1 /* Copyright (c) 2013-2015. The SimGrid Team.
2 * All rights reserved. */
4 /* This program is free software; you can redistribute it and/or modify it
5 * under the terms of the license (GNU LGPL) which comes with this package. */
8 #include "cpu_interface.hpp"
9 #include "plugins/energy.hpp"
10 #include "src/instr/instr_private.h" // TRACE_is_enabled(). FIXME: remove by subscribing tracing to the surf signals
12 XBT_LOG_EXTERNAL_CATEGORY(surf_kernel);
13 XBT_LOG_NEW_DEFAULT_SUBCATEGORY(surf_cpu, surf, "Logging specific to the SURF cpu module");
15 void_f_void_t surf_cpu_model_init_preparse = NULL;
17 simgrid::surf::CpuModel *surf_cpu_model_pm;
18 simgrid::surf::CpuModel *surf_cpu_model_vm;
27 simgrid::xbt::signal<void(CpuAction*, Action::State, Action::State)> cpuActionStateChangedCallbacks;
33 CpuModel::~CpuModel() {}
35 void CpuModel::updateActionsStateLazy(double now, double /*delta*/)
38 while ((xbt_heap_size(getActionHeap()) > 0)
39 && (double_equals(xbt_heap_maxkey(getActionHeap()), now, sg_surf_precision))) {
40 action = static_cast<CpuAction*>(xbt_heap_pop(getActionHeap()));
41 XBT_CDEBUG(surf_kernel, "Something happened to action %p", action);
42 if (TRACE_is_enabled()) {
43 Cpu *cpu = static_cast<Cpu*>(lmm_constraint_id(lmm_get_cnst_from_var(getMaxminSystem(), action->getVariable(), 0)));
44 TRACE_surf_host_set_utilization(cpu->getName(), action->getCategory(),
45 lmm_variable_getvalue(action->getVariable()),
46 action->getLastUpdate(),
47 now - action->getLastUpdate());
51 XBT_CDEBUG(surf_kernel, "Action %p finished", action);
53 /* set the remains to 0 due to precision problems when updating the remaining amount */
54 action->setRemains(0);
55 action->setState(Action::State::done);
56 action->heapRemove(getActionHeap()); //FIXME: strange call since action was already popped
58 if (TRACE_is_enabled()) {
59 //defining the last timestamp that we can safely dump to trace file
60 //without losing the event ascending order (considering all CPU's)
62 ActionList *actionSet = getRunningActionSet();
63 for(ActionList::iterator it(actionSet->begin()), itend(actionSet->end())
64 ; it != itend ; ++it) {
65 action = static_cast<CpuAction*>(&*it);
67 smaller = action->getLastUpdate();
70 if (action->getLastUpdate() < smaller) {
71 smaller = action->getLastUpdate();
75 TRACE_last_timestamp_to_dump = smaller;
81 void CpuModel::updateActionsStateFull(double now, double delta)
83 CpuAction *action = NULL;
84 ActionList *running_actions = getRunningActionSet();
86 for(ActionList::iterator it(running_actions->begin()), itNext=it, itend(running_actions->end())
87 ; it != itend ; it=itNext) {
89 action = static_cast<CpuAction*>(&*it);
90 if (TRACE_is_enabled()) {
91 Cpu *cpu = static_cast<Cpu*> (lmm_constraint_id(lmm_get_cnst_from_var(getMaxminSystem(), action->getVariable(), 0)) );
93 TRACE_surf_host_set_utilization(cpu->getName(),
94 action->getCategory(),
95 lmm_variable_getvalue(action->getVariable()),
98 TRACE_last_timestamp_to_dump = now - delta;
101 action->updateRemains(lmm_variable_getvalue(action->getVariable()) * delta);
104 if (action->getMaxDuration() != NO_MAX_DURATION)
105 action->updateMaxDuration(delta);
108 if ((action->getRemainsNoUpdate() <= 0) &&
109 (lmm_get_variable_weight(action->getVariable()) > 0)) {
111 action->setState(Action::State::done);
112 } else if ((action->getMaxDuration() != NO_MAX_DURATION) &&
113 (action->getMaxDuration() <= 0)) {
115 action->setState(Action::State::done);
120 bool CpuModel::next_occuring_event_isIdempotent()
128 Cpu::Cpu(Model *model, simgrid::s4u::Host *host, xbt_dynar_t speedPerPstate, int core)
129 : Cpu(model, host, NULL/*constraint*/, speedPerPstate, core)
133 Cpu::Cpu(Model *model, simgrid::s4u::Host *host, lmm_constraint_t constraint,
134 xbt_dynar_t speedPerPstate, int core)
135 : Resource(model, host->name().c_str(), constraint)
139 xbt_assert(core > 0, "Host %s must have at least one core, not 0.", host->name().c_str());
141 speed_.peak = xbt_dynar_get_as(speedPerPstate, 0/*pstate*/, double);
143 host->pimpl_cpu = this;
144 xbt_assert(speed_.scale > 0, "Speed of host %s must be >0", host->name().c_str());
146 // Copy the power peak array:
147 speedPerPstate_ = xbt_dynar_new(sizeof(double), nullptr);
148 unsigned long n = xbt_dynar_length(speedPerPstate);
149 for (unsigned long i = 0; i != n; ++i) {
150 double value = xbt_dynar_get_as(speedPerPstate, i, double);
151 xbt_dynar_push(speedPerPstate_, &value);
154 xbt_assert(model == surf_cpu_model_pm || core==1, "Currently, VM cannot be multicore");
156 if (model->getUpdateMechanism() != UM_UNDEFINED) {
157 p_constraintCore = xbt_new(lmm_constraint_t, core);
158 p_constraintCoreId = xbt_new(void*, core);
160 for (int i = 0; i < core; i++) {
161 /* just for a unique id, never used as a string. */
162 p_constraintCoreId[i] = bprintf("%s:%i", host->name().c_str(), i);
163 p_constraintCore[i] = lmm_constraint_new(model->getMaxminSystem(), p_constraintCoreId[i], speed_.scale * speed_.peak);
170 if (p_constraintCoreId){
171 for (int i = 0; i < coresAmount_; i++)
172 xbt_free(p_constraintCoreId[i]);
173 xbt_free(p_constraintCore);
175 xbt_free(p_constraintCoreId);
176 xbt_dynar_free(&speedPerPstate_);
179 double Cpu::getCurrentPowerPeak()
184 int Cpu::getNbPStates()
186 return xbt_dynar_length(speedPerPstate_);
189 void Cpu::setPState(int pstate_index)
191 xbt_dynar_t plist = speedPerPstate_;
192 xbt_assert(pstate_index <= (int)xbt_dynar_length(plist),
193 "Invalid parameters for CPU %s (pstate %d > length of pstates %d)", getName(), pstate_index, (int)xbt_dynar_length(plist));
195 double new_peak_speed = xbt_dynar_get_as(plist, pstate_index, double);
196 pstate_ = pstate_index;
197 speed_.peak = new_peak_speed;
207 double Cpu::getPowerPeakAt(int pstate_index)
209 xbt_dynar_t plist = speedPerPstate_;
210 xbt_assert((pstate_index <= (int)xbt_dynar_length(plist)), "Invalid parameters (pstate index out of bounds)");
212 return xbt_dynar_get_as(plist, pstate_index, double);
215 double Cpu::getSpeed(double load)
217 return load * speed_.peak;
220 double Cpu::getAvailableSpeed()
222 /* number between 0 and 1 */
226 void Cpu::onSpeedChange() {
227 TRACE_surf_host_set_speed(surf_get_clock(), getName(), coresAmount_ * speed_.scale * speed_.peak);
236 void Cpu::setStateTrace(tmgr_trace_t trace)
238 xbt_assert(stateEvent_==NULL,"Cannot set a second state trace to Host %s", host_->name().c_str());
240 stateEvent_ = future_evt_set->add_trace(trace, 0.0, this);
242 void Cpu::setSpeedTrace(tmgr_trace_t trace)
244 xbt_assert(speed_.event==NULL,"Cannot set a second speed trace to Host %s", host_->name().c_str());
246 speed_.event = future_evt_set->add_trace(trace, 0.0, this);
254 void CpuAction::updateRemainingLazy(double now)
256 xbt_assert(getStateSet() == getModel()->getRunningActionSet(), "You're updating an action that is not running.");
257 xbt_assert(getPriority() > 0, "You're updating an action that seems suspended.");
259 double delta = now - lastUpdate_;
262 XBT_CDEBUG(surf_kernel, "Updating action(%p): remains was %f, last_update was: %f", this, remains_, lastUpdate_);
263 double_update(&(remains_), lastValue_ * delta, sg_maxmin_precision*sg_surf_precision);
265 if (TRACE_is_enabled()) {
266 Cpu *cpu = static_cast<Cpu*>(lmm_constraint_id(lmm_get_cnst_from_var(getModel()->getMaxminSystem(), getVariable(), 0)));
267 TRACE_surf_host_set_utilization(cpu->getName(), getCategory(), lastValue_, lastUpdate_, now - lastUpdate_);
269 XBT_CDEBUG(surf_kernel, "Updating action(%p): remains is now %f", this, remains_);
273 lastValue_ = lmm_variable_getvalue(getVariable());
278 * This function formulates a constraint problem that pins a given task to
279 * particular cores. Currently, it is possible to pin a task to an exactly one
280 * specific core. The system links the variable object of the task to the
281 * per-core constraint object.
283 * But, the taskset command on Linux takes a mask value specifying a CPU
284 * affinity setting of a given task. If the mask value is 0x03, the given task
285 * will be executed on the first core (CPU0) or the second core (CPU1) on the
286 * given PM. The schedular will determine appropriate placements of tasks,
287 * considering given CPU affinities and task activities.
289 * How should the system formulate constraint problems for an affinity to
292 * The cpu argument must be the host where the task is being executed. The
293 * action object does not have the information about the location where the
294 * action is being executed.
296 void CpuAction::setAffinity(Cpu *cpu, unsigned long mask)
298 lmm_variable_t var_obj = getVariable();
299 XBT_IN("(%p,%lx)", this, mask);
302 unsigned long nbits = 0;
304 /* FIXME: There is much faster algorithms doing this. */
305 for (int i = 0; i < cpu->coresAmount_; i++) {
306 unsigned long has_affinity = (1UL << i) & mask;
311 xbt_assert(nbits <= 1, "Affinity mask cannot span over multiple cores.");
314 for (int i = 0; i < cpu->coresAmount_; i++) {
315 XBT_DEBUG("clear affinity %p to cpu-%d@%s", this, i, cpu->getName());
316 lmm_shrink(cpu->getModel()->getMaxminSystem(), cpu->p_constraintCore[i], var_obj);
318 unsigned long has_affinity = (1UL << i) & mask;
320 /* This function only accepts an affinity setting on the host where the
321 * task is now running. In future, a task might move to another host.
322 * But, at this moment, this function cannot take an affinity setting on
325 * It might be possible to extend the code to allow this function to
326 * accept affinity settings on a future host. We might be able to assign
327 * zero to elem->value to maintain such inactive affinity settings in the
328 * system. But, this will make the system complex. */
329 XBT_DEBUG("set affinity %p to cpu-%d@%s", this, i, cpu->getName());
330 lmm_expand(cpu->getModel()->getMaxminSystem(), cpu->p_constraintCore[i], var_obj, 1.0);
334 if (cpu->getModel()->getUpdateMechanism() == UM_LAZY) {
335 /* FIXME (hypervisor): Do we need to do something for the LAZY mode? */
340 simgrid::xbt::signal<void(simgrid::surf::CpuAction*, Action::State)> CpuAction::onStateChange;
342 void CpuAction::setState(Action::State state){
343 Action::State previous = getState();
344 Action::setState(state);
345 onStateChange(this, previous);
347 std::list<Cpu*> CpuAction::cpus() {
348 std::list<Cpu*> retlist;
349 lmm_system_t sys = getModel()->getMaxminSystem();
350 int llen = lmm_get_number_of_cnst_from_var(sys, getVariable());
352 for(int i = 0; i<llen; i++)
353 retlist.push_back( (Cpu*)(lmm_constraint_id( lmm_get_cnst_from_var(sys, getVariable(), i) )) );