-/* Copyright (c) 2006, 2007, 2008, 2009, 2010. The SimGrid Team.
+/* Copyright (c) 2006, 2007, 2008, 2009, 2010, 2011. The SimGrid Team.
* All rights reserved. */
/* This program is free software; you can redistribute it and/or modify it
#include "simdag/simdag.h"
#include "xbt/sysdep.h"
#include "xbt/dynar.h"
-#include "instr/private.h"
+#include "instr/instr_private.h"
XBT_LOG_NEW_DEFAULT_SUBCATEGORY(sd_task, sd,
"Logging specific to SimDag (task)");
static void __SD_task_remove_dependencies(SD_task_t task);
static void __SD_task_destroy_scheduling_data(SD_task_t task);
-/**
- * \brief Creates a new task.
- *
- * \param name the name of the task (can be \c NULL)
- * \param data the user data you want to associate with the task (can be \c NULL)
- * \param amount amount of the task
- * \return the new task
- * \see SD_task_destroy()
- */
-SD_task_t SD_task_create(const char *name, void *data, double amount)
+void* SD_task_new_f(void)
{
+ SD_task_t task = xbt_new0(s_SD_task_t, 1);
+ task->tasks_before = xbt_dynar_new(sizeof(SD_dependency_t), NULL);
+ task->tasks_after = xbt_dynar_new(sizeof(SD_dependency_t), NULL);
- SD_task_t task;
- SD_CHECK_INIT_DONE();
+ return task;
+}
- task = xbt_new(s_SD_task_t, 1);
+void SD_task_recycle_f(void *t)
+{
+ SD_task_t task = (SD_task_t) t;
- /* general information */
- task->data = data; /* user data */
- task->name = xbt_strdup(name);
+ /* Reset the content */
task->kind = SD_TASK_NOT_TYPED;
task->state_hookup.prev = NULL;
task->state_hookup.next = NULL;
task->state_set = sd_global->not_scheduled_task_set;
- task->state = SD_NOT_SCHEDULED;
xbt_swag_insert(task, task->state_set);
+ task->state = SD_NOT_SCHEDULED;
+ task->return_hookup.prev = NULL;
+ task->return_hookup.next = NULL;
+
+ task->marked = 0;
- task->amount = amount;
- task->remains = amount;
task->start_time = -1.0;
task->finish_time = -1.0;
task->surf_action = NULL;
task->watch_points = 0;
/* dependencies */
- task->tasks_before = xbt_dynar_new(sizeof(SD_dependency_t), NULL);
- task->tasks_after = xbt_dynar_new(sizeof(SD_dependency_t), NULL);
+ xbt_dynar_reset(task->tasks_before);
+ xbt_dynar_reset(task->tasks_after);
task->unsatisfied_dependencies = 0;
task->is_not_ready = 0;
task->computation_amount = NULL;
task->communication_amount = NULL;
task->rate = -1;
+}
+
+void SD_task_free_f(void *t)
+{
+ SD_task_t task = (SD_task_t)t;
+
+ xbt_dynar_free(&task->tasks_before);
+ xbt_dynar_free(&task->tasks_after);
+ xbt_free(task);
+}
+
+/**
+ * \brief Creates a new task.
+ *
+ * \param name the name of the task (can be \c NULL)
+ * \param data the user data you want to associate with the task (can be \c NULL)
+ * \param amount amount of the task
+ * \return the new task
+ * \see SD_task_destroy()
+ */
+SD_task_t SD_task_create(const char *name, void *data, double amount)
+{
+ SD_task_t task = xbt_mallocator_get(sd_global->task_mallocator);
+
+ /* general information */
+ task->data = data; /* user data */
+ task->name = xbt_strdup(name);
+ task->amount = amount;
+ task->remains = amount;
sd_global->task_number++;
#ifdef HAVE_TRACING
- TRACE_sd_task_create(task);
+ task->category = NULL;
#endif
return task;
}
+static XBT_INLINE SD_task_t SD_task_create_sized(const char *name,
+ void *data, double amount,
+ int ws_count)
+{
+ SD_task_t task = SD_task_create(name, data, amount);
+ task->communication_amount = xbt_new0(double, ws_count * ws_count);
+ task->computation_amount = xbt_new0(double, ws_count);
+ task->workstation_nb = ws_count;
+ task->workstation_list = xbt_new0(SD_workstation_t, ws_count);
+ return task;
+}
+
+/** @brief create a end-to-end communication task that can then be auto-scheduled
+ *
+ * Auto-scheduling mean that the task can be used with SD_task_schedulev(). This
+ * allows to specify the task costs at creation, and decouple them from the
+ * scheduling process where you just specify which resource should deliver the
+ * mandatory power.
+ *
+ * A end-to-end communication must be scheduled on 2 hosts, and the amount
+ * specified at creation is sent from hosts[0] to hosts[1].
+ */
+SD_task_t SD_task_create_comm_e2e(const char *name, void *data,
+ double amount)
+{
+ SD_task_t res = SD_task_create_sized(name, data, amount, 2);
+ res->communication_amount[2] = amount;
+ res->kind = SD_TASK_COMM_E2E;
+ return res;
+}
+
+/** @brief create a sequential computation task that can then be auto-scheduled
+ *
+ * Auto-scheduling mean that the task can be used with SD_task_schedulev(). This
+ * allows to specify the task costs at creation, and decouple them from the
+ * scheduling process where you just specify which resource should deliver the
+ * mandatory power.
+ *
+ * A sequential computation must be scheduled on 1 host, and the amount
+ * specified at creation to be run on hosts[0].
+ *
+ * \param name the name of the task (can be \c NULL)
+ * \param data the user data you want to associate with the task (can be \c NULL)
+ * \param amount amount of compute work to be done by the task
+ * \return the new SD_TASK_COMP_SEQ typed task
+ */
+SD_task_t SD_task_create_comp_seq(const char *name, void *data,
+ double amount)
+{
+ SD_task_t res = SD_task_create_sized(name, data, amount, 1);
+ res->computation_amount[0] = amount;
+ res->kind = SD_TASK_COMP_SEQ;
+ return res;
+}
+
+/** @brief create a parallel computation task that can then be auto-scheduled
+ *
+ * Auto-scheduling mean that the task can be used with SD_task_schedulev(). This
+ * allows to specify the task costs at creation, and decouple them from the
+ * scheduling process where you just specify which resource should deliver the
+ * mandatory power.
+ *
+ * A parallel computation can be scheduled on any number of host.
+ * The underlying speedup model is Amdahl's law.
+ * To be auto-scheduled, \see SD_task_distribute_comp_amdhal has to be called
+ * first.
+ * \param name the name of the task (can be \c NULL)
+ * \param data the user data you want to associate with the task (can be \c NULL)
+ * \param amount amount of compute work to be done by the task
+ * \param alpha purely serial fraction of the work to be done (in [0.;1.[)
+ * \return the new task
+ */
+SD_task_t SD_task_create_comp_par_amdahl(const char *name, void *data,
+ double amount, double alpha)
+{
+ xbt_assert(alpha < 1. && alpha >= 0.,
+ "Invalid parameter: alpha must be in [0.;1.[");
+
+ SD_task_t res = SD_task_create(name, data, amount);
+ res->alpha = alpha;
+ res->kind = SD_TASK_COMP_PAR_AMDAHL;
+ return res;
+}
+
+/** @brief create a complex data redistribution task that can then be
+ * auto-scheduled
+ *
+ * Auto-scheduling mean that the task can be used with SD_task_schedulev().
+ * This allows to specify the task costs at creation, and decouple them from
+ * the scheduling process where you just specify which resource should
+ * communicate.
+ *
+ * A data redistribution can be scheduled on any number of host.
+ * The assumed distribution is a 1D block distribution. Each host owns the same
+ * share of the \see amount.
+ * To be auto-scheduled, \see SD_task_distribute_comm_mxn_1d_block has to be
+ * called first.
+ * \param name the name of the task (can be \c NULL)
+ * \param data the user data you want to associate with the task (can be
+ * \c NULL)
+ * \param amount amount of data to redistribute by the task
+ * \return the new task
+ */
+SD_task_t SD_task_create_comm_par_mxn_1d_block(const char *name, void *data,
+ double amount)
+{
+ SD_task_t res = SD_task_create(name, data, amount);
+ res->workstation_list=NULL;
+ res->kind = SD_TASK_COMM_PAR_MXN_1D_BLOCK;
+ return res;
+}
+
+/**
+ * \brief Destroys a task.
+ *
+ * The user data (if any) should have been destroyed first.
+ *
+ * \param task the task you want to destroy
+ * \see SD_task_create()
+ */
+void SD_task_destroy(SD_task_t task)
+{
+ XBT_DEBUG("Destroying task %s...", SD_task_get_name(task));
+
+ __SD_task_remove_dependencies(task);
+ /* if the task was scheduled or runnable we have to free the scheduling parameters */
+ if (__SD_task_is_scheduled_or_runnable(task))
+ __SD_task_destroy_scheduling_data(task);
+ if (task->state_set != NULL) /* would be null if just created */
+ xbt_swag_remove(task, task->state_set);
+
+ xbt_swag_remove(task, sd_global->return_set);
+
+ xbt_free(task->name);
+
+ if (task->surf_action != NULL)
+ surf_workstation_model->action_unref(task->surf_action);
+
+ xbt_free(task->workstation_list);
+ xbt_free(task->communication_amount);
+ xbt_free(task->computation_amount);
+
+ xbt_mallocator_release(sd_global->task_mallocator,task);
+ sd_global->task_number--;
+
+#ifdef HAVE_TRACING
+ if (task->category) xbt_free(task->category);
+#endif
+
+ XBT_DEBUG("Task destroyed.");
+}
+
/**
* \brief Returns the user data of a task
*
*/
void *SD_task_get_data(SD_task_t task)
{
- SD_CHECK_INIT_DONE();
- xbt_assert0(task != NULL, "Invalid parameter");
return task->data;
}
*/
void SD_task_set_data(SD_task_t task, void *data)
{
- SD_CHECK_INIT_DONE();
- xbt_assert0(task != NULL, "Invalid parameter");
task->data = data;
}
+/**
+ * \brief Sets the rate of a task
+ *
+ * This will change the percentage of the available power or network bandwidth
+ * a task can use.
+ *
+ * \param task a task
+ * \param rate the new rate you want to associate with this task
+ */
+void SD_task_set_rate(SD_task_t task, double rate)
+{
+ task->rate = rate;
+}
+
/**
* \brief Returns the state of a task
*
*/
e_SD_task_state_t SD_task_get_state(SD_task_t task)
{
- SD_CHECK_INIT_DONE();
- xbt_assert0(task != NULL, "Invalid parameter");
return task->state;
}
task->finish_time =
surf_workstation_model->action_get_finish_time(task->surf_action);
task->remains = 0;
+#ifdef HAVE_JEDULE
+ jedule_log_sd_event(task);
+#endif
break;
case SD_FAILED:
task->state_set = sd_global->failed_task_set;
break;
default:
- xbt_assert0(0, "Invalid state");
+ xbt_die( "Invalid state");
}
xbt_swag_insert(task, task->state_set);
task->state = new_state;
if (task->watch_points & new_state) {
- VERB1("Watch point reached with task '%s'!", SD_task_get_name(task));
+ XBT_VERB("Watch point reached with task '%s'!", SD_task_get_name(task));
sd_global->watch_point_reached = 1;
SD_task_unwatch(task, new_state); /* remove the watch point */
}
*/
const char *SD_task_get_name(SD_task_t task)
{
- SD_CHECK_INIT_DONE();
- xbt_assert0(task != NULL, "Invalid parameter");
return task->name;
}
unsigned int i;
xbt_dynar_t parents;
SD_dependency_t dep;
- SD_CHECK_INIT_DONE();
- xbt_assert0(task != NULL, "Invalid parameter");
parents = xbt_dynar_new(sizeof(SD_task_t), NULL);
xbt_dynar_foreach(task->tasks_before, i, dep) {
unsigned int i;
xbt_dynar_t children;
SD_dependency_t dep;
- SD_CHECK_INIT_DONE();
- xbt_assert0(task != NULL, "Invalid parameter");
children = xbt_dynar_new(sizeof(SD_task_t), NULL);
xbt_dynar_foreach(task->tasks_after, i, dep) {
*/
int SD_task_get_workstation_count(SD_task_t task)
{
- SD_CHECK_INIT_DONE();
- xbt_assert0(task != NULL, "Invalid parameter");
- // xbt_assert1( task->state_set != sd_global->scheduled_task_set,
- // "Unscheduled task %s", task->name);
return task->workstation_nb;
}
*/
SD_workstation_t *SD_task_get_workstation_list(SD_task_t task)
{
- SD_CHECK_INIT_DONE();
- xbt_assert0(task != NULL, "Invalid parameter");
- //xbt_assert1( task->state_set != sd_global->scheduled_task_set,
- // "Unscheduled task %s", task->name);
return task->workstation_list;
}
*/
double SD_task_get_amount(SD_task_t task)
{
- SD_CHECK_INIT_DONE();
- xbt_assert0(task != NULL, "Invalid parameter");
return task->amount;
}
*/
double SD_task_get_remaining_amount(SD_task_t task)
{
- SD_CHECK_INIT_DONE();
- xbt_assert0(task != NULL, "Invalid parameter");
-
if (task->surf_action)
return surf_workstation_model->get_remains(task->surf_action);
else
SD_dependency_t dependency;
char *statename;
- INFO1("Displaying task %s", SD_task_get_name(task));
+ XBT_INFO("Displaying task %s", SD_task_get_name(task));
statename = bprintf("%s %s %s %s %s %s %s %s",
(task->state & SD_NOT_SCHEDULED ? "not scheduled" :
""),
(task->state & SD_RUNNING ? "running" : ""),
(task->state & SD_DONE ? "done" : ""),
(task->state & SD_FAILED ? "failed" : ""));
- INFO1(" - state: %s", statename);
+ XBT_INFO(" - state: %s", statename);
free(statename);
if (task->kind != 0) {
switch (task->kind) {
case SD_TASK_COMM_E2E:
- INFO0(" - kind: end-to-end communication");
+ XBT_INFO(" - kind: end-to-end communication");
break;
case SD_TASK_COMP_SEQ:
- INFO0(" - kind: sequential computation");
+ XBT_INFO(" - kind: sequential computation");
+ break;
+ case SD_TASK_COMP_PAR_AMDAHL:
+ XBT_INFO(" - kind: parallel computation following Amdahl's law");
break;
default:
- INFO1(" - (unknown kind %d)", task->kind);
+ XBT_INFO(" - (unknown kind %d)", task->kind);
}
}
- INFO1(" - amount: %.0f", SD_task_get_amount(task));
- INFO1(" - Dependencies to satisfy: %d", task->unsatisfied_dependencies);
- if (xbt_dynar_length(task->tasks_before)) {
- INFO0(" - pre-dependencies:");
+ XBT_INFO(" - amount: %.0f", SD_task_get_amount(task));
+ XBT_INFO(" - Dependencies to satisfy: %u", task->unsatisfied_dependencies);
+ if (!xbt_dynar_is_empty(task->tasks_before)) {
+ XBT_INFO(" - pre-dependencies:");
xbt_dynar_foreach(task->tasks_before, counter, dependency) {
- INFO1(" %s", SD_task_get_name(dependency->src));
+ XBT_INFO(" %s", SD_task_get_name(dependency->src));
}
}
- if (xbt_dynar_length(task->tasks_after)) {
- INFO0(" - post-dependencies:");
+ if (!xbt_dynar_is_empty(task->tasks_after)) {
+ XBT_INFO(" - post-dependencies:");
xbt_dynar_foreach(task->tasks_after, counter, dependency) {
- INFO1(" %s", SD_task_get_name(dependency->dst));
+ XBT_INFO(" %s", SD_task_get_name(dependency->dst));
}
}
}
*/
static void __SD_task_dependency_destroy(void *dependency)
{
- if (((SD_dependency_t) dependency)->name != NULL)
- xbt_free(((SD_dependency_t) dependency)->name);
+ xbt_free(((SD_dependency_t)dependency)->name);
xbt_free(dependency);
}
int i;
SD_dependency_t dependency;
- SD_CHECK_INIT_DONE();
- xbt_assert0(src != NULL && dst != NULL, "Invalid parameter");
-
dynar = src->tasks_after;
length = xbt_dynar_length(dynar);
if (src == dst)
- THROW1(arg_error, 0,
+ THROWF(arg_error, 0,
"Cannot add a dependency between task '%s' and itself",
SD_task_get_name(src));
if (!__SD_task_is_not_scheduled(src) && !__SD_task_is_schedulable(src)
- && !__SD_task_is_scheduled_or_runnable(src))
- THROW1(arg_error, 0,
- "Task '%s' must be SD_NOT_SCHEDULED, SD_SCHEDULABLE, SD_SCHEDULED or SD_RUNNABLE",
+ && !__SD_task_is_scheduled_or_runnable(src) && !__SD_task_is_running(src))
+ THROWF(arg_error, 0,
+ "Task '%s' must be SD_NOT_SCHEDULED, SD_SCHEDULABLE, SD_SCHEDULED or SD_RUNNABLE"
+ " or SD_RUNNING",
SD_task_get_name(src));
if (!__SD_task_is_not_scheduled(dst) && !__SD_task_is_schedulable(dst)
&& !__SD_task_is_scheduled_or_runnable(dst))
- THROW1(arg_error, 0,
+ THROWF(arg_error, 0,
"Task '%s' must be SD_NOT_SCHEDULED, SD_SCHEDULABLE, SD_SCHEDULED or SD_RUNNABLE",
SD_task_get_name(dst));
- DEBUG2("SD_task_dependency_add: src = %s, dst = %s",
+ XBT_DEBUG("SD_task_dependency_add: src = %s, dst = %s",
SD_task_get_name(src), SD_task_get_name(dst));
for (i = 0; i < length && !found; i++) {
xbt_dynar_get_cpy(dynar, i, &dependency);
found = (dependency->dst == dst);
- DEBUG2("Dependency %d: dependency->dst = %s", i,
+ XBT_DEBUG("Dependency %d: dependency->dst = %s", i,
SD_task_get_name(dependency->dst));
}
if (found)
- THROW2(arg_error, 0,
+ THROWF(arg_error, 0,
"A dependency already exists between task '%s' and task '%s'",
SD_task_get_name(src), SD_task_get_name(dst));
/* if the task was runnable, then dst->tasks_before is not empty anymore,
so we must go back to state SD_SCHEDULED */
if (__SD_task_is_runnable(dst)) {
- DEBUG1
+ XBT_DEBUG
("SD_task_dependency_add: %s was runnable and becomes scheduled!",
SD_task_get_name(dst));
__SD_task_set_state(dst, SD_SCHEDULED);
}
/**
- * \brief Indacates whether there is a dependency between two tasks.
+ * \brief Indicates whether there is a dependency between two tasks.
*
* \param src a task
* \param dst a task depending on \a src
unsigned int counter;
SD_dependency_t dependency;
- SD_CHECK_INIT_DONE();
- xbt_assert0(src != NULL
+ xbt_assert(src != NULL
|| dst != NULL,
"Invalid parameter: both src and dst are NULL");
int i;
SD_dependency_t dependency;
- SD_CHECK_INIT_DONE();
- xbt_assert0(src != NULL && dst != NULL, "Invalid parameter");
-
/* remove the dependency from src->tasks_after */
dynar = src->tasks_after;
length = xbt_dynar_length(dynar);
}
}
if (!found)
- THROW4(arg_error, 0,
+ THROWF(arg_error, 0,
"No dependency found between task '%s' and '%s': task '%s' is not a successor of task '%s'",
SD_task_get_name(src), SD_task_get_name(dst),
SD_task_get_name(dst), SD_task_get_name(src));
}
}
/* should never happen... */
- xbt_assert4(found,
+ xbt_assert(found,
"SimDag error: task '%s' is a successor of '%s' but task '%s' is not a predecessor of task '%s'",
SD_task_get_name(dst), SD_task_get_name(src),
SD_task_get_name(src), SD_task_get_name(dst));
int i;
SD_dependency_t dependency;
-
- SD_CHECK_INIT_DONE();
- xbt_assert0(src != NULL && dst != NULL, "Invalid parameter");
-
dynar = src->tasks_after;
length = xbt_dynar_length(dynar);
found = (dependency->dst == dst);
}
if (!found)
- THROW2(arg_error, 0, "No dependency found between task '%s' and '%s'",
+ THROWF(arg_error, 0, "No dependency found between task '%s' and '%s'",
SD_task_get_name(src), SD_task_get_name(dst));
return dependency->data;
}
};
int i;
- INFO2("Task '%s' watch points (%x): ", SD_task_get_name(task),
+ XBT_INFO("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]);
+ XBT_INFO("%s ", state_names[i]);
}
}
*/
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,
+ THROWF(arg_error, 0,
"Cannot add a watch point for state SD_NOT_SCHEDULED");
task->watch_points = task->watch_points | state;
*/
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,
+ xbt_assert(state != SD_NOT_SCHEDULED,
"SimDag error: Cannot have a watch point for state SD_NOT_SCHEDULED");
task->watch_points = task->watch_points & ~state;
{
double time, max_time = 0.0;
int i, j;
- SD_CHECK_INIT_DONE();
- xbt_assert0(task != NULL && workstation_nb > 0
- && workstation_list != NULL, "Invalid parameter");
+ xbt_assert(workstation_nb > 0, "Invalid parameter");
/* the task execution time is the maximum execution time of the parallel tasks */
static XBT_INLINE void SD_task_do_schedule(SD_task_t task)
{
- SD_CHECK_INIT_DONE();
-
if (!__SD_task_is_not_scheduled(task) && !__SD_task_is_schedulable(task))
- THROW1(arg_error, 0, "Task '%s' has already been scheduled",
+ THROWF(arg_error, 0, "Task '%s' has already been scheduled",
SD_task_get_name(task));
/* update the task state */
* 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_count 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
int communication_nb;
task->workstation_nb = 0;
task->rate = -1;
- xbt_assert0(workstation_count > 0, "workstation_nb must be positive");
+ xbt_assert(workstation_count > 0, "workstation_nb must be positive");
task->workstation_nb = workstation_count;
task->rate = rate;
*/
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->runnable_task_set &&
task->state_set != sd_global->running_task_set &&
task->state_set != sd_global->failed_task_set)
- THROW1(arg_error, 0,
+ THROWF(arg_error, 0,
"Task %s: the state must be SD_SCHEDULED, SD_RUNNABLE, SD_RUNNING or SD_FAILED",
SD_task_get_name(task));
if (__SD_task_is_scheduled_or_runnable(task) /* if the task is scheduled or runnable */
- &&task->kind == SD_TASK_NOT_TYPED) /* Don't free scheduling data for typed tasks */
+ && ((task->kind == SD_TASK_COMP_PAR_AMDAHL) ||
+ (task->kind == SD_TASK_COMM_PAR_MXN_1D_BLOCK))) { /* Don't free scheduling data for typed tasks */
__SD_task_destroy_scheduling_data(task);
+ task->workstation_list=NULL;
+ task->workstation_nb = 0;
+ }
if (__SD_task_is_running(task)) /* the task should become SD_FAILED */
surf_workstation_model->action_cancel(task->surf_action);
*/
static void __SD_task_destroy_scheduling_data(SD_task_t task)
{
- SD_CHECK_INIT_DONE();
if (!__SD_task_is_scheduled_or_runnable(task)
&& !__SD_task_is_in_fifo(task))
- THROW1(arg_error, 0,
+ THROWF(arg_error, 0,
"Task '%s' must be SD_SCHEDULED, SD_RUNNABLE or SD_IN_FIFO",
SD_task_get_name(task));
int i;
void **surf_workstations;
- SD_CHECK_INIT_DONE();
- xbt_assert0(task != NULL, "Invalid parameter");
- xbt_assert2(__SD_task_is_runnable_or_in_fifo(task),
+ xbt_assert(__SD_task_is_runnable_or_in_fifo(task),
"Task '%s' is not runnable or in a fifo! Task state: %d",
- SD_task_get_name(task), SD_task_get_state(task));
- xbt_assert1(task->workstation_list != NULL,
+ SD_task_get_name(task), (int)SD_task_get_state(task));
+ xbt_assert(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));
+ XBT_DEBUG("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]),
+ xbt_assert(__SD_workstation_is_busy(task->workstation_list[i]),
"The workstation should be busy now");
}
}
- DEBUG1("Task '%s' set as current task for its workstations",
+ XBT_DEBUG("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 */
+ /* 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;
- /* It's allowed to pass a NULL vector as cost to mean vector of 0.0 (easing user's life). Let's deal with it */
+ /* It's allowed to pass a NULL vector as cost to mean vector of 0.0 (easing
+ * user's life). Let's deal with it */
#define cost_or_zero(array,pos) ((array)?(array)[pos]:0.0)
task->surf_action = NULL;
surf_workstations,
computation_amount,
communication_amount,
- task->amount, task->rate);
+ task->rate);
} else {
xbt_free(surf_workstations);
}
surf_workstation_model->action_data_set(task->surf_action, task);
- DEBUG1("surf_action = %p", task->surf_action);
+ XBT_DEBUG("surf_action = %p", task->surf_action);
#ifdef HAVE_TRACING
if (task->category)
__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));
+ xbt_assert(__SD_task_is_running(task), "Bad state of task '%s': %d",
+ SD_task_get_name(task), (int)SD_task_get_state(task));
}
int i;
SD_workstation_t workstation;
- SD_CHECK_INIT_DONE();
- xbt_assert0(task != NULL, "Invalid parameter");
- xbt_assert2(__SD_task_is_runnable(task),
+ xbt_assert(__SD_task_is_runnable(task),
"Task '%s' is not runnable! Task state: %d",
- SD_task_get_name(task), SD_task_get_state(task));
+ SD_task_get_name(task), (int)SD_task_get_state(task));
for (i = 0; i < task->workstation_nb; i++) {
!__SD_workstation_is_busy(task->workstation_list[i]);
}
- DEBUG2("Task '%s' can start: %d", SD_task_get_name(task), can_start);
+ XBT_DEBUG("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'",
+ XBT_DEBUG("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));
+ xbt_assert(__SD_task_is_in_fifo(task), "Bad state of task '%s': %d",
+ SD_task_get_name(task), (int)SD_task_get_state(task));
+ XBT_DEBUG("Task '%s' state is now SD_IN_FIFO", SD_task_get_name(task));
} else {
__SD_task_really_run(task);
}
SD_task_t *candidates;
int can_start = 1;
- SD_CHECK_INIT_DONE();
- xbt_assert0(task != NULL, "Invalid parameter");
- xbt_assert1(__SD_task_is_running(task),
+ xbt_assert(__SD_task_is_running(task),
"The task must be running! Task state: %d",
- SD_task_get_state(task));
- xbt_assert1(task->workstation_list != NULL,
+ (int)SD_task_get_state(task));
+ xbt_assert(task->workstation_list != NULL,
"Task '%s': workstation_list is NULL!",
SD_task_get_name(task));
surf_workstation_model->action_unref(task->surf_action);
task->surf_action = NULL;
- DEBUG0("Looking for candidates");
+ XBT_DEBUG("Looking for candidates");
/* if the task was executed on sequential workstations,
maybe we can execute the next task of the fifo for each workstation */
for (i = 0; i < task->workstation_nb; i++) {
workstation = task->workstation_list[i];
- DEBUG2("Workstation '%s': access_mode = %d",
- SD_workstation_get_name(workstation), workstation->access_mode);
+ XBT_DEBUG("Workstation '%s': access_mode = %d",
+ SD_workstation_get_name(workstation), (int)workstation->access_mode);
if (workstation->access_mode == SD_WORKSTATION_SEQUENTIAL_ACCESS) {
- xbt_assert1(workstation->task_fifo != NULL,
+ xbt_assert(workstation->task_fifo != NULL,
"Workstation '%s' has sequential access but no fifo!",
SD_workstation_get_name(workstation));
- xbt_assert2(workstation->current_task =
+ xbt_assert(workstation->current_task =
task, "Workstation '%s': current task should be '%s'",
SD_workstation_get_name(workstation),
SD_task_get_name(task));
/* the task is over so we can release the workstation */
workstation->current_task = NULL;
- DEBUG0("Getting candidate in fifo");
+ XBT_DEBUG("Getting candidate in fifo");
candidate =
xbt_fifo_get_item_content(xbt_fifo_get_first_item
(workstation->task_fifo));
if (candidate != NULL) {
- DEBUG1("Candidate: '%s'", SD_task_get_name(candidate));
- xbt_assert2(__SD_task_is_in_fifo(candidate),
+ XBT_DEBUG("Candidate: '%s'", SD_task_get_name(candidate));
+ xbt_assert(__SD_task_is_in_fifo(candidate),
"Bad state of candidate '%s': %d",
SD_task_get_name(candidate),
- SD_task_get_state(candidate));
+ (int)SD_task_get_state(candidate));
}
- DEBUG1("Candidate in fifo: %p", candidate);
+ XBT_DEBUG("Candidate in fifo: %p", candidate);
/* if there was a task waiting for my place */
if (candidate != NULL) {
}
}
- DEBUG1("Candidates found: %d", candidate_nb);
+ XBT_DEBUG("Candidates found: %d", candidate_nb);
/* now we check every candidate task */
for (i = 0; i < candidate_nb; i++) {
continue; /* we have already evaluated that task */
}
- xbt_assert2(__SD_task_is_in_fifo(candidate),
+ xbt_assert(__SD_task_is_in_fifo(candidate),
"Bad state of candidate '%s': %d",
- SD_task_get_name(candidate), SD_task_get_state(candidate));
+ SD_task_get_name(candidate), (int)SD_task_get_state(candidate));
for (j = 0; j < candidate->workstation_nb && can_start; j++) {
workstation = candidate->workstation_list[j];
(workstation->task_fifo));
}
- DEBUG2("Candidate '%s' can start: %d", SD_task_get_name(candidate),
+ XBT_DEBUG("Candidate '%s' can start: %d", SD_task_get_name(candidate),
can_start);
/* now we are sure that I can start! */
/* update the fifo */
if (workstation->access_mode == SD_WORKSTATION_SEQUENTIAL_ACCESS) {
candidate = xbt_fifo_shift(workstation->task_fifo); /* the return value is stored just for debugging */
- DEBUG1("Head of the fifo: '%s'",
+ XBT_DEBUG("Head of the fifo: '%s'",
(candidate !=
NULL) ? SD_task_get_name(candidate) : "NULL");
- xbt_assert0(candidate == candidates[i],
+ xbt_assert(candidate == candidates[i],
"Error in __SD_task_just_done: bad first task in the fifo");
}
} /* for each workstation */
/* finally execute the task */
- DEBUG2("Task '%s' state: %d", SD_task_get_name(candidate),
- SD_task_get_state(candidate));
+ XBT_DEBUG("Task '%s' state: %d", SD_task_get_name(candidate),
+ (int)SD_task_get_state(candidate));
__SD_task_really_run(candidate);
- DEBUG4
+ XBT_DEBUG
("Calling __SD_task_is_running: task '%s', state set: %p, running_task_set: %p, is running: %d",
SD_task_get_name(candidate), candidate->state_set,
sd_global->running_task_set, __SD_task_is_running(candidate));
- xbt_assert2(__SD_task_is_running(candidate),
+ xbt_assert(__SD_task_is_running(candidate),
"Bad state of task '%s': %d",
SD_task_get_name(candidate),
- SD_task_get_state(candidate));
- DEBUG0("Okay, the task is running.");
+ (int)SD_task_get_state(candidate));
+ XBT_DEBUG("Okay, the task is running.");
} /* can start */
candidate->fifo_checked = 1;
xbt_free(candidates);
}
-/* Remove all dependencies associated with a task. This function is called when the task is destroyed.
+/*
+ * Remove all dependencies associated with a task. This function is called
+ * when the task is destroyed.
*/
static void __SD_task_remove_dependencies(SD_task_t task)
{
/* we must destroy the dependencies carefuly (with SD_dependency_remove)
because each one is stored twice */
SD_dependency_t dependency;
- while (xbt_dynar_length(task->tasks_before) > 0) {
+ while (!xbt_dynar_is_empty(task->tasks_before)) {
xbt_dynar_get_cpy(task->tasks_before, 0, &dependency);
SD_task_dependency_remove(dependency->src, dependency->dst);
}
- while (xbt_dynar_length(task->tasks_after) > 0) {
+ while (!xbt_dynar_is_empty(task->tasks_after)) {
xbt_dynar_get_cpy(task->tasks_after, 0, &dependency);
SD_task_dependency_remove(dependency->src, dependency->dst);
}
*/
double SD_task_get_start_time(SD_task_t task)
{
- SD_CHECK_INIT_DONE();
- xbt_assert0(task != NULL, "Invalid parameter");
if (task->surf_action)
return surf_workstation_model->
action_get_start_time(task->surf_action);
*/
double SD_task_get_finish_time(SD_task_t task)
{
- SD_CHECK_INIT_DONE();
- xbt_assert0(task != NULL, "Invalid parameter");
-
if (task->surf_action) /* should never happen as actions are destroyed right after their completion */
return surf_workstation_model->
action_get_finish_time(task->surf_action);
else
return task->finish_time;
}
-
-/**
- * \brief Destroys a task.
- *
- * The user data (if any) should have been destroyed first.
+/** @brief Blah
*
- * \param task the task you want to destroy
- * \see SD_task_create()
*/
-void SD_task_destroy(SD_task_t task)
+void SD_task_distribute_comp_amdhal(SD_task_t task, int ws_count)
{
- SD_CHECK_INIT_DONE();
- xbt_assert0(task != NULL, "Invalid parameter");
-
- DEBUG1("Destroying task %s...", SD_task_get_name(task));
-
- __SD_task_remove_dependencies(task);
- /* if the task was scheduled or runnable we have to free the scheduling parameters */
- if (__SD_task_is_scheduled_or_runnable(task))
- __SD_task_destroy_scheduling_data(task);
- xbt_swag_remove(task, task->state_set);
-
- if (task->name != NULL)
- xbt_free(task->name);
-
- if (task->surf_action != NULL)
- surf_workstation_model->action_unref(task->surf_action);
-
- if (task->workstation_list != NULL)
- xbt_free(task->workstation_list);
-
- if (task->communication_amount)
- xbt_free(task->communication_amount);
-
- if (task->computation_amount)
- xbt_free(task->computation_amount);
-
-#ifdef HAVE_TRACING
- TRACE_sd_task_destroy(task);
-#endif
-
- xbt_dynar_free(&task->tasks_before);
- xbt_dynar_free(&task->tasks_after);
- xbt_free(task);
-
- sd_global->task_number--;
-
- DEBUG0("Task destroyed.");
-}
-
-
-static XBT_INLINE SD_task_t SD_task_create_sized(const char *name,
- void *data, double amount,
- int ws_count)
-{
- SD_task_t task = SD_task_create(name, data, amount);
- task->communication_amount = xbt_new0(double, ws_count * ws_count);
+ int i;
+ xbt_assert(task->kind == SD_TASK_COMP_PAR_AMDAHL,
+ "Task %s is not a SD_TASK_COMP_PAR_AMDAHL typed task."
+ "Cannot use this function.",
+ SD_task_get_name(task));
+
task->computation_amount = xbt_new0(double, ws_count);
+ task->communication_amount = xbt_new0(double, ws_count * ws_count);
task->workstation_nb = ws_count;
task->workstation_list = xbt_new0(SD_workstation_t, ws_count);
- return task;
-}
-
-/** @brief create a end-to-end communication task that can then be auto-scheduled
- *
- * Auto-scheduling mean that the task can be used with SD_task_schedulev(). This
- * allows to specify the task costs at creation, and decorelate them from the
- * scheduling process where you just specify which resource should deliver the
- * mandatory power.
- *
- * A end-to-end communication must be scheduled on 2 hosts, and the amount
- * specified at creation is sent from hosts[0] to hosts[1].
- */
-SD_task_t SD_task_create_comm_e2e(const char *name, void *data,
- double amount)
-{
- SD_task_t res = SD_task_create_sized(name, data, amount, 2);
- res->communication_amount[2] = amount;
- res->kind = SD_TASK_COMM_E2E;
- return res;
-}
+
+ for(i=0;i<ws_count;i++){
+ task->computation_amount[i] =
+ (task->alpha + (1 - task->alpha)/ws_count) * task->amount;
+ }
+}
-/** @brief create a sequential computation task that can then be auto-scheduled
- *
- * Auto-scheduling mean that the task can be used with SD_task_schedulev(). This
- * allows to specify the task costs at creation, and decorelate them from the
- * scheduling process where you just specify which resource should deliver the
- * mandatory power.
- *
- * A sequential computation must be scheduled on 1 host, and the amount
- * specified at creation to be run on hosts[0].
- */
-SD_task_t SD_task_create_comp_seq(const char *name, void *data,
- double amount)
-{
- SD_task_t res = SD_task_create_sized(name, data, amount, 1);
- res->computation_amount[0] = amount;
- res->kind = SD_TASK_COMP_SEQ;
- return res;
-}
/** @brief Auto-schedules a task.
*
void SD_task_schedulev(SD_task_t task, int count,
const SD_workstation_t * list)
{
- int i;
+ int i, j;
SD_dependency_t dep;
unsigned int cpt;
- xbt_assert1(task->kind != 0,
+ xbt_assert(task->kind != 0,
"Task %s is not typed. Cannot automatically schedule it.",
SD_task_get_name(task));
switch (task->kind) {
+ case SD_TASK_COMP_PAR_AMDAHL:
+ SD_task_distribute_comp_amdhal(task, count);
case SD_TASK_COMM_E2E:
case SD_TASK_COMP_SEQ:
- xbt_assert(task->workstation_nb == count);
+ xbt_assert(task->workstation_nb == count,"Got %d locations, but were expecting %d locations",count,task->workstation_nb);
for (i = 0; i < count; i++)
task->workstation_list[i] = list[i];
SD_task_do_schedule(task);
break;
default:
- xbt_die(bprintf("Kind of task %s not supported by SD_task_schedulev()",
- SD_task_get_name(task)));
+ xbt_die("Kind of task %s not supported by SD_task_schedulev()",
+ SD_task_get_name(task));
}
if (task->kind == SD_TASK_COMM_E2E) {
- VERB4("Schedule comm task %s between %s -> %s. It costs %.f bytes",
+ XBT_VERB("Schedule comm task %s between %s -> %s. It costs %.f bytes",
SD_task_get_name(task),
SD_workstation_get_name(task->workstation_list[0]),
SD_workstation_get_name(task->workstation_list[1]),
task->communication_amount[2]);
}
+
/* Iterate over all childs and parent being COMM_E2E to say where I am located (and start them if runnable) */
if (task->kind == SD_TASK_COMP_SEQ) {
- VERB3("Schedule computation task %s on %s. It costs %.f flops",
+ XBT_VERB("Schedule computation task %s on %s. It costs %.f flops",
SD_task_get_name(task),
SD_workstation_get_name(task->workstation_list[0]),
task->computation_amount[0]);
(__SD_task_is_schedulable(before)
|| __SD_task_is_not_scheduled(before))) {
SD_task_do_schedule(before);
- VERB4
+ XBT_VERB
("Auto-Schedule comm task %s between %s -> %s. It costs %.f bytes",
SD_task_get_name(before),
SD_workstation_get_name(before->workstation_list[0]),
SD_task_t after = dep->dst;
if (after->kind == SD_TASK_COMM_E2E) {
after->workstation_list[0] = task->workstation_list[0];
- //J-N : Why did you comment on these line (this comment add a bug I think)?
if (after->workstation_list[1]
&& (__SD_task_is_not_scheduled(after)
|| __SD_task_is_schedulable(after))) {
SD_task_do_schedule(after);
- VERB4
+ XBT_VERB
("Auto-Schedule comm task %s between %s -> %s. It costs %.f bytes",
SD_task_get_name(after),
SD_workstation_get_name(after->workstation_list[0]),
}
}
}
+ /* Iterate over all childs and parent being MXN_1D_BLOC to say where I am located (and start them if runnable) */
+ if (task->kind == SD_TASK_COMP_PAR_AMDAHL) {
+ XBT_VERB("Schedule computation task %s on %d workstations. %.f flops"
+ " will be distributed following Amdahl'Law",
+ SD_task_get_name(task), task->workstation_nb,
+ task->computation_amount[0]);
+ xbt_dynar_foreach(task->tasks_before, cpt, dep) {
+ SD_task_t before = dep->src;
+ if (before->kind == SD_TASK_COMM_PAR_MXN_1D_BLOCK){
+ if (!before->workstation_list){
+ XBT_VERB("Sender side of Task %s is not scheduled yet. Fill the workstation list with receiver side",
+ SD_task_get_name(before));
+ before->workstation_list = xbt_new0(SD_workstation_t, count);
+ before->workstation_nb = count;
+ for (i=0;i<count;i++)
+ before->workstation_list[i] = task->workstation_list[i];
+ } else {
+ int src_nb, dst_nb;
+ double src_start, src_end, dst_start, dst_end;
+ src_nb = before->workstation_nb;
+ dst_nb = count;
+ before->workstation_list = (SD_workstation_t*) xbt_realloc(
+ before->workstation_list,
+ (before->workstation_nb+count)*sizeof(s_SD_workstation_t));
+ for(i=0; i<count; i++)
+ before->workstation_list[before->workstation_nb+i] =
+ task->workstation_list[i];
+
+ before->workstation_nb += count;
+
+ before->computation_amount = xbt_new0(double,
+ before->workstation_nb);
+ before->communication_amount = xbt_new0(double,
+ before->workstation_nb*
+ before->workstation_nb);
+
+ for(i=0;i<src_nb;i++){
+ src_start = i*before->amount/src_nb;
+ src_end = src_start + before->amount/src_nb;
+ for(j=0; j<dst_nb; j++){
+ dst_start = j*before->amount/dst_nb;
+ dst_end = dst_start + before->amount/dst_nb;
+ XBT_VERB("(%s->%s): (%.2f, %.2f)-> (%.2f, %.2f)",
+ SD_workstation_get_name(before->workstation_list[i]),
+ SD_workstation_get_name(before->workstation_list[src_nb+j]),
+ src_start, src_end, dst_start, dst_end);
+ if ((src_end <= dst_start) || (dst_end <= src_start)) {
+ before->communication_amount[i*(src_nb+dst_nb)+src_nb+j]=0.0;
+ } else {
+ before->communication_amount[i*(src_nb+dst_nb)+src_nb+j] =
+ MIN(src_end, dst_end) - MAX(src_start, dst_start);
+ }
+ XBT_VERB("==> %.2f",
+ before->communication_amount[i*(src_nb+dst_nb)+src_nb+j]);
+ }
+ }
+
+ if (__SD_task_is_schedulable(before) ||
+ __SD_task_is_not_scheduled(before)) {
+ SD_task_do_schedule(before);
+ XBT_VERB
+ ("Auto-Schedule redistribution task %s. Send %.f bytes from %d hosts to %d hosts.",
+ SD_task_get_name(before),before->amount, src_nb, dst_nb);
+ }
+ }
+ }
+ }
+ xbt_dynar_foreach(task->tasks_after, cpt, dep) {
+ SD_task_t after = dep->dst;
+ if (after->kind == SD_TASK_COMM_PAR_MXN_1D_BLOCK){
+ if (!after->workstation_list){
+ XBT_VERB("Receiver side of Task %s is not scheduled yet. Fill the workstation list with sender side",
+ SD_task_get_name(after));
+ after->workstation_list = xbt_new0(SD_workstation_t, count);
+ after->workstation_nb = count;
+ for (i=0;i<count;i++)
+ after->workstation_list[i] = task->workstation_list[i];
+ } else {
+ int src_nb, dst_nb;
+ double src_start, src_end, dst_start, dst_end;
+ src_nb = count;
+ dst_nb = after->workstation_nb;
+ after->workstation_list = (SD_workstation_t*) xbt_realloc(
+ after->workstation_list,
+ (after->workstation_nb+count)*sizeof(s_SD_workstation_t));
+ for(i=after->workstation_nb - 1; i>=0; i--)
+ after->workstation_list[count+i] = after->workstation_list[i];
+ for(i=0; i<count; i++)
+ after->workstation_list[i] = task->workstation_list[i];
+
+ after->workstation_nb += count;
+
+ after->computation_amount = xbt_new0(double, after->workstation_nb);
+ after->communication_amount = xbt_new0(double,
+ after->workstation_nb*
+ after->workstation_nb);
+
+ for(i=0;i<src_nb;i++){
+ src_start = i*after->amount/src_nb;
+ src_end = src_start + after->amount/src_nb;
+ for(j=0; j<dst_nb; j++){
+ dst_start = j*after->amount/dst_nb;
+ dst_end = dst_start + after->amount/dst_nb;
+ XBT_VERB("(%d->%d): (%.2f, %.2f)-> (%.2f, %.2f)",
+ i, j, src_start, src_end, dst_start, dst_end);
+ if ((src_end <= dst_start) || (dst_end <= src_start)) {
+ after->communication_amount[i*(src_nb+dst_nb)+src_nb+j]=0.0;
+ } else {
+ after->communication_amount[i*(src_nb+dst_nb)+src_nb+j] =
+ MIN(src_end, dst_end)- MAX(src_start, dst_start);
+ }
+ XBT_VERB("==> %.2f",
+ after->communication_amount[i*(src_nb+dst_nb)+src_nb+j]);
+ }
+ }
+
+ if (__SD_task_is_schedulable(after) ||
+ __SD_task_is_not_scheduled(after)) {
+ SD_task_do_schedule(after);
+ XBT_VERB
+ ("Auto-Schedule redistribution task %s. Send %.f bytes from %d hosts to %d hosts.",
+ SD_task_get_name(after),after->amount, src_nb, dst_nb);
+ }
+ }
+ }
+ }
+ }
}
/** @brief autoschedule a task on a list of workstations
SD_task_schedulev(task, count, list);
free(list);
}
+
+/**
+ * \brief Sets the tracing category of a task.
+ *
+ * This function should be called after the creation of a
+ * SimDAG task, to define the category of that task. The first
+ * parameter must contain a task that was created with the
+ * function #SD_task_create. The second parameter must contain
+ * a category that was previously declared with the function
+ * #TRACE_category.
+ *
+ * \param task The task to be considered
+ * \param category the name of the category to be associated to the task
+ *
+ * \see SD_task_get_category, TRACE_category, TRACE_category_with_color
+ */
+void SD_task_set_category (SD_task_t task, const char *category)
+{
+#ifdef HAVE_TRACING
+ if (!TRACE_is_enabled()) return;
+ if (task == NULL) return;
+ if (category == NULL){
+ if (task->category) xbt_free (task->category);
+ task->category = NULL;
+ }else{
+ task->category = xbt_strdup (category);
+ }
+#endif
+}
+
+/**
+ * \brief Gets the current tracing category of a task.
+ *
+ * \param task The task to be considered
+ *
+ * \see SD_task_set_category
+ *
+ * \return Returns the name of the tracing category of the given task, NULL otherwise
+ */
+const char *SD_task_get_category (SD_task_t task)
+{
+#ifdef HAVE_TRACING
+ return task->category;
+#else
+ return NULL;
+#endif
+}