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 Destroys a task.
*
case SD_TASK_COMP_SEQ:
XBT_INFO(" - kind: sequential computation");
break;
+ case SD_TASK_COMP_PAR_AMDAHL:
+ XBT_INFO(" - kind: parallel computation following Amdahl's law");
+ break;
default:
XBT_INFO(" - (unknown kind %d)", task->kind);
}
surf_workstations,
computation_amount,
communication_amount,
- task->amount, task->rate);
+ task->rate);
} else {
xbt_free(surf_workstations);
}
else
return task->finish_time;
}
-
-static XBT_INLINE SD_task_t SD_task_create_sized(const char *name,
- void *data, double amount,
- int ws_count)
+/** @brief Blah
+ *
+ */
+void SD_task_distribute_comp_amdhal(SD_task_t task, 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;
-}
-
-/** @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;
-}
+
+ for(i=0;i<ws_count;i++){
+ task->computation_amount[i] =
+ (task->alpha + (1 - task->alpha)/ws_count) * task->amount;
+ }
+}
/** @brief Auto-schedules a task.
*
SD_task_get_name(task));
switch (task->kind) {
case SD_TASK_COMM_E2E:
+ case SD_TASK_COMP_PAR_AMDAHL:
+ xbt_assert(task->computation_amount, "SD_task_distribute_comp_amdhal should be called first.");
case SD_TASK_COMP_SEQ:
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->communication_amount[2]);
}
+ if (task->kind == SD_TASK_COMP_PAR_AMDAHL) {
+ XBT_VERB("Schedule computation task %s on %d hosts. It costs %.f flops on each host",
+ SD_task_get_name(task),
+ task->workstation_nb,
+ task->computation_amount[0]);
+ }
+
/* 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) {
XBT_VERB("Schedule computation task %s on %s. It costs %.f flops",
