1 /* Copyright (c) 2013-2014. 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"
9 XBT_LOG_EXTERNAL_CATEGORY(surf_kernel);
10 XBT_LOG_NEW_DEFAULT_SUBCATEGORY(surf_cpu, surf,
11 "Logging specific to the SURF cpu module");
13 int autoload_surf_cpu_model = 1;
14 void_f_void_t surf_cpu_model_init_preparse = NULL;
16 CpuModelPtr surf_cpu_model_pm;
17 CpuModelPtr surf_cpu_model_vm;
22 CpuPtr getActionCpu(CpuActionPtr action) {
23 return static_cast<CpuPtr>(lmm_constraint_id(lmm_get_cnst_from_var
24 (action->getModel()->getMaxminSystem(),
25 action->getVariable(), 0)));
28 surf_callback(void, CpuPtr) cpuCreatedCallbacks;
29 surf_callback(void, CpuPtr) cpuDestructedCallbacks;
30 surf_callback(void, CpuPtr, e_surf_resource_state_t, e_surf_resource_state_t) cpuStateChangedCallbacks;
31 surf_callback(void, CpuActionPtr, e_surf_action_state_t, e_surf_action_state_t) cpuActionStateChangedCallbacks;
33 void cpu_parse_init(sg_platf_host_cbarg_t host){
34 surf_cpu_model_pm->createCpu(
46 void cpu_add_traces(){
47 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<CpuActionPtr>(xbt_heap_pop(getActionHeap()));
59 XBT_CDEBUG(surf_kernel, "Something happened to action %p", action);
60 if (TRACE_is_enabled()) {
61 CpuPtr cpu = static_cast<CpuPtr>(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 ActionListPtr actionSet = getRunningActionSet();
81 for(ActionList::iterator it(actionSet->begin()), itend(actionSet->end())
82 ; it != itend ; ++it) {
83 action = static_cast<CpuActionPtr>(&*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 CpuActionPtr action = NULL;
102 ActionListPtr 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<CpuActionPtr>(&*it);
108 if (TRACE_is_enabled()) {
109 CpuPtr x = (CpuPtr) lmm_constraint_id(lmm_get_cnst_from_var
110 (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(ModelPtr 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(ModelPtr 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);
231 void CpuAction::updateRemainingLazy(double now)
235 xbt_assert(getStateSet() == getModel()->getRunningActionSet(),
236 "You're updating an action that is not running.");
238 /* bogus priority, skip it */
239 xbt_assert(getPriority() > 0,
240 "You're updating an action that seems suspended.");
242 delta = now - m_lastUpdate;
245 XBT_CDEBUG(surf_kernel, "Updating action(%p): remains was %f, last_update was: %f", this, m_remains, m_lastUpdate);
246 double_update(&(m_remains), m_lastValue * delta, sg_maxmin_precision*sg_surf_precision);
248 if (TRACE_is_enabled()) {
249 CpuPtr cpu = static_cast<CpuPtr>(lmm_constraint_id(lmm_get_cnst_from_var(getModel()->getMaxminSystem(), getVariable(), 0)));
250 TRACE_surf_host_set_utilization(cpu->getName(), getCategory(), m_lastValue, m_lastUpdate, now - m_lastUpdate);
252 XBT_CDEBUG(surf_kernel, "Updating action(%p): remains is now %f", this, m_remains);
256 m_lastValue = lmm_variable_getvalue(getVariable());
261 * This function formulates a constraint problem that pins a given task to
262 * particular cores. Currently, it is possible to pin a task to an exactly one
263 * specific core. The system links the variable object of the task to the
264 * per-core constraint object.
266 * But, the taskset command on Linux takes a mask value specifying a CPU
267 * affinity setting of a given task. If the mask value is 0x03, the given task
268 * will be executed on the first core (CPU0) or the second core (CPU1) on the
269 * given PM. The schedular will determine appropriate placements of tasks,
270 * considering given CPU affinities and task activities.
272 * How should the system formulate constraint problems for an affinity to
275 * The cpu argument must be the host where the task is being executed. The
276 * action object does not have the information about the location where the
277 * action is being executed.
279 void CpuAction::setAffinity(CpuPtr cpu, unsigned long mask)
281 lmm_variable_t var_obj = getVariable();
282 XBT_IN("(%p,%lx)", this, mask);
285 unsigned long nbits = 0;
287 /* FIXME: There is much faster algorithms doing this. */
288 for (int i = 0; i < cpu->m_core; i++) {
289 unsigned long has_affinity = (1UL << i) & mask;
295 XBT_CRITICAL("Do not specify multiple cores for an affinity mask.");
296 XBT_CRITICAL("See the comment in cpu_action_set_affinity().");
301 for (int i = 0; i < cpu->m_core; i++) {
302 XBT_DEBUG("clear affinity %p to cpu-%d@%s", this, i, cpu->getName());
303 lmm_shrink(cpu->getModel()->getMaxminSystem(), cpu->p_constraintCore[i], var_obj);
305 unsigned long has_affinity = (1UL << i) & mask;
307 /* This function only accepts an affinity setting on the host where the
308 * task is now running. In future, a task might move to another host.
309 * But, at this moment, this function cannot take an affinity setting on
312 * It might be possible to extend the code to allow this function to
313 * accept affinity settings on a future host. We might be able to assign
314 * zero to elem->value to maintain such inactive affinity settings in the
315 * system. But, this will make the system complex. */
316 XBT_DEBUG("set affinity %p to cpu-%d@%s", this, i, cpu->getName());
317 lmm_expand(cpu->getModel()->getMaxminSystem(), cpu->p_constraintCore[i], var_obj, 1.0);
321 if (cpu->getModel()->getUpdateMechanism() == UM_LAZY) {
322 /* FIXME (hypervisor): Do we need to do something for the LAZY mode? */
327 void CpuAction::setState(e_surf_action_state_t state){
328 e_surf_action_state_t old = getState();
329 Action::setState(state);
330 surf_callback_emit(cpuActionStateChangedCallbacks, this, old, state);