1 /* Copyright (c) 2015-2021. 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 <simgrid/Exception.hpp>
7 #include <simgrid/kernel/routing/NetPoint.hpp>
8 #include <simgrid/vm.h>
10 #include "src/plugins/vm/VirtualMachineImpl.hpp"
11 #include "src/plugins/vm/VmHostExt.hpp"
12 #include "src/surf/cpu_cas01.hpp"
14 XBT_LOG_NEW_DEFAULT_SUBCATEGORY(s4u_vm, s4u, "S4U virtual machines");
18 simgrid::xbt::signal<void(VirtualMachine&)> VirtualMachine::on_creation;
19 simgrid::xbt::signal<void(VirtualMachine const&)> VirtualMachine::on_start;
20 simgrid::xbt::signal<void(VirtualMachine const&)> VirtualMachine::on_started;
21 simgrid::xbt::signal<void(VirtualMachine const&)> VirtualMachine::on_shutdown;
22 simgrid::xbt::signal<void(VirtualMachine const&)> VirtualMachine::on_suspend;
23 simgrid::xbt::signal<void(VirtualMachine const&)> VirtualMachine::on_resume;
24 simgrid::xbt::signal<void(VirtualMachine const&)> VirtualMachine::on_migration_start;
25 simgrid::xbt::signal<void(VirtualMachine const&)> VirtualMachine::on_migration_end;
26 simgrid::xbt::signal<void(VirtualMachine const&)> VirtualMachine::on_destruction;
28 VirtualMachine::VirtualMachine(const std::string& name, s4u::Host* physical_host, int core_amount)
29 : VirtualMachine(name, physical_host, core_amount, 1024)
33 VirtualMachine::VirtualMachine(const std::string& name, s4u::Host* physical_host, int core_amount, size_t ramsize)
34 : Host(new vm::VirtualMachineImpl(name, this, physical_host, core_amount, ramsize))
35 , pimpl_vm_(dynamic_cast<vm::VirtualMachineImpl*>(Host::get_impl()))
37 XBT_DEBUG("Create VM %s", get_cname());
39 /* Currently, a VM uses the network resource of its physical host */
40 set_netpoint(physical_host->get_netpoint());
42 // Create a VCPU for this VM
43 std::vector<double> speeds;
44 for (unsigned long i = 0; i < physical_host->get_pstate_count(); i++)
45 speeds.push_back(physical_host->get_pstate_speed(i));
47 physical_host->get_netpoint()
48 ->get_englobing_zone()
50 ->create_cpu(this, speeds)
51 ->set_core_count(core_amount)
54 if (physical_host->get_pstate() != 0)
55 set_pstate(physical_host->get_pstate());
57 seal(); // seal this host
58 s4u::VirtualMachine::on_creation(*this);
61 void VirtualMachine::start()
65 vm::VmHostExt::ensureVmExtInstalled();
67 kernel::actor::simcall([this]() {
68 Host* pm = this->pimpl_vm_->get_physical_host();
69 if (pm->extension<vm::VmHostExt>() == nullptr)
70 pm->extension_set(new vm::VmHostExt());
72 size_t pm_ramsize = pm->extension<vm::VmHostExt>()->ramsize;
73 if (pm_ramsize && not pm->extension<vm::VmHostExt>()->overcommit) { /* Need to verify that we don't overcommit */
74 /* Retrieve the memory occupied by the VMs on that host. Yep, we have to traverse all VMs of all hosts for that */
75 size_t total_ramsize_of_vms = 0;
76 for (VirtualMachine* const& ws_vm : vm::VirtualMachineImpl::allVms_)
77 if (pm == ws_vm->get_pm())
78 total_ramsize_of_vms += ws_vm->get_ramsize();
80 if (total_ramsize_of_vms + get_ramsize() > pm_ramsize) {
81 XBT_WARN("cannot start %s@%s due to memory shortage: get_ramsize() %zu, free %zu, pm_ramsize %zu (bytes).",
82 get_cname(), pm->get_cname(), get_ramsize(), pm_ramsize - total_ramsize_of_vms, pm_ramsize);
83 throw VmFailureException(XBT_THROW_POINT,
84 xbt::string_printf("Memory shortage on host '%s', VM '%s' cannot be started",
85 pm->get_cname(), get_cname()));
88 this->pimpl_vm_->set_state(State::RUNNING);
94 void VirtualMachine::suspend()
97 kernel::actor::ActorImpl* issuer = kernel::actor::ActorImpl::self();
98 kernel::actor::simcall([this, issuer]() { pimpl_vm_->suspend(issuer); });
101 void VirtualMachine::resume()
107 void VirtualMachine::shutdown()
109 kernel::actor::ActorImpl* issuer = kernel::actor::ActorImpl::self();
110 kernel::actor::simcall([this, issuer]() { pimpl_vm_->shutdown(issuer); });
114 void VirtualMachine::destroy()
116 auto destroy_code = [this]() {
117 /* First, terminate all processes on the VM if necessary */
120 XBT_DEBUG("destroy %s", get_cname());
122 /* Then, destroy the VM object */
123 kernel::actor::simcall([this]() {
124 get_vm_impl()->vm_destroy();
125 get_impl()->destroy();
127 /* Don't free these things twice: they are the ones of my physical host */
128 set_netpoint(nullptr);
133 if (not this_actor::is_maestro() && this_actor::get_host() == this) {
134 XBT_VERB("Launch another actor on physical host %s to destroy my own VM: %s", get_pm()->get_cname(), get_cname());
135 simgrid::s4u::Actor::create(get_cname() + std::string("-vm_destroy"), get_pm(), destroy_code);
136 simgrid::s4u::this_actor::yield();
137 XBT_CRITICAL("I should be dead now!");
144 simgrid::s4u::Host* VirtualMachine::get_pm() const
146 return pimpl_vm_->get_physical_host();
149 VirtualMachine* VirtualMachine::set_pm(simgrid::s4u::Host* pm)
151 kernel::actor::simcall([this, pm]() { pimpl_vm_->set_physical_host(pm); });
155 VirtualMachine::State VirtualMachine::get_state() const
157 return kernel::actor::simcall([this]() { return pimpl_vm_->get_state(); });
160 size_t VirtualMachine::get_ramsize() const
162 return pimpl_vm_->get_ramsize();
165 VirtualMachine* VirtualMachine::set_ramsize(size_t ramsize)
167 pimpl_vm_->set_ramsize(ramsize);
170 /** @brief Set a CPU bound for a given VM.
173 * 1. Note that in some cases MSG_task_set_bound() may not intuitively work for VMs.
176 * On PM0, there are Task1 and VM0.
177 * On VM0, there is Task2.
178 * Now we bound 75% to Task1\@PM0 and bound 25% to Task2\@VM0.
180 * Task1\@PM0 gets 50%.
181 * Task2\@VM0 gets 25%.
182 * This is NOT 75% for Task1\@PM0 and 25% for Task2\@VM0, respectively.
184 * This is because a VM has the dummy CPU action in the PM layer. Putting a task on the VM does not affect the bound of
185 * the dummy CPU action. The bound of the dummy CPU action is unlimited.
187 * There are some solutions for this problem. One option is to update the bound of the dummy CPU action automatically.
188 * It should be the sum of all tasks on the VM. But, this solution might be costly, because we have to scan all tasks
189 * on the VM in share_resource() or we have to trap both the start and end of task execution.
191 * The current solution is to use setBound(), which allows us to directly set the bound of the dummy CPU action.
193 * 2. Note that bound == 0 means no bound (i.e., unlimited). But, if a host has multiple CPU cores, the CPU share of a
194 * computation task (or a VM) never exceeds the capacity of a CPU core.
196 VirtualMachine* VirtualMachine::set_bound(double bound)
198 kernel::actor::simcall([this, bound]() { pimpl_vm_->set_bound(bound); });
203 } // namespace simgrid
205 /* **************************** Public C interface *************************** */
207 /** @brief Create a new VM object with the default parameters
208 * A VM is treated as a host. The name of the VM must be unique among all hosts.
210 sg_vm_t sg_vm_create_core(sg_host_t pm, const char* name)
212 return sg_vm_create_multicore(pm, name, 1);
214 /** @brief Create a new VM object with the default parameters, but with a specified amount of cores
215 * A VM is treated as a host. The name of the VM must be unique among all hosts.
217 sg_vm_t sg_vm_create_multicore(sg_host_t pm, const char* name, int coreAmount)
219 return new simgrid::s4u::VirtualMachine(name, pm, coreAmount);
222 const char* sg_vm_get_name(const_sg_vm_t vm)
224 return vm->get_cname();
227 /** @brief Get the physical host of a given VM. */
228 sg_host_t sg_vm_get_pm(const_sg_vm_t vm)
233 void sg_vm_set_ramsize(sg_vm_t vm, size_t size)
235 vm->set_ramsize(size);
238 size_t sg_vm_get_ramsize(const_sg_vm_t vm)
240 return vm->get_ramsize();
243 void sg_vm_set_bound(sg_vm_t vm, double bound)
245 vm->set_bound(bound);
248 /** @brief Returns whether the given VM has just created, not running. */
249 int sg_vm_is_created(const_sg_vm_t vm)
251 return vm->get_state() == simgrid::s4u::VirtualMachine::State::CREATED;
254 /** @brief Returns whether the given VM is currently running */
255 int sg_vm_is_running(const_sg_vm_t vm)
257 return vm->get_state() == simgrid::s4u::VirtualMachine::State::RUNNING;
260 /** @brief Returns whether the given VM is currently suspended, not running. */
261 int sg_vm_is_suspended(const_sg_vm_t vm)
263 return vm->get_state() == simgrid::s4u::VirtualMachine::State::SUSPENDED;
266 /** @brief Start a vm (i.e., boot the guest operating system)
267 * If the VM cannot be started (because of memory over-provisioning), an exception is generated.
269 void sg_vm_start(sg_vm_t vm)
274 /** @brief Immediately suspend the execution of all processes within the given VM.
276 * This function stops the execution of the VM. All the processes on this VM
277 * will pause. The state of the VM is preserved. We can later resume it again.
279 * No suspension cost occurs.
281 void sg_vm_suspend(sg_vm_t vm)
286 /** @brief Resume the execution of the VM. All processes on the VM run again.
287 * No resume cost occurs.
289 void sg_vm_resume(sg_vm_t vm)
294 /** @brief Immediately kills all processes within the given VM.
298 The memory allocated by these actors is leaked, unless you used :cpp:func:`simgrid::s4u::Actor::on_exit`.
302 * No extra delay occurs by default. You may let your actor sleep by a specific amount to simulate any extra delay that
305 void sg_vm_shutdown(sg_vm_t vm)
310 /** @brief Destroy a VM. Destroy the VM object from the simulation. */
311 void sg_vm_destroy(sg_vm_t vm)