+
+ dynar = src->tasks_after;
+ length = xbt_dynar_length(dynar);
+
+ for (i = 0; i < length && !found; i++) {
+ xbt_dynar_get_cpy(dynar, i, &dependency);
+ found = (dependency->dst == dst);
+ }
+ if (!found)
+ THROW2(arg_error, 0, "No dependency found between task '%s' and '%s'",
+ SD_task_get_name(src), SD_task_get_name(dst));
+ return dependency->data;
+}
+
+/* temporary function for debugging */
+static void __SD_print_watch_points(SD_task_t task)
+{
+ static const int state_masks[] =
+ { SD_SCHEDULED, SD_RUNNING, SD_READY, SD_DONE, SD_FAILED };
+ static const char *state_names[] =
+ { "scheduled", "running", "ready", "done", "failed" };
+ int i;
+
+ INFO2("Task '%s' watch points (%x): ", SD_task_get_name(task),
+ task->watch_points);
+
+
+ for (i = 0; i < 5; i++) {
+ if (task->watch_points & state_masks[i])
+ INFO1("%s ", state_names[i]);
+ }
+}
+
+/**
+ * \brief Adds a watch point to a task
+ *
+ * SD_simulate() will stop as soon as the \ref e_SD_task_state_t "state" of this
+ * task becomes the one given in argument. The
+ * watch point is then automatically removed.
+ *
+ * \param task a task
+ * \param state the \ref e_SD_task_state_t "state" you want to watch
+ * (cannot be #SD_NOT_SCHEDULED)
+ * \see SD_task_unwatch()
+ */
+void SD_task_watch(SD_task_t task, e_SD_task_state_t state)
+{
+ SD_CHECK_INIT_DONE();
+ xbt_assert0(task != NULL, "Invalid parameter");
+
+ if (state & SD_NOT_SCHEDULED)
+ THROW0(arg_error, 0,
+ "Cannot add a watch point for state SD_NOT_SCHEDULED");
+
+ task->watch_points = task->watch_points | state;
+ /* __SD_print_watch_points(task); */
+}
+
+/**
+ * \brief Removes a watch point from a task
+ *
+ * \param task a task
+ * \param state the \ref e_SD_task_state_t "state" you no longer want to watch
+ * \see SD_task_watch()
+ */
+void SD_task_unwatch(SD_task_t task, e_SD_task_state_t state)
+{
+ SD_CHECK_INIT_DONE();
+ xbt_assert0(task != NULL, "Invalid parameter");
+ xbt_assert0(state != SD_NOT_SCHEDULED,
+ "SimDag error: Cannot have a watch point for state SD_NOT_SCHEDULED");
+
+ task->watch_points = task->watch_points & ~state;
+ /* __SD_print_watch_points(task); */
+}
+
+/**
+ * \brief Returns an approximative estimation of the execution time of a task.
+ *
+ * The estimation is very approximative because the value returned is the time
+ * the task would take if it was executed now and if it was the only task.
+ *
+ * \param task the task to evaluate
+ * \param workstation_nb number of workstations on which the task would be executed
+ * \param workstation_list the workstations on which the task would be executed
+ * \param computation_amount computation amount for each workstation
+ * \param communication_amount communication amount between each pair of workstations
+ * \param rate task execution speed rate
+ * \see SD_schedule()
+ */
+double SD_task_get_execution_time(SD_task_t task,
+ int workstation_nb,
+ const SD_workstation_t * workstation_list,
+ const double *computation_amount,
+ const double *communication_amount,
+ double rate)
+{
+ double time, max_time = 0.0;
+ int i, j;
+ SD_CHECK_INIT_DONE();
+ xbt_assert0(task != NULL && workstation_nb > 0 && workstation_list != NULL
+ && computation_amount != NULL
+ && communication_amount != NULL, "Invalid parameter");
+
+ /* the task execution time is the maximum execution time of the parallel tasks */
+
+ for (i = 0; i < workstation_nb; i++) {
+ time =
+ SD_workstation_get_computation_time(workstation_list[i],
+ computation_amount[i]);
+
+ for (j = 0; j < workstation_nb; j++) {
+ time +=
+ SD_route_get_communication_time(workstation_list[i],
+ workstation_list[j],
+ communication_amount[i *
+ workstation_nb +
+ j]);
+ }
+
+ if (time > max_time) {
+ max_time = time;
+ }
+ }
+ return max_time * SD_task_get_amount(task);
+}
+
+/**
+ * \brief Schedules a task
+ *
+ * The task state must be #SD_NOT_SCHEDULED.
+ * Once scheduled, a task will be executed as soon as possible in SD_simulate(),
+ * i.e. when its dependencies are satisfied.
+ *
+ * \param task the task you want to schedule
+ * \param workstation_nb number of workstations on which the task will be executed
+ * \param workstation_list the workstations on which the task will be executed
+ * \param computation_amount computation amount for each workstation
+ * \param communication_amount communication amount between each pair of workstations
+ * \param rate task execution speed rate
+ * \see SD_task_unschedule()
+ */
+void SD_task_schedule(SD_task_t task, int workstation_nb,
+ const SD_workstation_t * workstation_list,
+ const double *computation_amount,
+ const double *communication_amount, double rate)
+{
+
+ int communication_nb;
+
+ SD_CHECK_INIT_DONE();
+ xbt_assert0(task != NULL, "Invalid parameter");
+ xbt_assert0(workstation_nb > 0, "workstation_nb must be positive");
+
+ if (!__SD_task_is_not_scheduled(task))
+ THROW1(arg_error, 0, "Task '%s' has already been scheduled",
+ SD_task_get_name(task));
+
+ task->workstation_nb = workstation_nb;
+ task->rate = rate;
+
+ task->computation_amount = xbt_new(double, workstation_nb);
+ memcpy(task->computation_amount, computation_amount,
+ sizeof(double) * workstation_nb);
+
+ communication_nb = workstation_nb * workstation_nb;
+ task->communication_amount = xbt_new(double, communication_nb);
+ memcpy(task->communication_amount, communication_amount,
+ sizeof(double) * communication_nb);
+
+ task->workstation_list = xbt_new(SD_workstation_t, workstation_nb);
+ memcpy(task->workstation_list, workstation_list,
+ sizeof(SD_workstation_t) * workstation_nb);
+
+ /* update the task state */
+ if (xbt_dynar_length(task->tasks_before) == 0)
+ __SD_task_set_state(task, SD_READY);
+ else
+ __SD_task_set_state(task, SD_SCHEDULED);
+}
+
+/**
+ * \brief Unschedules a task
+ *
+ * The task state must be #SD_SCHEDULED, #SD_READY, #SD_RUNNING or #SD_FAILED.
+ * If you call this function, the task state becomes #SD_NOT_SCHEDULED.
+ * Call SD_task_schedule() to schedule it again.
+ *
+ * \param task the task you want to unschedule
+ * \see SD_task_schedule()
+ */
+void SD_task_unschedule(SD_task_t task)
+{
+ SD_CHECK_INIT_DONE();
+ xbt_assert0(task != NULL, "Invalid parameter");
+
+ if (task->state_set != sd_global->scheduled_task_set &&
+ task->state_set != sd_global->ready_task_set &&
+ task->state_set != sd_global->running_task_set &&
+ task->state_set != sd_global->failed_task_set)
+ THROW1(arg_error, 0,
+ "Task %s: the state must be SD_SCHEDULED, SD_READY, SD_RUNNING or SD_FAILED",
+ SD_task_get_name(task));
+
+ if (__SD_task_is_scheduled_or_ready(task)) /* if the task is scheduled or ready */
+ __SD_task_destroy_scheduling_data(task);
+
+ if (__SD_task_is_running(task)) /* the task should become SD_FAILED */
+ surf_workstation_model->action_cancel(task->surf_action);
+ else
+ __SD_task_set_state(task, SD_NOT_SCHEDULED);
+ task->remains = task->amount;
+ task->start_time = -1.0;
+}
+
+/* Destroys the data memorised by SD_task_schedule. Task state must be SD_SCHEDULED or SD_READY.
+ */
+static void __SD_task_destroy_scheduling_data(SD_task_t task)
+{
+ SD_CHECK_INIT_DONE();
+ if (!__SD_task_is_scheduled_or_ready(task) && !__SD_task_is_in_fifo(task))
+ THROW1(arg_error, 0,
+ "Task '%s' must be SD_SCHEDULED, SD_READY or SD_IN_FIFO",
+ SD_task_get_name(task));
+
+ xbt_free(task->computation_amount);
+ xbt_free(task->communication_amount);
+}
+
+/* Runs a task. This function is directly called by __SD_task_try_to_run if the task
+ * doesn't have to wait in fifos. Otherwise, it is called by __SD_task_just_done when
+ * the task gets out of its fifos.
+ */
+void __SD_task_really_run(SD_task_t task)
+{
+
+ int i;
+ void **surf_workstations;
+
+ SD_CHECK_INIT_DONE();
+ xbt_assert0(task != NULL, "Invalid parameter");
+ xbt_assert2(__SD_task_is_ready_or_in_fifo(task),
+ "Task '%s' is not ready or in a fifo! Task state: %d",
+ SD_task_get_name(task), SD_task_get_state(task));
+ xbt_assert1(task->workstation_list != NULL,
+ "Task '%s': workstation_list is NULL!", SD_task_get_name(task));
+
+
+
+ DEBUG1("Really running task '%s'", SD_task_get_name(task));
+
+ /* set this task as current task for the workstations in sequential mode */
+ for (i = 0; i < task->workstation_nb; i++) {
+ if (SD_workstation_get_access_mode(task->workstation_list[i]) ==
+ SD_WORKSTATION_SEQUENTIAL_ACCESS) {
+ task->workstation_list[i]->current_task = task;
+ xbt_assert0(__SD_workstation_is_busy(task->workstation_list[i]),
+ "The workstation should be busy now");
+ }
+ }
+
+ DEBUG1("Task '%s' set as current task for its workstations",
+ SD_task_get_name(task));
+
+ /* start the task */
+
+ /* we have to create a Surf workstation array instead of the SimDag workstation array */
+ surf_workstations = xbt_new(void *, task->workstation_nb);
+
+ for (i = 0; i < task->workstation_nb; i++) {
+ surf_workstations[i] = task->workstation_list[i]->surf_workstation;
+ }
+
+ task->surf_action = NULL;
+ if ((task->workstation_nb == 1) && (task->communication_amount[0] == 0.0)) {
+ task->surf_action =
+ surf_workstation_model->extension.
+ workstation.execute(surf_workstations[0], task->computation_amount[0]);
+ } else if ((task->workstation_nb == 1)
+ && (task->computation_amount[0] == 0.0)) {
+ task->surf_action =
+ surf_workstation_model->extension.
+ workstation.communicate(surf_workstations[0], surf_workstations[0],
+ task->communication_amount[0], task->rate);
+ } else if ((task->workstation_nb == 2)
+ && (task->computation_amount[0] == 0.0)
+ && (task->computation_amount[1] == 0.0)) {
+ int nb = 0;
+ double value = 0.0;
+
+ for (i = 0; i < task->workstation_nb * task->workstation_nb; i++) {
+ if (task->communication_amount[i] > 0.0) {
+ nb++;
+ value = task->communication_amount[i];
+ }
+ }
+ if (nb == 1) {
+ task->surf_action =
+ surf_workstation_model->extension.
+ workstation.communicate(surf_workstations[0], surf_workstations[1],
+ value, task->rate);
+ }
+ }
+ if (!task->surf_action) {
+ double *computation_amount = xbt_new(double, task->workstation_nb);
+ double *communication_amount = xbt_new(double, task->workstation_nb *
+ task->workstation_nb);
+
+ memcpy(computation_amount, task->computation_amount, sizeof(double) *
+ task->workstation_nb);
+ memcpy(communication_amount, task->communication_amount,
+ sizeof(double) * task->workstation_nb * task->workstation_nb);
+
+ task->surf_action =
+ surf_workstation_model->extension.
+ workstation.execute_parallel_task(task->workstation_nb,
+ surf_workstations, computation_amount,
+ communication_amount, task->amount,
+ task->rate);
+ } else {
+ xbt_free(surf_workstations);
+ }
+
+ surf_workstation_model->action_data_set(task->surf_action, task);
+
+ DEBUG1("surf_action = %p", task->surf_action);
+
+ __SD_task_destroy_scheduling_data(task); /* now the scheduling data are not useful anymore */
+ __SD_task_set_state(task, SD_RUNNING);
+ xbt_assert2(__SD_task_is_running(task), "Bad state of task '%s': %d",
+ SD_task_get_name(task), SD_task_get_state(task));
+
+}
+
+/* Tries to run a task. This function is called by SD_simulate() when a scheduled task becomes SD_READY
+ * (ie when its dependencies are satisfied).
+ * If one of the workstations where the task is scheduled on is busy (in sequential mode),
+ * the task doesn't start.
+ * Returns whether the task has started.
+ */
+int __SD_task_try_to_run(SD_task_t task)
+{
+
+ int can_start = 1;
+ int i;
+ SD_workstation_t workstation;
+
+ SD_CHECK_INIT_DONE();
+ xbt_assert0(task != NULL, "Invalid parameter");
+ xbt_assert2(__SD_task_is_ready(task),
+ "Task '%s' is not ready! Task state: %d",
+ SD_task_get_name(task), SD_task_get_state(task));
+
+
+ for (i = 0; i < task->workstation_nb; i++) {
+ can_start = !__SD_workstation_is_busy(task->workstation_list[i]);
+ }
+
+ DEBUG2("Task '%s' can start: %d", SD_task_get_name(task), can_start);
+
+ if (!can_start) { /* if the task cannot start and is not in the fifos yet */
+ for (i = 0; i < task->workstation_nb; i++) {
+ workstation = task->workstation_list[i];
+ if (workstation->access_mode == SD_WORKSTATION_SEQUENTIAL_ACCESS) {
+ DEBUG2("Pushing task '%s' in the fifo of workstation '%s'",
+ SD_task_get_name(task), SD_workstation_get_name(workstation));
+ xbt_fifo_push(workstation->task_fifo, task);
+ }
+ }
+ __SD_task_set_state(task, SD_IN_FIFO);
+ xbt_assert2(__SD_task_is_in_fifo(task), "Bad state of task '%s': %d",
+ SD_task_get_name(task), SD_task_get_state(task));
+ DEBUG1("Task '%s' state is now SD_IN_FIFO", SD_task_get_name(task));
+ } else {
+ __SD_task_really_run(task);
+ }
+
+ return can_start;