1 /* Copyright (c) 2004-2022. The SimGrid Team. All rights reserved. */
3 /* This program is free software; you can redistribute it and/or modify it
4 * under the terms of the license (GNU LGPL) which comes with this package. */
6 #include "msg_private.hpp"
7 #include "src/instr/instr_private.hpp"
8 #include <simgrid/s4u/Comm.hpp>
9 #include <simgrid/s4u/Exec.hpp>
10 #include <simgrid/s4u/Host.hpp>
11 #include <simgrid/s4u/Mailbox.hpp>
16 XBT_LOG_NEW_DEFAULT_SUBCATEGORY(msg_task, msg, "Logging specific to MSG (task)");
20 template class xbt::Extendable<msg::Task>;
24 Task::Task(const std::string& name, double flops_amount, double bytes_amount, void* data)
25 : name_(name), flops_amount(flops_amount), bytes_amount(bytes_amount)
27 static std::atomic_ullong counter{0};
30 MC_ignore_heap(&id_, sizeof id_);
33 Task::Task(const std::string& name, std::vector<s4u::Host*>&& hosts, std::vector<double>&& flops_amount,
34 std::vector<double>&& bytes_amount, void* data)
35 : Task(name, 1.0, 0, data)
38 hosts_ = std::move(hosts);
39 flops_parallel_amount = std::move(flops_amount);
40 bytes_parallel_amount = std::move(bytes_amount);
43 Task* Task::create(const std::string& name, double flops_amount, double bytes_amount, void* data)
45 return new Task(name, flops_amount, bytes_amount, data);
48 Task* Task::create_parallel(const std::string& name, int host_nb, const msg_host_t* host_list, double* flops_amount,
49 double* bytes_amount, void* data)
51 std::vector<s4u::Host*> hosts(host_list, host_list + host_nb);
52 std::vector<double> flops;
53 std::vector<double> bytes;
54 if (flops_amount != nullptr)
55 flops = std::vector<double>(flops_amount, flops_amount + host_nb);
56 if (bytes_amount != nullptr)
57 bytes = std::vector<double>(bytes_amount, bytes_amount + host_nb * host_nb);
59 return new Task(name, std::move(hosts), std::move(flops), std::move(bytes), data);
62 msg_error_t Task::execute()
64 /* checking for infinite values */
65 xbt_assert(std::isfinite(flops_amount), "flops_amount is not finite!");
67 msg_error_t status = MSG_OK;
68 if (flops_amount <= 0.0)
74 compute = s4u::this_actor::exec_init(hosts_, flops_parallel_amount, bytes_parallel_amount);
76 compute = s4u::this_actor::exec_init(flops_amount);
78 compute->set_name(name_)
79 ->set_tracing_category(tracing_category_)
80 ->set_priority(1 / priority_)
85 XBT_DEBUG("Execution task '%s' finished", get_cname());
86 } catch (const HostFailureException&) {
87 status = MSG_HOST_FAILURE;
88 } catch (const TimeoutException&) {
90 } catch (const CancelException&) {
91 status = MSG_TASK_CANCELED;
94 /* action ended, set comm and compute = nullptr, the actions is already destroyed in the main function */
102 s4u::CommPtr Task::send_async(const std::string& alias, void_f_pvoid_t cleanup, bool detached)
104 if (TRACE_actor_is_enabled()) {
105 auto* process_container = instr::Container::by_name(instr_pid(*MSG_process_self()));
106 std::string key = "p" + std::to_string(get_id());
107 instr::Container::get_root()->get_link("ACTOR_LINK")->start_event(process_container, "SR", key);
110 /* Prepare the task to send */
112 this->comm = nullptr;
113 msg_global->sent_msg++;
115 s4u::CommPtr s4u_comm = s4u::Mailbox::by_name(alias)->put_init(this, bytes_amount)->set_rate(get_rate());
116 if (TRACE_is_enabled() && has_tracing_category())
117 s4u_comm->set_tracing_category(tracing_category_);
122 comm->detach(cleanup);
129 msg_error_t Task::send(const std::string& alias, double timeout)
131 msg_error_t ret = MSG_OK;
134 comm = nullptr; // needed, otherwise MC gets confused.
135 s4u::CommPtr s4u_comm = send_async(alias, nullptr, false);
137 comm->wait_for(timeout);
138 } catch (const TimeoutException&) {
140 } catch (const CancelException&) {
141 ret = MSG_HOST_FAILURE;
142 } catch (const NetworkFailureException&) {
143 ret = MSG_TRANSFER_FAILURE;
144 /* If the send failed, it is not used anymore */
160 void Task::set_priority(double priority)
162 xbt_assert(std::isfinite(1.0 / priority), "priority is not finite!");
163 priority_ = 1.0 / priority;
166 s4u::Actor* Task::get_sender() const
168 return comm ? comm->get_sender() : nullptr;
171 s4u::Host* Task::get_source() const
173 return comm ? comm->get_sender()->get_host() : nullptr;
176 void Task::set_used()
179 report_multiple_use();
183 void Task::report_multiple_use() const
185 if (MSG_Global_t::debug_multiple_use) {
186 XBT_ERROR("This task is already used in there:");
188 XBT_ERROR("<missing backtrace>");
189 XBT_ERROR("And you try to reuse it from here:");
190 xbt_backtrace_display_current();
192 xbt_die("This task is still being used somewhere else. You cannot send it now. Go fix your code!"
193 "(use --cfg=msg/debug-multiple-use:on to get the backtrace of the other process)");
197 } // namespace simgrid
199 /********************************* Task **************************************/
200 /** @brief Creates a new task
202 * A constructor for msg_task_t taking four arguments.
204 * @param name a name for the object. It is for user-level information and can be nullptr.
205 * @param flop_amount a value of the processing amount (in flop) needed to process this new task.
206 * If 0, then it cannot be executed with MSG_task_execute(). This value has to be >=0.
207 * @param message_size a value of the amount of data (in bytes) needed to transfer this new task. If 0, then it cannot
208 * be transferred with MSG_task_send() and MSG_task_recv(). This value has to be >=0.
209 * @param data a pointer to any data may want to attach to the new object. It is for user-level information and can
210 * be nullptr. It can be retrieved with the function MSG_task_get_data().
211 * @return The new corresponding object.
213 msg_task_t MSG_task_create(const char *name, double flop_amount, double message_size, void *data)
215 return simgrid::msg::Task::create(name ? name : "", flop_amount, message_size, data);
218 /** @brief Creates a new parallel task
220 * A constructor for #msg_task_t taking six arguments.
223 * See :ref:`simgrid::s4u::this_actor::parallel_execute() <API_s4u_parallel_execute>` for
224 * the exact semantic of the parameters.
227 * @param name a name for the object. It is for user-level information and can be nullptr.
228 * @param host_nb the number of hosts implied in the parallel task.
229 * @param host_list an array of @p host_nb msg_host_t.
230 * @param flops_amount an array of @p host_nb doubles.
231 * flops_amount[i] is the total number of operations that have to be performed on host_list[i].
232 * @param bytes_amount an array of @p host_nb* @p host_nb doubles.
233 * @param data a pointer to any data may want to attach to the new object.
234 * It is for user-level information and can be nullptr.
235 * It can be retrieved with the function MSG_task_get_data().
237 msg_task_t MSG_parallel_task_create(const char *name, int host_nb, const msg_host_t * host_list,
238 double *flops_amount, double *bytes_amount, void *data)
240 // Task's flops amount is set to an arbitrary value > 0.0 to be able to distinguish, in
241 // MSG_task_get_remaining_work_ratio(), a finished task and a task that has not started yet.
242 return simgrid::msg::Task::create_parallel(name ? name : "", host_nb, host_list, flops_amount, bytes_amount, data);
245 /** @brief Return the user data of the given task */
246 void* MSG_task_get_data(const_msg_task_t task)
248 return task->get_data<void>();
251 /** @brief Sets the user data of a given task */
252 void MSG_task_set_data(msg_task_t task, void *data)
254 task->set_data(data);
257 /** @brief Returns the sender of the given task */
258 msg_process_t MSG_task_get_sender(const_msg_task_t task)
260 return task->get_sender();
263 /** @brief Returns the source (the sender's host) of the given task */
264 msg_host_t MSG_task_get_source(const_msg_task_t task)
266 return task->get_source();
269 /** @brief Returns the name of the given task. */
270 const char* MSG_task_get_name(const_msg_task_t task)
272 return task->get_cname();
275 /** @brief Sets the name of the given task. */
276 void MSG_task_set_name(msg_task_t task, const char *name)
278 task->set_name(name);
282 * @brief Executes a task and waits for its termination.
284 * This function is used for describing the behavior of a process. It takes only one parameter.
285 * @param task a #msg_task_t to execute on the location on which the process is running.
286 * @return #MSG_OK if the task was successfully completed, #MSG_TASK_CANCELED or #MSG_HOST_FAILURE otherwise
288 msg_error_t MSG_task_execute(msg_task_t task)
290 return task->execute();
294 * @brief Executes a parallel task and waits for its termination.
296 * @param task a #msg_task_t to execute on the location on which the process is running.
298 * @return #MSG_OK if the task was successfully completed, #MSG_TASK_CANCELED or #MSG_HOST_FAILURE otherwise
300 msg_error_t MSG_parallel_task_execute(msg_task_t task)
302 return task->execute();
305 msg_error_t MSG_parallel_task_execute_with_timeout(msg_task_t task, double timeout)
307 task->set_timeout(timeout);
308 return task->execute();
312 * @brief Sends a task on a mailbox.
314 * This is a non blocking function: use MSG_comm_wait() or MSG_comm_test() to end the communication.
316 * @param task a #msg_task_t to send on another location.
317 * @param alias name of the mailbox to sent the task to
318 * @return the msg_comm_t communication created
320 msg_comm_t MSG_task_isend(msg_task_t task, const char* alias)
322 return new simgrid::msg::Comm(task, nullptr, task->send_async(alias, nullptr, false));
326 * @brief Sends a task on a mailbox with a maximum rate
328 * This is a non blocking function: use MSG_comm_wait() or MSG_comm_test() to end the communication. The maxrate
329 * parameter allows the application to limit the bandwidth utilization of network links when sending the task.
331 * @param task a #msg_task_t to send on another location.
332 * @param alias name of the mailbox to sent the task to
333 * @param maxrate the maximum communication rate for sending this task (byte/sec).
334 * @return the msg_comm_t communication created
336 msg_comm_t MSG_task_isend_bounded(msg_task_t task, const char* alias, double maxrate)
338 task->set_rate(maxrate);
339 return new simgrid::msg::Comm(task, nullptr, task->send_async(alias, nullptr, false));
343 * @brief Sends a task on a mailbox.
345 * This is a non blocking detached send function.
346 * Think of it as a best effort send. Keep in mind that the third parameter is only called if the communication fails.
347 * If the communication does work, it is responsibility of the receiver code to free anything related to the task, as
348 * usual. More details on this can be obtained on
349 * <a href="http://lists.gforge.inria.fr/pipermail/simgrid-user/2011-November/002649.html">this thread</a>
350 * in the SimGrid-user mailing list archive.
352 * @param task a #msg_task_t to send on another location.
353 * @param alias name of the mailbox to sent the task to
354 * @param cleanup a function to destroy the task if the communication fails, e.g. MSG_task_destroy
355 * (if nullptr, no function will be called)
357 void MSG_task_dsend(msg_task_t task, const char* alias, void_f_pvoid_t cleanup)
359 task->send_async(alias, cleanup, true);
363 * @brief Sends a task on a mailbox with a maximal rate.
365 * This is a non blocking detached send function.
366 * Think of it as a best effort send. Keep in mind that the third parameter is only called if the communication fails.
367 * If the communication does work, it is responsibility of the receiver code to free anything related to the task, as
368 * usual. More details on this can be obtained on
369 * <a href="http://lists.gforge.inria.fr/pipermail/simgrid-user/2011-November/002649.html">this thread</a>
370 * in the SimGrid-user mailing list archive.
372 * The rate parameter can be used to send a task with a limited bandwidth (smaller than the physical available value).
373 * Use MSG_task_dsend() if you don't limit the rate (or pass -1 as a rate value do disable this feature).
375 * @param task a #msg_task_t to send on another location.
376 * @param alias name of the mailbox to sent the task to
377 * @param cleanup a function to destroy the task if the communication fails, e.g. MSG_task_destroy (if nullptr, no
378 * function will be called)
379 * @param maxrate the maximum communication rate for sending this task (byte/sec)
382 void MSG_task_dsend_bounded(msg_task_t task, const char* alias, void_f_pvoid_t cleanup, double maxrate)
384 task->set_rate(maxrate);
385 task->send_async(alias, cleanup, true);
388 * @brief Sends a task to a mailbox
390 * This is a blocking function, the execution flow will be blocked until the task is sent (and received on the other
391 * side if #MSG_task_receive is used).
392 * See #MSG_task_isend for sending tasks asynchronously.
394 * @param task the task to be sent
395 * @param alias the mailbox name to where the task is sent
397 * @return Returns #MSG_OK if the task was successfully sent,
398 * #MSG_HOST_FAILURE, or #MSG_TRANSFER_FAILURE otherwise.
400 msg_error_t MSG_task_send(msg_task_t task, const char* alias)
402 XBT_DEBUG("MSG_task_send: Trying to send a message on mailbox '%s'", alias);
403 return task->send(alias, -1);
407 * @brief Sends a task to a mailbox with a maximum rate
409 * This is a blocking function, the execution flow will be blocked until the task is sent. The maxrate parameter allows
410 * the application to limit the bandwidth utilization of network links when sending the task.
412 * The maxrate parameter can be used to send a task with a limited bandwidth (smaller than the physical available
413 * value). Use MSG_task_send() if you don't limit the rate (or pass -1 as a rate value do disable this feature).
415 * @param task the task to be sent
416 * @param alias the mailbox name to where the task is sent
417 * @param maxrate the maximum communication rate for sending this task (byte/sec)
419 * @return Returns #MSG_OK if the task was successfully sent,
420 * #MSG_HOST_FAILURE, or #MSG_TRANSFER_FAILURE otherwise.
422 msg_error_t MSG_task_send_bounded(msg_task_t task, const char* alias, double maxrate)
424 task->set_rate(maxrate);
425 return task->send(alias, -1);
429 * @brief Sends a task to a mailbox with a timeout
431 * This is a blocking function, the execution flow will be blocked until the task is sent or the timeout is achieved.
433 * @param task the task to be sent
434 * @param alias the mailbox name to where the task is sent
435 * @param timeout is the maximum wait time for completion (if -1, this call is the same as #MSG_task_send)
437 * @return Returns #MSG_OK if the task was successfully sent,
438 * #MSG_HOST_FAILURE, or #MSG_TRANSFER_FAILURE, or #MSG_TIMEOUT otherwise.
440 msg_error_t MSG_task_send_with_timeout(msg_task_t task, const char* alias, double timeout)
442 return task->send(alias, timeout);
446 * @brief Sends a task to a mailbox with a timeout and with a maximum rate
448 * This is a blocking function, the execution flow will be blocked until the task is sent or the timeout is achieved.
450 * The maxrate parameter can be used to send a task with a limited bandwidth (smaller than the physical available
451 * value). Use MSG_task_send_with_timeout() if you don't limit the rate (or pass -1 as a rate value do disable this
454 * @param task the task to be sent
455 * @param alias the mailbox name to where the task is sent
456 * @param timeout is the maximum wait time for completion (if -1, this call is the same as #MSG_task_send)
457 * @param maxrate the maximum communication rate for sending this task (byte/sec)
459 * @return Returns #MSG_OK if the task was successfully sent,
460 * #MSG_HOST_FAILURE, or #MSG_TRANSFER_FAILURE, or #MSG_TIMEOUT otherwise.
462 msg_error_t MSG_task_send_with_timeout_bounded(msg_task_t task, const char* alias, double timeout, double maxrate)
464 task->set_rate(maxrate);
465 return task->send(alias, timeout);
469 * @brief Receives a task from a mailbox.
471 * This is a blocking function, the execution flow will be blocked until the task is received. See #MSG_task_irecv
472 * for receiving tasks asynchronously.
474 * @param task a memory location for storing a #msg_task_t.
475 * @param alias name of the mailbox to receive the task from
478 * #MSG_OK if the task was successfully received,
479 * #MSG_HOST_FAILURE, or #MSG_TRANSFER_FAILURE otherwise.
481 msg_error_t MSG_task_receive(msg_task_t * task, const char *alias)
483 return MSG_task_receive_with_timeout(task, alias, -1);
487 * @brief Receives a task from a mailbox at a given rate.
489 * @param task a memory location for storing a #msg_task_t.
490 * @param alias name of the mailbox to receive the task from
491 * @param rate limit the reception to rate bandwidth (byte/sec)
493 * The rate parameter can be used to receive a task with a limited bandwidth (smaller than the physical available
494 * value). Use MSG_task_receive() if you don't limit the rate (or pass -1 as a rate value do disable this feature).
497 * #MSG_OK if the task was successfully received,
498 * #MSG_HOST_FAILURE, or #MSG_TRANSFER_FAILURE otherwise.
500 msg_error_t MSG_task_receive_bounded(msg_task_t* task, const char* alias, double rate)
502 return MSG_task_receive_with_timeout_bounded(task, alias, -1, rate);
506 * @brief Receives a task from a mailbox with a given timeout.
508 * This is a blocking function with a timeout, the execution flow will be blocked until the task is received or the
509 * timeout is achieved. See #MSG_task_irecv for receiving tasks asynchronously. You can provide a -1 timeout
510 * to obtain an infinite timeout.
512 * @param task a memory location for storing a #msg_task_t.
513 * @param alias name of the mailbox to receive the task from
514 * @param timeout is the maximum wait time for completion (if -1, this call is the same as #MSG_task_receive)
517 * #MSG_OK if the task was successfully received,
518 * #MSG_HOST_FAILURE, or #MSG_TRANSFER_FAILURE, or #MSG_TIMEOUT otherwise.
520 msg_error_t MSG_task_receive_with_timeout(msg_task_t* task, const char* alias, double timeout)
522 return MSG_task_receive_with_timeout_bounded(task, alias, timeout, -1);
526 * @brief Receives a task from a mailbox with a given timeout and at a given rate.
528 * @param task a memory location for storing a #msg_task_t.
529 * @param alias name of the mailbox to receive the task from
530 * @param timeout is the maximum wait time for completion (if -1, this call is the same as #MSG_task_receive)
531 * @param rate limit the reception to rate bandwidth (byte/sec)
533 * The rate parameter can be used to send a task with a limited
534 * bandwidth (smaller than the physical available value). Use
535 * MSG_task_receive() if you don't limit the rate (or pass -1 as a
536 * rate value do disable this feature).
539 * #MSG_OK if the task was successfully received,
540 * #MSG_HOST_FAILURE, or #MSG_TRANSFER_FAILURE, or #MSG_TIMEOUT otherwise.
542 msg_error_t MSG_task_receive_with_timeout_bounded(msg_task_t* task, const char* alias, double timeout, double rate)
544 XBT_DEBUG("MSG_task_receive_with_timeout_bounded: Trying to receive a message on mailbox '%s'", alias);
545 msg_error_t ret = MSG_OK;
548 xbt_assert(task, "Null pointer for the task storage");
551 XBT_WARN("Asked to write the received task in a non empty struct -- proceeding.");
553 /* Try to receive it by calling SIMIX network layer */
556 simgrid::s4u::Mailbox::by_name(alias)
558 ->set_dst_data(&payload, sizeof(msg_task_t*))
561 *task = static_cast<msg_task_t>(payload);
562 XBT_DEBUG("Got task %s from %s", (*task)->get_cname(), alias);
563 (*task)->set_not_used();
564 } catch (const simgrid::HostFailureException&) {
565 ret = MSG_HOST_FAILURE;
566 } catch (const simgrid::TimeoutException&) {
568 } catch (const simgrid::CancelException&) {
569 ret = MSG_TASK_CANCELED;
570 } catch (const simgrid::NetworkFailureException&) {
571 ret = MSG_TRANSFER_FAILURE;
574 if (TRACE_actor_is_enabled() && ret != MSG_HOST_FAILURE && ret != MSG_TRANSFER_FAILURE && ret != MSG_TIMEOUT) {
575 auto* process_container = simgrid::instr::Container::by_name(instr_pid(*MSG_process_self()));
577 std::string key = "p" + std::to_string((*task)->get_id());
578 simgrid::instr::Container::get_root()->get_link("ACTOR_LINK")->end_event(process_container, "SR", key);
584 * @brief Starts listening for receiving a task from an asynchronous communication.
586 * This is a non blocking function: use MSG_comm_wait() or MSG_comm_test() to end the communication.
588 * @param task a memory location for storing a #msg_task_t. has to be valid until the end of the communication.
589 * @param name of the mailbox to receive the task on
590 * @return the msg_comm_t communication created
592 msg_comm_t MSG_task_irecv(msg_task_t* task, const char* name)
594 return MSG_task_irecv_bounded(task, name, -1.0);
598 * @brief Starts listening for receiving a task from an asynchronous communication at a given rate.
600 * The rate parameter can be used to receive a task with a limited
601 * bandwidth (smaller than the physical available value). Use
602 * MSG_task_irecv() if you don't limit the rate (or pass -1 as a rate
603 * value do disable this feature).
605 * @param task a memory location for storing a #msg_task_t. has to be valid until the end of the communication.
606 * @param name of the mailbox to receive the task on
607 * @param rate limit the bandwidth to the given rate (byte/sec)
608 * @return the msg_comm_t communication created
610 msg_comm_t MSG_task_irecv_bounded(msg_task_t* task, const char* name, double rate)
612 /* FIXME: these functions are not traceable */
614 xbt_assert(task, "Null pointer for the task storage");
617 XBT_CRITICAL("MSG_task_irecv() was asked to write in a non empty task struct.");
619 /* Try to receive it by calling SIMIX network layer */
620 simgrid::s4u::CommPtr comm = simgrid::s4u::Mailbox::by_name(name)
622 ->set_dst_data((void**)task, sizeof(msg_task_t*))
626 return new simgrid::msg::Comm(nullptr, task, comm);
630 * @brief Look if there is a communication on a mailbox and return the PID of the sender process.
632 * @param alias the name of the mailbox to be considered
634 * @return Returns the PID of sender process (or -1 if there is no communication in the mailbox)
637 int MSG_task_listen_from(const char* alias)
639 return simgrid::s4u::Mailbox::by_name(alias)->listen_from();
642 /** @brief Destroys the given task.
644 * You should free user data, if any, @b before calling this destructor.
646 * Only the process that owns the task can destroy it.
647 * The owner changes after a successful send.
648 * If a task is successfully sent, the receiver becomes the owner and is supposed to destroy it. The sender should not
650 * If the task failed to be sent, the sender remains the owner of the task.
652 msg_error_t MSG_task_destroy(msg_task_t task)
654 if (task->is_used()) {
655 /* the task is being sent or executed: cancel it first */
659 /* free main structures */
665 /** @brief Cancel the given task
667 * If it was currently executed or transferred, the working process is stopped.
669 msg_error_t MSG_task_cancel(msg_task_t task)
671 xbt_assert((task != nullptr), "Cannot cancel a nullptr task");
676 /** @brief Returns a value in ]0,1[ that represent the task remaining work
677 * to do: starts at 1 and goes to 0. Returns 0 if not started or finished.
679 * It works for either parallel or sequential tasks.
681 double MSG_task_get_remaining_work_ratio(const_msg_task_t task)
683 xbt_assert((task != nullptr), "Cannot get information from a nullptr task");
686 return task->compute->get_remaining_ratio();
688 // Task not started (flops_amount is > 0.0) or finished (flops_amount is set to 0.0)
689 return task->flops_amount > 0.0 ? 1.0 : 0.0;
693 /** @brief Returns the amount of flops that remain to be computed
695 * The returned value is initially the cost that you defined for the task, then it decreases until it reaches 0
697 * It works for sequential tasks, but the remaining amount of work is not a scalar value for parallel tasks.
698 * So you will get an exception if you call this function on parallel tasks. Just don't do it.
700 double MSG_task_get_flops_amount(const_msg_task_t task)
702 if (task->compute != nullptr && task->compute->get_state() == simgrid::s4u::Activity::State::STARTED) {
703 return task->compute->get_remaining();
705 // Not started or already done.
706 // - Before starting, flops_amount is initially the task cost
707 // - After execution, flops_amount is set to 0 (until someone uses MSG_task_set_flops_amount, if any)
708 return task->flops_amount;
712 /** @brief set the computation amount needed to process the given task.
714 * @warning If the computation is ongoing (already started and not finished),
715 * it is not modified by this call. Moreover, after its completion, the ongoing execution with set the flops_amount to
716 * zero, overriding any value set during the execution.
718 void MSG_task_set_flops_amount(msg_task_t task, double flops_amount)
720 task->flops_amount = flops_amount;
723 /** @brief set the amount data attached with the given task.
725 * @warning If the transfer is ongoing (already started and not finished), it is not modified by this call.
727 void MSG_task_set_bytes_amount(msg_task_t task, double data_size)
729 task->bytes_amount = data_size;
732 /** @brief Returns the total amount received by the given task
734 * If the communication does not exist it will return 0.
735 * So, if the communication has FINISHED or FAILED it returns zero.
737 double MSG_task_get_remaining_communication(const_msg_task_t task)
739 XBT_DEBUG("calling s4u::Comm::get_remaining (%p)", task->comm.get());
740 return task->comm->get_remaining();
743 /** @brief Returns the size of the data attached to the given task. */
744 double MSG_task_get_bytes_amount(const_msg_task_t task)
746 xbt_assert(task != nullptr, "Invalid parameter");
747 return task->bytes_amount;
750 /** @brief Changes the priority of a computation task.
752 * This priority doesn't affect the transfer rate. A priority of 2
753 * will make a task receive two times more cpu power than regular tasks.
755 void MSG_task_set_priority(msg_task_t task, double priority)
757 task->set_priority(priority);
760 /** @brief Changes the maximum CPU utilization of a computation task (in flops/s).
762 * For VMs, there is a pitfall. Please see MSG_vm_set_bound().
764 void MSG_task_set_bound(msg_task_t task, double bound)
766 if (bound < 1e-12) /* close enough to 0 without any floating precision surprise */
767 XBT_INFO("bound == 0 means no capping (i.e., unlimited).");
768 task->set_bound(bound);
772 * @brief Sets the tracing category of a task.
774 * This function should be called after the creation of a MSG task, to define the category of that task. The
775 * first parameter task must contain a task that was =created with the function MSG_task_create(). The second
776 * parameter category must contain a category that was previously declared with the function #TRACE_category
777 * (or with #TRACE_category_with_color).
780 * See :ref:`outcome_vizu` for details on how to trace the (categorized) resource utilization.
783 * @param task the task that is going to be categorized
784 * @param category the name of the category to be associated to the task
786 void MSG_task_set_category(msg_task_t task, const char* category)
788 xbt_assert(not task->has_tracing_category(), "Task %p(%s) already has a category (%s).", task, task->get_cname(),
789 task->get_tracing_category().c_str());
791 // if user provides a nullptr category, task is no longer traced
792 if (category == nullptr) {
793 task->set_tracing_category("");
794 XBT_DEBUG("MSG task %p(%s), category removed", task, task->get_cname());
797 task->set_tracing_category(category);
798 XBT_DEBUG("MSG task %p(%s), category %s", task, task->get_cname(), task->get_tracing_category().c_str());
803 * @brief Gets the current tracing category of a task. (@see MSG_task_set_category)
804 * @param task the task to be considered
805 * @return Returns the name of the tracing category of the given task, "" otherwise
807 const char* MSG_task_get_category(const_msg_task_t task)
809 return task->get_tracing_category().c_str();