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/kernel/resource/VirtualMachineImpl.hpp"
11 #include "src/surf/cpu_cas01.hpp"
13 XBT_LOG_NEW_DEFAULT_SUBCATEGORY(s4u_vm, s4u, "S4U virtual machines");
17 xbt::signal<void(VirtualMachine&)> VirtualMachine::on_creation;
18 xbt::signal<void(VirtualMachine const&)> VirtualMachine::on_start;
19 xbt::signal<void(VirtualMachine const&)> VirtualMachine::on_started;
20 xbt::signal<void(VirtualMachine const&)> VirtualMachine::on_shutdown;
21 xbt::signal<void(VirtualMachine const&)> VirtualMachine::on_suspend;
22 xbt::signal<void(VirtualMachine const&)> VirtualMachine::on_resume;
23 xbt::signal<void(VirtualMachine const&)> VirtualMachine::on_migration_start;
24 xbt::signal<void(VirtualMachine const&)> VirtualMachine::on_migration_end;
25 xbt::signal<void(VirtualMachine const&)> VirtualMachine::on_destruction;
27 xbt::Extension<Host, VmHostExt> VmHostExt::EXTENSION_ID;
29 void VmHostExt::ensureVmExtInstalled()
31 if (not EXTENSION_ID.valid())
32 EXTENSION_ID = Host::extension_create<VmHostExt>();
35 VirtualMachine::VirtualMachine(const std::string& name, s4u::Host* physical_host, int core_amount)
36 : VirtualMachine(name, physical_host, core_amount, 1024)
40 VirtualMachine::VirtualMachine(const std::string& name, s4u::Host* physical_host, int core_amount, size_t ramsize)
41 : Host(new kernel::resource::VirtualMachineImpl(name, this, physical_host, core_amount, ramsize))
42 , pimpl_vm_(dynamic_cast<kernel::resource::VirtualMachineImpl*>(Host::get_impl()))
44 XBT_DEBUG("Create VM %s", get_cname());
46 /* Currently, a VM uses the network resource of its physical host */
47 set_netpoint(physical_host->get_netpoint());
49 // Create a VCPU for this VM
50 std::vector<double> speeds;
51 for (unsigned long i = 0; i < physical_host->get_pstate_count(); i++)
52 speeds.push_back(physical_host->get_pstate_speed(i));
54 physical_host->get_netpoint()
55 ->get_englobing_zone()
57 ->create_cpu(this, speeds)
58 ->set_core_count(core_amount)
61 if (physical_host->get_pstate() != 0)
62 set_pstate(physical_host->get_pstate());
64 seal(); // seal this host
65 s4u::VirtualMachine::on_creation(*this);
68 void VirtualMachine::start()
72 VmHostExt::ensureVmExtInstalled();
74 kernel::actor::simcall([this]() {
75 Host* pm = this->pimpl_vm_->get_physical_host();
76 if (pm->extension<VmHostExt>() == nullptr)
77 pm->extension_set(new VmHostExt());
79 size_t pm_ramsize = pm->extension<VmHostExt>()->ramsize;
80 if (pm_ramsize && not pm->extension<VmHostExt>()->overcommit) { /* Need to verify that we don't overcommit */
81 /* Retrieve the memory occupied by the VMs on that host. Yep, we have to traverse all VMs of all hosts for that */
82 size_t total_ramsize_of_vms = 0;
83 for (VirtualMachine* const& ws_vm : kernel::resource::VirtualMachineImpl::allVms_)
84 if (pm == ws_vm->get_pm())
85 total_ramsize_of_vms += ws_vm->get_ramsize();
87 if (total_ramsize_of_vms + get_ramsize() > pm_ramsize) {
88 XBT_WARN("cannot start %s@%s due to memory shortage: get_ramsize() %zu, free %zu, pm_ramsize %zu (bytes).",
89 get_cname(), pm->get_cname(), get_ramsize(), pm_ramsize - total_ramsize_of_vms, pm_ramsize);
90 throw VmFailureException(XBT_THROW_POINT,
91 xbt::string_printf("Memory shortage on host '%s', VM '%s' cannot be started",
92 pm->get_cname(), get_cname()));
95 this->pimpl_vm_->set_state(State::RUNNING);
101 void VirtualMachine::suspend()
104 kernel::actor::ActorImpl* issuer = kernel::actor::ActorImpl::self();
105 kernel::actor::simcall([this, issuer]() { pimpl_vm_->suspend(issuer); });
108 void VirtualMachine::resume()
114 void VirtualMachine::shutdown()
116 kernel::actor::ActorImpl* issuer = kernel::actor::ActorImpl::self();
117 kernel::actor::simcall([this, issuer]() { pimpl_vm_->shutdown(issuer); });
121 void VirtualMachine::destroy()
123 auto destroy_code = [this]() {
124 /* First, terminate all processes on the VM if necessary */
127 XBT_DEBUG("destroy %s", get_cname());
129 /* Then, destroy the VM object */
130 kernel::actor::simcall([this]() {
131 get_vm_impl()->vm_destroy();
132 get_impl()->destroy();
134 /* Don't free these things twice: they are the ones of my physical host */
135 set_netpoint(nullptr);
140 if (not this_actor::is_maestro() && this_actor::get_host() == this) {
141 XBT_VERB("Launch another actor on physical host %s to destroy my own VM: %s", get_pm()->get_cname(), get_cname());
142 simgrid::s4u::Actor::create(get_cname() + std::string("-vm_destroy"), get_pm(), destroy_code);
143 simgrid::s4u::this_actor::yield();
144 XBT_CRITICAL("I should be dead now!");
151 simgrid::s4u::Host* VirtualMachine::get_pm() const
153 return pimpl_vm_->get_physical_host();
156 VirtualMachine* VirtualMachine::set_pm(simgrid::s4u::Host* pm)
158 kernel::actor::simcall([this, pm]() { pimpl_vm_->set_physical_host(pm); });
162 VirtualMachine::State VirtualMachine::get_state() const
164 return kernel::actor::simcall([this]() { return pimpl_vm_->get_state(); });
167 size_t VirtualMachine::get_ramsize() const
169 return pimpl_vm_->get_ramsize();
172 VirtualMachine* VirtualMachine::set_ramsize(size_t ramsize)
174 pimpl_vm_->set_ramsize(ramsize);
177 /** @brief Set a CPU bound for a given VM.
180 * 1. Note that in some cases MSG_task_set_bound() may not intuitively work for VMs.
183 * On PM0, there are Task1 and VM0.
184 * On VM0, there is Task2.
185 * Now we bound 75% to Task1\@PM0 and bound 25% to Task2\@VM0.
187 * Task1\@PM0 gets 50%.
188 * Task2\@VM0 gets 25%.
189 * This is NOT 75% for Task1\@PM0 and 25% for Task2\@VM0, respectively.
191 * 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
192 * the dummy CPU action. The bound of the dummy CPU action is unlimited.
194 * There are some solutions for this problem. One option is to update the bound of the dummy CPU action automatically.
195 * It should be the sum of all tasks on the VM. But, this solution might be costly, because we have to scan all tasks
196 * on the VM in share_resource() or we have to trap both the start and end of task execution.
198 * The current solution is to use setBound(), which allows us to directly set the bound of the dummy CPU action.
200 * 2. Note that bound == 0 means no bound (i.e., unlimited). But, if a host has multiple CPU cores, the CPU share of a
201 * computation task (or a VM) never exceeds the capacity of a CPU core.
203 VirtualMachine* VirtualMachine::set_bound(double bound)
205 kernel::actor::simcall([this, bound]() { pimpl_vm_->set_bound(bound); });
210 } // namespace simgrid
212 /* **************************** Public C interface *************************** */
214 /** @brief Create a new VM object with the default parameters
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_core(sg_host_t pm, const char* name)
219 return sg_vm_create_multicore(pm, name, 1);
221 /** @brief Create a new VM object with the default parameters, but with a specified amount of cores
222 * A VM is treated as a host. The name of the VM must be unique among all hosts.
224 sg_vm_t sg_vm_create_multicore(sg_host_t pm, const char* name, int coreAmount)
226 return pm->create_vm(name, coreAmount);
229 const char* sg_vm_get_name(const_sg_vm_t vm)
231 return vm->get_cname();
234 /** @brief Get the physical host of a given VM. */
235 sg_host_t sg_vm_get_pm(const_sg_vm_t vm)
240 void sg_vm_set_ramsize(sg_vm_t vm, size_t size)
242 vm->set_ramsize(size);
245 size_t sg_vm_get_ramsize(const_sg_vm_t vm)
247 return vm->get_ramsize();
250 void sg_vm_set_bound(sg_vm_t vm, double bound)
252 vm->set_bound(bound);
255 /** @brief Returns whether the given VM has just created, not running. */
256 int sg_vm_is_created(const_sg_vm_t vm)
258 return vm->get_state() == simgrid::s4u::VirtualMachine::State::CREATED;
261 /** @brief Returns whether the given VM is currently running */
262 int sg_vm_is_running(const_sg_vm_t vm)
264 return vm->get_state() == simgrid::s4u::VirtualMachine::State::RUNNING;
267 /** @brief Returns whether the given VM is currently suspended, not running. */
268 int sg_vm_is_suspended(const_sg_vm_t vm)
270 return vm->get_state() == simgrid::s4u::VirtualMachine::State::SUSPENDED;
273 /** @brief Start a vm (i.e., boot the guest operating system)
274 * If the VM cannot be started (because of memory over-provisioning), an exception is generated.
276 void sg_vm_start(sg_vm_t vm)
281 /** @brief Immediately suspend the execution of all processes within the given VM.
283 * This function stops the execution of the VM. All the processes on this VM
284 * will pause. The state of the VM is preserved. We can later resume it again.
286 * No suspension cost occurs.
288 void sg_vm_suspend(sg_vm_t vm)
293 /** @brief Resume the execution of the VM. All processes on the VM run again.
294 * No resume cost occurs.
296 void sg_vm_resume(sg_vm_t vm)
301 /** @brief Immediately kills all processes within the given VM.
305 The memory allocated by these actors is leaked, unless you used :cpp:func:`simgrid::s4u::Actor::on_exit`.
309 * No extra delay occurs by default. You may let your actor sleep by a specific amount to simulate any extra delay that
312 void sg_vm_shutdown(sg_vm_t vm)
317 /** @brief Destroy a VM. Destroy the VM object from the simulation. */
318 void sg_vm_destroy(sg_vm_t vm)