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 CpuModel *surf_cpu_model_pm;
18 CpuModel *surf_cpu_model_vm;
23 Cpu *getActionCpu(CpuAction *action) {
24 return static_cast<Cpu*>(lmm_constraint_id(lmm_get_cnst_from_var
25 (action->getModel()->getMaxminSystem(),
26 action->getVariable(), 0)));
29 surf_callback(void, Cpu*) cpuCreatedCallbacks;
30 surf_callback(void, Cpu*) cpuDestructedCallbacks;
31 surf_callback(void, Cpu*, e_surf_resource_state_t, e_surf_resource_state_t) cpuStateChangedCallbacks;
32 surf_callback(void, CpuAction*, e_surf_action_state_t, e_surf_action_state_t) cpuActionStateChangedCallbacks;
34 void cpu_parse_init(sg_platf_host_cbarg_t host){
35 surf_cpu_model_pm->createCpu(
47 void cpu_add_traces(){
48 surf_cpu_model_pm->addTraces();
54 void CpuModel::updateActionsStateLazy(double now, double /*delta*/)
57 while ((xbt_heap_size(getActionHeap()) > 0)
58 && (double_equals(xbt_heap_maxkey(getActionHeap()), now, sg_surf_precision))) {
59 action = static_cast<CpuAction*>(xbt_heap_pop(getActionHeap()));
60 XBT_CDEBUG(surf_kernel, "Something happened to action %p", action);
61 if (TRACE_is_enabled()) {
62 Cpu *cpu = static_cast<Cpu*>(lmm_constraint_id(lmm_get_cnst_from_var(getMaxminSystem(), action->getVariable(), 0)));
63 TRACE_surf_host_set_utilization(cpu->getName(), action->getCategory(),
64 lmm_variable_getvalue(action->getVariable()),
65 action->getLastUpdate(),
66 now - action->getLastUpdate());
70 XBT_CDEBUG(surf_kernel, "Action %p finished", action);
72 /* set the remains to 0 due to precision problems when updating the remaining amount */
73 action->setRemains(0);
74 action->setState(SURF_ACTION_DONE);
75 action->heapRemove(getActionHeap()); //FIXME: strange call since action was already popped
77 if (TRACE_is_enabled()) {
78 //defining the last timestamp that we can safely dump to trace file
79 //without losing the event ascending order (considering all CPU's)
81 ActionList *actionSet = getRunningActionSet();
82 for(ActionList::iterator it(actionSet->begin()), itend(actionSet->end())
83 ; it != itend ; ++it) {
84 action = static_cast<CpuAction*>(&*it);
86 smaller = action->getLastUpdate();
89 if (action->getLastUpdate() < smaller) {
90 smaller = action->getLastUpdate();
94 TRACE_last_timestamp_to_dump = smaller;
100 void CpuModel::updateActionsStateFull(double now, double delta)
102 CpuAction *action = NULL;
103 ActionList *running_actions = getRunningActionSet();
105 for(ActionList::iterator it(running_actions->begin()), itNext=it, itend(running_actions->end())
106 ; it != itend ; it=itNext) {
108 action = static_cast<CpuAction*>(&*it);
109 if (TRACE_is_enabled()) {
110 Cpu *x = static_cast<Cpu*> (lmm_constraint_id(lmm_get_cnst_from_var(getMaxminSystem(), action->getVariable(), 0)) );
112 TRACE_surf_host_set_utilization(x->getName(),
113 action->getCategory(),
114 lmm_variable_getvalue(action->getVariable()),
117 TRACE_last_timestamp_to_dump = now - delta;
120 action->updateRemains(lmm_variable_getvalue(action->getVariable()) * delta);
123 if (action->getMaxDuration() != NO_MAX_DURATION)
124 action->updateMaxDuration(delta);
127 if ((action->getRemainsNoUpdate() <= 0) &&
128 (lmm_get_variable_weight(action->getVariable()) > 0)) {
130 action->setState(SURF_ACTION_DONE);
131 } else if ((action->getMaxDuration() != NO_MAX_DURATION) &&
132 (action->getMaxDuration() <= 0)) {
134 action->setState(SURF_ACTION_DONE);
146 surf_callback_emit(cpuCreatedCallbacks, this);
149 Cpu::Cpu(Model *model, const char *name, xbt_dict_t props,
150 int core, double powerPeak, double powerScale)
151 : Resource(model, name, props)
153 , m_powerPeak(powerPeak)
154 , m_powerScale(powerScale)
155 , p_constraintCore(NULL)
156 , p_constraintCoreId(NULL)
158 surf_callback_emit(cpuCreatedCallbacks, this);
161 Cpu::Cpu(Model *model, const char *name, xbt_dict_t props,
162 lmm_constraint_t constraint, int core, double powerPeak, double powerScale)
163 : Resource(model, name, props, constraint)
165 , m_powerPeak(powerPeak)
166 , m_powerScale(powerScale)
168 surf_callback_emit(cpuCreatedCallbacks, this);
169 /* At now, we assume that a VM does not have a multicore CPU. */
171 xbt_assert(model == surf_cpu_model_pm);
173 p_constraintCore = NULL;
174 p_constraintCoreId = NULL;
175 if (model->getUpdateMechanism() != UM_UNDEFINED) {
176 p_constraintCore = xbt_new(lmm_constraint_t, core);
177 p_constraintCoreId = xbt_new(void*, core);
180 for (i = 0; i < core; i++) {
181 /* just for a unique id, never used as a string. */
182 p_constraintCoreId[i] = bprintf("%s:%i", name, i);
183 p_constraintCore[i] = lmm_constraint_new(model->getMaxminSystem(), p_constraintCoreId[i], m_powerScale * m_powerPeak);
189 surf_callback_emit(cpuDestructedCallbacks, this);
190 if (p_constraintCoreId){
191 for (int i = 0; i < m_core; i++) {
192 xbt_free(p_constraintCoreId[i]);
194 xbt_free(p_constraintCore);
196 if (p_constraintCoreId)
197 xbt_free(p_constraintCoreId);
200 double Cpu::getCurrentPowerPeak()
205 double Cpu::getSpeed(double load)
207 return load * m_powerPeak;
210 double Cpu::getAvailableSpeed()
212 /* number between 0 and 1 */
221 void Cpu::setState(e_surf_resource_state_t state)
223 e_surf_resource_state_t old = Resource::getState();
224 Resource::setState(state);
225 surf_callback_emit(cpuStateChangedCallbacks, this, old, state);
232 void CpuAction::updateRemainingLazy(double now)
236 xbt_assert(getStateSet() == getModel()->getRunningActionSet(),
237 "You're updating an action that is not running.");
239 /* bogus priority, skip it */
240 xbt_assert(getPriority() > 0,
241 "You're updating an action that seems suspended.");
243 delta = now - m_lastUpdate;
246 XBT_CDEBUG(surf_kernel, "Updating action(%p): remains was %f, last_update was: %f", this, m_remains, m_lastUpdate);
247 double_update(&(m_remains), m_lastValue * delta, sg_maxmin_precision*sg_surf_precision);
249 if (TRACE_is_enabled()) {
250 Cpu *cpu = static_cast<Cpu*>(lmm_constraint_id(lmm_get_cnst_from_var(getModel()->getMaxminSystem(), getVariable(), 0)));
251 TRACE_surf_host_set_utilization(cpu->getName(), getCategory(), m_lastValue, m_lastUpdate, now - m_lastUpdate);
253 XBT_CDEBUG(surf_kernel, "Updating action(%p): remains is now %f", this, m_remains);
257 m_lastValue = lmm_variable_getvalue(getVariable());
262 * This function formulates a constraint problem that pins a given task to
263 * particular cores. Currently, it is possible to pin a task to an exactly one
264 * specific core. The system links the variable object of the task to the
265 * per-core constraint object.
267 * But, the taskset command on Linux takes a mask value specifying a CPU
268 * affinity setting of a given task. If the mask value is 0x03, the given task
269 * will be executed on the first core (CPU0) or the second core (CPU1) on the
270 * given PM. The schedular will determine appropriate placements of tasks,
271 * considering given CPU affinities and task activities.
273 * How should the system formulate constraint problems for an affinity to
276 * The cpu argument must be the host where the task is being executed. The
277 * action object does not have the information about the location where the
278 * action is being executed.
280 void CpuAction::setAffinity(Cpu *cpu, unsigned long mask)
282 lmm_variable_t var_obj = getVariable();
283 XBT_IN("(%p,%lx)", this, mask);
286 unsigned long nbits = 0;
288 /* FIXME: There is much faster algorithms doing this. */
289 for (int i = 0; i < cpu->m_core; i++) {
290 unsigned long has_affinity = (1UL << i) & mask;
296 XBT_CRITICAL("Do not specify multiple cores for an affinity mask.");
297 XBT_CRITICAL("See the comment in cpu_action_set_affinity().");
302 for (int i = 0; i < cpu->m_core; i++) {
303 XBT_DEBUG("clear affinity %p to cpu-%d@%s", this, i, cpu->getName());
304 lmm_shrink(cpu->getModel()->getMaxminSystem(), cpu->p_constraintCore[i], var_obj);
306 unsigned long has_affinity = (1UL << i) & mask;
308 /* This function only accepts an affinity setting on the host where the
309 * task is now running. In future, a task might move to another host.
310 * But, at this moment, this function cannot take an affinity setting on
313 * It might be possible to extend the code to allow this function to
314 * accept affinity settings on a future host. We might be able to assign
315 * zero to elem->value to maintain such inactive affinity settings in the
316 * system. But, this will make the system complex. */
317 XBT_DEBUG("set affinity %p to cpu-%d@%s", this, i, cpu->getName());
318 lmm_expand(cpu->getModel()->getMaxminSystem(), cpu->p_constraintCore[i], var_obj, 1.0);
322 if (cpu->getModel()->getUpdateMechanism() == UM_LAZY) {
323 /* FIXME (hypervisor): Do we need to do something for the LAZY mode? */
328 void CpuAction::setState(e_surf_action_state_t state){
329 e_surf_action_state_t old = getState();
330 Action::setState(state);
331 surf_callback_emit(cpuActionStateChangedCallbacks, this, old, state);