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 void CpuModel::updateActionsStateLazy(double now, double /*delta*/)
36 while ((xbt_heap_size(getActionHeap()) > 0)
37 && (double_equals(xbt_heap_maxkey(getActionHeap()), now, sg_surf_precision))) {
38 action = static_cast<CpuAction*>(xbt_heap_pop(getActionHeap()));
39 XBT_CDEBUG(surf_kernel, "Something happened to action %p", action);
40 if (TRACE_is_enabled()) {
41 Cpu *cpu = static_cast<Cpu*>(lmm_constraint_id(lmm_get_cnst_from_var(getMaxminSystem(), action->getVariable(), 0)));
42 TRACE_surf_host_set_utilization(cpu->getName(), action->getCategory(),
43 lmm_variable_getvalue(action->getVariable()),
44 action->getLastUpdate(),
45 now - action->getLastUpdate());
49 XBT_CDEBUG(surf_kernel, "Action %p finished", action);
51 /* set the remains to 0 due to precision problems when updating the remaining amount */
52 action->setRemains(0);
53 action->setState(Action::State::done);
54 action->heapRemove(getActionHeap()); //FIXME: strange call since action was already popped
56 if (TRACE_is_enabled()) {
57 //defining the last timestamp that we can safely dump to trace file
58 //without losing the event ascending order (considering all CPU's)
60 ActionList *actionSet = getRunningActionSet();
61 for(ActionList::iterator it(actionSet->begin()), itend(actionSet->end())
62 ; it != itend ; ++it) {
63 action = static_cast<CpuAction*>(&*it);
65 smaller = action->getLastUpdate();
68 if (action->getLastUpdate() < smaller) {
69 smaller = action->getLastUpdate();
73 TRACE_last_timestamp_to_dump = smaller;
79 void CpuModel::updateActionsStateFull(double now, double delta)
81 CpuAction *action = NULL;
82 ActionList *running_actions = getRunningActionSet();
84 for(ActionList::iterator it(running_actions->begin()), itNext=it, itend(running_actions->end())
85 ; it != itend ; it=itNext) {
87 action = static_cast<CpuAction*>(&*it);
88 if (TRACE_is_enabled()) {
89 Cpu *cpu = static_cast<Cpu*> (lmm_constraint_id(lmm_get_cnst_from_var(getMaxminSystem(), action->getVariable(), 0)) );
91 TRACE_surf_host_set_utilization(cpu->getName(),
92 action->getCategory(),
93 lmm_variable_getvalue(action->getVariable()),
96 TRACE_last_timestamp_to_dump = now - delta;
99 action->updateRemains(lmm_variable_getvalue(action->getVariable()) * delta);
102 if (action->getMaxDuration() != NO_MAX_DURATION)
103 action->updateMaxDuration(delta);
106 if ((action->getRemainsNoUpdate() <= 0) &&
107 (lmm_get_variable_weight(action->getVariable()) > 0)) {
109 action->setState(Action::State::done);
110 } else if ((action->getMaxDuration() != NO_MAX_DURATION) &&
111 (action->getMaxDuration() <= 0)) {
113 action->setState(Action::State::done);
121 Cpu::Cpu(Model *model, simgrid::s4u::Host *host, xbt_dynar_t speedPerPstate, int core)
122 : Cpu(model, host, NULL/*constraint*/, speedPerPstate, core)
126 Cpu::Cpu(Model *model, simgrid::s4u::Host *host, lmm_constraint_t constraint,
127 xbt_dynar_t speedPerPstate, int core)
128 : Resource(model, host->name().c_str(), constraint)
132 xbt_assert(core > 0, "Host %s must have at least one core, not 0.", host->name().c_str());
134 speed_.peak = xbt_dynar_get_as(speedPerPstate, 0/*pstate*/, double);
136 host->pimpl_cpu = this;
137 xbt_assert(speed_.scale > 0, "Speed of host %s must be >0", host->name().c_str());
139 // Copy the power peak array:
140 speedPerPstate_ = xbt_dynar_new(sizeof(double), nullptr);
141 unsigned long n = xbt_dynar_length(speedPerPstate);
142 for (unsigned long i = 0; i != n; ++i) {
143 double value = xbt_dynar_get_as(speedPerPstate, i, double);
144 xbt_dynar_push(speedPerPstate_, &value);
147 xbt_assert(model == surf_cpu_model_pm || core==1, "Currently, VM cannot be multicore");
149 if (model->getUpdateMechanism() != UM_UNDEFINED) {
150 p_constraintCore = xbt_new(lmm_constraint_t, core);
151 p_constraintCoreId = xbt_new(void*, core);
153 for (int i = 0; i < core; i++) {
154 /* just for a unique id, never used as a string. */
155 p_constraintCoreId[i] = bprintf("%s:%i", host->name().c_str(), i);
156 p_constraintCore[i] = lmm_constraint_new(model->getMaxminSystem(), p_constraintCoreId[i], speed_.scale * speed_.peak);
163 if (p_constraintCoreId){
164 for (int i = 0; i < coresAmount_; i++)
165 xbt_free(p_constraintCoreId[i]);
166 xbt_free(p_constraintCore);
168 xbt_free(p_constraintCoreId);
169 xbt_dynar_free(&speedPerPstate_);
172 double Cpu::getCurrentPowerPeak()
177 int Cpu::getNbPStates()
179 return xbt_dynar_length(speedPerPstate_);
182 void Cpu::setPState(int pstate_index)
184 xbt_dynar_t plist = speedPerPstate_;
185 xbt_assert(pstate_index <= (int)xbt_dynar_length(plist),
186 "Invalid parameters for CPU %s (pstate %d > length of pstates %d)", getName(), pstate_index, (int)xbt_dynar_length(plist));
188 double new_peak_speed = xbt_dynar_get_as(plist, pstate_index, double);
189 pstate_ = pstate_index;
190 speed_.peak = new_peak_speed;
200 double Cpu::getPowerPeakAt(int pstate_index)
202 xbt_dynar_t plist = speedPerPstate_;
203 xbt_assert((pstate_index <= (int)xbt_dynar_length(plist)), "Invalid parameters (pstate index out of bounds)");
205 return xbt_dynar_get_as(plist, pstate_index, double);
208 double Cpu::getSpeed(double load)
210 return load * speed_.peak;
213 double Cpu::getAvailableSpeed()
215 /* number between 0 and 1 */
219 void Cpu::onSpeedChange() {
220 TRACE_surf_host_set_speed(surf_get_clock(), getName(), coresAmount_ * speed_.scale * speed_.peak);
229 void Cpu::setStateTrace(tmgr_trace_t trace)
231 xbt_assert(stateEvent_==NULL,"Cannot set a second state trace to Host %s", host_->name().c_str());
233 stateEvent_ = future_evt_set->add_trace(trace, 0.0, this);
235 void Cpu::setSpeedTrace(tmgr_trace_t trace)
237 xbt_assert(speed_.event==NULL,"Cannot set a second speed trace to Host %s", host_->name().c_str());
239 speed_.event = future_evt_set->add_trace(trace, 0.0, this);
247 void CpuAction::updateRemainingLazy(double now)
249 xbt_assert(getStateSet() == getModel()->getRunningActionSet(), "You're updating an action that is not running.");
250 xbt_assert(getPriority() > 0, "You're updating an action that seems suspended.");
252 double delta = now - m_lastUpdate;
255 XBT_CDEBUG(surf_kernel, "Updating action(%p): remains was %f, last_update was: %f", this, m_remains, m_lastUpdate);
256 double_update(&(m_remains), m_lastValue * delta, sg_maxmin_precision*sg_surf_precision);
258 if (TRACE_is_enabled()) {
259 Cpu *cpu = static_cast<Cpu*>(lmm_constraint_id(lmm_get_cnst_from_var(getModel()->getMaxminSystem(), getVariable(), 0)));
260 TRACE_surf_host_set_utilization(cpu->getName(), getCategory(), m_lastValue, m_lastUpdate, now - m_lastUpdate);
262 XBT_CDEBUG(surf_kernel, "Updating action(%p): remains is now %f", this, m_remains);
266 m_lastValue = lmm_variable_getvalue(getVariable());
271 * This function formulates a constraint problem that pins a given task to
272 * particular cores. Currently, it is possible to pin a task to an exactly one
273 * specific core. The system links the variable object of the task to the
274 * per-core constraint object.
276 * But, the taskset command on Linux takes a mask value specifying a CPU
277 * affinity setting of a given task. If the mask value is 0x03, the given task
278 * will be executed on the first core (CPU0) or the second core (CPU1) on the
279 * given PM. The schedular will determine appropriate placements of tasks,
280 * considering given CPU affinities and task activities.
282 * How should the system formulate constraint problems for an affinity to
285 * The cpu argument must be the host where the task is being executed. The
286 * action object does not have the information about the location where the
287 * action is being executed.
289 void CpuAction::setAffinity(Cpu *cpu, unsigned long mask)
291 lmm_variable_t var_obj = getVariable();
292 XBT_IN("(%p,%lx)", this, mask);
295 unsigned long nbits = 0;
297 /* FIXME: There is much faster algorithms doing this. */
298 for (int i = 0; i < cpu->coresAmount_; i++) {
299 unsigned long has_affinity = (1UL << i) & mask;
304 xbt_assert(nbits <= 1, "Affinity mask cannot span over multiple cores.");
307 for (int i = 0; i < cpu->coresAmount_; i++) {
308 XBT_DEBUG("clear affinity %p to cpu-%d@%s", this, i, cpu->getName());
309 lmm_shrink(cpu->getModel()->getMaxminSystem(), cpu->p_constraintCore[i], var_obj);
311 unsigned long has_affinity = (1UL << i) & mask;
313 /* This function only accepts an affinity setting on the host where the
314 * task is now running. In future, a task might move to another host.
315 * But, at this moment, this function cannot take an affinity setting on
318 * It might be possible to extend the code to allow this function to
319 * accept affinity settings on a future host. We might be able to assign
320 * zero to elem->value to maintain such inactive affinity settings in the
321 * system. But, this will make the system complex. */
322 XBT_DEBUG("set affinity %p to cpu-%d@%s", this, i, cpu->getName());
323 lmm_expand(cpu->getModel()->getMaxminSystem(), cpu->p_constraintCore[i], var_obj, 1.0);
327 if (cpu->getModel()->getUpdateMechanism() == UM_LAZY) {
328 /* FIXME (hypervisor): Do we need to do something for the LAZY mode? */
333 simgrid::xbt::signal<void(simgrid::surf::CpuAction*, Action::State)> CpuAction::onStateChange;
335 void CpuAction::setState(Action::State state){
336 Action::State previous = getState();
337 Action::setState(state);
338 onStateChange(this, previous);
340 std::list<Cpu*> CpuAction::cpus() {
341 std::list<Cpu*> retlist;
342 lmm_system_t sys = getModel()->getMaxminSystem();
343 int llen = lmm_get_number_of_cnst_from_var(sys, getVariable());
345 for(int i = 0; i<llen; i++)
346 retlist.push_back( (Cpu*)(lmm_constraint_id( lmm_get_cnst_from_var(sys, getVariable(), i) )) );