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 pstate,
132 int core, double speedPeak, double speedScale,
134 : Cpu(model, host, NULL/*constraint*/, speedPeakList, pstate, core, speedPeak, speedScale, initiallyOn)
138 Cpu::Cpu(Model *model, simgrid::s4u::Host *host, lmm_constraint_t constraint,
139 xbt_dynar_t speedPeakList, int pstate,
140 int core, double speedPeak,
141 double speedScale, int initiallyOn)
142 : Resource(model, host->name().c_str(), constraint, initiallyOn)
144 , m_speedPeak(speedPeak)
145 , m_speedScale(speedScale)
148 host->pimpl_cpu = this;
149 xbt_assert(m_speedScale > 0, "Available speed has to be >0");
151 // Copy the power peak array:
152 p_speedPeakList = xbt_dynar_new(sizeof(double), nullptr);
153 unsigned long n = xbt_dynar_length(speedPeakList);
154 for (unsigned long i = 0; i != n; ++i) {
155 double value = xbt_dynar_get_as(speedPeakList, i, double);
156 xbt_dynar_push(p_speedPeakList, &value);
161 /* Currently, we assume that a VM does not have a multicore CPU. */
163 xbt_assert(model == surf_cpu_model_pm);
165 if (model->getUpdateMechanism() != UM_UNDEFINED) {
166 p_constraintCore = xbt_new(lmm_constraint_t, core);
167 p_constraintCoreId = xbt_new(void*, core);
170 for (i = 0; i < core; i++) {
171 /* just for a unique id, never used as a string. */
172 p_constraintCoreId[i] = bprintf("%s:%i", host->name().c_str(), i);
173 p_constraintCore[i] = lmm_constraint_new(model->getMaxminSystem(), p_constraintCoreId[i], m_speedScale * m_speedPeak);
180 if (p_constraintCoreId){
181 for (int i = 0; i < m_core; i++) {
182 xbt_free(p_constraintCoreId[i]);
184 xbt_free(p_constraintCore);
186 if (p_constraintCoreId)
187 xbt_free(p_constraintCoreId);
190 double Cpu::getCurrentPowerPeak()
195 int Cpu::getNbPStates()
197 return xbt_dynar_length(p_speedPeakList);
200 void Cpu::setPState(int pstate_index)
202 xbt_dynar_t plist = p_speedPeakList;
203 xbt_assert(pstate_index <= (int)xbt_dynar_length(plist),
204 "Invalid parameters for CPU %s (pstate %d > length of pstates %d)", getName(), pstate_index, (int)xbt_dynar_length(plist));
206 double new_peak_speed = xbt_dynar_get_as(plist, pstate_index, double);
207 m_pstate = pstate_index;
208 m_speedPeak = new_peak_speed;
218 double Cpu::getPowerPeakAt(int pstate_index)
220 xbt_dynar_t plist = p_speedPeakList;
221 xbt_assert((pstate_index <= (int)xbt_dynar_length(plist)), "Invalid parameters (pstate index out of bounds)");
223 return xbt_dynar_get_as(plist, pstate_index, double);
226 double Cpu::getSpeed(double load)
228 return load * m_speedPeak;
231 double Cpu::getAvailableSpeed()
233 /* number between 0 and 1 */
237 void Cpu::onSpeedChange() {
238 TRACE_surf_host_set_speed(surf_get_clock(), getName(),
239 m_core * m_speedScale * m_speedPeak);
252 void CpuAction::updateRemainingLazy(double now)
256 xbt_assert(getStateSet() == getModel()->getRunningActionSet(),
257 "You're updating an action that is not running.");
259 /* bogus priority, skip it */
260 xbt_assert(getPriority() > 0,
261 "You're updating an action that seems suspended.");
263 delta = now - m_lastUpdate;
266 XBT_CDEBUG(surf_kernel, "Updating action(%p): remains was %f, last_update was: %f", this, m_remains, m_lastUpdate);
267 double_update(&(m_remains), m_lastValue * delta, sg_maxmin_precision*sg_surf_precision);
269 if (TRACE_is_enabled()) {
270 Cpu *cpu = static_cast<Cpu*>(lmm_constraint_id(lmm_get_cnst_from_var(getModel()->getMaxminSystem(), getVariable(), 0)));
271 TRACE_surf_host_set_utilization(cpu->getName(), getCategory(), m_lastValue, m_lastUpdate, now - m_lastUpdate);
273 XBT_CDEBUG(surf_kernel, "Updating action(%p): remains is now %f", this, m_remains);
277 m_lastValue = lmm_variable_getvalue(getVariable());
282 * This function formulates a constraint problem that pins a given task to
283 * particular cores. Currently, it is possible to pin a task to an exactly one
284 * specific core. The system links the variable object of the task to the
285 * per-core constraint object.
287 * But, the taskset command on Linux takes a mask value specifying a CPU
288 * affinity setting of a given task. If the mask value is 0x03, the given task
289 * will be executed on the first core (CPU0) or the second core (CPU1) on the
290 * given PM. The schedular will determine appropriate placements of tasks,
291 * considering given CPU affinities and task activities.
293 * How should the system formulate constraint problems for an affinity to
296 * The cpu argument must be the host where the task is being executed. The
297 * action object does not have the information about the location where the
298 * action is being executed.
300 void CpuAction::setAffinity(Cpu *cpu, unsigned long mask)
302 lmm_variable_t var_obj = getVariable();
303 XBT_IN("(%p,%lx)", this, mask);
306 unsigned long nbits = 0;
308 /* FIXME: There is much faster algorithms doing this. */
309 for (int i = 0; i < cpu->m_core; i++) {
310 unsigned long has_affinity = (1UL << i) & mask;
316 XBT_CRITICAL("Do not specify multiple cores for an affinity mask.");
317 XBT_CRITICAL("See the comment in cpu_action_set_affinity().");
322 for (int i = 0; i < cpu->m_core; i++) {
323 XBT_DEBUG("clear affinity %p to cpu-%d@%s", this, i, cpu->getName());
324 lmm_shrink(cpu->getModel()->getMaxminSystem(), cpu->p_constraintCore[i], var_obj);
326 unsigned long has_affinity = (1UL << i) & mask;
328 /* This function only accepts an affinity setting on the host where the
329 * task is now running. In future, a task might move to another host.
330 * But, at this moment, this function cannot take an affinity setting on
333 * It might be possible to extend the code to allow this function to
334 * accept affinity settings on a future host. We might be able to assign
335 * zero to elem->value to maintain such inactive affinity settings in the
336 * system. But, this will make the system complex. */
337 XBT_DEBUG("set affinity %p to cpu-%d@%s", this, i, cpu->getName());
338 lmm_expand(cpu->getModel()->getMaxminSystem(), cpu->p_constraintCore[i], var_obj, 1.0);
342 if (cpu->getModel()->getUpdateMechanism() == UM_LAZY) {
343 /* FIXME (hypervisor): Do we need to do something for the LAZY mode? */
348 simgrid::xbt::signal<void(simgrid::surf::CpuAction*, e_surf_action_state_t)> CpuAction::onStateChange;
350 void CpuAction::setState(e_surf_action_state_t state){
351 e_surf_action_state_t previous = getState();
352 Action::setState(state);
353 onStateChange(this, previous);