-/* Copyright (c) 2004-2017. The SimGrid Team. All rights reserved. */
+/* Copyright (c) 2004-2018. The SimGrid Team. All rights reserved. */
/* This program is free software; you can redistribute it and/or modify it
* under the terms of the license (GNU LGPL) which comes with this package. */
#include "src/simix/smx_private.hpp"
#include <algorithm>
-extern "C" {
-
-/** @addtogroup m_task_management
- *
- * Since most scheduling algorithms rely on a concept of task that can be either <em>computed</em> locally or
- * <em>transferred</em> on another processor, it seems to be the right level of abstraction for our purposes.
- * A <em>task</em> may then be defined by a <em>computing amount</em>, a <em>message size</em> and
- * some <em>private data</em>.
- */
-
XBT_LOG_NEW_DEFAULT_SUBCATEGORY(msg_task, msg, "Logging specific to MSG (task)");
void s_simdata_task_t::reportMultipleUse() const
}
/********************************* Task **************************************/
-/** \ingroup m_task_management
- * \brief Creates a new #msg_task_t.
+/** @brief Creates a new task
+ *
+ * A constructor for msg_task_t taking four arguments.
*
- * A constructor for #msg_task_t taking four arguments and returning the corresponding object.
- * \param name a name for the object. It is for user-level information and can be nullptr.
- * \param flop_amount a value of the processing amount (in flop) needed to process this new task.
+ * @param name a name for the object. It is for user-level information and can be nullptr.
+ * @param flop_amount a value of the processing amount (in flop) needed to process this new task.
* If 0, then it cannot be executed with MSG_task_execute(). This value has to be >=0.
- * \param message_size a value of the amount of data (in bytes) needed to transfer this new task. If 0, then it cannot
+ * @param message_size a value of the amount of data (in bytes) needed to transfer this new task. If 0, then it cannot
* be transfered with MSG_task_send() and MSG_task_recv(). This value has to be >=0.
- * \param data a pointer to any data may want to attach to the new object. It is for user-level information and can
- * be nullptr. It can be retrieved with the function \ref MSG_task_get_data.
- * \see msg_task_t
- * \return The new corresponding object.
+ * @param data a pointer to any data may want to attach to the new object. It is for user-level information and can
+ * be nullptr. It can be retrieved with the function @ref MSG_task_get_data.
+ * @return The new corresponding object.
*/
msg_task_t MSG_task_create(const char *name, double flop_amount, double message_size, void *data)
{
return task;
}
-/** \ingroup m_task_management
- * \brief Creates a new #msg_task_t (a parallel one....).
+/** @brief Creates a new parallel task
*
- * A constructor for #msg_task_t taking six arguments and returning the corresponding object.
- * \param name a name for the object. It is for user-level information and can be nullptr.
- * \param host_nb the number of hosts implied in the parallel task.
- * \param host_list an array of \p host_nb msg_host_t.
- * \param flops_amount an array of \p host_nb doubles.
+ * A constructor for #msg_task_t taking six arguments.
+ *
+ * \rst
+ * See :cpp:func:`void simgrid::s4u::this_actor::parallel_execute(int, s4u::Host**, double*, double*)` for
+ * the exact semantic of the parameters.
+ * \endrst
+ *
+ * @param name a name for the object. It is for user-level information and can be nullptr.
+ * @param host_nb the number of hosts implied in the parallel task.
+ * @param host_list an array of @p host_nb msg_host_t.
+ * @param flops_amount an array of @p host_nb doubles.
* flops_amount[i] is the total number of operations that have to be performed on host_list[i].
- * \param bytes_amount an array of \p host_nb* \p host_nb doubles.
- * \param data a pointer to any data may want to attach to the new object.
+ * @param bytes_amount an array of @p host_nb* @p host_nb doubles.
+ * @param data a pointer to any data may want to attach to the new object.
* It is for user-level information and can be nullptr.
- * It can be retrieved with the function \ref MSG_task_get_data.
- * \see msg_task_t
- * \return The new corresponding object.
+ * It can be retrieved with the function @ref MSG_task_get_data().
*/
msg_task_t MSG_parallel_task_create(const char *name, int host_nb, const msg_host_t * host_list,
double *flops_amount, double *bytes_amount, void *data)
{
- msg_task_t task = MSG_task_create(name, 0, 0, data);
+ // Task's flops amount is set to an arbitrary value > 0.0 to be able to distinguish, in
+ // MSG_task_get_remaining_work_ratio(), a finished task and a task that has not started yet.
+ msg_task_t task = MSG_task_create(name, 1.0, 0, data);
simdata_task_t simdata = task->simdata;
/* Simulator Data specific to parallel tasks */
return task;
}
-/** \ingroup m_task_management
- * \brief Return the user data of a #msg_task_t.
- *
- * This function checks whether \a task is a valid pointer and return the user data associated to \a task if possible.
- */
+/** @brief Return the user data of the given task */
void *MSG_task_get_data(msg_task_t task)
{
return (task->data);
}
-/** \ingroup m_task_management
- * \brief Sets the user data of a #msg_task_t.
- *
- * This function allows to associate a new pointer to the user data associated of \a task.
- */
+/** @brief Sets the user data of a given task */
void MSG_task_set_data(msg_task_t task, void *data)
{
task->data = data;
}
-/** \ingroup m_task_management
- * \brief Sets a function to be called when a task has just been copied.
- * \param callback a callback function
+/** @brief Sets a function to be called when a task has just been copied.
+ * @param callback a callback function
*/
void MSG_task_set_copy_callback(void (*callback) (msg_task_t task, msg_process_t sender, msg_process_t receiver)) {
}
}
-/** \ingroup m_task_management
- * \brief Return the sender of a #msg_task_t.
- *
- * This functions returns the #msg_process_t which sent this task
- */
+/** @brief Returns the sender of the given task */
msg_process_t MSG_task_get_sender(msg_task_t task)
{
return task->simdata->sender;
}
-/** \ingroup m_task_management
- * \brief Return the source of a #msg_task_t.
- *
- * This functions returns the #msg_host_t from which this task was sent
- */
+/** @brief Returns the source (the sender's host) of the given task */
msg_host_t MSG_task_get_source(msg_task_t task)
{
return task->simdata->source;
}
-/** \ingroup m_task_management
- * \brief Return the name of a #msg_task_t.
- *
- * This functions returns the name of a #msg_task_t as specified on creation
- */
+/** @brief Returns the name of the given task. */
const char *MSG_task_get_name(msg_task_t task)
{
return task->name;
}
-/** \ingroup m_task_management
- * \brief Sets the name of a #msg_task_t.
- *
- * This functions allows to associate a name to a task
- */
+/** @brief Sets the name of the given task. */
void MSG_task_set_name(msg_task_t task, const char *name)
{
task->name = xbt_strdup(name);
}
-/** \ingroup m_task_management
- * \brief Destroy a #msg_task_t.
+/** @brief Destroys the given task.
*
- * Destructor for #msg_task_t. Note that you should free user data, if any, \b before calling this function.
+ * You should free user data, if any, @b before calling this destructor.
*
* Only the process that owns the task can destroy it.
* The owner changes after a successful send.
return MSG_OK;
}
-/** \ingroup m_task_usage
- * \brief Cancel a #msg_task_t.
- * \param task the task to cancel. If it was executed or transfered, it stops the process that were working on it.
+/** @brief Cancel the given task
+ *
+ * If it was currently executed or transfered, the working process is stopped.
*/
msg_error_t MSG_task_cancel(msg_task_t task)
{
xbt_assert((task != nullptr), "Cannot cancel a nullptr task");
- if (task->simdata->compute) {
- simcall_execution_cancel(task->simdata->compute);
- }
- else if (task->simdata->comm) {
- simdata_task_t simdata = task->simdata;
+ simdata_task_t simdata = task->simdata;
+ if (simdata->compute) {
+ simcall_execution_cancel(simdata->compute);
+ } else if (simdata->comm) {
simcall_comm_cancel(simdata->comm);
- simdata->setNotUsed();
}
+ simdata->setNotUsed();
return MSG_OK;
}
-/** \ingroup m_task_management
- * \brief Returns a value in ]0,1[ that represent the task remaining work
+/** @brief Returns a value in ]0,1[ that represent the task remaining work
* to do: starts at 1 and goes to 0. Returns 0 if not started or finished.
*
* It works for either parallel or sequential tasks.
- * TODO: Improve this function by returning 1 if the task has not started
*/
double MSG_task_get_remaining_work_ratio(msg_task_t task) {
xbt_assert((task != nullptr), "Cannot get information from a nullptr task");
if (task->simdata->compute) {
// Task in progress
- return task->simdata->compute->remains();
-
- //} else if ((MSG_task_get_flops_amount(task) == 0 and task->simdata->flops_parallel_amount == nullptr) //this is a sequential task
- // or (task->simdata->flops_parallel_amount != nullptr and task->simdata->flops_parallel_amount == 0)) {
- // // Task finished
- // return 1;
+ return task->simdata->compute->get_remaining_ratio();
} else {
- // Task not started or finished
- return 0;
+ // Task not started (flops_amount is > 0.0) or finished (flops_amount is set to 0.0)
+ return task->simdata->flops_amount > 0.0 ? 1.0 : 0.0;
}
}
+/** @brief Returns the amount of flops that remain to be computed
+ *
+ * The returned value is initially the cost that you defined for the task, then it decreases until it reaches 0
+ *
+ * It works for sequential tasks, but the remaining amount of work is not a scalar value for parallel tasks.
+ * So you will get an exception if you call this function on parallel tasks. Just don't do it.
+ */
double MSG_task_get_flops_amount(msg_task_t task) {
- if (task->simdata->compute) {
- return task->simdata->compute->remains();
+ if (task->simdata->compute != nullptr) {
+ return task->simdata->compute->get_remaining();
} else {
+ // Not started or already done.
+ // - Before starting, flops_amount is initially the task cost
+ // - After execution, flops_amount is set to 0 (until someone uses MSG_task_set_flops_amount, if any)
return task->simdata->flops_amount;
}
}
-/** \ingroup m_task_management
- * \brief Returns the initial amount of flops needed to execute a task #msg_task_t.
+/** @brief set the computation amount needed to process the given task.
*
- * Once a task has been processed, this amount is set to 0. If you want, you can reset this value with
- * #MSG_task_set_flops_amount before restarting the task.
- *
- * Warning: Only work for simple task, not parallel task.
- */
-double MSG_task_get_initial_flops_amount(msg_task_t task) {
- return task->simdata->flops_amount;
-}
-
-/** \ingroup m_task_management
- * \brief set the computation amount needed to process a task #msg_task_t.
- *
- * \warning If the computation is ongoing (already started and not finished),
+ * @warning If the computation is ongoing (already started and not finished),
* it is not modified by this call. Moreover, after its completion, the ongoing execution with set the flops_amount to
* zero, overriding any value set during the execution.
*/
task->simdata->flops_amount = flops_amount;
}
-/** \ingroup m_task_management
- * \brief set the amount data attached with a task #msg_task_t.
+/** @brief set the amount data attached with the given task.
*
- * \warning If the transfer is ongoing (already started and not finished), it is not modified by this call.
+ * @warning If the transfer is ongoing (already started and not finished), it is not modified by this call.
*/
void MSG_task_set_bytes_amount(msg_task_t task, double data_size)
{
task->simdata->bytes_amount = data_size;
}
-/** \ingroup m_task_management
- * \brief Returns the total amount received by a task #msg_task_t.
- * If the communication does not exist it will return 0.
- * So, if the communication has FINISHED or FAILED it returns zero.
+/** @brief Returns the total amount received by the given task
+ *
+ * If the communication does not exist it will return 0.
+ * So, if the communication has FINISHED or FAILED it returns zero.
*/
double MSG_task_get_remaining_communication(msg_task_t task)
{
return task->simdata->comm->remains();
}
-/** \ingroup m_task_management
- * \brief Returns the size of the data attached to a task #msg_task_t.
- */
+/** @brief Returns the size of the data attached to the given task. */
double MSG_task_get_bytes_amount(msg_task_t task)
{
xbt_assert((task != nullptr) && (task->simdata != nullptr), "Invalid parameter");
return task->simdata->bytes_amount;
}
-/** \ingroup m_task_management
- * \brief Changes the priority of a computation task. This priority doesn't affect the transfer rate. A priority of 2
- * will make a task receive two times more cpu power than the other ones.
+/** @brief Changes the priority of a computation task.
+ *
+ * This priority doesn't affect the transfer rate. A priority of 2
+ * will make a task receive two times more cpu power than regular tasks.
*/
void MSG_task_set_priority(msg_task_t task, double priority)
{
simcall_execution_set_priority(task->simdata->compute, task->simdata->priority);
}
-/** \ingroup m_task_management
- * \brief Changes the maximum CPU utilization of a computation task.
- * Unit is flops/s.
+/** @brief Changes the maximum CPU utilization of a computation task (in flops/s).
*
* For VMs, there is a pitfall. Please see MSG_vm_set_bound().
*/
if (task->simdata->compute)
simcall_execution_set_bound(task->simdata->compute, task->simdata->bound);
}
-}
