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. */
7 #include "cpu_interface.hpp"
8 #include "plugins/energy.hpp"
10 XBT_LOG_EXTERNAL_CATEGORY(surf_kernel);
11 XBT_LOG_NEW_DEFAULT_SUBCATEGORY(surf_cpu, surf,
12 "Logging specific to the SURF cpu module");
14 int autoload_surf_cpu_model = 1;
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;
23 simgrid::xbt::FacetLevel<simgrid::Host, Cpu> Cpu::LEVEL;
28 LEVEL = simgrid::Host::add_level<simgrid::surf::Cpu>();
35 Cpu *getActionCpu(CpuAction *action) {
36 return static_cast<Cpu*>(lmm_constraint_id(lmm_get_cnst_from_var
37 (action->getModel()->getMaxminSystem(),
38 action->getVariable(), 0)));
41 surf_callback(void, Cpu*) cpuCreatedCallbacks;
42 surf_callback(void, Cpu*) cpuDestructedCallbacks;
43 surf_callback(void, Cpu*, e_surf_resource_state_t, e_surf_resource_state_t) cpuStateChangedCallbacks;
44 surf_callback(void, CpuAction*, e_surf_action_state_t, e_surf_action_state_t) cpuActionStateChangedCallbacks;
45 void cpu_add_traces(){
46 surf_cpu_model_pm->addTraces();
53 void CpuModel::updateActionsStateLazy(double now, double /*delta*/)
56 while ((xbt_heap_size(getActionHeap()) > 0)
57 && (double_equals(xbt_heap_maxkey(getActionHeap()), now, sg_surf_precision))) {
58 action = static_cast<CpuAction*>(xbt_heap_pop(getActionHeap()));
59 XBT_CDEBUG(surf_kernel, "Something happened to action %p", action);
60 if (TRACE_is_enabled()) {
61 Cpu *cpu = static_cast<Cpu*>(lmm_constraint_id(lmm_get_cnst_from_var(getMaxminSystem(), action->getVariable(), 0)));
62 TRACE_surf_host_set_utilization(cpu->getName(), action->getCategory(),
63 lmm_variable_getvalue(action->getVariable()),
64 action->getLastUpdate(),
65 now - action->getLastUpdate());
69 XBT_CDEBUG(surf_kernel, "Action %p finished", action);
71 /* set the remains to 0 due to precision problems when updating the remaining amount */
72 action->setRemains(0);
73 action->setState(SURF_ACTION_DONE);
74 action->heapRemove(getActionHeap()); //FIXME: strange call since action was already popped
76 if (TRACE_is_enabled()) {
77 //defining the last timestamp that we can safely dump to trace file
78 //without losing the event ascending order (considering all CPU's)
80 ActionList *actionSet = getRunningActionSet();
81 for(ActionList::iterator it(actionSet->begin()), itend(actionSet->end())
82 ; it != itend ; ++it) {
83 action = static_cast<CpuAction*>(&*it);
85 smaller = action->getLastUpdate();
88 if (action->getLastUpdate() < smaller) {
89 smaller = action->getLastUpdate();
93 TRACE_last_timestamp_to_dump = smaller;
99 void CpuModel::updateActionsStateFull(double now, double delta)
101 CpuAction *action = NULL;
102 ActionList *running_actions = getRunningActionSet();
104 for(ActionList::iterator it(running_actions->begin()), itNext=it, itend(running_actions->end())
105 ; it != itend ; it=itNext) {
107 action = static_cast<CpuAction*>(&*it);
108 if (TRACE_is_enabled()) {
109 Cpu *x = static_cast<Cpu*> (lmm_constraint_id(lmm_get_cnst_from_var(getMaxminSystem(), action->getVariable(), 0)) );
111 TRACE_surf_host_set_utilization(x->getName(),
112 action->getCategory(),
113 lmm_variable_getvalue(action->getVariable()),
116 TRACE_last_timestamp_to_dump = now - delta;
119 action->updateRemains(lmm_variable_getvalue(action->getVariable()) * delta);
122 if (action->getMaxDuration() != NO_MAX_DURATION)
123 action->updateMaxDuration(delta);
126 if ((action->getRemainsNoUpdate() <= 0) &&
127 (lmm_get_variable_weight(action->getVariable()) > 0)) {
129 action->setState(SURF_ACTION_DONE);
130 } else if ((action->getMaxDuration() != NO_MAX_DURATION) &&
131 (action->getMaxDuration() <= 0)) {
133 action->setState(SURF_ACTION_DONE);
148 Cpu::Cpu(Model *model, const char *name,
149 int core, double speedPeak, double speedScale,
150 e_surf_resource_state_t stateInitial)
151 : Resource(model, name, stateInitial)
153 , m_speedPeak(speedPeak)
154 , m_speedScale(speedScale)
159 Cpu::Cpu(Model *model, const char *name,
160 lmm_constraint_t constraint, int core, double speedPeak,
161 double speedScale, e_surf_resource_state_t stateInitial)
162 : Resource(model, name, constraint, stateInitial)
164 , m_speedPeak(speedPeak)
165 , m_speedScale(speedScale)
167 /* At now, we assume that a VM does not have a multicore CPU. */
169 xbt_assert(model == surf_cpu_model_pm);
171 if (model->getUpdateMechanism() != UM_UNDEFINED) {
172 p_constraintCore = xbt_new(lmm_constraint_t, core);
173 p_constraintCoreId = xbt_new(void*, core);
176 for (i = 0; i < core; i++) {
177 /* just for a unique id, never used as a string. */
178 p_constraintCoreId[i] = bprintf("%s:%i", name, i);
179 p_constraintCore[i] = lmm_constraint_new(model->getMaxminSystem(), p_constraintCoreId[i], m_speedScale * m_speedPeak);
184 Cpu::Cpu(Model *model, const char *name,
185 lmm_constraint_t constraint, int core, double speedPeak, double speedScale)
186 : Cpu(model, name, constraint, core, speedPeak, speedScale, SURF_RESOURCE_ON)
189 Cpu::Cpu(Model *model, const char *name,
190 int core, double speedPeak, double speedScale)
191 : Cpu(model, name, core, speedPeak, speedScale, SURF_RESOURCE_ON)
195 surf_callback_emit(cpuDestructedCallbacks, this);
196 if (p_constraintCoreId){
197 for (int i = 0; i < m_core; i++) {
198 xbt_free(p_constraintCoreId[i]);
200 xbt_free(p_constraintCore);
202 if (p_constraintCoreId)
203 xbt_free(p_constraintCoreId);
206 double Cpu::getCurrentPowerPeak()
211 double Cpu::getSpeed(double load)
213 return load * m_speedPeak;
216 double Cpu::getAvailableSpeed()
218 /* number between 0 and 1 */
227 void Cpu::setState(e_surf_resource_state_t state)
229 e_surf_resource_state_t old = Resource::getState();
230 Resource::setState(state);
231 surf_callback_emit(cpuStateChangedCallbacks, this, old, state);
234 void Cpu::plug(simgrid::Host* host)
236 if (this->m_host != nullptr)
237 xbt_die("Aleady plugged into host %s", host->id().c_str());
238 host->set_facet(this);
240 simgrid::surf::cpuCreatedCallbacks(this);
241 simgrid::surf::cpuStateChangedCallbacks(this,
242 SURF_RESOURCE_ON, this->getState());
249 void CpuAction::updateRemainingLazy(double now)
253 xbt_assert(getStateSet() == getModel()->getRunningActionSet(),
254 "You're updating an action that is not running.");
256 /* bogus priority, skip it */
257 xbt_assert(getPriority() > 0,
258 "You're updating an action that seems suspended.");
260 delta = now - m_lastUpdate;
263 XBT_CDEBUG(surf_kernel, "Updating action(%p): remains was %f, last_update was: %f", this, m_remains, m_lastUpdate);
264 double_update(&(m_remains), m_lastValue * delta, sg_maxmin_precision*sg_surf_precision);
266 if (TRACE_is_enabled()) {
267 Cpu *cpu = static_cast<Cpu*>(lmm_constraint_id(lmm_get_cnst_from_var(getModel()->getMaxminSystem(), getVariable(), 0)));
268 TRACE_surf_host_set_utilization(cpu->getName(), getCategory(), m_lastValue, m_lastUpdate, now - m_lastUpdate);
270 XBT_CDEBUG(surf_kernel, "Updating action(%p): remains is now %f", this, m_remains);
274 m_lastValue = lmm_variable_getvalue(getVariable());
279 * This function formulates a constraint problem that pins a given task to
280 * particular cores. Currently, it is possible to pin a task to an exactly one
281 * specific core. The system links the variable object of the task to the
282 * per-core constraint object.
284 * But, the taskset command on Linux takes a mask value specifying a CPU
285 * affinity setting of a given task. If the mask value is 0x03, the given task
286 * will be executed on the first core (CPU0) or the second core (CPU1) on the
287 * given PM. The schedular will determine appropriate placements of tasks,
288 * considering given CPU affinities and task activities.
290 * How should the system formulate constraint problems for an affinity to
293 * The cpu argument must be the host where the task is being executed. The
294 * action object does not have the information about the location where the
295 * action is being executed.
297 void CpuAction::setAffinity(Cpu *cpu, unsigned long mask)
299 lmm_variable_t var_obj = getVariable();
300 XBT_IN("(%p,%lx)", this, mask);
303 unsigned long nbits = 0;
305 /* FIXME: There is much faster algorithms doing this. */
306 for (int i = 0; i < cpu->m_core; i++) {
307 unsigned long has_affinity = (1UL << i) & mask;
313 XBT_CRITICAL("Do not specify multiple cores for an affinity mask.");
314 XBT_CRITICAL("See the comment in cpu_action_set_affinity().");
319 for (int i = 0; i < cpu->m_core; i++) {
320 XBT_DEBUG("clear affinity %p to cpu-%d@%s", this, i, cpu->getName());
321 lmm_shrink(cpu->getModel()->getMaxminSystem(), cpu->p_constraintCore[i], var_obj);
323 unsigned long has_affinity = (1UL << i) & mask;
325 /* This function only accepts an affinity setting on the host where the
326 * task is now running. In future, a task might move to another host.
327 * But, at this moment, this function cannot take an affinity setting on
330 * It might be possible to extend the code to allow this function to
331 * accept affinity settings on a future host. We might be able to assign
332 * zero to elem->value to maintain such inactive affinity settings in the
333 * system. But, this will make the system complex. */
334 XBT_DEBUG("set affinity %p to cpu-%d@%s", this, i, cpu->getName());
335 lmm_expand(cpu->getModel()->getMaxminSystem(), cpu->p_constraintCore[i], var_obj, 1.0);
339 if (cpu->getModel()->getUpdateMechanism() == UM_LAZY) {
340 /* FIXME (hypervisor): Do we need to do something for the LAZY mode? */
345 void CpuAction::setState(e_surf_action_state_t state){
346 e_surf_action_state_t old = getState();
347 Action::setState(state);
348 surf_callback_emit(cpuActionStateChangedCallbacks, this, old, state);