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/s4u/Actor.hpp"
9 #include "simgrid/vm.h"
10 #include "src/include/surf/surf.hpp"
11 #include "src/plugins/vm/VirtualMachineImpl.hpp"
12 #include "src/plugins/vm/VmHostExt.hpp"
13 #include "src/surf/cpu_cas01.hpp"
15 XBT_LOG_NEW_DEFAULT_SUBCATEGORY(s4u_vm, s4u, "S4U virtual machines");
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;
27 VirtualMachine::VirtualMachine(const std::string& name, s4u::Host* physical_host, int core_amount)
28 : VirtualMachine(name, physical_host, core_amount, 1024)
32 VirtualMachine::VirtualMachine(const std::string& name, s4u::Host* physical_host, int core_amount, size_t ramsize)
33 : Host(new vm::VirtualMachineImpl(name, this, physical_host, core_amount, ramsize))
34 , pimpl_vm_(dynamic_cast<vm::VirtualMachineImpl*>(Host::get_impl()))
36 XBT_DEBUG("Create VM %s", get_cname());
38 /* Currently, a VM uses the network resource of its physical host */
39 set_netpoint(physical_host->get_netpoint());
41 // Create a VCPU for this VM
42 std::vector<double> speeds;
43 for (int i = 0; i < physical_host->get_pstate_count(); i++)
44 speeds.push_back(physical_host->get_pstate_speed(i));
46 physical_host->get_netpoint()
47 ->get_englobing_zone()
49 ->create_cpu(this, speeds)
50 ->set_core_count(core_amount)
52 if (physical_host->get_pstate() != 0)
53 set_pstate(physical_host->get_pstate());
55 seal(); // seal this host
57 // Real hosts are (only) created through NetZone::create_host(), and this where the on_creation signal is fired.
58 // VMs are created directly, thus firing the signal here. The right solution is probably to separate Host and VM.
59 simgrid::s4u::Host::on_creation(*this);
62 VirtualMachine::~VirtualMachine()
64 on_destruction(*this);
66 XBT_DEBUG("destroy %s", get_cname());
68 /* Don't free these things twice: they are the ones of my physical host */
69 set_netpoint(nullptr);
72 void VirtualMachine::start()
76 kernel::actor::simcall([this]() {
77 vm::VmHostExt::ensureVmExtInstalled();
79 Host* pm = this->pimpl_vm_->get_physical_host();
80 if (pm->extension<vm::VmHostExt>() == nullptr)
81 pm->extension_set(new vm::VmHostExt());
83 long pm_ramsize = pm->extension<vm::VmHostExt>()->ramsize;
84 int pm_overcommit = pm->extension<vm::VmHostExt>()->overcommit;
85 long vm_ramsize = this->get_ramsize();
87 if (pm_ramsize && not pm_overcommit) { /* Only verify that we don't overcommit on need */
88 /* Retrieve the memory occupied by the VMs on that host. Yep, we have to traverse all VMs of all hosts for that */
89 long total_ramsize_of_vms = 0;
90 for (VirtualMachine* const& ws_vm : vm::VirtualMachineImpl::allVms_)
91 if (pm == ws_vm->get_pm())
92 total_ramsize_of_vms += ws_vm->get_ramsize();
94 if (vm_ramsize > pm_ramsize - total_ramsize_of_vms) {
95 XBT_WARN("cannot start %s@%s due to memory shortage: vm_ramsize %ld, free %ld, pm_ramsize %ld (bytes).",
96 this->get_cname(), pm->get_cname(), vm_ramsize, pm_ramsize - total_ramsize_of_vms, pm_ramsize);
97 throw VmFailureException(XBT_THROW_POINT,
98 xbt::string_printf("Memory shortage on host '%s', VM '%s' cannot be started",
99 pm->get_cname(), this->get_cname()));
103 this->pimpl_vm_->set_state(VirtualMachine::state::RUNNING);
109 void VirtualMachine::suspend()
112 kernel::actor::ActorImpl* issuer = kernel::actor::ActorImpl::self();
113 kernel::actor::simcall([this, issuer]() { pimpl_vm_->suspend(issuer); });
116 void VirtualMachine::resume()
122 void VirtualMachine::shutdown()
124 kernel::actor::ActorImpl* issuer = kernel::actor::ActorImpl::self();
125 kernel::actor::simcall([this, issuer]() { pimpl_vm_->shutdown(issuer); });
129 void VirtualMachine::destroy()
131 /* First, terminate all processes on the VM if necessary */
134 /* Then, destroy the VM object */
135 get_impl()->destroy();
139 simgrid::s4u::Host* VirtualMachine::get_pm() const
141 return pimpl_vm_->get_physical_host();
144 VirtualMachine* VirtualMachine::set_pm(simgrid::s4u::Host* pm)
146 kernel::actor::simcall([this, pm]() { pimpl_vm_->set_physical_host(pm); });
150 VirtualMachine::state VirtualMachine::get_state() const
152 return kernel::actor::simcall([this]() { return pimpl_vm_->get_state(); });
155 size_t VirtualMachine::get_ramsize() const
157 return pimpl_vm_->get_ramsize();
160 VirtualMachine* VirtualMachine::set_ramsize(size_t ramsize)
162 pimpl_vm_->set_ramsize(ramsize);
165 /** @brief Set a CPU bound for a given VM.
168 * 1. Note that in some cases MSG_task_set_bound() may not intuitively work for VMs.
171 * On PM0, there are Task1 and VM0.
172 * On VM0, there is Task2.
173 * Now we bound 75% to Task1\@PM0 and bound 25% to Task2\@VM0.
175 * Task1\@PM0 gets 50%.
176 * Task2\@VM0 gets 25%.
177 * This is NOT 75% for Task1\@PM0 and 25% for Task2\@VM0, respectively.
179 * 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
180 * the dummy CPU action. The bound of the dummy CPU action is unlimited.
182 * There are some solutions for this problem. One option is to update the bound of the dummy CPU action automatically.
183 * It should be the sum of all tasks on the VM. But, this solution might be costly, because we have to scan all tasks
184 * on the VM in share_resource() or we have to trap both the start and end of task execution.
186 * The current solution is to use setBound(), which allows us to directly set the bound of the dummy CPU action.
188 * 2. Note that bound == 0 means no bound (i.e., unlimited). But, if a host has multiple CPU cores, the CPU share of a
189 * computation task (or a VM) never exceeds the capacity of a CPU core.
191 VirtualMachine* VirtualMachine::set_bound(double bound)
193 kernel::actor::simcall([this, bound]() { pimpl_vm_->set_bound(bound); });
198 } // namespace simgrid
200 /* **************************** Public C interface *************************** */
202 /** @brief Create a new VM object with the default parameters
203 * A VM is treated as a host. The name of the VM must be unique among all hosts.
205 sg_vm_t sg_vm_create_core(sg_host_t pm, const char* name)
207 return sg_vm_create_multicore(pm, name, 1);
209 /** @brief Create a new VM object with the default parameters, but with a specified amount of cores
210 * A VM is treated as a host. The name of the VM must be unique among all hosts.
212 sg_vm_t sg_vm_create_multicore(sg_host_t pm, const char* name, int coreAmount)
214 return new simgrid::s4u::VirtualMachine(name, pm, coreAmount);
217 const char* sg_vm_get_name(const_sg_vm_t vm)
219 return vm->get_cname();
222 /** @brief Get the physical host of a given VM. */
223 sg_host_t sg_vm_get_pm(const_sg_vm_t vm)
228 void sg_vm_set_ramsize(sg_vm_t vm, size_t size)
230 vm->set_ramsize(size);
233 size_t sg_vm_get_ramsize(const_sg_vm_t vm)
235 return vm->get_ramsize();
238 void sg_vm_set_bound(sg_vm_t vm, double bound)
240 vm->set_bound(bound);
243 /** @brief Returns whether the given VM has just created, not running. */
244 int sg_vm_is_created(const_sg_vm_t vm)
246 return vm->get_state() == simgrid::s4u::VirtualMachine::state::CREATED;
249 /** @brief Returns whether the given VM is currently running */
250 int sg_vm_is_running(const_sg_vm_t vm)
252 return vm->get_state() == simgrid::s4u::VirtualMachine::state::RUNNING;
255 /** @brief Returns whether the given VM is currently suspended, not running. */
256 int sg_vm_is_suspended(const_sg_vm_t vm)
258 return vm->get_state() == simgrid::s4u::VirtualMachine::state::SUSPENDED;
261 /** @brief Start a vm (i.e., boot the guest operating system)
262 * If the VM cannot be started (because of memory over-provisioning), an exception is generated.
264 void sg_vm_start(sg_vm_t vm)
269 /** @brief Immediately suspend the execution of all processes within the given VM.
271 * This function stops the execution of the VM. All the processes on this VM
272 * will pause. The state of the VM is preserved. We can later resume it again.
274 * No suspension cost occurs.
276 void sg_vm_suspend(sg_vm_t vm)
281 /** @brief Resume the execution of the VM. All processes on the VM run again.
282 * No resume cost occurs.
284 void sg_vm_resume(sg_vm_t vm)
289 /** @brief Immediately kills all processes within the given VM.
293 The memory allocated by these actors is leaked, unless you used :cpp:func:`simgrid::s4u::Actor::on_exit`.
297 * No extra delay occurs by default. You may let your actor sleep by a specific amount to simulate any extra delay that
300 void sg_vm_shutdown(sg_vm_t vm)
305 /** @brief Destroy a VM. Destroy the VM object from the simulation. */
306 void sg_vm_destroy(sg_vm_t vm)