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(name, 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 // Real hosts are (only) created through NetZone::create_host(), and this where the on_creation signal is fired.
56 // VMs are created directly, thus firing the signal here. The right solution is probably to separate Host and VM.
57 simgrid::s4u::Host::on_creation(*this);
60 VirtualMachine::~VirtualMachine()
62 on_destruction(*this);
64 XBT_DEBUG("destroy %s", get_cname());
66 /* Don't free these things twice: they are the ones of my physical host */
67 set_netpoint(nullptr);
70 void VirtualMachine::start()
74 kernel::actor::simcall([this]() {
75 vm::VmHostExt::ensureVmExtInstalled();
77 Host* pm = this->pimpl_vm_->get_physical_host();
78 if (pm->extension<vm::VmHostExt>() == nullptr)
79 pm->extension_set(new vm::VmHostExt());
81 long pm_ramsize = pm->extension<vm::VmHostExt>()->ramsize;
82 int pm_overcommit = pm->extension<vm::VmHostExt>()->overcommit;
83 long vm_ramsize = this->get_ramsize();
85 if (pm_ramsize && not pm_overcommit) { /* Only verify that we don't overcommit on need */
86 /* Retrieve the memory occupied by the VMs on that host. Yep, we have to traverse all VMs of all hosts for that */
87 long total_ramsize_of_vms = 0;
88 for (VirtualMachine* const& ws_vm : vm::VirtualMachineImpl::allVms_)
89 if (pm == ws_vm->get_pm())
90 total_ramsize_of_vms += ws_vm->get_ramsize();
92 if (vm_ramsize > pm_ramsize - total_ramsize_of_vms) {
93 XBT_WARN("cannot start %s@%s due to memory shortage: vm_ramsize %ld, free %ld, pm_ramsize %ld (bytes).",
94 this->get_cname(), pm->get_cname(), vm_ramsize, pm_ramsize - total_ramsize_of_vms, pm_ramsize);
95 throw VmFailureException(XBT_THROW_POINT,
96 xbt::string_printf("Memory shortage on host '%s', VM '%s' cannot be started",
97 pm->get_cname(), this->get_cname()));
101 this->pimpl_vm_->set_state(VirtualMachine::state::RUNNING);
107 void VirtualMachine::suspend()
110 kernel::actor::ActorImpl* issuer = kernel::actor::ActorImpl::self();
111 kernel::actor::simcall([this, issuer]() { pimpl_vm_->suspend(issuer); });
114 void VirtualMachine::resume()
120 void VirtualMachine::shutdown()
122 kernel::actor::ActorImpl* issuer = kernel::actor::ActorImpl::self();
123 kernel::actor::simcall([this, issuer]() { pimpl_vm_->shutdown(issuer); });
127 void VirtualMachine::destroy()
129 /* First, terminate all processes on the VM if necessary */
132 /* Then, destroy the VM object */
133 get_impl()->destroy();
137 simgrid::s4u::Host* VirtualMachine::get_pm() const
139 return pimpl_vm_->get_physical_host();
142 VirtualMachine* VirtualMachine::set_pm(simgrid::s4u::Host* pm)
144 kernel::actor::simcall([this, pm]() { pimpl_vm_->set_physical_host(pm); });
148 VirtualMachine::state VirtualMachine::get_state() const
150 return kernel::actor::simcall([this]() { return pimpl_vm_->get_state(); });
153 size_t VirtualMachine::get_ramsize() const
155 return pimpl_vm_->get_ramsize();
158 VirtualMachine* VirtualMachine::set_ramsize(size_t ramsize)
160 pimpl_vm_->set_ramsize(ramsize);
163 /** @brief Set a CPU bound for a given VM.
166 * 1. Note that in some cases MSG_task_set_bound() may not intuitively work for VMs.
169 * On PM0, there are Task1 and VM0.
170 * On VM0, there is Task2.
171 * Now we bound 75% to Task1\@PM0 and bound 25% to Task2\@VM0.
173 * Task1\@PM0 gets 50%.
174 * Task2\@VM0 gets 25%.
175 * This is NOT 75% for Task1\@PM0 and 25% for Task2\@VM0, respectively.
177 * 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
178 * the dummy CPU action. The bound of the dummy CPU action is unlimited.
180 * There are some solutions for this problem. One option is to update the bound of the dummy CPU action automatically.
181 * It should be the sum of all tasks on the VM. But, this solution might be costly, because we have to scan all tasks
182 * on the VM in share_resource() or we have to trap both the start and end of task execution.
184 * The current solution is to use setBound(), which allows us to directly set the bound of the dummy CPU action.
186 * 2. Note that bound == 0 means no bound (i.e., unlimited). But, if a host has multiple CPU cores, the CPU share of a
187 * computation task (or a VM) never exceeds the capacity of a CPU core.
189 VirtualMachine* VirtualMachine::set_bound(double bound)
191 kernel::actor::simcall([this, bound]() { pimpl_vm_->set_bound(bound); });
196 } // namespace simgrid
198 /* **************************** Public C interface *************************** */
200 /** @brief Create a new VM object with the default parameters
201 * A VM is treated as a host. The name of the VM must be unique among all hosts.
203 sg_vm_t sg_vm_create_core(sg_host_t pm, const char* name)
205 return sg_vm_create_multicore(pm, name, 1);
207 /** @brief Create a new VM object with the default parameters, but with a specified amount of cores
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_multicore(sg_host_t pm, const char* name, int coreAmount)
212 return new simgrid::s4u::VirtualMachine(name, pm, coreAmount);
215 const char* sg_vm_get_name(const_sg_vm_t vm)
217 return vm->get_cname();
220 /** @brief Get the physical host of a given VM. */
221 sg_host_t sg_vm_get_pm(const_sg_vm_t vm)
226 void sg_vm_set_ramsize(sg_vm_t vm, size_t size)
228 vm->set_ramsize(size);
231 size_t sg_vm_get_ramsize(const_sg_vm_t vm)
233 return vm->get_ramsize();
236 void sg_vm_set_bound(sg_vm_t vm, double bound)
238 vm->set_bound(bound);
241 /** @brief Returns whether the given VM has just created, not running. */
242 int sg_vm_is_created(const_sg_vm_t vm)
244 return vm->get_state() == simgrid::s4u::VirtualMachine::state::CREATED;
247 /** @brief Returns whether the given VM is currently running */
248 int sg_vm_is_running(const_sg_vm_t vm)
250 return vm->get_state() == simgrid::s4u::VirtualMachine::state::RUNNING;
253 /** @brief Returns whether the given VM is currently suspended, not running. */
254 int sg_vm_is_suspended(const_sg_vm_t vm)
256 return vm->get_state() == simgrid::s4u::VirtualMachine::state::SUSPENDED;
259 /** @brief Start a vm (i.e., boot the guest operating system)
260 * If the VM cannot be started (because of memory over-provisioning), an exception is generated.
262 void sg_vm_start(sg_vm_t vm)
267 /** @brief Immediately suspend the execution of all processes within the given VM.
269 * This function stops the execution of the VM. All the processes on this VM
270 * will pause. The state of the VM is preserved. We can later resume it again.
272 * No suspension cost occurs.
274 void sg_vm_suspend(sg_vm_t vm)
279 /** @brief Resume the execution of the VM. All processes on the VM run again.
280 * No resume cost occurs.
282 void sg_vm_resume(sg_vm_t vm)
287 /** @brief Immediately kills all processes within the given VM.
291 The memory allocated by these actors is leaked, unless you used :cpp:func:`simgrid::s4u::Actor::on_exit`.
295 * No extra delay occurs by default. You may let your actor sleep by a specific amount to simulate any extra delay that
298 void sg_vm_shutdown(sg_vm_t vm)
303 /** @brief Destroy a VM. Destroy the VM object from the simulation. */
304 void sg_vm_destroy(sg_vm_t vm)