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"
11 XBT_LOG_EXTERNAL_CATEGORY(surf_kernel);
12 XBT_LOG_NEW_DEFAULT_SUBCATEGORY(surf_cpu, surf,
13 "Logging specific to the SURF cpu module");
15 int autoload_surf_cpu_model = 1;
16 void_f_void_t surf_cpu_model_init_preparse = NULL;
18 simgrid::surf::CpuModel *surf_cpu_model_pm;
19 simgrid::surf::CpuModel *surf_cpu_model_vm;
28 Cpu *getActionCpu(CpuAction *action) {
29 return static_cast<Cpu*>(lmm_constraint_id(lmm_get_cnst_from_var
30 (action->getModel()->getMaxminSystem(),
31 action->getVariable(), 0)));
34 simgrid::xbt::signal<void(CpuAction*, e_surf_action_state_t, e_surf_action_state_t)> cpuActionStateChangedCallbacks;
40 void CpuModel::updateActionsStateLazy(double now, double /*delta*/)
43 while ((xbt_heap_size(getActionHeap()) > 0)
44 && (double_equals(xbt_heap_maxkey(getActionHeap()), now, sg_surf_precision))) {
45 action = static_cast<CpuAction*>(xbt_heap_pop(getActionHeap()));
46 XBT_CDEBUG(surf_kernel, "Something happened to action %p", action);
47 if (TRACE_is_enabled()) {
48 Cpu *cpu = static_cast<Cpu*>(lmm_constraint_id(lmm_get_cnst_from_var(getMaxminSystem(), action->getVariable(), 0)));
49 TRACE_surf_host_set_utilization(cpu->getName(), action->getCategory(),
50 lmm_variable_getvalue(action->getVariable()),
51 action->getLastUpdate(),
52 now - action->getLastUpdate());
56 XBT_CDEBUG(surf_kernel, "Action %p finished", action);
58 /* set the remains to 0 due to precision problems when updating the remaining amount */
59 action->setRemains(0);
60 action->setState(SURF_ACTION_DONE);
61 action->heapRemove(getActionHeap()); //FIXME: strange call since action was already popped
63 if (TRACE_is_enabled()) {
64 //defining the last timestamp that we can safely dump to trace file
65 //without losing the event ascending order (considering all CPU's)
67 ActionList *actionSet = getRunningActionSet();
68 for(ActionList::iterator it(actionSet->begin()), itend(actionSet->end())
69 ; it != itend ; ++it) {
70 action = static_cast<CpuAction*>(&*it);
72 smaller = action->getLastUpdate();
75 if (action->getLastUpdate() < smaller) {
76 smaller = action->getLastUpdate();
80 TRACE_last_timestamp_to_dump = smaller;
86 void CpuModel::updateActionsStateFull(double now, double delta)
88 CpuAction *action = NULL;
89 ActionList *running_actions = getRunningActionSet();
91 for(ActionList::iterator it(running_actions->begin()), itNext=it, itend(running_actions->end())
92 ; it != itend ; it=itNext) {
94 action = static_cast<CpuAction*>(&*it);
95 if (TRACE_is_enabled()) {
96 Cpu *x = static_cast<Cpu*> (lmm_constraint_id(lmm_get_cnst_from_var(getMaxminSystem(), action->getVariable(), 0)) );
98 TRACE_surf_host_set_utilization(x->getName(),
99 action->getCategory(),
100 lmm_variable_getvalue(action->getVariable()),
103 TRACE_last_timestamp_to_dump = now - delta;
106 action->updateRemains(lmm_variable_getvalue(action->getVariable()) * delta);
109 if (action->getMaxDuration() != NO_MAX_DURATION)
110 action->updateMaxDuration(delta);
113 if ((action->getRemainsNoUpdate() <= 0) &&
114 (lmm_get_variable_weight(action->getVariable()) > 0)) {
116 action->setState(SURF_ACTION_DONE);
117 } else if ((action->getMaxDuration() != NO_MAX_DURATION) &&
118 (action->getMaxDuration() <= 0)) {
120 action->setState(SURF_ACTION_DONE);
130 Cpu::Cpu(Model *model, simgrid::s4u::Host *host,
131 xbt_dynar_t speedPeakList, int core, double speedPeak)
132 : Cpu(model, host, NULL/*constraint*/, speedPeakList, core, speedPeak)
136 Cpu::Cpu(Model *model, simgrid::s4u::Host *host, lmm_constraint_t constraint,
137 xbt_dynar_t speedPeakList, int core, double speedPeak)
138 : Resource(model, host->name().c_str(), constraint)
142 p_speed.peak = speedPeak;
144 host->pimpl_cpu = this;
145 xbt_assert(p_speed.scale > 0, "Available speed has to be >0");
147 // Copy the power peak array:
148 p_speedPeakList = xbt_dynar_new(sizeof(double), nullptr);
149 unsigned long n = xbt_dynar_length(speedPeakList);
150 for (unsigned long i = 0; i != n; ++i) {
151 double value = xbt_dynar_get_as(speedPeakList, i, double);
152 xbt_dynar_push(p_speedPeakList, &value);
155 /* Currently, we assume that a VM does not have a multicore CPU. */
157 xbt_assert(model == surf_cpu_model_pm);
159 if (model->getUpdateMechanism() != UM_UNDEFINED) {
160 p_constraintCore = xbt_new(lmm_constraint_t, core);
161 p_constraintCoreId = xbt_new(void*, core);
164 for (i = 0; i < core; i++) {
165 /* just for a unique id, never used as a string. */
166 p_constraintCoreId[i] = bprintf("%s:%i", host->name().c_str(), i);
167 p_constraintCore[i] = lmm_constraint_new(model->getMaxminSystem(), p_constraintCoreId[i], p_speed.scale * p_speed.peak);
174 if (p_constraintCoreId){
175 for (int i = 0; i < m_core; i++) {
176 xbt_free(p_constraintCoreId[i]);
178 xbt_free(p_constraintCore);
180 if (p_constraintCoreId)
181 xbt_free(p_constraintCoreId);
183 xbt_dynar_free(&p_speedPeakList);
186 double Cpu::getCurrentPowerPeak()
191 int Cpu::getNbPStates()
193 return xbt_dynar_length(p_speedPeakList);
196 void Cpu::setPState(int pstate_index)
198 xbt_dynar_t plist = p_speedPeakList;
199 xbt_assert(pstate_index <= (int)xbt_dynar_length(plist),
200 "Invalid parameters for CPU %s (pstate %d > length of pstates %d)", getName(), pstate_index, (int)xbt_dynar_length(plist));
202 double new_peak_speed = xbt_dynar_get_as(plist, pstate_index, double);
203 m_pstate = pstate_index;
204 p_speed.peak = new_peak_speed;
214 double Cpu::getPowerPeakAt(int pstate_index)
216 xbt_dynar_t plist = p_speedPeakList;
217 xbt_assert((pstate_index <= (int)xbt_dynar_length(plist)), "Invalid parameters (pstate index out of bounds)");
219 return xbt_dynar_get_as(plist, pstate_index, double);
222 double Cpu::getSpeed(double load)
224 return load * p_speed.peak;
227 double Cpu::getAvailableSpeed()
229 /* number between 0 and 1 */
230 return p_speed.scale;
233 void Cpu::onSpeedChange() {
234 TRACE_surf_host_set_speed(surf_get_clock(), getName(),
235 m_core * p_speed.scale * p_speed.peak);
244 void Cpu::set_state_trace(tmgr_trace_t trace)
246 xbt_assert(p_stateEvent==NULL,"Cannot set a second state trace to Host %s", m_host->name().c_str());
248 p_stateEvent = future_evt_set->add_trace(trace, 0.0, this);
250 void Cpu::set_speed_trace(tmgr_trace_t trace)
252 xbt_assert(p_speed.event==NULL,"Cannot set a second speed trace to Host %s", m_host->name().c_str());
254 p_speed.event = future_evt_set->add_trace(trace, 0.0, this);
262 void CpuAction::updateRemainingLazy(double now)
266 xbt_assert(getStateSet() == getModel()->getRunningActionSet(),
267 "You're updating an action that is not running.");
269 /* bogus priority, skip it */
270 xbt_assert(getPriority() > 0,
271 "You're updating an action that seems suspended.");
273 delta = now - m_lastUpdate;
276 XBT_CDEBUG(surf_kernel, "Updating action(%p): remains was %f, last_update was: %f", this, m_remains, m_lastUpdate);
277 double_update(&(m_remains), m_lastValue * delta, sg_maxmin_precision*sg_surf_precision);
279 if (TRACE_is_enabled()) {
280 Cpu *cpu = static_cast<Cpu*>(lmm_constraint_id(lmm_get_cnst_from_var(getModel()->getMaxminSystem(), getVariable(), 0)));
281 TRACE_surf_host_set_utilization(cpu->getName(), getCategory(), m_lastValue, m_lastUpdate, now - m_lastUpdate);
283 XBT_CDEBUG(surf_kernel, "Updating action(%p): remains is now %f", this, m_remains);
287 m_lastValue = lmm_variable_getvalue(getVariable());
292 * This function formulates a constraint problem that pins a given task to
293 * particular cores. Currently, it is possible to pin a task to an exactly one
294 * specific core. The system links the variable object of the task to the
295 * per-core constraint object.
297 * But, the taskset command on Linux takes a mask value specifying a CPU
298 * affinity setting of a given task. If the mask value is 0x03, the given task
299 * will be executed on the first core (CPU0) or the second core (CPU1) on the
300 * given PM. The schedular will determine appropriate placements of tasks,
301 * considering given CPU affinities and task activities.
303 * How should the system formulate constraint problems for an affinity to
306 * The cpu argument must be the host where the task is being executed. The
307 * action object does not have the information about the location where the
308 * action is being executed.
310 void CpuAction::setAffinity(Cpu *cpu, unsigned long mask)
312 lmm_variable_t var_obj = getVariable();
313 XBT_IN("(%p,%lx)", this, mask);
316 unsigned long nbits = 0;
318 /* FIXME: There is much faster algorithms doing this. */
319 for (int i = 0; i < cpu->m_core; i++) {
320 unsigned long has_affinity = (1UL << i) & mask;
326 XBT_CRITICAL("Do not specify multiple cores for an affinity mask.");
327 XBT_CRITICAL("See the comment in cpu_action_set_affinity().");
332 for (int i = 0; i < cpu->m_core; i++) {
333 XBT_DEBUG("clear affinity %p to cpu-%d@%s", this, i, cpu->getName());
334 lmm_shrink(cpu->getModel()->getMaxminSystem(), cpu->p_constraintCore[i], var_obj);
336 unsigned long has_affinity = (1UL << i) & mask;
338 /* This function only accepts an affinity setting on the host where the
339 * task is now running. In future, a task might move to another host.
340 * But, at this moment, this function cannot take an affinity setting on
343 * It might be possible to extend the code to allow this function to
344 * accept affinity settings on a future host. We might be able to assign
345 * zero to elem->value to maintain such inactive affinity settings in the
346 * system. But, this will make the system complex. */
347 XBT_DEBUG("set affinity %p to cpu-%d@%s", this, i, cpu->getName());
348 lmm_expand(cpu->getModel()->getMaxminSystem(), cpu->p_constraintCore[i], var_obj, 1.0);
352 if (cpu->getModel()->getUpdateMechanism() == UM_LAZY) {
353 /* FIXME (hypervisor): Do we need to do something for the LAZY mode? */
358 simgrid::xbt::signal<void(simgrid::surf::CpuAction*, e_surf_action_state_t)> CpuAction::onStateChange;
360 void CpuAction::setState(e_surf_action_state_t state){
361 e_surf_action_state_t previous = getState();
362 Action::setState(state);
363 onStateChange(this, previous);