get_pm() == &host)
65 for (s4u::VirtualMachine* vm : trash)
70 static void add_active_exec(s4u::Exec const& task)
72 const s4u::VirtualMachine* vm = dynamic_cast<s4u::VirtualMachine*>(task.get_host());
74 VirtualMachineImpl* vm_impl = vm->get_vm_impl();
75 vm_impl->add_active_exec();
76 vm_impl->update_action_weight();
80 static void remove_active_exec(s4u::Activity const& task)
82 const auto* exec = dynamic_cast<s4u::Exec const*>(&task);
85 if (not exec->is_assigned())
87 const s4u::VirtualMachine* vm = dynamic_cast<s4u::VirtualMachine*>(exec->get_host());
89 VirtualMachineImpl* vm_impl = vm->get_vm_impl();
90 vm_impl->remove_active_exec();
91 vm_impl->update_action_weight();
95 static s4u::VirtualMachine* get_vm_from_activity(kernel::activity::ActivityImpl const& act)
97 auto* exec = dynamic_cast<kernel::activity::ExecImpl const*>(&act);
98 return exec != nullptr ? dynamic_cast<s4u::VirtualMachine*>(exec->get_host()) : nullptr;
101 static void add_active_activity(kernel::activity::ActivityImpl const& act)
103 const s4u::VirtualMachine* vm = get_vm_from_activity(act);
105 VirtualMachineImpl* vm_impl = vm->get_vm_impl();
106 vm_impl->add_active_exec();
107 vm_impl->update_action_weight();
111 static void remove_active_activity(kernel::activity::ActivityImpl const& act)
113 const s4u::VirtualMachine* vm = get_vm_from_activity(act);
115 VirtualMachineImpl* vm_impl = vm->get_vm_impl();
116 vm_impl->remove_active_exec();
117 vm_impl->update_action_weight();
121 VMModel::VMModel(const std::string& name) : HostModel(name)
123 s4u::Host::on_state_change_cb(host_state_change);
124 s4u::Exec::on_start_cb(add_active_exec);
125 s4u::Activity::on_completion_cb(remove_active_exec);
126 activity::ActivityImpl::on_resumed.connect(add_active_activity);
127 activity::ActivityImpl::on_suspended.connect(remove_active_activity);
130 double VMModel::next_occurring_event(double now)
132 /* TODO: update action's cost with the total cost of processes on the VM. */
134 /* 1. Now we know how many resource should be assigned to each virtual
135 * machine. We update constraints of the virtual machine layer.
137 * If we have two virtual machine (VM1 and VM2) on a physical machine (PM1).
138 * X1 + X2 = C (Equation 1)
140 * the resource share of VM1: X1
141 * the resource share of VM2: X2
142 * the capacity of PM1: C
144 * Then, if we have two process (P1 and P2) on VM1.
145 * X1_1 + X1_2 = X1 (Equation 2)
147 * the resource share of P1: X1_1
148 * the resource share of P2: X1_2
149 * the capacity of VM1: X1
151 * Equation 1 was solved in the physical machine layer.
152 * Equation 2 is solved in the virtual machine layer (here).
153 * X1 must be passed to the virtual machine layer as a constraint value.
156 /* iterate for all virtual machines */
157 for (s4u::VirtualMachine* const& ws_vm : VirtualMachineImpl::allVms_) {
158 if (ws_vm->get_state() == s4u::VirtualMachine::State::SUSPENDED) // Ignore suspended VMs
161 const kernel::resource::CpuImpl* cpu = ws_vm->get_cpu();
163 // solved_value below is X1 in comment above: what this VM got in the sharing on the PM
164 double solved_value = ws_vm->get_vm_impl()->get_action()->get_rate();
165 XBT_DEBUG("assign %f to vm %s @ pm %s", solved_value, ws_vm->get_cname(), ws_vm->get_pm()->get_cname());
167 lmm::System* vcpu_system = cpu->get_model()->get_maxmin_system();
168 vcpu_system->update_constraint_bound(cpu->get_constraint(), virt_overhead * solved_value);
170 /* actual next occurring event is determined by VM CPU model at EngineImpl::solve */
174 Action* VMModel::execute_thread(const s4u::Host* host, double flops_amount, int thread_count)
176 auto cpu = host->get_cpu();
177 return cpu->execution_start(thread_count * flops_amount, thread_count, -1);
184 VirtualMachineImpl::VirtualMachineImpl(const std::string& name, s4u::VirtualMachine* piface,
185 simgrid::s4u::Host* host_PM, int core_amount, size_t ramsize)
186 : HostImpl(name, piface), piface_(piface), physical_host_(host_PM), core_amount_(core_amount), ramsize_(ramsize)
188 /* Register this VM to the list of all VMs */
189 allVms_.push_back(piface);
190 /* We create cpu_action corresponding to a VM process on the host operating system. */
191 /* TODO: we have to periodically input GUESTOS_NOISE to the system? how ?
192 * The value for GUESTOS_NOISE corresponds to the cost of the global action associated to the VM. It corresponds to
193 * the cost of a VM running no tasks.
195 action_ = physical_host_->get_cpu()->execution_start(0, core_amount_, 0);
197 // It's empty for now, so it should not request resources in the PM
198 update_action_weight();
200 XBT_VERB("Create VM(%s)@PM(%s)", name.c_str(), physical_host_->get_cname());
203 /** @brief A physical host does not disappear in the current SimGrid code, but a VM may disappear during a simulation */
204 void VirtualMachineImpl::vm_destroy()
206 /* I was already removed from the allVms set if the VM was destroyed cleanly */
207 auto iter = find(allVms_.begin(), allVms_.end(), piface_);
208 if (iter != allVms_.end())
211 /* Free the cpu_action of the VM. */
212 XBT_ATTRIB_UNUSED bool ret = action_->unref();
213 xbt_assert(ret, "Bug: some resource still remains");
216 void VirtualMachineImpl::suspend(const actor::ActorImpl* issuer)
218 if (vm_state_ != s4u::VirtualMachine::State::RUNNING)
219 throw VmFailureException(XBT_THROW_POINT,
220 xbt::string_printf("Cannot suspend VM %s: it is not running.", piface_->get_cname()));
221 if (issuer->get_host() == piface_)
222 throw VmFailureException(XBT_THROW_POINT, xbt::string_printf("Actor %s cannot suspend the VM %s in which it runs",
223 issuer->get_cname(), piface_->get_cname()));
225 XBT_DEBUG("suspend VM(%s), where %zu actors exist", piface_->get_cname(), get_actor_count());
229 foreach_actor([](auto& actor) {
230 XBT_DEBUG("suspend %s", actor.get_cname());
234 XBT_DEBUG("suspend all actors on the VM done done");
236 vm_state_ = s4u::VirtualMachine::State::SUSPENDED;
239 void VirtualMachineImpl::resume()
241 if (vm_state_ != s4u::VirtualMachine::State::SUSPENDED)
242 throw VmFailureException(XBT_THROW_POINT,
243 xbt::string_printf("Cannot resume VM %s: it was not suspended", piface_->get_cname()));
245 XBT_DEBUG("Resume VM %s, containing %zu actors.", piface_->get_cname(), get_actor_count());
249 foreach_actor([](auto& actor) {
250 XBT_DEBUG("resume %s", actor.get_cname());
254 vm_state_ = s4u::VirtualMachine::State::RUNNING;
257 /** @brief Power off a VM.
259 * All hosted processes will be killed, but the VM state is preserved on memory.
260 * It can later be restarted.
262 * @param issuer the actor requesting the shutdown
264 void VirtualMachineImpl::shutdown(actor::ActorImpl* issuer)
266 if (vm_state_ != s4u::VirtualMachine::State::RUNNING)
267 XBT_VERB("Shutting down the VM %s even if it's not running but in state %s", piface_->get_cname(),
268 s4u::VirtualMachine::to_c_str(get_state()));
270 XBT_DEBUG("shutdown VM %s, that contains %zu actors", piface_->get_cname(), get_actor_count());
272 foreach_actor([issuer](auto& actor) {
273 XBT_DEBUG("kill %s@%s on behalf of %s which shutdown that VM.", actor.get_cname(), actor.get_host()->get_cname(),
274 issuer->get_cname());
275 issuer->kill(&actor);
278 set_state(s4u::VirtualMachine::State::DESTROYED);
280 /* FIXME: we may have to do something at the surf layer, e.g., vcpu action */
283 /** @brief Change the physical host on which the given VM is running
285 * This is an instantaneous migration.
287 void VirtualMachineImpl::set_physical_host(s4u::Host* destination)
289 std::string vm_name = piface_->get_name();
290 std::string pm_name_src = physical_host_->get_name();
291 std::string pm_name_dst = destination->get_name();
293 /* update net_elm with that of the destination physical host */
294 piface_->set_netpoint(destination->get_netpoint());
296 /* Adapt the speed, pstate and other physical characteristics to the one of our new physical CPU */
297 piface_->get_cpu()->reset_vcpu(destination->get_cpu());
299 physical_host_ = destination;
301 /* Update vcpu's action for the new pm */
302 /* create a cpu action bound to the pm model at the destination. */
303 CpuAction* new_cpu_action = destination->get_cpu()->execution_start(0, this->core_amount_);
305 if (action_->get_remains_no_update() > 0)
306 XBT_CRITICAL("FIXME: need copy the state(?), %f", action_->get_remains_no_update());
308 /* keep the bound value of the cpu action of the VM. */
309 double old_bound = action_->get_bound();
311 XBT_DEBUG("migrate VM(%s): set bound (%f) at %s", vm_name.c_str(), old_bound, pm_name_dst.c_str());
312 new_cpu_action->set_bound(old_bound);
315 XBT_ATTRIB_UNUSED bool ret = action_->unref();
316 xbt_assert(ret, "Bug: some resource still remains");
318 action_ = new_cpu_action;
320 XBT_DEBUG("migrate VM(%s): change PM (%s to %s)", vm_name.c_str(), pm_name_src.c_str(), pm_name_dst.c_str());
323 void VirtualMachineImpl::set_bound(double bound)
326 action_->set_user_bound(user_bound_);
327 update_action_weight();
330 void VirtualMachineImpl::update_action_weight()
332 /* The impact of the VM over its PM is the min between its vCPU amount and the amount of tasks it contains */
333 int impact = std::min(active_execs_, get_core_amount());
335 XBT_DEBUG("set the weight of the dummy CPU action of VM%p on PM to %d (#tasks: %u)", this, impact, active_execs_);
338 action_->set_sharing_penalty(1. / impact);
340 action_->set_sharing_penalty(0.);
342 action_->set_bound(std::min(impact * physical_host_->get_speed(), user_bound_));
345 } // namespace resource
346 } // namespace kernel
347 } // namespace simgrid