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::Extension<simgrid::Host, Cpu> Cpu::EXTENSION_ID;
27 if (!EXTENSION_ID.valid())
28 EXTENSION_ID = simgrid::Host::extension_create<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 simgrid::surf::signal<void(CpuAction*, e_surf_action_state_t, e_surf_action_state_t)> cpuActionStateChangedCallbacks;
43 void cpu_add_traces(){
44 surf_cpu_model_pm->addTraces();
51 void CpuModel::updateActionsStateLazy(double now, double /*delta*/)
54 while ((xbt_heap_size(getActionHeap()) > 0)
55 && (double_equals(xbt_heap_maxkey(getActionHeap()), now, sg_surf_precision))) {
56 action = static_cast<CpuAction*>(xbt_heap_pop(getActionHeap()));
57 XBT_CDEBUG(surf_kernel, "Something happened to action %p", action);
58 if (TRACE_is_enabled()) {
59 Cpu *cpu = static_cast<Cpu*>(lmm_constraint_id(lmm_get_cnst_from_var(getMaxminSystem(), action->getVariable(), 0)));
60 TRACE_surf_host_set_utilization(cpu->getName(), action->getCategory(),
61 lmm_variable_getvalue(action->getVariable()),
62 action->getLastUpdate(),
63 now - action->getLastUpdate());
67 XBT_CDEBUG(surf_kernel, "Action %p finished", action);
69 /* set the remains to 0 due to precision problems when updating the remaining amount */
70 action->setRemains(0);
71 action->setState(SURF_ACTION_DONE);
72 action->heapRemove(getActionHeap()); //FIXME: strange call since action was already popped
74 if (TRACE_is_enabled()) {
75 //defining the last timestamp that we can safely dump to trace file
76 //without losing the event ascending order (considering all CPU's)
78 ActionList *actionSet = getRunningActionSet();
79 for(ActionList::iterator it(actionSet->begin()), itend(actionSet->end())
80 ; it != itend ; ++it) {
81 action = static_cast<CpuAction*>(&*it);
83 smaller = action->getLastUpdate();
86 if (action->getLastUpdate() < smaller) {
87 smaller = action->getLastUpdate();
91 TRACE_last_timestamp_to_dump = smaller;
97 void CpuModel::updateActionsStateFull(double now, double delta)
99 CpuAction *action = NULL;
100 ActionList *running_actions = getRunningActionSet();
102 for(ActionList::iterator it(running_actions->begin()), itNext=it, itend(running_actions->end())
103 ; it != itend ; it=itNext) {
105 action = static_cast<CpuAction*>(&*it);
106 if (TRACE_is_enabled()) {
107 Cpu *x = static_cast<Cpu*> (lmm_constraint_id(lmm_get_cnst_from_var(getMaxminSystem(), action->getVariable(), 0)) );
109 TRACE_surf_host_set_utilization(x->getName(),
110 action->getCategory(),
111 lmm_variable_getvalue(action->getVariable()),
114 TRACE_last_timestamp_to_dump = now - delta;
117 action->updateRemains(lmm_variable_getvalue(action->getVariable()) * delta);
120 if (action->getMaxDuration() != NO_MAX_DURATION)
121 action->updateMaxDuration(delta);
124 if ((action->getRemainsNoUpdate() <= 0) &&
125 (lmm_get_variable_weight(action->getVariable()) > 0)) {
127 action->setState(SURF_ACTION_DONE);
128 } else if ((action->getMaxDuration() != NO_MAX_DURATION) &&
129 (action->getMaxDuration() <= 0)) {
131 action->setState(SURF_ACTION_DONE);
146 Cpu::Cpu(Model *model, const char *name,
147 int core, double speedPeak, double speedScale,
148 e_surf_resource_state_t stateInitial)
149 : Resource(model, name, stateInitial)
151 , m_speedPeak(speedPeak)
152 , m_speedScale(speedScale)
157 Cpu::Cpu(Model *model, const char *name,
158 lmm_constraint_t constraint, int core, double speedPeak,
159 double speedScale, e_surf_resource_state_t stateInitial)
160 : Resource(model, name, constraint, stateInitial)
162 , m_speedPeak(speedPeak)
163 , m_speedScale(speedScale)
165 /* At now, we assume that a VM does not have a multicore CPU. */
167 xbt_assert(model == surf_cpu_model_pm);
169 if (model->getUpdateMechanism() != UM_UNDEFINED) {
170 p_constraintCore = xbt_new(lmm_constraint_t, core);
171 p_constraintCoreId = xbt_new(void*, core);
174 for (i = 0; i < core; i++) {
175 /* just for a unique id, never used as a string. */
176 p_constraintCoreId[i] = bprintf("%s:%i", name, i);
177 p_constraintCore[i] = lmm_constraint_new(model->getMaxminSystem(), p_constraintCoreId[i], m_speedScale * m_speedPeak);
182 Cpu::Cpu(Model *model, const char *name,
183 lmm_constraint_t constraint, int core, double speedPeak, double speedScale)
184 : Cpu(model, name, constraint, core, speedPeak, speedScale, SURF_RESOURCE_ON)
187 Cpu::Cpu(Model *model, const char *name,
188 int core, double speedPeak, double speedScale)
189 : Cpu(model, name, core, speedPeak, speedScale, SURF_RESOURCE_ON)
194 if (p_constraintCoreId){
195 for (int i = 0; i < m_core; i++) {
196 xbt_free(p_constraintCoreId[i]);
198 xbt_free(p_constraintCore);
200 if (p_constraintCoreId)
201 xbt_free(p_constraintCoreId);
204 double Cpu::getCurrentPowerPeak()
209 double Cpu::getSpeed(double load)
211 return load * m_speedPeak;
214 double Cpu::getAvailableSpeed()
216 /* number between 0 and 1 */
225 void Cpu::plug(simgrid::Host* host)
227 if (this->m_host != nullptr)
228 xbt_die("Already plugged into host %s", host->getName().c_str());
229 host->extension_set(this);
237 void CpuAction::updateRemainingLazy(double now)
241 xbt_assert(getStateSet() == getModel()->getRunningActionSet(),
242 "You're updating an action that is not running.");
244 /* bogus priority, skip it */
245 xbt_assert(getPriority() > 0,
246 "You're updating an action that seems suspended.");
248 delta = now - m_lastUpdate;
251 XBT_CDEBUG(surf_kernel, "Updating action(%p): remains was %f, last_update was: %f", this, m_remains, m_lastUpdate);
252 double_update(&(m_remains), m_lastValue * delta, sg_maxmin_precision*sg_surf_precision);
254 if (TRACE_is_enabled()) {
255 Cpu *cpu = static_cast<Cpu*>(lmm_constraint_id(lmm_get_cnst_from_var(getModel()->getMaxminSystem(), getVariable(), 0)));
256 TRACE_surf_host_set_utilization(cpu->getName(), getCategory(), m_lastValue, m_lastUpdate, now - m_lastUpdate);
258 XBT_CDEBUG(surf_kernel, "Updating action(%p): remains is now %f", this, m_remains);
262 m_lastValue = lmm_variable_getvalue(getVariable());
267 * This function formulates a constraint problem that pins a given task to
268 * particular cores. Currently, it is possible to pin a task to an exactly one
269 * specific core. The system links the variable object of the task to the
270 * per-core constraint object.
272 * But, the taskset command on Linux takes a mask value specifying a CPU
273 * affinity setting of a given task. If the mask value is 0x03, the given task
274 * will be executed on the first core (CPU0) or the second core (CPU1) on the
275 * given PM. The schedular will determine appropriate placements of tasks,
276 * considering given CPU affinities and task activities.
278 * How should the system formulate constraint problems for an affinity to
281 * The cpu argument must be the host where the task is being executed. The
282 * action object does not have the information about the location where the
283 * action is being executed.
285 void CpuAction::setAffinity(Cpu *cpu, unsigned long mask)
287 lmm_variable_t var_obj = getVariable();
288 XBT_IN("(%p,%lx)", this, mask);
291 unsigned long nbits = 0;
293 /* FIXME: There is much faster algorithms doing this. */
294 for (int i = 0; i < cpu->m_core; i++) {
295 unsigned long has_affinity = (1UL << i) & mask;
301 XBT_CRITICAL("Do not specify multiple cores for an affinity mask.");
302 XBT_CRITICAL("See the comment in cpu_action_set_affinity().");
307 for (int i = 0; i < cpu->m_core; 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::surf::signal<void(simgrid::surf::CpuAction*, e_surf_action_state_t, e_surf_action_state_t)> CpuAction::onStateChange;
335 void CpuAction::setState(e_surf_action_state_t state){
336 e_surf_action_state_t old = getState();
337 Action::setState(state);
338 onStateChange(this, old, state);